Patent Publication Number: US-2023151708-A1

Title: Single Line Quick Connector (SQC), a System Comprising the Single Line Quick Connector and Method of Operating

Description:
FIELD OF THE INVENTION 
     The present invention relates to a single line quick connector for connecting a fluid line to a fluid connection interface on a subsea or topside component, a system comprising the single line quick connector as well as a method for connecting the single line quick connector to a connection interface on the component to establish a fluid connection between the component and an external fluid line connected to an external pressurized or non-pressurized connection interface on the component. The connection can be connectable to a subsea component or a topside component, and the connection can be a hydraulic connection or other fluid connection such as water or chemical connection for chemical injection. If used topside, it can also be used in a hydrogen connection. 
     The invention also relates to a method of overriding a malfunctioning single line quick connector which is in an engaged position locked to the connection interface on the component in order to release the connector from the engaged relationship with the component. 
     BACKGROUND OF THE INVENTION 
     Production of hydrocarbons (oil and/or gas) from subsea oil/gas wells typically involves positioning several items of production equipment, such as e.g. Christmas trees, manifolds, pipelines, flowline skids, pipeline end terminations (PLETs), etc. on the sea floor. Flowlines or jumpers are normally coupled to these various items of equipment so as to allow the produced hydrocarbons to flow between and among such production equipment with the ultimate objective being to get the produced hydrocarbon fluids to a desired end-point, e.g., a surface vessel or structure, an on-shore storage facility or pipeline, etc. Jumpers may be used to connect the individual wellheads to a central manifold. In other cases, relatively flexible lines may be employed to connect some on the subsea equipment items to one another. 
     A stab is a subsea hydraulic connecting device for hydraulic fluid transmission, for instance between a hydraulic power unit localized topside and a subsea component (e.g., a hydraulically operated tool) localized subsea, for instance on the seafloor. Essentially, a stab is a hydraulic quick-acting coupling designed for subsea conditions. 
     A stab or single line connector connects to a receptacle arranged on the subsea equipment or tool. Usually the connection operation and the corresponding disconnection operation is performed by the use of a Remotely Operated Vehicle (ROV) or a diver. If used topside, a human operator may operate the connection. 
     Some of the single line connectors (SLC) are operated by rotation in order to connect to the stab to the subsea component. One example of such rotational operation is by specific pre-determined sequences of rotation in the clockwise and counterclockwise direction in order to connect and disconnect the stab from the subsea component. 
     There are however drawbacks of the described rotationally-operated single line connectors in situations in the event the connector gets stuck or if the pre-determined sequences of rotation are not performed in correct order which may lead to failure or break of the single line connector. 
     It is therefore a need to address the drawbacks related to the prior art solutions. 
     One of the objectives of the invention is to provide a single line quick connector which is more easily operable and where the risk of user-errors is minimized. 
     Another objective is to provide a single line quick connector with a reliable override function in the event the connector gets stuck or other failure/break occurs. 
     SUMMARY OF INVENTION 
     The invention is set forth in the independent claims, while the dependent claims describe other characteristics of the invention. 
     It is described a single line quick connector for connecting a fluid line to a fluid connection interface on a component, wherein the connector comprises:
         an outer housing comprising a tool interface in one axial end thereof for operation by a tool,   a flow bore for fluid connection with the fluid connection interface on the component,   a screw element which is rotationally movable and axially fixed relative the outer housing, wherein the screw element extends in a longitudinal direction of the connector and comprises external threads along a part of its axial length and further comprises a termination which is operable by the tool,   a collet sleeve which is rotationally fixed and axially movable relative the outer housing, wherein the collet sleeve further comprises internal threads for cooperation with the external threads on the screw element, and wherein the collet sleeve comprises a plurality of collet fingers in a first axial end thereof for connection to the fluid connection interface on the component and,   a fluid line insert comprising a groove for a coupler,       

     wherein the outer housing, the screw element and the collet sleeve are arranged such that:
         a rotation of the screw element in a first direction results in an axial movement of the outer housing relative the collet sleeve, and thus the collet fingers, in a first axial direction, and   a rotation of the screw element in a second direction, opposite of the first rotational direction, results in an axial movement of the outer housing relative the collet sleeve, and thus the collet fingers, in a second direction, which is opposite to the first axial direction,       

     wherein the outer housing comprises a through-going opening and the collet sleeve comprises at least one recess between neighboring collet fingers, wherein the through-going opening and the at least one recess, when connected, are configured to accommodate the fluid line insert, and wherein the fluid line insert is connectable to the fluid line. 
     The single line quick connector provides a fluid connection between fluid line and fluid connection interface on the component. 
     The tool can be operable by a remotely operated vehicle (ROV), manually by a diver, or human operated topside. 
     The termination can be with paddle, square wrench or ROV operable through an API 17H bucket for subsea applications and other tools for topside applications. 
     In one embodiment the connection can be a hydraulic connection topside or subsea, and the fluid line can be a hydraulic fluid line. The coupler can be a hydraulic coupler for hydraulic fluids. 
     In another embodiment the connection can be a water connection topside or subsea, and the fluid line can be a water fluid line. The coupler can be a water coupler for water. 
     In yet another embodiment, the connection can be a chemical fluid connection topside or subsea, and the fluid line can be a chemical fluid line. The coupler can be a chemical coupler for chemical fluids. 
     If used topside, the single line quick connector can also be used in a hydrogen connection. Similarly, the component can be arranged subsea or topside, and may thus be denoted either subsea component or topside component. 
     The fluid line insert can also be denoted a fluid line block insert. 
     The fluid line insert may comprise a through-bore in fluid communication with the flow bore and a connection interface for connection to the fluid line, such that when the fluid line insert is accommodated in the outer housing and the fluid line is connected to the fluid line insert and the coupler is positioned in the flow bore and the fluid line insert, a communication line is formed between the fluid line and the flow bore through the coupler. 
     The outer housing may comprise:
         an inner axial portion with increased diameter for receiving the collet fingers representing an open position of the connector where the collet fingers are disengaged relative the fluid connection interface on the component, and   an inner axial portion with reduced diameter for receiving the collet fingers representing an engaged position of the connector where the collet fingers are locked to the fluid connection interface on the component.       

     In other words, the outer housing may comprise a portion with reduced inner diameter and a portion with increased inner diameter, and wherein the outer housing is movable relative the collet sleeve between a disengaged position of the connector and an engaged position of the connector, wherein:
         in the disengaged position the collet fingers are positioned in a portion of the outer housing with an increased inner diameter, and   in the engaged position the collet fingers are positioned in a portion of the outer housing with a reduced inner diameter.       

     In the engaged position, the collet fingers may snap onto/over the fluid connection interface on the component. 
     As described herein, the setup of the single line quick connector and its engagement and disengagement to the fixed fluid connection interface on the subsea component or topside component, involves that it is the outer housing together with the axially fixed fluid line insert that move relative the fixed fluid connection interface and the collet sleeve. I.e., once the single line quick connector is in correct position relative the fluid connection interface, the collet fingers are at the same axial distance from the fluid connection interface while the radial distance varies depending on whether the collet fingers are engaged with the fluid connection interface or disengaged from the fluid connection interface (depending on whether the collet fingers are located in the inner axial portion with reduced diameter or the inner axial portion with increased diameter of the outer housing). 
     The at least one recess of the collet sleeve may have a longer axial extension than the fluid line insert when accommodated in the at least one recess such that they can move relative each other during connection and disconnection of the single line quick connector to or from the component. 
     The fluid line insert may be configured to be axially fixed relative the outer housing and axially movable relative the collet sleeve, such that fluid line insert is allowed to move together with the outer housing along the at least one recess in the axial direction of the single line quick connector. 
     The collet sleeve may be rotationally locked to the outer housing by axially extending elements or through friction between the outer housing and the collet sleeve. 
     The collet sleeve may further comprise a connection ring for termination of the collet fingers in an opposite second axial end thereof. 
     The connection ring may be secured to the outer housing against rotation by axially extending elements. The axially extending elements may be screws or bolts, or other suitable means providing the required function of securing the connection ring to the outer housing. The connection to the outer housing may be via a fastening plate. The fastening plate may form part of the outer housing and may cover the radial cross section of the single line quick connector. The fastening plate may comprise a center opening for receiving the screw element therethrough and peripheral openings for receiving the axially extending elements. A distance plate with a corresponding center opening and peripheral openings as in the fastening plate may be arranged adjacent the fastening plate between the fastening plate and the collet sleeve. A contra nut may be fixedly connected to the distance plate and serves as a lock for the screw element when in an end position such that the screw element can “lift” the single line quick connector when disconnecting/releasing from the component. The axially extending elements may be secured to the outer housing through fastening holes. The collet sleeve, fastening plate and distance plate are preferably rotationally locked to the outer housing by the axially extending elements running through the peripheral openings in the fastening plate and distance plate, respectively, and through peripheral axial bores of the connection ring. However, the outer housing and fastening plate is axially movable relative the collet sleeve and the distance plate which facilitate that a rotation of the screw element results in an axial movement of the outer housing relative the collet sleeve. 
     The single line quick connector may comprise a hub rotatably locked to the outer housing such that when the hub is rotated the outer housing is rotated. This provides a single line quick connector with a uni-directional connection/engagement to the fluid connection interface on the component. This is an advantage in situations where one needs to account for size and position of pre-installed equipment in that one can orient the single line quick connector during connection to a position where collision and possible damage to equipment is minimized. Furthermore, when connecting/engaging the single line quick connector one may account for the orientation of the fluid line to be connected to the single line quick connector which also reduces risk of complications during connection of the fluid line. 
     It is further described a fluid line insert for accommodation in a through-going opening in an outer housing of a single line quick connector as described above, the fluid line insert comprising:
         a groove for receiving a hydraulic coupler,   an external connection interface for connection to an external fluid line,   a through-bore extending from the groove for the coupler to the external connection interface.       

     The fluid line insert may comprise a hole for receiving fastening means connecting the fluid line insert to an inner surface of the outer housing radially opposite the through-going opening of the outer housing such that the fluid line insert is axially and rotationally fixed to the outer housing. 
     It is further described a system comprising a single line quick connector as described above and a fluid line insert as described above. 
     The system may further comprise a fluid line connected to the external connection interface. The system may further comprise the component with the fluid connection interface. 
     It is further described a method of engaging a single line quick connector as described above to a fluid connection interface on a component, wherein the method comprises the steps of:
         radially positioning the fluid line insert into the through-going opening of the outer housing and the at least one recess of the collet sleeve,   positioning a coupler inside the flow bore and the groove of the fluid line insert,   providing the connector with the collet fingers in a disengaged position,   moving the connector relative the fluid connection interface into a position where the collet fingers snap onto or over the fluid connection interface,   rotating the screw element in a first direction resulting in an axial movement of the outer housing relative the collet sleeve, and thus the collet fingers, to an engaged position where the collet fingers lock around the fluid connection interface,   connecting a fluid line to the fluid line insert.       

     Additionally, one may, prior to rotating the screw element, rotate the connection interface for correct orientation of the fluid line relative the single line quick connector and other lines, pipes, components that may be present in proximity of where the connection is to be made. 
     Disengagement of the single line quick connector from the fluid connection interface may comprise the steps of:
         rotating the screw element in a second direction, opposite of the first rotational direction, resulting in an axial movement of the outer housing relative the collet sleeve, and thus the collet fingers, to a disengaged position where the collet fingers unlock from the fluid connection interface.       

     It is further described a method of overriding a malfunctioning single line quick connector as described above, which connector is in an engaged position locked to the fluid connection interface on the component, wherein the method comprises the steps of:
         providing a milling tool on a tool,   utilizing said milling tool to mill an annular groove around the screw element at least over a distance equal to a travel distance of the collet sleeve thereby loosening the axially fixed relationship of the screw element relative the outer housing,   utilizing a pushing tool to axially move the outer housing relative the screw element and the collet sleeve to the disengaged position.       

     The step of milling an annular groove may comprise milling through the fastening plate and any distance plate. The axial milling distance being at least equal to a travel distance of the collet sleeve. The milling resulting in loosening the axially fixed relationship of the screw element relative the outer housing (via the fastening plate). 
     Summarized, the invention described herein may have at least some of the following main benefits or advantages:
         Reduced risk of user-errors by being easy to operate in that the threads are preferably in “standard”, i.e. “clockwise rotation” (rotation to the right) connects the single line quick connector to the component while “counter-clockwise rotation” disconnects the connector from the component.   Uni-directional connection to the fluid connection interface on the component.   Less risk of issues due to calcareous deposits.   A reliable override functionality in case the single line quick connector gets stuck (overgrown, threads get worn etc.) and cannot be removed using standard disconnecting procedure.   Standard interface towards ROV. No need to tailor ROV for operating the single line quick connector.   Standard interface towards already installed subsea component(s). No need to tailor interface on already installed subsea component or equipment.   No welding compared to prior art solutions.       

     These and other embodiments of the present invention will be apparent from the attached drawings, where: 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS.  1 A- 1 E  show different views and cross-sections of an example of a subsea component which is attached to a fixed structure with a fluid connection interface on to which a single line quick connector according to the present invention can be connected; 
         FIG.  1 F  shows an example of a single line quick connector with a J-slot for connection to the connection interface of  FIGS.  1 A- 1 E ; 
         FIG.  1 G  shows setup with a vessel floating on surface of water with a Remotely Operated Vehicle (ROV) connected to the vessel for establishing a hydraulic connection between the vessel and the subsea component arranged at seabed via the fluid connection interface on the subsea component; 
         FIGS.  2 A- 2 D  show different views of an exemplary single line quick connector according to the present invention with a hydraulic fluid line connected thereto; 
         FIGS.  3 A- 3 E  are different cross-sectional views of a single line quick connector according to the invention, where  FIG.  3 A  is top view along an axis extending through the single line quick connector seen from the ROV connection end of the connector,  FIG.  3 B  is a side view of the single line quick connector,  FIG.  3 C  is a view along section A-A in  FIG.  3 A ,  FIG.  3 D  is a view along section B-B in  FIG.  3 C  and  FIG.  3 E  is a view along section C-C in  FIG.  3 B ; 
         FIG.  4 A  is an exploded view of a single line quick connector according to the invention, and  FIG.  4 B  is an enlarged view of the fluid line block insert in detail D in  FIG.  4 A ; 
         FIG.  5    shows the collet fingers of the single line quick connector engaged with a fluid connection interface of a subsea component; 
         FIGS.  6 A and  6 B  show details of a hydraulic coupler and a protective cap of a single line quick connector according to the invention in two different side views; 
     
    
    
     DETAILED DESCRIPTION OF A PREFERENTIAL FORM OF EMBODIMENT 
     In the following, embodiments of the invention will be discussed in more detail with reference to the appended drawings. It should be understood, however, that the drawings are not intended to limit the invention to the subject-matter depicted in the drawings. Furthermore, even though some of the features are described in relation to the single line quick connector only, it is apparent that they are valid for the related method as well, and vice versa. Hence, any features described in relation to the method are also valid for the single line quick connector  10 . 
     Furthermore, the single line quick connector  10  will now be described in relation to connection to a subsea component  1  using ROV  3 , however, instead of ROV  3 , a diver  45  may operate the single line quick connector  10  at shallower depths. In addition, although not explicitly disclosed in the following Figures, the single line quick connector  10  may be used topside where it is operated by a human operator, such topside use of the single line quick connector will be apparent for the skilled person when reading the following disclosure. 
       FIGS.  1 A- 1 E  show different views and cross-sections of an example of a subsea component with a fluid connection interface  2  on to which a single line quick connector according to the present invention can be connected. In particular,  FIG.  1 A  is a side view,  FIG.  1 B  is a top view along a centre axis of the fluid connection interface  2 ,  FIG.  1   . C is a cross section view along section A-A of  FIG.  1 A ,  FIG.  1 D  is a perspective side view, while  FIG.  1 E  is an exploded view of  FIG.  1 D . The fluid connection interface  2  on the subsea component  1  has a circular cross-section with varying outer diameter along its center axis, i.e. it has a portion with relatively larger outer diameter in a distal end followed by a portion with a relatively smaller diameter such that the single line quick connector according to the invention can snap onto/over the fluid connection interface  2  on the subsea component  1 . The subsea component  2  is disclosed with a guide portion  8  for aligning the single line quick connector in line with, and onto, the fluid connection interface  2 . 
       FIG.  1 F  shows an example of a single line connector with a J-slot for connection to the connection interface of  FIGS.  1 A- 1 E . The single line connector to the left in  FIG.  1 F  is the outboard part in the form of a ROV with a so-called paddle interface/handle, which does not have an override function in case of user-error or jamming. The Figure to the right is an example of an inboard connector on the component the single line quick connector shall connect. 
       FIG.  1 G  shows setup with a vessel  5  floating on surface of water  6  with a Remotely Operated Vehicle (ROV)  3  connected to the vessel  5  for establishing a hydraulic connection between the vessel  5  and the subsea component  1  arranged at seabed  7  via the fluid connection interface  2  on the subsea component  1  or internal connection between two subsea components  1 . Alternatively, instead of an ROV  3 , a diver  45  can perform the connection (on relatively shallower depths). However, although not shown, and as indicated above, the single line quick connector can be connected to a component  1  arranged topside and a human operator may perform the connection in “dry” environment, i.e. in air instead of subsea. 
       FIGS.  2 A- 2 D  show different views of an exemplary single line quick connector according to the present invention with a hydraulic fluid line  20  connected to a radial connection interface  27  for the hydraulic fluid line  20  on the single line quick connector  10 . The single line quick connector comprises a ROV interface  12  for operation by a ROV (ROV not shown in  FIGS.  2 A- 2 D , see  FIG.  1 G ). In  FIG.  2 B , which is a view along a centre axis of the single line quick connector  10 , collet fingers  19  on the single line quick connector  10  for engagement with the fluid connection interface  2  on the subsea component  1  is shown. 
       FIGS.  3 A- 3 E  are different cross sectional views of a single line quick connector  10  according to the invention, where  FIG.  3 A  is a view along an axis extending through the single line quick connector  10  seen from the ROV connection end of the connector  10 ,  FIG.  3 B  is a side view of the single line quick connector  10 ,  FIG.  3 C  is a view along section A-A in  FIG.  3 A ,  FIG.  3 D  is a view along section B-B in  FIG.  3 C  and  FIG.  3 E  is a view along section C-C in  FIG.  3 B . In  FIG.  3 A , the termination  16  of the screw element is shown. This termination  16  is shown as a screw head or knob and is rotatably operated by an ROV (ROV not shown in  FIG.  3 A , see  FIG.  1 G ) via e.g. API 17H bucket interface or paddle interface/handle (see e.g.  FIG.  1 F ). The single line quick connector  10  comprises an outer housing  11  with a ROV connectable hub  32  in the form of an API 17H bucket in the distal end facing away from the end of the single line quick connector  10  which is engageable to the fluid connection interface  2  on the subsea component  1 . 
     Now referring to  FIGS.  3 C and  3 D, and  4 A and  4 B , details of the operational relationship of the components of the single line quick connector  10  will be described. 
     The single line quick connector  10  comprises an outer housing  11  comprising an ROV interface  12  in one axial end thereof for operation by a Remotely Operated Vehicle (ROV)  3 . The opposite axial end of the single line quick connector  10  is for connection to the fluid connection interface  2  on the subsea component  1 . 
     Starting from the axial end at the position of the ROV interface  12 , the single line quick connector  10  comprises a screw element  13  which is rotationally movable and axially fixed relative the outer housing  11 . The screw element  13  extends in a longitudinal direction of the connector  10  and comprises external threads  15  along a part of its axial length and a termination  16  which is operable by an ROV  3 . The screw element  13  is arranged in a fastening plate  39 . The fastening plate  39  is rotationally connected to the outer housing  11  and covers the radial cross section of the single line quick connector  10 . The fastening plate  39  comprises a center opening  40  for receiving the screw element  13  therethrough and peripheral openings  41  for receiving axially extending elements  30 . A distance plate  42  with a corresponding center opening  40  and peripheral openings  41  may be arranged adjacent the fastening plate  39  between the fastening plate  42  and a collet sleeve  17 . A contra nut  9  may be fixedly connected to the distance plate  42  and serves as a lock for the screw element  13  when in an end position such that the screw element  13  can “lift” the single line quick connector when disconnecting/releasing from the component  1 . The collet sleeve  17  is rotationally fixed and axially movable relative the outer housing  11 , and comprises a connection ring  31  for termination of a number of collet fingers  19 . The connection ring  31  comprises a center screw element bore  38  and peripheral axial bores  37  aligned with the center openings  40  and peripheral openings  41  of the fastening plate  39  and distance plate  42 , respectively. The screw element bore  38  of the collet sleeve  17  comprises internal threads  18  for cooperation with the external threads  15  on the screw element  13 . The collet sleeve  17  further comprises a plurality of collet fingers  19  connected to the connection ring  31  an axial end thereof and radially flexible collet fingers  19  in an opposite axial end thereof for snap-lock connection to the fluid connection interface  2  on the subsea component  1 . The outer housing  110  comprises an inner axial portion with increased diameter  28  for receiving the collet fingers  19  representing an open position of the connector  2  where the collet fingers  19  are disengaged or released relative the fluid connection interface  2  on the subsea component  1 , and an inner axial portion with reduced diameter  29  for receiving the collet fingers  19  representing an engaged, locked or connected position of the connector  10  where the collet fingers  19  are locked to the fluid connection interface  2  on the subsea component  1 . 
     The collet sleeve  17 , fastening plate  39  (and ROV connectable hub  32 ) and distance plate  42  are rotationally locked to the outer housing  11  by axially extending elements  30  running through the peripheral openings  41  in the fastening plate  39  and distance plate  42 , respectively, and through the peripheral axial bores  37  of the connection ring  31 . The ROV connectable hub  32  is secured to the outer housing  11  by the axially extending elements  30  which run through the ROV connectable hub  32  and into axially extending threaded fastening holes  44  (see.  FIG.  4 A ) in the outer housing  11 . However, the outer housing  11  and the fastening plate  39  are axially movable relative the collet sleeve  17  and the distance plate  42  which facilitate that a rotation of the screw element  13  result in an axial movement of the outer housing  11  relative the collet sleeve  17 . The setup of the single line quick connector  10  and its engagement and disengagement to the fixed fluid connection interface  2  on the subsea component  1 , involves that it is actually the outer housing  11  together with the axially fixed fluid line insert  17  that move relative the fixed fluid connection interface  2  and the collet sleeve  17 . I.e., once the single line quick connector  10  is in correct position relative the fluid connection interface  2 , the collet fingers  19  are at the same axial distance from the fluid connection interface  2  while the radial distance varies depending on whether the collet fingers  19  are engaged with the fluid connection interface  2  or disengaged from the fluid connection interface  2  (depending on whether the collet fingers  19  are located in the inner axial portion  29  with reduced diameter or the inner axial portion  28  with increased diameter of the outer housing  11 ). 
     The outer housing  11  further comprises a through-going opening  21  and the collet sleeve  17  comprises at least one recess  22  between neighboring collet fingers  19 . The through-going opening  21  and the at least one recess  22  are arranged such that, when connected, they are configured to accommodate a fluid line insert  23 . The at least one recess  22  has a longer axial extension than the fluid line insert  23  when the fluid line insert  23  is accommodated in the at least one recess  22  which enables the possibility of axial relative movement of the fluid line insert  23  along the at least one recess  22 . 
     The fluid line insert  23  is connectable to the hydraulic fluid line  20  and comprises a groove  24  for a hydraulic coupler  25  (coupler  25  not shown, see  FIGS.  6 A and  6 B ). The fluid line insert  23  is preferably securely fastened to the outer housing  11  by fastening means  36  through holes  35  such that the fluid line insert  23  is axially and rotationally fixed to the outer housing  11 . A guide pin  47  assists in guiding the fluid line insert  23  correctly relative the outer housing  11 . 
     The outer housing  11 , the screw element  13  and the collet sleeve  17  are arranged such that: a rotation of the screw element  13  in a first direction results in an axial movement of the outer housing  11  relative the collet sleeve  17 , and thus the collet fingers  19 , in a first axial direction, and a rotation of the screw element  13  in a second direction, opposite of the first rotational direction, results in an axial movement of the outer housing  11  relative the collet sleeve  17 , and thus the collet fingers  19 , in a second direction, which is opposite to the first axial direction. 
     A flow bore  14  provides fluid connection through the hydraulic coupler  25  with the fluid connection interface  2  on the subsea component  1  when the single line quick connector  10  is connected to the fluid connection interface  2 . 
       FIG.  4 A  is an exploded view of a single line quick connector according to the invention, and  FIG.  4 B  is an enlarged view of the fluid line insert in detail D in FIG.  4 A. Referring to  FIGS.  4 A and  4 B , the fluid line insert  23  comprises a through-bore  26  in fluid communication with the flow bore  14  and a connection interface  27  for connection to the hydraulic fluid line  20  (see e.g.  FIGS.  2 A,  2 B,  2 C,  6 B ), such that when the fluid line insert  23  is accommodated in the through-going opening  21  in the sidewall of the outer housing  11  and the hydraulic fluid line  20  is connected to the fluid line insert  23  and the hydraulic coupler  25  is positioned in the flow bore  14  and the fluid line insert  23 , a hydraulic communication line is formed between the hydraulic fluid line  20  and the flow bore  14  through the hydraulic coupler  25 . 
     The size and shape of the fluid line insert  23  and the through-going opening  21  in the outer housing  11  are complementary such that a tight fit preventing leaks is formed between the them when the fluid line insert  23  is accommodated in the through-going opening  21 . This gives a tight and stable positioning of the coupler  25  such that the coupler is fluid tight while at the same time is compensated relative water depth (if used subsea). 
       FIG.  5    shows the collet fingers  19  of the single line quick connector  10  engaged with a fluid connection interface  2  on a subsea component  1 . The coupler  25  has a male interface  101  for connection to the component  1  and a female interface  111  in an opposite axial end of the male interface  101 . 
     In operation, with reference to  FIGS.  3 C,  3 D,  4 A,  4 B and  5    engaging the single line quick connector  10  to a fluid connection interface  2  on a subsea component  1 , may comprise the steps of:
         radially positioning the fluid line insert  23  into the through-going opening  21  of the outer housing  11  and the at least one recess  22  of the collet sleeve  17 ,   positioning a hydraulic coupler  25  inside the flow bore  14  and the groove  24  of the fluid line insert  23 ,   providing the connector  10  with the collet fingers  19  in a disengaged position in an inner axial portion  28  with increased diameter,   moving the connector  10  relative the fluid connection interface  2  into a position where the collet fingers  19  snap onto the fluid connection interface  2  on the subsea component  1 ,   rotating the screw element  13  in a first direction resulting in an axial movement of the outer housing  11  relative the collet sleeve  17 , and thus the collet fingers  19 , to an engaged position (i.e. inner axial portion  29  with reduced diameter) where the collet fingers  19  lock around the fluid connection interface  2 ,   connecting a hydraulic fluid line  20  to the fluid line insert  23 .       

     The steps of disengaging the connector  10  from the fluid connection interface  2  may comprise the steps of:
         rotating the screw element  13  in a second direction, opposite of the first rotational direction, resulting in an axial movement of the outer housing  11  relative the collet sleeve  17 , and thus the collet fingers  19 , to a disengaged position where the collet fingers  19  unlock from the fluid connection interface  2 .       

     The single line quick connector further comprises an override function in the event the single line quick connector  10  malfunctions (i.e. gets stuck or broken) when it is in the engaged position and locked onto the fluid connection interface  2  on the subsea component  1 . Overriding the single line quick connector  10  may comprise the steps of:
         providing a milling tool on a Remotely Operated vehicle (ROV)  3 ,   utilizing said milling tool to mill an annular groove around the screw element  13  through the fastening plate  39  and any distance plate  42 . The axial milling distance being at least equal to a travel distance of the collet sleeve  17 . The milling resulting in loosening the axially fixed relationship of the screw element  13  relative the outer housing  11  (via the fastening plate  39 ),   utilizing a pushing tool of the ROV  3  to axially move the outer housing  11  relative the screw element  13  and the collet sleeve  17  to the disengaged position.       

       FIGS.  6 A and  6 B  show details of a hydraulic coupler  25  and a dust cap  33  of a single line quick connector  10  according to the invention in two different side views. The dust cap  33  protects the components of the single line quick connector  10  which engages the fluid connection interface  2  on subsea component  1 , such as the distal end of the outer housing  11  and the collet fingers  19 . The hydraulic coupler  25  serves to provide fluid connection between the fluid connection interface  2  on subsea component  1  and the hydraulic fluid line  20  connected to the single line quick connector  10  via the connection interface  27 . A blind plug  34  may be provided to protect the connection interface  34  when the single line quick connector  10  is used as a protection/pressure cap for the hydraulic fluid line  20 . 
     Referring to  FIG.  6 B , the hydraulic fluid line  20  is disclosed connected to the connection interface  27  and typically extends to a surface location or to next X-mas tree, to manifold, subsea distribution unit etc. A tension reliever  100  may be connected to the single line quick connector for supporting the hydraulic fluid line  20 . This may be an advantage in situations where the hydraulic fluid line  20  is oriented in an abnormal angle or direction relative the connection interface for the hydraulic fluid line  27 . 
     The invention is now explained with reference to non-limiting embodiments. However, a skilled person will understand that there may be made alterations and modifications to the embodiment that are within the scope of the invention as defined in the attached claims. 
     
       
         
           
               
             
               
                   
               
               
                 List of references: 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                 1 
                 Component/Subsea component 
               
               
                 2 
                 Fluid connection interface on subsea component 
               
               
                 3 
                 Tool/Remotely Operated Vehicle (ROV) 
               
               
                 4 
                 Power and communication line for ROV 
               
               
                 5 
                 Vessel 
               
               
                 6 
                 Surface of water 
               
               
                 7 
                 Seabed 
               
               
                 8 
                 Guide portion 
               
               
                 9 
                 Contra nut 
               
               
                 10 
                 Single line quick connector 
               
               
                 11 
                 Outer housing 
               
               
                 12 
                 ROV interface 
               
               
                 13 
                 Screw element 
               
               
                 14 
                 Flow bore 
               
               
                 15 
                 External threads on screw element 
               
               
                 16 
                 Termination of screw element 
               
               
                 17 
                 Collet sleeve 
               
               
                 18 
                 Internal threads 
               
               
                 19 
                 Collet fingers 
               
               
                 20 
                 Fluid line/Hydraulic fluid line 
               
               
                 21 
                 Through-going opening of housing 
               
               
                 22 
                 Recess 
               
               
                 23 
                 Fluid line insert/fluid line block insert 
               
               
                 24 
                 Groove for receiving hydraulic coupler 
               
               
                 25 
                 Coupler/Hydraulic coupler 
               
               
                 26 
                 Through-bore of fluid line insert 
               
               
                 27 
                 Connection interface for hydraulic fluid line 
               
               
                 28 
                 Inner axial portion with increased diameter 
               
               
                 29 
                 Inner axial portion with reduced diameter 
               
               
                 30 
                 Axially extending elements 
               
               
                 31 
                 Connection ring 
               
               
                 32 
                 ROV connectable hub 
               
               
                 33 
                 Dust Cap 
               
               
                 34 
                 blind plug 
               
               
                 35 
                 Hole for receiving fastening means 
               
               
                 36 
                 Fastening means for securing fluid line insert 
               
               
                 37 
                 Bore 
               
               
                 38 
                 Screw element bore 
               
               
                 39 
                 Fastening plate 
               
               
                 40 
                 Center opening 
               
               
                 41 
                 Peripheral opening 
               
               
                 42 
                 Distance plate 
               
               
                 44 
                 Fastening holes 
               
               
                 45 
                 Diver 
               
               
                 47 
                 Guide pin 
               
               
                 100 
                 Tension reliever 
               
               
                 101 
                 coupler male interface 
               
               
                 111 
                 coupler female interface