Patent Publication Number: US-8534142-B1

Title: Method for measuring back pressure in open ended chemical reactor tubes

Description:
FIELD 
     The present embodiments generally relate to a method for measuring back pressure in open ended chemical reactor tubes, such as catalyst tubes for a chemical plant. 
     BACKGROUND 
     A need exists for a method for measuring back pressure in open ended chemical reactor tubes that uses individually replaceable heads for the testing process. 
     A need exists for a method for measuring back pressure in open ended chemical reactor tubes that can accurately flow air to chemical reactor tubes individually, thereby ensuring that each chemical reactor tube is properly tested. 
     A need exists for method for measuring back pressure in open ended chemical reactor tubes that can continue to be used even if one of the test heads is defective or needs replacement. 
     The present embodiments meet these needs. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
       The detailed description will be better understood in conjunction with the accompanying drawings as follows: 
         FIG. 1A  depicts an overview of the system. 
         FIG. 1B  depicts a cross section of an individually removable and replaceable test head umbilical. 
         FIG. 2  depicts a detailed view of a continuous real-time monitor and display device. 
         FIGS. 3A-3B  depicts a detail of a controller and a controller data storage. 
         FIGS. 4A-4B  depict detailed views of an automated test head, a chemical reactor tube, and a colored tube cap. 
         FIGS. 5A-5B  depict detailed views of a manual test head in a pretesting position and testing position. 
         FIGS. 6A-6B  depict a flow diagram of an embodiment of the method using an automated test head. 
         FIG. 7  depicts a flow diagram of an embodiment of the method using a manual test head. 
     
    
    
     The present embodiments are detailed below with reference to the listed Figures. 
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Before explaining the present method in detail, it is to be understood that the method is not limited to the particular embodiments and that it can be practiced or carried out in various ways. 
     The present embodiments relate to a method for measuring back pressure in open ended chemical reactor tubes. 
     The method can use a continuous real-time monitor and display connected to a programmable controller, a manifold connected to the continuous real-time monitor and display, a plurality of individual umbilicals connected to the manifold, and a plurality of test heads connected to each individual umbilical. Each test head can be automatic or manual. 
     The automated test heads can be remotely controlled, allowing for fewer number of employees to be present near high pressure catalysts; thereby improving safety for the employees. For example, the high pressure catalysts, which can be an explosive powder, can be located in a confined space where it can be dangerous for employees to be present. 
     The method can be implemented faster than manual processes currently used because the pressure heads can enable quicker seals without requiring a person to hold the seals in place; thereby preventing leakage. 
     The method can be versatile, because the method can include using test heads of different sizes configured to accommodate different sized chemically loaded tubes, chemically unloaded tubes, partially filled chemical tubes, partially filled with catalyst tubes, or the like. 
     Test heads can be individually replaceable, providing a system with a longer life span. Also, the continuous real-time monitor and display device can be individually replaced without replacing other components usable with the method. 
     The method can have a lower maintenance cost than current devices, in-part because if one umbilical usable with the method becomes defective, that umbilical can be replaced without replacing other components usable with the method. 
     Turning now to the Figures,  FIG. 1A  depicts an overview of the system  8 . The system  8  can include a continuous real-time monitor and display device  10 . 
     The continuous real-time monitor and display device  10  can be bi-directionally connected to a controller  50 , such as through a bi-directional multiline air, power, and signal line  64 . 
     The controller  50  can bi-directionally communicate compressed air, power, and sensor signals to and from the continuous real-time monitor and display device  10 . The bi-directional multiline air, power, and signal line  64  can communicate into the continuous real-time monitor and display device  10  through a bi-directional multiline air, power, and signal port  28 . 
     The controller  50  can be in communication with a power source  49  for receiving power therefrom. The controller  50  can also be in communication with a compressed air source  44  through a compressed air inlet  47  for receiving compressed air  46  therefrom. 
     The continuous real-time monitor and display device  10  can have a display housing  11 . 
     The continuous real-time monitor and display device  10  can have a display emergency stop button  14  located on the display housing  11 . In one or more embodiments, the display emergency stop button  14  can be in communication with an air regulator and a processor with computer instructions that allow a local operator to stop the operation of the system  8 . 
     The continuous real-time monitor and display device  10  can have a display  16 . Embodiments of the continuous real-time monitor and display device  10  can have a switch that can be used to turn the system  8  on and off. The switch can be mounted to the controller  50  or the display housing  11 , and can be in communication with a controller processor. 
     The system  8  can have a multiport manifold  40  in communication with the continuous real-time monitor and display device  10 . For example, the continuous real-time monitor and display device  10  can have a plurality of first compressed air outlets, such as first compressed air outlets  30   a  and  30   f , in communication with a plurality of manifold inlets, such as manifold inlets  96   a  and  96   f , to communicate into the multiport manifold  40 . 
     The plurality of first compressed air outlets  30   a  and  30   f  and the plurality of manifold inlets  96   a  and  96   f  can be quick disconnects, which can allow for fast assembly of the system  8 , such as a set-up time of less than 10 minutes. 
     The plurality of first compressed air outlets  30   a  and  30   f  can be configured to flow the compressed air  46  from the display housing  11  to each test head seal portion of a plurality of test heads, such as test heads  80   a  and  80   f . The compressed air  46  can expand each test head seal portion against an inner wall of one of a plurality of chemical reactor tubes, such as chemical reactor tubes  36   a  and  36   f.    
     The continuous real-time monitor and display device  10  can have a plurality of second compressed air outlets, such as second compressed air outlets  31   a  and  31   f , in communication with the multiport manifold  40  for flowing compressed air  46  from the display housing  11  through each of the plurality of the test heads  80   a  and  80   f  and into each of the chemical reactor tubes  36   a  and  36   f.    
     The plurality of second compressed air outlets  31   a  and  31   f  can be in communication with the multiport manifold  40  through a plurality of manifold inlets, such as manifold inlets  96   g  and  96   l , which can also be quick disconnects. 
     The multiport manifold  40  can be in communication with the plurality of test heads  80   a  and  80   f , through a plurality of individually removable and replaceable test head umbilicals, such as individually removable and replaceable test head umbilicals  73   a  and  73   f.    
     In operation, the multiport manifold  40  can transmit compressed air  46  to the continuous real-time monitor and display device  10 . The compressed air  46  transmitted from the multiport manifold  40  to the continuous real-time monitor and display device  10  can be individually regulated and controlled within each of the plurality of individually removable and replaceable test head umbilicals  73   a  and  73   f . In one or more embodiments, each of the plurality of individually removable and replaceable test head umbilicals  73   a  and  73   f  can have a different pressure. 
     The plurality of test heads  80   a  and  80   f  can be in communication with the plurality of chemical reactor tubes  36   a  and  36   f . The plurality of individually removable and replaceable test head umbilicals  73   a  and  73   f  can include groups of similar pressurized air lines, such that a first portion of the plurality of test heads  80   a  and  80   f  can measure loaded chemical reactor tubes  36   a  and  36   f  at a first pressure, a second portion of the plurality of test heads  80   a  and  80   f  can measure partially loaded chemical reactor tubes  36   a  and  36   f  at a second pressure, and a third portion of the plurality of test heads  80   a  and  80   f  can measure empty chemical reactor tubes  36   a  and  36   f  at a third pressure. As such, the system  8  can provide for faster group analysis of various chemical reactor tubes  36   a  and  36   f  at various pressures. 
     In operation, compressed air  46  can be transmitted through the plurality of test heads  80   a  and  80   f  to simultaneously measure pressure in the chemical reactor tubes  36   a  and  36   f  and transmit the measured pressure as sensor signals to the controller  50 . 
     The system  8  can be modular, which makes the system  8  easy to repair. The system  8  can also be easy to maintain, in-part because each component of the system can be individually cleaned without having to shut down and disassemble the entire system  8 . For example, one test head of the plurality of test heads  80   a  and  80   f  can be removed and cleaned while the remainder of the system  8  continuous to operate; providing a major safety improvement over current test systems. 
       FIG. 1B  depicts a cross section of an individually removable and replaceable test head umbilical  73 . 
     The individually removable and replaceable test head umbilical  73  can include a signal line  76 , an air line  78 , and a power line  79 , which can all be disposed within a polymer tape  98 . 
     The signal line  76 , air line  78 , and power line  79  can extend parallel to each other within the polymer tape  98 . 
       FIG. 2  depicts a detailed view of an embodiment of the continuous real-time monitor and display device  10 . The continuous real-time monitor and display device  10  can provide for real-time display of sensor signals  21  and compared sensor results  23 . For example, the continuous real-time monitor and display device  10  can continually update the display  16  from about every 1 second to about every 5 seconds to present the sensor signals  21  and compared sensor results  23  from each test head. 
     The continuous real-time monitor and display  10  can include the display housing  11  with a face plate  13 . The display housing  11  and face plate  13  can be an aluminum box housing with a door, which can be sealed to enable an airtight and watertight connection between the aluminum box and the door. 
     The continuous real-time monitor and display  10  can be supported on a tripod  110 . The tripod  110  can be a collapsible foldable support structure. 
     The display housing  11  can include a power and signal transmitter  12 , such as a mini-transmitter model A-10 available from WIKA Instrument Corporation. The power and signal transmitter  12  can be from about 1 inch long to about 3 inches long. 
     The power and signal transmitter  12  can be in communication with a display processor  18  in the display housing  11 . The display processor  18  can be in communication with a display data storage  20  in the display housing  11 . 
     The display data storage  20  can have computer instructions to instruct the display processor to receive the sensor signals from the test head transmitter/sensor  22 . 
     The display data storage  20  can have computer instructions to instruct the display processor to display the sensor signals on the display  24 . 
     The display data storage  20  can have computer instructions to instruct the display processor to display the compared sensor results on the display  25 . 
     In operation, the sensor signals  21  can be compared to customer preset pressure limits to form the compared sensor results  23 . The continuous real-time monitor and display device  10  can be configured to present the sensor signals  21  from the test head transmitter/sensors and the compared sensor results  23  from the controller in real-time. 
     The face plate  13  can have a touch start button  17 . The touch start button  17  can be a mechanical button mounted to the face plate  13 . The touch start button  17  can be in communication with the display processor  18 . 
     The face plate  13  can include the display emergency stop button  14 , which can be in communication with the controller and the display processor  18 , and can be pressed to actuate a stop of the flow of compressed air and sensor signals to and from the test heads. The display emergency stop button  14  can be used to quickly shut down chemical reactor tubes that might be over pressuring, providing an important safety benefit. 
     The display  16  can be disposed on the face plate  13  and can be electronic. The display  16  can be a graphical user interface configured to graphically present the sensor signals  21  and compared sensor results  23  to users. The display  16  can be in communication with the display processor  18 . 
     The face plate  13  can include a test push button  26  in communication with the bi-directional multiline air, power, and signal port  28  on the display housing  11 . The bi-directional multiline air, power, and signal port  28  can receive the sensor signals  21  from the controller. The test push button  26  can be used to start a particular compressed air test. 
     The face plate  13  can have an on/off switch  19   a  for turning the system on and off. 
     In operation, compressed air  46  can be transmitted through the plurality of test heads to simultaneously measure pressure in the chemical reactor tubes and transmit the measured pressure as the sensor signals  21  to the controller. The controller can use the sensor signals  21  along with data stored in a controller data storage to compute a comparison between the sensed pressure and customer preset pressure values, forming the compared sensor results  23 . 
       FIG. 3A  depicts a detail of the controller  50  with a controller housing  51 . 
     The controller  50  can be in communication with the power source  49  through a power plug  74 . The controller  50  can have a transformer  94  in communication with the power plug  74  for transforming A/C current to D/C current for operating gauges, transmitters, processors, transmitter/sensors and other components of the system. 
     The power plug  74  can be a 110 volt plug configured to receive power to operate a controller processor  52  and to power the controller  50 . The power plug  74  can also be used to power the continuous real-time monitor and display device, and to flow power through each individually removable and replaceable test head umbilical to power each of the plurality of test head. 
     The controller  50  can be in communication with the compressed air source  44  through the compressed air inlet  47  for supplying the compressed air to the controller  50  and other portions of the system including the continuous real-time monitor and display device, the multiport manifold, and the plurality of test heads. 
     The controller processor  52  can be in communication with the transformer  94 , a controller data storage  54 , a network connection  72 , the continuous real-time monitor and display device, and the compressed air source  44 , such as through a controller emergency stop button  62 . 
     The network connection  72  can be an Ethernet port for connecting the controller  50  and the controller processor  52  to a network  75 , such as the internet, allowing for remote operation of the system by a user. For example, the controller  50  can present an executive dashboard  83  on a client device  77  using the network  75 . 
     The controller emergency stop button  62  can be used to ensure that a local operator or user can quickly stop the flow of compressed air to the chemical reactor tubes, such as if pressure in the chemical reactor tubes is at a dangerous level. 
     The controller  50  can include a plurality of control transmitters, such as control transmitter  66   a  and  66   e , which can be small or mini transmitters. Each of the plurality of control transmitters  66   a  and  66   e  can be in communication with the controller processor  52  through a controller signal line  65 . 
     The controller  50  can include a plurality of pressure indicators, such as pressure indicators  68   a  and  68   e . Each of the plurality of pressure indicators  68   a  and  68   e  can be in communication with one of a plurality of individual air regulators, such as individual air regulators  69   a  and  69   e.    
     The plurality of pressure indicators  68   a  and  68   e , which can be pressure gauges, can communication with the controller processor  52  through the plurality of control transmitters  66   a  and  66   e  and the controller signal line  65 . Each of the plurality of pressure indicators  68   a  and  68   e  can be in communication with a test head transmitter/sensor and one of a plurality of individual air regulators  69   a  and  69   e.    
     The controller  50  can include a master air regulator  70  connected to the plurality of individual air regulators  69   a  and  69   e . The master air regulator  70  can be in communication with the controller emergency stop button  62  through the controller processor  52  through a controller air line  67 . The controller can have an on/off switch  19   b  for turning the controller on and off. 
       FIG. 3B  depicts a detail of the controller data storage  54 . 
     The controller data storage  54  can have various computer instructions programmed therein. For example, the controller data storage  54  can have a library  58  including customer preset pressure limits  57   a ,  57   b , and  57   c.    
     The controller data storage  54  can have computer instructions to instruct the controller processor to receive the sensor signals from each test head sensor/transmitter  55 . 
     The controller data storage  54  can have computer instructions to compare the sensor signals to the customer preset pressure limits  56 . 
     The controller data storage  54  can have computer instructions to instruct the controller processor to allow a local operator to actuate the controller emergency stop button  60 . 
     The controller data storage  54  can have computer instructions to instruct the controller processor to allow a remote user to initiate the controller emergency stop button  61 . 
     The sensor signals  21  and the compared sensor results  23  can be stored in the controller data storage  54 . 
     In operation, the controller can use the sensor signals  21 , data stored in the controller data storage  54 , the library  58  of customer preset pressure limits  57   a ,  57   b  and  57   c , and the various computer instructions in the controller data storage  54 , including comparison algorithms, in order to compute a comparison between the sensed pressures of the sensor signals and the customer preset pressure limits  57   a ,  57   b  and  57   c ; thereby forming the compared sensor results  23 . 
     The controller can use the controller processor and other equipment to transmit the compared sensor results  23  and/or the sensor signals  21  to the display of the continuous real-time monitor and display device. 
       FIGS. 4A-4B  depict an automated test head  80 , which can be air actuated. The automatic test head  80  can have a test head body  90 , which can be a bi-directional multiline compress test head body. 
     The automated test head  80  can have a first test head compressed air inlet port  85  and a second test head compressed air inlet port  86 . 
     In operation, the first test head compressed air inlet port  85  can flow compressed air into the test head body  90  to expand and seal a test head seal portion  87  against the inner wall  38  of a chemical reactor tube  36 . 
       FIG. 4A  shows the test head seal portion  87  sealed against the inner wall  38  of the chemical reactor tube  36 , and  FIG. 4B  shows the automated test head  80  removed from the chemical reactor tube  36 . 
     Simultaneously, while using the compressed air to seal the automated test head  80  to the chemical reactor tube  36 , compressed air can be transmitted into the automated test head  80  through the second test head compressed air inlet port  86 . 
     The second test head compressed air inlet port  86  can flow compressed air through the test head body  90  and out of a test head seal outlet  88  into the chemical reactor tube  36 ; thereby enabling the test head transmitter/sensor  82  to measure the pressure in the chemical reactor tube  36 . In operation, the system can be used to measure the pressure in loaded, partially loaded, and unloaded chemical reactor tubes  36  for comparison purposes. 
     The automated test head  80  can be used to simultaneously measure pressure in the chemical reactor tube  36  and transmit the measured pressure as sensor signals to the controller through a signal line  76 , which can also be called a transmitter connection. 
     The first test head compressed air inlet port  85 , the second test head compressed air inlet port  86 , and the signal line  76  can each be a portion of one of the plurality of individually removable and replaceable test head umbilicals. 
     The test head transmitter/sensor  82  can be connected to the automated test head  80  and the signal line  76 , which can transmit the sensor signals from the automated test head  80  to the controller processor of the controller. 
     The automated test head  80  can be engaged within the chemical reactor tube  36 , as shown in  FIG. 4A . The chemical reactor tube  36  can be loaded with a catalyst  37 . 
     To use the automated test head  80 , an operator can first connect the individually removable and replaceable test head umbilical to the miniport manifold. 
     The operator can then connect the multiport manifold to the continuous real-time monitor and display device. 
     The operator can then connect the continuous real-time monitor and display device to the controller. 
     The operator can power the controller, such as by providing electricity to the controller, which can in-turn power the entire system. 
     The operator can then allow compressed air from the compressed air source to enter the controller, which can pressurize the entire system. The pressure of the compressed air can vary depending on the chemical reactor tube  36  being analyzed. For example, the pressure of the compressed air can range from about 0 pounds per square inch to about 1000 pounds per square inch, such as 90 pounds per square inch, depending upon the application. 
     The customer preset pressure limits can be inputted into the controller data storage. 
     The automated test head  80  can be tested to ensure that the compressed air is flowing, and to ensure that the test head transmitter/sensor  82  is operational using a test stand of the chemical reactor tube  36  with a known pressure. The entire system can be properly calibrated to within +/−1 percent. 
     Next, the automated test head  80  can be inserted into the chemical reactor tube  36 , such as at a customer site. 
     The operator can initiate pressurization of the automated test head  80  in the chemical reactor tube  36  by activating the touch start button of the display in the continuous real-time monitor and display device. 
     The controller can receive the sensor signals from each of the test head transmitter/sensor  82 . The controller can then compare the sensor signals to the customer preset limits. 
     The controller can transmit the compared sensor results to the display every two seconds to present the compared sensor results. The compared sensor results can also be transmitted to a network, such as a satellite network or the internet to client devices; enabling remote users to monitor the process, such as with an executive dashboard on the client device. 
     The compared sensor results and the sensor signals can be stored in the controller data storage. The operator can print out any data in the controller data storage by connecting the network connection of the controller to a printer. 
     A colored tube cap  112  can be placed over the chemical reactor tube  36  after testing is complete. 
       FIGS. 5A-5B  depict a detailed view of an embodiment of a manual test head  100 .  FIG. 5A  shows the manual test head  100  with a handle  105  extending parallel to a manual test head body  106 , and  FIG. 5B  shows the manual test head  100  with the handle  105  extending perpendicular to the manual test head body  106 . The manual test head body  106  can be pivotably connected to the handle  105 . 
     The manual test head  100  can be operated in a similar manner as the automated test head of  FIGS. 4A-4B , however, the manual test head  100  can have the handle  105  for connecting to an individually removable and replaceable test head umbilicals  73 . 
     A manual test head seal portion  108  can be connected to the manual test head body  106 . 
     A manual test head seal outlet  109  can be centrally formed in the manual test head seal portion  108 . 
     A manual test head compressed air inlet port  102 , which can be a portion of the individually removable and replaceable test head umbilicals  73 , can flow compressed air through the manual test head body  106  and out of the manual test head seal outlet  109  to a chemical reactor tube  36 . 
     A manual test head transmitter/sensor  103  can be connected to the manual test head body  106  for sensing pressure in the chemical reactor tube  36 , and transmitting the sensed pressure as a sensor signal through a signal line  76 , which can be in communication with the controller processor of the controller. 
     The manual test head  100  can be placed into the chemical reactor tube  36  using the handle  105 , which can be axially aligned with the manual test head body  106 . 
     To operate the manual test head  100 , the handle  105  can be pivoted to be oriented at a 90 degree angle to the manual test body  106  as shown in  FIG. 5B ; thereby causing the manual test head seal portion  108  to extend and form a seal with the inner wall  38  of the chemical reactor tube  36  and allowing the compressed air to pass into the chemical reactor tube  36  through the manual test head seal outlet  109 . In this Figure, the chemical reactor tube  36  is shown loaded with catalyst  37 . 
     The manual test head transmitter/sensor  103  can then sense pressure in the chemical reactor tube  36  and transmit the sensed pressure as sensor signals to the controller processor of the controller. 
       FIGS. 6A-6B  depict an embodiment of a method for measuring back pressure in open ended chemical reactor tubes. 
     The method can include connecting each of a plurality of test heads to individually removable and replaceable test head umbilicals, as illustrated by box  600 . 
     The method can include connecting each individually removable and replaceable test head umbilical to a multiport manifold, as illustrated by box  602 . 
     The method can include connecting the multiport manifold to a continuous real-time monitor and display device, as illustrated by box  604 . 
     The method can include supporting the continuous real-time monitor and display device using a tripod, as illustrated by box  606 . 
     The method can include connecting the continuous real-time monitor and display device to a controller, as illustrated by box  608 . 
     The method can include providing power to the controller and transmitting power through the controller to: the continuous real-time monitor and display device, each individually removable and replaceable test head umbilical, and each test head, as illustrated by box  610 . 
     For example, an operator can turn on the system by engaging an on/off switch to provide electricity to each component usable to implement the method via the controller. 
     The method can include powering the controller, the continuous real-time monitor and display device, the multiport manifold, and the plurality of test heads using a 24 volt DC continuous supply power source, as illustrated by box  612 . 
     The method can include using a transformer disposed in the controller between a power source and the controller processor to transform A/C current to D/C current, as illustrated by box  614 . 
     The method can include allowing compressed air to flow from a compressed air source through the controller to the continuous real-time monitor and display device, then to the multiport manifold, then to each individually removable and replaceable test head umbilical, and to each test head, as illustrated by box  616 . 
     In operation, the compressed air can pressurize the entire system usable to implement the method. 
     The method can include flowing the compressed air through air supply conduits between: the controller and the continuous real-time monitor and display device, the continuous real-time monitor and display device and the multiport manifold, and the multiport manifold and the plurality of test heads, as illustrated by box  618 . 
     The method can include using a plurality of quick disconnects to engage each air supply conduit with: the controller, the continuous real-time monitor and display device, the multiport manifold, and the plurality of test heads, as illustrated by box  620 . 
     The method can include using a power line within the individually removable and replaceable test head umbilical to transfer power between the multiport manifold and the plurality of test heads, as illustrated by box  622 . 
     The method can include using a signal line within the individually removable and replaceable test head umbilical to transfer the sensor signals between the multiport manifold and the plurality of test heads, as illustrated by box  624 . 
     The method can include using an air line within the individually removable and replaceable test head umbilical to transfer the compressed air between the multiport manifold and the plurality of test heads, as illustrated by box  626 . 
     The method can include inserting customer preset pressure limits into a controller data storage connected to a controller processor of the controller, as illustrated by box  628 . 
     The method can include pre-testing each test head against a known loaded chemical reactor tube with a known pressure to ensure proper calibration within +/−1 percent, as illustrated by box  630 . 
     The method can include inserting each pre-tested test head into a loaded chemical reactor tube, as illustrated by box  632 . 
     The method can include individually initiating pressurization of each test head in the chemical reactor tubes by activating the continuous real-time monitor and display device, as illustrated by box  634 . 
     For example, the operator can initiate pressurization of the test heads in the chemical reactor tubes by activating the touch start button on the display of the continuous real-time monitor and display device. 
     The method can include transmitting sensor signals to the controller from a test head transmitter/sensor on each test head to provide the controller with sensed pressures on a real-time basis, as illustrated by box  636 . 
     The method can include storing the sensor signals and the compared sensor results in the controller data storage, as illustrated by box  638 . 
     The method can include using the controller to compare the sensor signals to the customer preset pressure limits, forming compared sensor results, as illustrated by box  640 . 
     The method can include transmitting the compared sensor results to the continuous real-time monitor and display device, as illustrated by box  642 . 
     For example, the controller can transmit the compared signal results every two seconds to the display for presentation thereon. The controller can transmit the compared sensor results with or without the raw sensor signals. The controller can also transmit the compared sensor results and the sensor signals over a network. 
     Users can communicate with the controller, such as by using an executive dashboard on a client device, to monitor and provide emergency stop instructions to the controller. 
     The method can include presenting the compared sensor results to a local user on a display of the continuous real-time monitor and display device, transmitting the compared sensor results over a network to a remote user, or combinations thereof, as illustrated by box  644 . 
     The method can include printing the sensor signals, the compared sensor results, or combinations thereof by connecting the controller to a network with a printer, as illustrated by box  646 . 
     The method can include engaging a colored tube cap over each chemical reactor tube after pressure testing is complete to identify chemical reactor tubes that need replacement, as illustrated by box  648 . 
       FIG. 7  depicts an embodiment of the method using a manual test head. 
     The method can include placing each manual test head into one of the chemical reactor tubes using the handles such that a test head body of each manual test head is oriented in parallel to the handles, as illustrated by box  700 . 
     The method can include re-orienting the handles to be disposed perpendicular to the test head bodies and causing a test head seal portion of the manual test heads to extend and form seals with an inner wall of the chemical reactor tubes, as illustrated by box  702 . 
     The method can include allowing compressed air to be passed into the chemical reactor tubes through a test head seal outlet of each manual test head, as illustrated by box  704 . 
     The method can include sensing pressure in each chemical reactor tube using a manual test head transmitter/sensor of each manual test head, as illustrated by box  706 . 
     The method can include transmitting the sensed pressures as the sensor signals to the controller, as illustrated by box  708 . 
     While these embodiments have been described with emphasis on the embodiments, it should be understood that within the scope of the appended claims, the embodiments might be practiced other than as specifically described herein.