Patent ID: 9581259
Date: 2017-02-28
CPC Classifications: F16K,F16L,Y10T

Claim:
1. A method of installing an Emergency Flow Restrictor Device (EFRD) on a pipeline, comprising: providing a first face plate having a first sealing face and a second face plate having a second sealing face, each of the first and second face plates having two or more segments that, when assembled, circumscribe the pipeline; assembling the first face plate and the second face plate on the pipeline such that the first sealing face is in face to face, spaced relation to the second face plate and separated by a section of pipeline, and the first face plate and the second face plate being welded to the pipeline; assembling a cutting device such that the cutting device radially circumscribes the pipeline between the first face plate and the second face plate, providing a valve body having two or more segments that, when assembled, sealingly encloses a length of pipeline and defines an access opening; assembling the valve body on the length of pipeline such that the valve body encloses the first face plate, the second face plate and the cutting device in an interior of the valve body; installing an access valve on the access opening, the access valve providing selective access to the interior of the valve body; securing a cutting tower to the access valve and the cutting device; operating the cutting device to sever the section of pipeline between the first and second sealing faces to form a first cut edge of the pipeline that is flush with the first sealing face of the first face plate and a second cut edge of the pipeline that is flush with the second sealing face of the second face plate; retracting the cutting device and severed section of pipeline inside of the cutting tower; closing the access valve and removing the cutting tower from the access valve; connecting a control section to the access valve, the control section having a control linkage that carries a valve gate member of the EFRD; and moving the access valve to the open position and lowering the valve gate member of the EFRD through the access valve into position to selectively close the pipeline against at least one of the first and second face plates.