nine steps to double-double isolation & bypass
DESCRIPTION
Downtime and lost opportunity are no longer the inevitable outcomes of pipeline maintenance and repair. Here are nine steps to achieve greater jobsite safety, uninterrupted flow, and increased first-time sealing success.TRANSCRIPT
PhasesFourBY THE NUMBERS of PROGRESSIVE PIGGING DOUBLE ISOLATION & BYPASS
DOUBLE-
1
7
2 6
4
8
NineSteps to
9
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3
Install SANDWICH® Valve and threaded valves. These valves sit atop the fittings to allow for insertion and removal of equipment from the pipe without loss of product.
Fully set downstream plugging head. By setting the second sealing element, which is rated for the full pressure of the line, the upstream head transitions to a neutral environment.
Partially set upstream nose wheel to bottom of pipe. This partial setting of the plugging head slows and diverts product flow into the bypass, allowing the downstream plugging head to be set.
Complete pipeline maintenance. Requisite or preventive pipe maintenance is completed and full operation resumes. With completion plugs and blind flanges set into the fittings, the bypass is disassembled and all temporary equipment is removed.
Weld fittings, tapping fittings, and threaded valve stems on the line. These fittings are permanently affixed to the line to allow mounting of tapping and plugging equipment.
Fully set upstream plugging head. Once set, the upstream sealing element completely stops flow through the isolated area, which is subsequently drained.
Install bypass piping and allow flow through bypass. Bypass piping allows the diversion of product around the isolated section of pipe, enabling the operator to continue producing product and associated revenue.
DOWNTIME AND LOST OPPORTUNITY ARE NO LONGER the inevitable outcomes of pipeline maintenance and repair. Here are nine steps to achieve greater jobsite safety, uninterrupted flow, and increased first-time sealing success.
Tap all fittings. Using pilot drills and cutters, the tapping blade penetrates the pipe wall to allow a path
for equipment insertion.
Open bleed ports to achieve zero energy zone. By opening the bleed ports, the operator achieves true Double Block and Bleed isolation, allowing for excellent sealing and zero product leakage in the isolated area.Illustration features STOPPLE® Train isolation
technology by T.D. Williamson.