White Paper - T.D. Williamson, Inc.

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6Figure 6: Both STOPPLE ® plugging heads are set in placeand DB&B is swiftly obtained.3.1 EQUIPMENT TESTINGThe STOPPLE ® Train system is also robust enough to handle both lowpressure and high pressure environments. Tests have shown that atlow pressures, compression between the sealing elements and thepipe ID creates an excellent barrier. In fact, the sealing element doesnot even need to be energized to seal. At 0.5 psi to 5 psi, thecompression fit alone is sufficient. Once energized, the seal will remainintact until broken by an external force, such as retraction of theplugging head.
7Figure 7: Low Pressure sealing element tests.On the other end of the pressure spectrum, both plugging heads of theFirst Generation STOPPLE ® Train system are rated to 1,000 psi at180°F, or to 600 psi at 350°F. Subsequent generations are fully ratedto ASME Class 600. They have been tested successfully at 1.5 timesthis rating, and the pressurized plugging heads have been successfullytested together and independently.Because the STOPPLE ® Train plugging system requires only one hottap and a standard fitting, fewer potential leak paths are left on thepiping once work is complete. Compared to other methods forachieving DB&B, which typically require twice as many linepenetrations, this represents a major improvement. Fewer fittings alsoresults in less expense.3.2 MAXIMUM SAFETYThis project required DB&B which was driven by safety concerns. Theadded safety of the STOPPLE ® Train system comes from its two seals.With a tap between the two seals, that area can be monitored forleakage before and during work on the pipeline downstream. In theunlikely event that the first seal leaks, the second seal is fully capableof holding the line pressure by itself.
Page 2: 2ABSTRACTDouble Block and Bleed (DB
Page 8 and 9: 83.3 SUBSTANTIAL SAVINGSAs part of
Page 10: 105.0 CONCLUSIONThe STOPPLE ® Trai

White Paper - T.D. Williamson, Inc.

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