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Trelleborg
Seal protects Shah Deniz subsea HIPPS valve
Aug. 25, 2015 + + + Trelleborg Sealing
Solutions has developed a new type of seal for a valve designed by
Aberdeen-based Schoolhill Hydraulic Engineering for BP’s Shah Deniz field
development in the Caspian Sea.
The high flow, high integrity subsea
quick exhaust valve (QEV) was created for a subsea HIPPS (high integrity
pressure protection system).
Trelleborg
engineered a new version of its Captive Glyd Ring in low friction Zurcon
Z43 high modulus thermoplastic, as the seal needed to slide across mating
surfaces that had dimensional changes.
The seal is retained
in a split groove, preventing damage to the sealing surface from a counter
part with variable diameter or when passing holes.
The QEV has a
30-year design life with a valve qualification water depth range of 3,000
m (9,842 ft) and a safety integrity level (SIL) rating of SIL3 with 23,000
accumulated cycles. It provides a flow rate of 22 liters in 5 seconds (260
l/min), and has been designed to ensure quick and safe emergency shutdowns
on the seafloor
Source: Offshore
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