China National Petroleum Corp (CNPC) has selected Bettis PressureGuard, self-contained hydraulic shut-down systems from Emerson Process Management for use in the Dazhangtou natural gas storage reservoir project in Tianjing, China.
Seven PressureGuard systems, which require no external power source, will protect the gas storage reservoir by closing gate valves when a high-pressure or low-pressure threshold has been reached.
The Dazhangtuo reservoir is the first gas storage facility in China. It strengthens the peak-gas adjustment capacity of the Shan-jing natural-gas pipeline that extends 940 km (585 miles) from Yulin, Shanxi, to Beijing. Gas that is not needed immediately is diverted into underground storage facilities. This enables excess gas delivered during the summer to be made available to help meet the increased demand during the winter.
The Bettis PressureGuard systems are being installed in the well-head area of the gas storage facility, where there is no electrical power. This is an ideal application for the spring-based PressureGuard shut-down systems because no plant air, fuel gas, electricity, or expensive nitrogen back-up systems are required. A self-contained oil reservoir also removes the need for any external hydraulic piping. A pressure pilot, with ‘hi-hi’ and ‘low-low’ options, triggers the system when a pressure threshold is reached.
The system offers built-in temperature compensation and pressure relief and has proven to be highly successful in years of field service under some of the most demanding operating and environmental conditions, claims Emerson. The actuator can be used with either rotary or linear spring-return hydraulic operators to provide a fail-safe system that is adaptable to ball, plug and other quarter-turn valves, and reverse-acting gate and linear-operated valves.
For further information, contact:
Emerson Process Management, 12301 Research Boulevard, Building 3, Austin, TX 78759, USA. Tel: +1-512-835-2190, Web: www.EmersonProcess.com, Web: www.Emerson.com
Emerson Process Management, Horsfield Way, Bredbury, Stockport SK6 2SU, UK. Tel: +44-870-240-1978, Fax: +44-870-240-4389; Email: uksales@emersonprocess.com, Web: www.emersonprocess.co.uk
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