Details

Autor(en) / Beteiligte

• Summers, Angela
• Zachary, Bryan

Titel

Partial-stroke testing of safety block valves

Ist Teil von

• Control Engineering, 2000-11, Vol.47 (12), p.87-89

Ort / Verlag

Barrington: CFE Media

Erscheinungsjahr

2000

Quelle

Business Source Ultimate

Beschreibungen/Notizen

• For many operating companies, the most difficult part of complying with safety standards is the testing of final elements, especially emergency block valves. An option to a full-stroke test is a partial-stroke test. The test involves moving the valve a minimum of 15%, to test a portion of valve failure modes, with the remainder of failure modes being tested during a full-stroke test. The main purpose and benefit of partial-stroke testing is to reduce the required full-stroke testing frequency and associated operational impact. Three basic types of partial-stroke test equipment exist: mechanical limiting, position control, and solenoid valves. Each type involves different levels of sophistication and risk.