API Standard 598 - American Petroleum Institute

1 API Standard 598 Valve Inspection and Testing StandardEditionSectionInquiry #QuestionReply598 Sixth Edition, 1990 reference to Paragraph of api 598 , 6th Edition, 1990, is filling the valve body with the valve in the open position with a fluid at zero pressure, then closing the valve, sufficient to meet the requirement that the manufacturer shall use a method that fills and pressurizes the body cavity between the seats and the bonnet area?No. 598 Seventh Edition, 1996 closure testing a valve in accordance with paragraph , does the requirement in paragraph , which states, "when closure testing gate, plug, and valves, the valve manufacturer shall use a method of testing seat leakage that fills and pressurizes the cavity between the seats and bonnet area, as applicable, with the test fluid to ensure that no seat leakage can escape detection because of gradual filling of these volumes during these test periods," apply? Edition, 1996 Para. all of paragraph deal with resilient seated butterfly valves only?

2 No, paragraph covers other butterfly valve Edition, 1996 Para. resilient seats defined as having polymer (plastic) seats at the seat ring areas?Resilient seats are defined in the Scope paragraph Edition, 1996 Para. valves having metal seat rings and wedge seats of laminated stainless steel with graphite resilient seated? Edition, 1996 Para. high pressure closing testing in the non-preferred direction, is the test pressure times the cold working pressure or the do we test at the manufacturer s reduced differential pressure?Test pressures are defined in Tables 1 A&B and Table Edition, 1996 Table 5598-I-02/02 Table 5 footnote (a) defines 16 drops as equivalent to 1 milliliter. What is the equivalent volume to 16 bubbles?The volumetric equivalent for 16 bubbles is not defined in this Edition, 1996 Testing598-I-03/02 During a test for lubricated plug valve using sealant, the sealant was pushed out before the 2 minutes of test duration, water leakage occurred after 7-8 minutes, is this ok since sealant is not a test fluid?

3 API cannot answer consultative questions. The API cannot state whether a condition is acceptable. 598 Seventh Edition, 1996 Para. nitrogen an acceptable alternative to air as a test fluid in accordance with the requirements in paragraph Edition, 1996 Para. 2000 pounds of exerted force violate section of api 598 ?API cannot state whether a specific force will be in conflict with Section The situation becomes a contractual Edition, 2004 Section 1: In accordance with API Standard 598, 8th edition, Para. , is the calculation to determine reduced differential pressure rating available? Question 2 : In accordance with API Standard 598, 8th edition, does the last sentence in the last paragraph of Para. only apply to butterfly valves?Reply 1: The reduced differential pressure rating shall be as specified by the manufacturer. Reply 2: Yes