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Dears While testing the PSVs, we are following the set pressure tolerance based on below ((ASME Section 8, UG-134 D (1)) The set pressure tolerance for pressure relief valves shall not exceed ±2 psi (15 kPa) for pressures up to and including 70 psi (500 kPa) and ±3% for pressures above 70 psi...

Dear Sir, when we conduct shop inspection, If any PSVs failed in the initial inspection (if it opens before the set pressure or failed in the leak test) , do we need to conduct investigation. Is it mentioned anywhere in API standards? If the PSV is stuck or not opening 150% above set pressure...

Dears Is it mentioned anywhere in the International Standards (ASME/API) that, don't use Grease or Molykote on PSV Internals and threads. If yes, can you pls share the same I have read on safety bulletins that special lubricants, which are exclusively made of Oxygen service can be used...

If the back pressure is more than 10% of set pressure, bellows design psv need to be used(instead of conventional design), such statement is available in any API or ASME standard? Can i have the paragraph reference.

Dears We have one ASME Section 1 Safety valve from Fukui Manufacturer, set pressure is 45 kg/cm2g. We are testing this PSV in Air test stand. Do we need to apply temperature correction factor for this valve to get the CDTP. Operating temperature is 370 °C. Valve Model: SL431-C2-M2(T) SL...

Dears, While selecting the psv test media, we need to consider the normal operating condition or relieving condition scenario. My understanding is we need to consider relieving condition. can we have your advice please. Is it mentioned in any international standard Thanks Nasim

Dears Can you please inform me, what are criteria to select the PSV spring material as “Tungsten “ Thanks Nasim

Dears Anyone can share me, in which paragraph states that, do not install Isolation valve on Section 1 Safety valves inlet, which is installed on Boiler / Furnace. Thanks Nasim

thread1203-479776 Refer to above thread1203-479776, Common reasons for Bellows failure , don1980 (Chemical) mentioned that " When the PSV goes though a single opening/closing cycle, the bellows may experience hundreds of compression cycles. So the key to preventing bellows failure is to prevent...

Dears I am working in Refinery & petrochemical company. As soon as we received any psv from any service(Like Hydrocarbon, Phenol, Cumene, Sour gas, Crude oil etc..)in the PSV shop for testing & calibration, our initial step in the shop is visual inspection as received condition. If there is no...

Dears Can you pls share me the common reasons for the Bellows failure in PSVs other than listed below. 1. If the PZV has been exposed to excessive backpressure(constant/variable) then the bellows will damage. 2. If the PZV starts to chatter (rapidly opening and closing), as well as flow...

Dears I need your advice for below query. In our plant Drum is protected by One PSV & One Rupture Disk. Can we install isolation valve before the Rupture Disk? It is allowed by code? We have another Drum protected by multiple PSVs & RDs, isolation valves are there, and there is no issue. We...

Dear Can you please inform me, whether the code is allowed to install PSV in horizontal position. If yes, is it possible to share me the procedure paragraph We noticed today that, one PSV was installed on the pump in horizontal position. Thanks Nasim

Dears Can you please explain me, what are the disadvantages, if we use Machine bolt with Nuts for PSV installation. Based on one project specifications, it is clearly mentioned, we must use Stud bolt with Nuts for Safety valve installation. Thanks...

Dears Can you please explain me what is the difference between Tank breather valve & Tank Rim vent valves? Thanks Nasim

Dears What is the calibration validity for the PSVs used in hydro test? As per Saudi Aramco procedure (SAES-A-004) it is 2 weeks for new construction projects & 3 months for maintenance operations. Such criteria is mentioned in any international standard? Find attached procedure snap shot...

Dears I need your advice pls. We have Air volume tank available in our plant & PSVs are available in each air volume tank. However, these are not yet added in our PM schedule. As per ASME code or API, is it mandatory that these air volume tank PSVs must be calibrated in every 3 year / 4...

Dear All As per Saudi Aramco procedure, downstream(outlet) isolation valve must keep open for spare PSVs? What is the reason behind this recommendation? If there are two PSVs installed in one drum, operation team will keep close the spare psvs inlet & outlet. However, as per procedure, spare...

Can you pls inform me the set pressure tolerance(while conducting the calibration in RV shop) for Tank breather valve is +/- 10% in any engineering units ( like psig, mmH20, millibar, pounds per square inch, ounces per square inch, or inches of water column…) For example, 1. Set pressure is 25...

Dear Sir I need your advice to calculate the CDTP(Cold Differential Test Pressure) for the Fulflo valve. Pls refer the attached data sheet. Set pressure is 7.03 Kg/cm2D (differential pressure) Constant superimposed back pressure is 18.47 Kg/cm2g Can you pls advice the CDTP? Is it 7.03 Kg/mc2g...