FARRIS SAFETY VALVE MODEL NO. 1896M

[kpm21443]

I was looking on test certificates of FARRIS SAFETY VALVE MODEL NO. 1896M, which has bronze body, bonnet & SS stem, spring. Test certificates for body, bonnet & disc only provided by the manufacturer. That too, they have provided 3.1 certificate for body, bonnet & 2.1 certificate for disc. I could not find test certificate for stem & guide. This being safety valve, I am more concerned to get 3.1 certificates for stem, guide & spring. Also, 3.1 certificate for disc. Can any one suggest if my above argument is correct.

 

[The Obturator]

I would not expect 3.1 certificates for stem, guide and spring since they are not the primary pressure containing parts. Unless, you as the purchaser, specify up front that you require these, for whatever reason, don't expect them as part of standard supply. 3.1 certification is sometimes specified as an extra for the nozzle and disc since they are classed as the primary pressure containing parts (more so for European PED certification). The body and bonnet (+ cap is pressure containing and cast) is expected with 3.1 (as is a hydraulic pressure test on those parts including nozzle if cast). Basically if you don't ask for it, you don't get. Hope that helps.

Per ISO, only the term Safety Valve is used for all overpressure eventualities regardless of design.

 

[kpm21443]

Thanks avalveman, understood ur point. Can u advise if I can accept the valve without test certificate for stem & disc

 

[The Obturator]

The answer to your last comment depends entirely on you (the end user) and/or your plants inspection/regime policy. Generally, you would have had that brand of SRV delivered by a reputable ISO-9001/2 bearing company. That, along with the other certificates you mention you have received, should suffice. Personally, I would also be keen on the actual test certificates for set pressure, hydro of body and pneumatic shell test of joints. My concern here would be if the bronze body casting is not porous (and itself from a certified foundry) - in European PED, the (3rd party) foundry must also be certified. Hope that helps.

Per ISO, only the term Safety Valve is used for all overpressure eventualities regardless of design.