Hi
I am looking for assistance in justifying why a flange with a gasket sealing surface finish with approx 80 grooves/inch, roughly 63 micro inch should be acceptable for a spiral wound gasket in a process gas line (LNG plant). I do not know why the valve has this finish, it should be as per...
Hi,
I have a client who is requesting a 'Fire Safe Certificate' (API 6FA) for a gasket supplied as a spare part. I have explained that as a gasket cannot be tested in isolation, only as part of an assembly, that I am unable to supply such a certificate. However my customer is adamant and states...
We have performed weld repairs on a valve body cast in ASTM A216 WCB. The client is accepting the weld repair but is querying the length of time that PWHT was held at temperature. The casting has a max wall thickness of 60 - 70 mm but the casting was held at 620°C for 6 hours. The client...
Hi all,
The client is using odorised natural gas at 550 - 700 kPa to power a pneumatic style, spring return, piston actuator. However the requirement is to use an activated carbon filter on the vent to, presumably, make the air around the valve tolerable and allow any real leaks to be nasally...
Hi
Is anyone aware of a similar ASTM / ISO specification for steel to Australian Standard AS 2074 Grade L6B-1? Is there even an old British standard equivalent to AS 2074?
Application is a drive lever that is likely to be flogged using sledge hammers, therefore the impact strength is...
Hi
I am looking for any information about polyethylene slurry. We are looking to supply valves into this service and I would like to know about its physical properties and any experiences that anyone else has had in handling this product.
My brief web search has shown that it can become...
Is anyone aware of a test that can be performed to give a reliable indication as to whether the form of the material is in either the crystalline or amorphous state?
We use this material for seals in cryogenic applications and experienced a failure when using the crystalline form of the...
I appreciate that viton is NOT a suitable sealing elastomer in methanol service but what are the implications of using viton in produced water with, say, 11,000 ppm methanol? Is the effect the same - viz deterioration of the viton. IS there a concentration limit that viton will take and is there...
Hi
Anyone had experience in working with this fluid that they would care to share, specifically seal materials? I am aware of viton and EPDM being acceptable and Graphite and Ptfe definitely NOT. Any others? UHMWPE perhaps? Acetal (Delrin)?
Any pitfalls that we should be aware of?
Cheers.
This follows on from a couple of earlier threads:
Is there an actual difference between ISO 10474 and EN 10204 or are they identical. I have 10204 and seen the table from ISO 10474 describing the attributes of the various certificates and the wording is identical. Is the rest of the standard...
I am looking for any data or references concerning the use of HVOF applied Tungsten Carbide (or similar carbides) for use in high temperature applications (to +500°C).
The specific line media is magnesium chloride (assume dry), the application is a metal seated ball valve, the coating to be...
