Fire safe testing of HP BFV
Fire safe testing of HP BFV
(OP)
Our company wants to let an institute (SwRi) to perform a fire safe test according to API 607 and BS 6755 on our high performance butterfly valve. I have to prepare the test valves. They have to be deliverd installed between pipe.
My Question is: "How do i get the flanges tight?"
During test the bolts will extend stronger due expore to fire then the flanges/valve body. When lekkage (along the flange) occurs the test is considerd "failed" and shall be stopped. Gone $3000 per valve.
Who has dealed with this issue before and please answer ASAP.
Many thanks in forward.
Marco
My Question is: "How do i get the flanges tight?"
During test the bolts will extend stronger due expore to fire then the flanges/valve body. When lekkage (along the flange) occurs the test is considerd "failed" and shall be stopped. Gone $3000 per valve.
Who has dealed with this issue before and please answer ASAP.
Many thanks in forward.
Marco





RE: Fire safe testing of HP BFV
RE: Fire safe testing of HP BFV
of course end flange leakage must be avoided; but if this occurs, in my opinion, it should not be considered as a VALVE failure. In fact, according to API 607 (see para. 4.2.1), this event cannot be classified as an “external leakage” of the valve, but it must be assimilated to a “leakage at the piping-to-valve end connections”.
Anyway, what is the material of the valve body?
If it is stainless steel, for example, one my Colleagues (our "Metals Expert") would suggest bolts in ASTM A453 Grade 660, Class A or B (see the relevant standard, named "Standard Specification for High temperature Bolting Materials, with Expansion Coefficients Comparable to Austenitic Stainless Steels").
Alternatives: Inconel 625 or Grade B16.
Hope this helps, 'NGL
RE: Fire safe testing of HP BFV
John
RE: Fire safe testing of HP BFV
RE: Fire safe testing of HP BFV
Welding the pipes to the valve is a sollution but takes so much time.
We have in the pas used Belleville washers on the flange bolting (many) to make sure that a compressive force remains on the end flanges. Works fine.
Best regards.
Scalleke
RE: Fire safe testing of HP BFV