Thanks Matt ..
But still i find myself not clear with the resaon for non operable valves (ie non extended bonnet) in shell mesc .. Even though the temp is below -40 deg centigrade ..
My understanding is that Normally valves in low temperature service should be given a extended bonnet inorder to...
Dear all,
In certain Low temperature and cryogenic applications ,shell specifies valve bonnet to be non extended.. to be more specific it states the valves to be non operable valves (ref shell MESC 77/200).
what are the service or requirements to go for these valves..
Thanks in Advance...
bereng
As stated by others generally for all threaded & socket end connection the end to end dimension are as per the manufacturers so the end to end dimension varies slightly from vendor to vendor
Regarding your query on end connection for the threaded valves ASME 16.11 covers the...
GOBLINTECHNIC
I think its not possible to exactly determine the
degree of thinning. However, it can be approximated by multiplying the thickness before bending by the ratio:
R/R+r
where r the radius of the pipe
R the radius of the bend
sendel kumar
ManuOrb
i have just refered the Std API 609 where these lines where mentioned for testing the electrical continuity ....
When specified in the purchase order, valves shall incorporate
an electrostatic feature that ensures electrical continuity
between the shaft and the body or the shaft...
acewee
can you just confirm me what rings you are mentioning here. if its seat ring just go through the Attached file .
sendel kumarhttp://files.engineering.com/getfile.aspx?folder=009a4e44-e7f9-46b4-a0ec-3a0273443ffc&file=Picture1.JPG
iam answering for your second part of the question first , the allowable stress value of ASME Sec II PART differs from b31.3 coz the factor of safety differs in both the case the factor of safety is higher 4 incase of ASME sec II and 3 incase of 31.3, ASME Sec II is generally refered for ASME...
sorry i dont know the problem with the file just try this one ..http://files.engineering.com/getfile.aspx?folder=b013e948-4e32-4bcf-9093-71e027cdf1c2&file=CASTING.doc
i think this page may clear your idea...
http://files.engineering.com/getfile.aspx?folder=9aec5a3f-07e6-4f54-b56b-63ed5bc24a30&file=castin_&_forging.JPG
Normally for small bore valves the Vendor provide us the 13cr%+stellited(hard facing) , but as the size increases the vendor cant afford to give 13%Cr and stellite disc .
he will either provide 13%CR plated with the WCB material or WCB + stellited upon requirement.
for your Info the...
if you are asking for butterfly valve the face to face to dimension can be as per API 609 catB/ASME 16.10( long pattern) or API 609 catB/ISO 5752( Short pattern),
The face to face dimension for other valves will be as per ASME 16.10.
i think i have cleared for your query.
