Bolts for removing stucked blinds
Bolts for removing stucked blinds
(OP)
Hi,
One of our customers wants "jack screws"(how they call but i am not sure that is the correct wording for.)on blind flanges of an U stamped PV. Blinds are varying 3" to 30" and all CL900(RTJ). But they don't provide any details except attached sample.
If i understand correctly, these bolts used to losen stucked blinds easly.
I'm not able to find any info about sizing and placing of these bolts on books, spesifications, google etc. So here is my last resort. Also i want to know, whether drilling these holes is a violation of the code(Asme B16.5 or BPVC)or not.
Any information will be extremely hepful,
http:/ /files.eng ineering.c om/getfile .aspx?fold er=2271e07 b-f3a5-416 1-9d82-8bf 5cdfabb61& amp;file=J ack_Screw_ Detail.PNG
One of our customers wants "jack screws"(how they call but i am not sure that is the correct wording for.)on blind flanges of an U stamped PV. Blinds are varying 3" to 30" and all CL900(RTJ). But they don't provide any details except attached sample.
If i understand correctly, these bolts used to losen stucked blinds easly.
I'm not able to find any info about sizing and placing of these bolts on books, spesifications, google etc. So here is my last resort. Also i want to know, whether drilling these holes is a violation of the code(Asme B16.5 or BPVC)or not.
Any information will be extremely hepful,
http:/





RE: Bolts for removing stucked blinds
Jack bolts are normally used to separate flanges when you want to swing spectacle plates or when you want to change spec blinds out. They are normally used on the larger size pipes where "breaking" the flange joint takes more effort. On smaller lines 1" to say 12" they are rare.
RE: Bolts for removing stucked blinds
Jack Screws are common on Orifice Flanges. If you want to see what they are, where to place them, the proper size "Jack Screw" for a given flange size, etc. then pull out an Orifice Flange catalog and look for the one that fits your situation.
RE: Bolts for removing stucked blinds
RE: Bolts for removing stucked blinds
One thing that I've found that for larger blind flanges the weight of the flange is generally enough to break any seal. Some times it might take a little nudge with a 4 pound hammer.
I don't recall ever seeing any prohibition of using them in a flange. You can have as many bolt Holt holes as you want as long as the flange will calculate out for the conditions.