Happy new YEAR. Slight question about piping again please
Happy new YEAR. Slight question about piping again please
(OP)
If we have a system with stainless austenitic pipe work and it is catagory M asme B31,3. It will be low pressure like 2 bar. 3- 4 inch stainless. Must it have a welded connection or is it acceptable for others like grey lock etc?
I dont have my copy of ASME to refer to I am afraid.
I dont have my copy of ASME to refer to I am afraid.





RE: Happy new YEAR. Slight question about piping again please
Some company specific standards might require it though and it would seem to be a good idea, if feasible.
It is not permitted to be a system with severe cyclic stresses.
This section may be useful
M308 FLANGES, BLANKS, FLANGE FACINGS, AND
GASKETS
Paragraph 308.1 applies in its entirety.
M308.2 Specific Requirements for Metallic Flanges
Paragraph 308.2.4 does not apply [see para. M300(e)].
The following shall not be used:
(a) single-welded slip-on flanges
(b) expanded-joint flanges
(c) slip-on flanges used as lapped flanges unless the
requirements in para. 308.2.1(c) are met
(d) threaded metallic flanges, except those employing
lens rings or similar gaskets and those used in lined
pipe where the liner extends over the gasket face
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Happy new YEAR. Slight question about piping again please
High temp differences
RE: Happy new YEAR. Slight question about piping again please
But I have been told that the joints with 3 clamps are easier to take off than the ones with 2 clamps. Does anyone know why that is please or can you think of any other fittings that could be used rather than these I cant really think of anything else.
http://www.oceaneering.com/oceandocuments/brochure...
RE: Happy new YEAR. Slight question about piping again please
RE: Happy new YEAR. Slight question about piping again please
Maybe victaulic (or equal) system is much more economic.
RE: Happy new YEAR. Slight question about piping again please
I have worked with Victaulic a lot on a biofuel plant but didnt think it would be of use in this situation. Tell me if I am totally wrong though please:) Can you use them Cat M?
RE: Happy new YEAR. Slight question about piping again please
K308.4 Gaskets
Gaskets shall be selected so that the required seating
load is compatible with the flange rating and facing, the
strength of the flange, and its bolting. Materials shall
be suitable for the service conditions. Mode of gasket
failure shall be considered in gasket selection and joint
design.
RE: Happy new YEAR. Slight question about piping again please
RE: Happy new YEAR. Slight question about piping again please
RE: Happy new YEAR. Slight question about piping again please
Grayloc is a replacement for something like a metallic ring-type joint flange at classes 1500# and above. It offers very significant fire safety, but it can be leakage prone at low pressures and merely tightening the clamp bolts may not stop the leakage. The sealing ring in Grayloc is energized by internal pressure, rather like an o-ring. Using it at 2 barg is a bit like swatting a fly with a sledgehammer, but it is allowed in category M. You'd be served better by using 150# ASME B16.5 flanges with a suitable gasket material in my opinion. If you use a spiral wound gasket with graphite filler, assuming it is acceptable for your service conditions, the resulting joint will likely be more than adequate from a fire safety perspective.
RE: Happy new YEAR. Slight question about piping again please
Just because you can do something, doesn't mean it's a good idea.