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the difference in the gap would be a max of ~0.25".

thanks little inch. we have to follow a pipe fab spec that precludes springing the pipe into place, regardless of the magnitude.

thanks, I agree that the gripping strength of the facing is always a consideration!

good afternoon, I am wondering if there is a standard practice for flanged, cone type, temporary strainers for when they are removed post flush. Is the strainer replaced with a spacer and the two gaskets or perhaps is there a thicker gasket which would fill the resulting gap? thanks Mark

Gator, the ends of the fitting were properly counter-bored from the vendor in order to meet the Code required mismatch criteria.

We ordered standard B16.9 fittings but some of them came with a reduced ID. For example, an 8" - Schedule 160 tee. The nominal ID that we expected would be 6.813". What was supplied was a tee with an ID of 4.96". We did not find this out intil system flow testing. We were not getting the...

I would like to know if there is an industry standard or what a reasonable value would be for the ID roughness for a 38" 1.75" wall P11 forged and bored pipe. Is the value something I would have to specify to a supplier? thanks Mark

is it acceptable to weld a stainless steel thermowell into a carbon steel sockolet. This will result in a fillet weld between two dissimilar metals with coefficients of thermal expansion which differ by ~ 50%. thanks Mark

We specified and ordered elbows with the following description: 90 DEG LR ELBOW, S-40S, BE, ASTM A-403 GR WP304L, SMLS, B16.9 The vendor fabricated the elbows by bending S-80S pipe and then counter-bored the ends to match the S-40S connecting pipe. The vendor than stamped the elbows as being...

denlow60, can you tell me the source of the posted file xxx.pdf? thanks mark

I was under the impression that the B16.5 flange working pressures were absolute limits which could not be exceeded. However, looking at ASME III article NC-3000 section 3658.3 there are factors from 1.1 for Level B to 2.0 for Level D events. The section says that the pressure shall not exceed...

maybe I missed something, but if you calculate the required wall thickness of a pipe to be 0.360" (for example), including any allowances for threading or erosion, etc., you will not be able to order standard wall piping or .375 nominal wall pipe because the vendor is allowed to supply the pipe...

Thanks Rconner. I was looking at the 2001 edition. this is good to know since 2-3/4" nuts were already bought to the 563 standard.

Does anybody know when the AWWA C207 standard changed the bolting requirement from only mentioning A307 bolting to A307 bolting for Class B & D and A-193 bolting for Class E & F. also, AWWA C207-01 lists only A194 nuts regardless of the bolt material in lieu of what can be found in the A307...

Thanks, I got the link.

I am interested in seeing the article regarding the modeling of the grooved pipe coupling but I have been unable to find it. is there a link available you can post? thanks Mark

Thanks BigInch, but, are you saying that both flanges and the bolting should be specified as safety related material for this thru-bolted application? and, what about non thru-bolted, would one side have ASTM material flange and bolting and the other have ASME material for the flange and bolting?

The question has come up as to whether both flanges of a thru-bolted butterfly valve that also has a class change from B31.1 to ASME Section III should be ordered as ASME SA material or if the B31.1 side flange can be ordered as ASTM A material. I have attached a pic of the valve from the P&ID...

the pipe in question is 48" OD, 0.500" Nominal WALL / 0.490" Min. wall, ASTM A-691, GR 1.25% CR, CLASS 22 I did not do the vacuum calc, but I hear that the stiffener distance used was 100 feet. Perhaps we are too conservative using that distance but that is the value. so, the question still...

pipe with a D/T ratio of ~90 may be subject to vacuum conditions. The thickness is determined based on a selected stiffener distance. I plan to select B16.9 fittings which will have the typical under tolerance on thickness of 12.5%. In one instance the required min thickness for pressure is...