Dear members,
As a piping design engineer I am quite familiar with EN, ASME and MSS standards. By regularly checking this site you will see how technical issues are compared with the rules of the Codes and Standards. I know the comments of many MPVs (member of the Eng-Tips forums round table), but what does MPV mean?
STD, XS & XXS come from the IPS system and the schedules appear in the NPS system. Also in the ASME B36.10M, STD, XS & XXS are in the Identification column and not the schedule column, which is why I do not give it the abbreviation SCH. So SCH XS becomes XS.
I got the following descriptions from this forum. The second rule is according to the metrication and then the emphasis is on the nominal designation. The most important items are named and placed chronologically.
1--PIPE, 1.5” OD X 0.109” WT, SMLS, SCH XS, ASME B36.10, ASTM A106-B, Ends beveled 30º
2--PIPE SMLS, BE, NPS 1 1/2, XS, ASTM A106-B, ASME B36.10M
1--ELBOW, 12.75” OD, 90º LR, WE, 0.688” WT, ASME B16.9, CS ASTM A-234 WPB
2--ELBOW 90º LR, BW, NPS 12, SCH 80, ASTM A-234 WPB, ASME B16.9
1--REDUCER, 12.75” OD X 8.625” OD, WE, 0.688” WT, 8” X 0.500” WT, ASME B16.9, CS ASTM A-234 WPB
2--REDUCER CONC, BW, NPS 12 x 8, SCH 80 x SCH 80, ASTM A-234 WPB, ASME B16.9
1--FLANGE 8.625” OD X 0.375” WT, RFWN, ASTM A-105 B
2--FLANGE WN, RF, NPS 8, 0.375” WT, ASTM A-105 B, ASME B16.5
or
2--FLANGE WN, RF, NPS 8, CL 150, BORE 7.875”, ASTM A-105 B, ASME B16.5
The following descriptions come from a 3D CAD design catalog;
PIPE SMLS, BE, 100mm ND, SCH 120, ASTM A106
REDUCER CONC, BW, 65mmX40mm ND, ASME B16.9
They do not meet the objective of metrication. The design engineers then have to choose from;
2 1/2 x 1 1/2 REDUCER CONC, BW, 65mmX40mm ND, ASME B16.9
But according to B16.9 this should be;
2 1/2 x 1 1/2 REDUCER CONC, BW, DN 65 X 40, ASME B16.9
The size 2 1/2 x 1 1/2 is the NPS notation and the description is linked to it. This will be included in the MTO. So there are two unit systems together.
According ASME B16.9 para. 1.4-relevant units; Combining values from the two systems constites nonconformance with the standard. The designation for the size is NPS for both Metric- and Customary-dimensioned fittings
I would rather see;
2 1/2 x 1 1/2 REDUCER CONC, BW, NPS 2 1/2 x 1 1/2, ASME B16.9
BE–Beveled end, BW–Butt weld, PE–Plain end, WE–Weld end
How should you handle butt joints and what additional information does this abbreviation provide? Or does the type of welding method also play a role? In most cases I see that PE or BE is used for pipe and BW for fittings. You can use Plain end (PE) for socket weld and the weld ends are still pre-processed in the pipe shop. Do these abbreviations provide extra usefull information?
For this post I read a lot about metrication and I think it is a good point for calculations in the SI system. Metrification is not mandatory, monetary costs, conversiefactor inch & mm, world of piping design is conservative. So, in my view, economics and the conversion factor are the problem.
Why do you have to put such a large (piping) system of the U.S. Customary system, which is also well known in Europe, in a metric form? I don't think it has become any clearer and that is why I am asking the MPVs for a second opinion.
1-How is metrication (excluding calculations) experienced among piping engineers?
(i.e. how is the expression or name perceived)
2-Why are ASME dimensional standards often not included in the description?
3-Do the abbreviations BW, BE, etc. provide additional useful information and if so, how to classify?
Regards,
Piline
As a piping design engineer I am quite familiar with EN, ASME and MSS standards. By regularly checking this site you will see how technical issues are compared with the rules of the Codes and Standards. I know the comments of many MPVs (member of the Eng-Tips forums round table), but what does MPV mean?
STD, XS & XXS come from the IPS system and the schedules appear in the NPS system. Also in the ASME B36.10M, STD, XS & XXS are in the Identification column and not the schedule column, which is why I do not give it the abbreviation SCH. So SCH XS becomes XS.
I got the following descriptions from this forum. The second rule is according to the metrication and then the emphasis is on the nominal designation. The most important items are named and placed chronologically.
1--PIPE, 1.5” OD X 0.109” WT, SMLS, SCH XS, ASME B36.10, ASTM A106-B, Ends beveled 30º
2--PIPE SMLS, BE, NPS 1 1/2, XS, ASTM A106-B, ASME B36.10M
1--ELBOW, 12.75” OD, 90º LR, WE, 0.688” WT, ASME B16.9, CS ASTM A-234 WPB
2--ELBOW 90º LR, BW, NPS 12, SCH 80, ASTM A-234 WPB, ASME B16.9
1--REDUCER, 12.75” OD X 8.625” OD, WE, 0.688” WT, 8” X 0.500” WT, ASME B16.9, CS ASTM A-234 WPB
2--REDUCER CONC, BW, NPS 12 x 8, SCH 80 x SCH 80, ASTM A-234 WPB, ASME B16.9
1--FLANGE 8.625” OD X 0.375” WT, RFWN, ASTM A-105 B
2--FLANGE WN, RF, NPS 8, 0.375” WT, ASTM A-105 B, ASME B16.5
or
2--FLANGE WN, RF, NPS 8, CL 150, BORE 7.875”, ASTM A-105 B, ASME B16.5
The following descriptions come from a 3D CAD design catalog;
PIPE SMLS, BE, 100mm ND, SCH 120, ASTM A106
REDUCER CONC, BW, 65mmX40mm ND, ASME B16.9
They do not meet the objective of metrication. The design engineers then have to choose from;
2 1/2 x 1 1/2 REDUCER CONC, BW, 65mmX40mm ND, ASME B16.9
But according to B16.9 this should be;
2 1/2 x 1 1/2 REDUCER CONC, BW, DN 65 X 40, ASME B16.9
The size 2 1/2 x 1 1/2 is the NPS notation and the description is linked to it. This will be included in the MTO. So there are two unit systems together.
According ASME B16.9 para. 1.4-relevant units; Combining values from the two systems constites nonconformance with the standard. The designation for the size is NPS for both Metric- and Customary-dimensioned fittings
I would rather see;
2 1/2 x 1 1/2 REDUCER CONC, BW, NPS 2 1/2 x 1 1/2, ASME B16.9
BE–Beveled end, BW–Butt weld, PE–Plain end, WE–Weld end
How should you handle butt joints and what additional information does this abbreviation provide? Or does the type of welding method also play a role? In most cases I see that PE or BE is used for pipe and BW for fittings. You can use Plain end (PE) for socket weld and the weld ends are still pre-processed in the pipe shop. Do these abbreviations provide extra usefull information?
For this post I read a lot about metrication and I think it is a good point for calculations in the SI system. Metrification is not mandatory, monetary costs, conversiefactor inch & mm, world of piping design is conservative. So, in my view, economics and the conversion factor are the problem.
Why do you have to put such a large (piping) system of the U.S. Customary system, which is also well known in Europe, in a metric form? I don't think it has become any clearer and that is why I am asking the MPVs for a second opinion.
1-How is metrication (excluding calculations) experienced among piping engineers?
(i.e. how is the expression or name perceived)
2-Why are ASME dimensional standards often not included in the description?
3-Do the abbreviations BW, BE, etc. provide additional useful information and if so, how to classify?
Regards,
Piline