Pipe Flanges

[beerginger]

does anybody know what table D, table E etc and ANSI 300, ANSI 600 means in regards to pipe flanges. I believe that they refer to the pressure rating...

 

[LSThill]

beerginger (Mechanical)


You need to have a copy of ASME B16.5-2003 CONTACT ASME.ORG


ASME B165. 2003

ANNEX D
METHOD FOR CALCULATING BOLT LENGTHS (1.2)

F = total height of facings or depth of ring joint groove for both flanges (see Table D1)

LST

 

[katmar]

Yes, they are basically pressure ratings, but the allowable pressures depend on the temperature as well. You should find details easily in a mech eng handbook, or Perry's chem eng handbook. Many pipe fitting catalogs include sizes and pressure ratings.

BTW, Table D, E etc is from the old British Standard BS 10 which is basically obsolete, although you can still buy them for compatibility with existing equipment. On a new installation rather use BS 4504 or ANSI standards.

 

[BarryEng]

Table C, D etc did come originally from BS10, 1947 Part 2 & was used by water utilities. Working pressures were 100 ft for Table A, 200 ft for Table B, 400 ft for Table C etc. The most used Table for water utilities was Table C.

In Australia, the flange table was AS 2129 & originally had soft conversions for the metric version. This was rationalized several years ago & the current flanges are Table A - 170 kPa, Table D - 700 kPa, Table E - 1400 kPa, Table F - 2100 kPa, Table H - 3500 kPa, etc. The most used table for the water utility industry (Table C) was taken out.

After the rationalization, the water utility industry then developed their own standard (AS 4087) with only three pressure ratings (for the water industry in Australia).

Barry

 

[Cockroach]

ANSI Class 150, 300, 400, 600, 900, 1500 and 2500 are the flange pressure rating in accordance with Table 2.1 of API 6D Specification. As outlined above, pressure ratings decrease with rising thermal conditions.

The pressure rating is considered to be the "MOP" or maximum operational pressure for a given piece of equipment. "MTP" is the allowable maximum test pressure, understood in the oil industry to be 50% above MOP.

Since you're probably in the imperal system, for a temperature condition between -20F to 100F, the above specification relative to the given pressure classifications correspond to 275, 720, 960, 1440, 2160, 3600 and 6000 psi respectively.

So now you know.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada