What Are ASME/ANSI B16.9 Fittings?
ASME/ANSI B16.9 fittings standard specification are cover only the butt weld fittings. That are followed to connect pipes with other fittings components in industrial piping systems. These fittings are made from a wide variety of materials, like carbon steel, stainless steel, alloy steels, nickel alloys, and titanium for high-temperature applications. The specifications set out by ASME/ANSI B16.9 outline the dimensional and pressure requirements for these fittings.
The ASME/ANSI B16.9 fitting specification outlines standards for butt weld fittings, which are used to connect piping systems in industrial applications. With an understanding of this standard, you can ensure accuracy and safety in your piping system design.
Dimensions for 45 and 90 Degrees Elbows in Long Radius and Short Radius
When using ASME/ANSI B16.9 fittings, it is important to be aware of the dimensional requirements for both 45 degree and 90 degree elbows in a long radius or short radius. For 45° elbows in long radius form, the outside diameter of the fitting must be between 1.25 and 24 inches, with a maximum center-to-end distance of 2 times the nominal size of the pipe. For 90° elbows in short radius form, this outside diameter should also be between 1.25 and 24 inches, but with a center-to-end distance that is equal to the nominal size of the pipe.
Dimensions of Straight Tees, Reducing Tees, Caps, Olets and Outlets
That standard specification also covers straight tees and other fittings that are available in diameters ranging from 1.25 to 24 inches, with the center-to-end distance of its run pipe equal to its nominal size. Reducing tees must have a run pipe with an outside diameter no greater than that of its branch pipe, also with a maximum center-to-end distance equal to the nominal size. Caps fittings have an outside diameter that is between 1.25 and 24 inches, while olets and outlets must have a minimum outside diameter of 3/4 inch and a maximum overall length of 6 times the fitting’s outside diameter.
Manufacturers Standardization Society (MSS) Standard
It is important to reference MSS SP-44 when buying standard size fittings, as it outlines the various dimensions used to fit pipes. The inner outside diameter (ID) and outer outside diameter (OD) of a fitting’s ends must match the nominal pipe size’s ID and OD respectively. For example, the most common ID measurement for a 1/2 inch fitting is 0.531 inches with an OD of 0.8438 inches. Additionally, socket weld fittings must conform to the requirements of ANSI B16.11 which specifies the pressure classes and overall length of each product type.
Impact of
Errata on Document Quality & Compliance
Errata are changes to ASME/ANSI B16.9 documents that can impact product quality and compliance standards. Errata should be taken into consideration when it comes to ordering, purchasing, or installing fittings. Types of errors include corrections, additions and deletions. Be sure to check the issuing date of the document and any publication errors that have been issued since the document was released in order to ensure you have accurate information.
Dimensions chart for 45 and 90 Degrees Elbows
45 and 90 Degrees Elbows Terms
90 DEGREES LONG RADIUS ELBOW CENTER-TO-END – (A)
45 DEGREES LONG RADIUS ELBOW CENTER-TO-END – (B)
90 DEGREES 3D ELBOW CENTER-TO-END – (A)
45 DEGREES 3D ELBOW CENTER-TO-END- (B)
THREADS ON BOTH ENDS (TBE)
NOMINAL PIPE SIZE (NPS)
WALL THICKNESS (WT)
OUTSIDE DIAMETER (OD)
INNER DIAMETER (ID)
WALL THICKNESS (WT)
NPS
NB (MM)
O.D (
D)
90° LR
(A)
45° LR
(B)
90° 3D
(A)
45° 3D
(B)
1/2″
15mm
21.3
38
16
3/4″
20mm
26.7
38
19
57
24
1″
25mm
33.4
38
22
76
31
1 1/4″
32mm
42.2
48
25
95
39
1 1/2″
40mm
48.3
57
29
114
47
1 2″
50mm
60.3
76
35
152
63
2 1/2″
65mm
73
95
44
190
79
3″
80mm
88.9
114
51
229
95
3.1/2″
87.5mm
101.6
133
57
267
111
4″
100mm
114.3
152
64
305
127
5″
125mm
141.3
190
79
381
157
6″
150mm
168.3
229
95
457
189
8″
200mm
219.1
305
127
610
252
10″
250mm
273
381
159
762
316
12″
300mm
323.8
457
190
914
378
14″
350mm
355.6
533
222
1067
441
16″
400mm
406.4
610
254
1219
505
18″
450mm
457
686
286
1372
568
20″
500mm
508
762
318
1524
632
22″
550mm
559
838
343
1676
694
24″
600mm
610
914
381
1829
757
26″
650mm
660
991
406
1981
821
28″
700mm
711
1067
438
2134
883
30″
750mm
762
1143
470
2286
946
32″
800mm
813
1219
502
2438
1010
34″
850mm
864
1295
533
2591
1073
36″
900mm
914
1372
565
2743
1135
38″
950mm
965
1448
600
2896
1200
40″
1000mm
1016
1524
632
3048
1264
42″
1050mm
1067
1600
660
3200
1326
44″
1100mm
1118
1676
695
3353
1389
46″
1150mm
1168
1753
727
3505
1453
48″
1200mm
1219
1829
759
3658
1516
Some other dimension chart given below
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