ASME B16 .5-2009

addition to the minimum flange thickness, tf. Classes400,600,900, 1500, and 2500 pipe flanges and companionflanges of fittings are regularly furnished with 7 mm(0.25 in.) raised face, which is in addition to the mini-mum flange thickness, tf.

6.4.2 Other Than Lapped Joints . For joints otherthan lapped joints, the requirements of paras. 6.4.2.1 and6.4.2.2 shall apply.

6.4.2.1 Raised Face and Tongue Face . In the caseof flanges having raised face, tongue, or male face, theminimum flange thickness, tf, shall be provided, andthen the raised face, tongue, or male face shall be addedthereto.

6.4.2.2 Grooves. For flanges that have a ring joint,groove, or female face, the minimum flange thicknessshall first be provided and then sufficient thicknessadded thereto so that the bottom of the ring joint groove,or the contact face of the groove or female face, is in thesame plane as the flange edge of a full thickness flange.

6.4.3 Lapped Joint Flanges . Lapped joint flangesshall be furnished with flat faces as illustrated in Tables8, 11, 14, 16, 18, 20, and 22 (Tables 11-8, II-11, 11-14, 11-16,11-18, 11-20, and 11-22 of Mandatory Appendix 11). Lapjoint stub ends shall be in accordance with Fig. 7 (Fig. 11-7of Mandatory Appendix II) and paras. 6.4.3.1 through6.4.3.3.

6.4.3.1 Raised Face . The finished thickness of thelap shall be no less than nominal pipe wall thickness.

6.4.3.2 Large Male and Female . The finishedheight of the male face shall be the greater of the wallthickness of the pipe used or 7 mm (0.25 in.). The thick-ness of lap that remains after machining the female faceshall be no less than the nominal wall thickness ofpipe used.

6.4.3.3 Tongue and Groove . The thickness of thelap remaining after machining the tongue or groove faceshall be no less than the nominal wall thickness of thepipe used.

6.4.3.4 Ring Joint . The thickness of the lapremaining after machining the ring groove shall be noless than the nominal wall thickness of pipe used.

6.4.3.5 Lap Joint Facing Outside Diameters. Theoutside diameters of the lap for ring joints are shownin Table 5 (Table 11-5 of Mandatory Appendix II), dimen-sion K. The outside diameters of laps for large female,large tongue and groove, and small tongue and grooveare shown in Table 4 (Table 11-5 of MandatoryAppendix II). Small male and female facings for lappedjoints are not covered by this Standard.

6.4.4 Blind Flanges . Blind flanges need not be facedin the center if, when this center part is raised, its diame-ter is at least 25 mm (1 in.) smaller than the inside

diameter of fittings of the corresponding pressure class,as given in Tables 9 and 12 (Tables F-9 and F-12) or25 mm (1 in.) smaller than the mating pipe inside diame-ter. When the center part is depressed, its diameter shallnot be greater than the inside diameter of the corres-ponding pressure class fittings, as given in Tables 9 and12 (Tables 11-12 of Mandatory Appendix II). Machiningof the depressed center is not required.

6.4.5 Flange Facing Finish . Flange facing finishesshall be in accordance with paras. 6.4.5.1 through 6.4.5.3,except that other finishes may be furnished byagreement between the user and the manufacturer. Thefinish of the gasket contact faces shall be judged byvisual comparison with Ra standards (see ASME B46.1)and not by instruments having stylus tracers and elec-tronic amplification.

6.4.5.1 Tongue and Groove and Small Male andFemale . The gasket contact surface finish shall notexceed 3.2 µm (125 µin.) roughness.

6.4.5.2 Ring joint . The side wall surface finish ofthe gasket groove shall not exceed 1.6 µm (63 pin.)roughness.

6.4.5.3 Other Flange Facings . Either a serratedconcentric or serrated spiral finish having a resultantsurface finish from 3.2 µm to 6.3 µm (125 µin. to 250 µin.)average roughness shall be furnished. The cutting toolemployed should have an approximate 1.5 mm (0.06 in.)or larger radius, and there should be from 1.8 grooves/mm through 2.2 grooves/mm (45 grooves/in. through55 grooves/in.).

6.4.6 Flange Facing Finish Imperfections . Imperfec-tions in the flange facing finish shall not exceed thedimensions shown in Table 3 (Table 11-3 of MandatoryAppendix II). A distance of at least four times the maxi-mum radial projection shall separate adjacent imperfec-tions. A radial projection shall be measured by thedifference between an outer radius and inner radiusencompassing the imperfection where the radii arestruck from the centerline of the bore. Imperfectionsless than half the depth of the serrations shall not beconsidered cause for rejection. Protrusions above theserrations are not permitted.

6.5 Flange Bolt Holes

Bolt holes are in multiples of four. Bolt holes shall beequally spaced, and pairs of bolt holes shall straddlefitting centerlines.

6.6 Bolting Bearing Surfaces

Flanges and flanged fittings shall have bearing sur-faces for bolting that are parallel to the flange face within1 deg. Any back facing or spot facing shall not reducethe flange thickness, tf, below the dimensions given inTables 8, 9, 11, 12, 14, 16, 18, 20, and 22 (Tables 11-8, 11-9,

10

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ASME B16 . 5-2009

where limits, maximum or minimum values, are speci-fied shall be rounded as defined in ASTM Practice E 29.This requires that an observed or calculated value shallbe rounded to the nearest unit in the last right-handdigit used for expressing the limit. The listing of decimaltolerances does not imply a particular method of mea-surement.

7.5 Welding End Flange Ends and Hubs

7.5.1 Outside Diameter. Required tolerances for thenominal outside diameter dimension A of Figs. 8 and 9(Figs. 11-8 and 11-9 of Mandatory Appendix II) of weldingends of welding neck flanges are as follows:

Size Tolerance

7.2 Center-to-Contact Surfaces and Center-to-EndTolerances

Required tolerances for various flanges and flangedfitting elements are as follows:

(a) Center-to-Contact Surfaces Other Than Ring Joint

Size Tolerance

NPS 5-10 ±1.0 mm (±0.03 in.)NPS >-12 ±1.5 mm (±0.06 in.)

(b) Center-to-End (Ring Joint)

Size Tolerance

NPS <-10 ±1.0 mm (±0.03 in.)NPS? 12 ±1.5 mm (±0.06 in.)

(c) Contact Surface-to-Contact Surface Other Than RingJoint

Size Tolerance

NPS <-10 ±2.0 mm (±0.06 in.)NPS ? 12 ±3.0 mm (±0.12 in.)

(d) End-to-End (Ring Joint)

Size Tolerance

NPS 5-10 ±2.0 mm (±0.06 in.)NPS ? 12 ±3.0 mm (±0.12 in.)

7.3 Facings

Required tolerances for various flange and flangedfitting facings are as follows:

(a) Inside and outside diameter of large and smalltongue and groove and female, ±0.5 mm (±0.02 in.).

(b) Outside diameter, 2.0 mm (0.06 in.) raised face,±1.0 mm (±0.03 in.).

(c) Outside diameter, 7.0 mm (0.25 in.) raised face,±0.5 mm (±0.02 in.).

(d) Ring joint groove tolerances are shown in Table 5(Table 11-5 of Mandatory Appendix II).

7.4 Flange Thickness

Required tolerances for flange thickness are as follows:

Size Tolerance

NPS 5 18 +3.0, -0.0 mm (+0.12, -0.0 in.)NPS ? 20 +5.0, -0.0 mm (+0.19, -0.0 in.)

The plus tolerance is applicable to bolting bearingsurfaces whether as-forged, as-cast, spot-faced, or back-faced (see para. 6.6).

NPS 5- 5 +2.0, -1.0 mm (+0.09, -0.03 in.)NPS >- 6 +4.0, -1.0 mm (+0.16, -0.03 in.)

7.5.2 Inside Diameter . Required tolerances for thenominal inside diameter of welding ends of weldingneck flanges and smaller bore of socket welding flanges(dimension B in the referenced figures) are as follows:

(a) For Figs. 8 and 9 (Figs. 11-8 and 11-9 of MandatoryAppendix II) and Fig. 15, the tolerances are

Size Tolerance

NPS <<-10 ±1.0 mm (±0.03 in.)12 5- NPS <-18 ±1.5 mm (±0.06 in.)NPS >- 20 +3.0, -1.5 mm (+0.12, -0.06 in.)

(b) For Fig. 10 (Fig. 11-10 of Mandatory Appendix II),the tolerances are

Size Tolerance

NPS 5-10 +0.0, -1.0 mm (+0.0, -0.03 in.)NPS >-12 +0.0, -1.5 mm (+0.0, -0.06 in.)

7.5.3 Backing Ring Contact Surface . Required toler-ances for the bore of the backing ring contact surface ofwelding neck flanges, dimension C of Figs. 10 and 11(Figs. 11-10 and II-11 of Mandatory Appendix II) are asfollows:

Size Tolerance

2!5 NPS <- 24 +0.25, -0.0 mm (+ 0.01, -0.0 in.)

7.5.4 Hub Thickness . Despite the tolerances speci-fied for dimensions A and B, the thickness of the hubat the welding end shall not be less than 871/2% of thenominal thickness of the pipe, having an under-toleranceof 12.5% for the pipe wall thickness to which the flangeis to be attached or the minimum wall thickness as speci-fied by the purchaser.

7.6 Length Through Hub on Welding Neck Flanges

The required tolerances for the length through hubson welding neck flanges are as follows:

Size Tolerance

NPS 5- 4 ±1.5 mm (±0.06 in.)5<- NPS 5510 +1.5, -3.0 mm (+0.06, -0.12 in.)NPS? 12 +3.0, -5.0 mm (+0.12, -0.18 in.)

7.7 Flange Bore Diameter

7.7.1 Lapped and Slip - On Flange Bores. Therequired tolerances for lapped and slip-on flange borediameters are as follows:

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ASME B16 . 5-2009

Table 18 Dimensions of Class 900 Flanges< X[Note (1)]- -

E 0 -I

0Threaded

0

^Lwffl/ffim^lBlind

tf J

X[Note (1)] --- *-]B-,^ I

r

Lapped

B

^21....... - o --

Slip-On Welding

i.

-- 0

Welding Neck

Table 18 Dimensions of Class 900 Flanges (Cont'd)

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Hub Diam. Minimum CornerBeginning Thread Bore

Outside of Chamfer Len th R di f Mi iLength Through Hubg

Borea us o n mum

Nom. Diam. Min. Diam . Welding Threaded La ed CounterborePipe of Thickness of Neck, Threaded/ Welding Flange , Min. Min. Welding

pp

Flange ThreadedSize, Flange , of Flange, Hub, Ah Slip-On, Lapped, Neck , T Slip-On, Lapped, Neck , and Pipe, Flange,NPS 0 tf x [Note (2)] Y Y Y [Note (3)] B B B r Q

1123/4

1

11/4 Use Class 1500 dimensions in these sizes [ Note (4)]1112

2

21/2

3 240 38.1 127 88.9 54 54 102 42 90. 7 91.4 Note (5) 10 92.24 290 44.5 159 114.3 70 70 114 48 116 .1 116.8 Note (5) 11 117.6

5 350 50.8 190 141.3 79 79 127 54 143.8 144 .4 Note (5) 11 144.46 380 55.6 235 168.3 86 86 140 58 170.7 171. 4 Note (5) 13 171.48 470 63.5 298 219.1 102 114 162 64 221.5 222.2 Note (5) 13 222.2

10 545 69.9 368 273.0 108 127 184 72 276.2 277. 4 Note (5) 13 276.212 610 79.4 419 323.8 117 143 200 77 327.0 328. 2 Note (5) 13 328.6

14 640 85.8 451 355.6 130 156 213 83 359.2 360. 2 Note (5) 13 360.416 705 88.9 508 406.4 133 165 216 86 410.5 411 .2 Note (5) 13 411.218 785 101.6 565 457.0 152 190 229 89 461 .8 462. 3 Note (5) 13 462.020 855 108 .0 622 508.0 159 210 248 93 513.1 514. 4 Note (5) 13 512.824 1,040 139.7 749 610.0 203 267 292 102 616.0 616. 0 Note (5) 13 614.4

95

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