B16.5 Flange Thickness Deviation

ASME B16.5 - 2009 POINT 6 DIMENSIONS

6.1.1 Minimum Wall Thickness. For inspection purposes,

the minimumwall thickness, tm, of flanged fittings

at the time of manufacture shall be as shown in Tables 9

and 12 (Tables II-9 and II-12 of Mandatory Appendix II),

except as provided in para. 6.1.2. The additional metal

thickness needed to withstand installation bolt-up

assembly stresses, shapes other than circular, and stress

concentrations must be determined by the manufacturer,

since these factors vary widely. In particular, 45-deg

laterals, true Ys, and crosses may require additional reinforcement

to compensate for inherent weaknesses in.................

7.4 Flange Thickness

Required tolerances for flange thickness are as follows:

Size Tolerance

NPS ≤ 18 +3.0, −0.0 mm (+0.12, −0.0 in.)

NPS ≥ 20 +5.0, −0.0 mm (+0.19, −0.0 in.)

NPS ≤ 10 +1.0, −0.0 mm (+0.03, −0.0 in.)

NPS ≥ 12 +1.5, −0.0 mm (+ 0.06, −0.0 in.)

Whitephone; Thanks for the reply. the dimensions was undersized in the lower limit... there is no tolerance limit in the negative end.. is the right thing if we have used flange fittings clauses for valve flanges???? Please guide me....

It must be certified by the manufacturer for intended use....

Yes, The criteria is similar

ASME B16. 47 (Large diameters)

7.2 Flange Thickness

Required tolerances for flange thickness, tf, are as

follows:

Flange Thickness, tf Tolerances

tf ≤ 25 mm (1.0 in.) +3.0 mm, −0.0 mm

(+0.12 in., −0.00 in.)

25 mm (1.0 in.) < tf ≤ 50 mm (2.0 in.) +5.0 mm, −0.0 mm

(+0.19 in., −0.00 in.)

50 mm (2.0 in.) < tf ≤ 75 mm (3.0 in.) +8.0 mm, −0.0 mm

(+0.31 in., −0.00 in.)

tf > 75 mm (3.0 in.) +10.0 mm, −0.0 mm

(+0.38 in., −0.00 in.)

AND

B16.5 (NPS 1/2 Through NPS 24)

Required tolerances for flange thickness are as follows:

Size Tolerance

NPS ≤ 18 +3.0, −0.0 mm (+0.12, −0.0 in.)

NPS ≥ 20 +5.0, −0.0 mm (+0.19, −0.0 in.)

NPS ≤ 10 +1.0, −0.0 mm (+0.03, −0.0 in.)

NPS ≥ 12 +1.5, −0.0 mm (+ 0.06, −0.0 in.)

I suggest you to take a look in these standards.

It's all about risk. In deviating from the standard, the risk transfers from the insurers that expect compliance to the standard, to the deviant.

This is the domain of the Loss Adjuster. The role of this occupation is to adjust the insurance company's loss downwards.

NO. You cannot slide around the standards just by asking.