ASME B16.5-2009

Fig. 1 Method of Designating Location of Auxiliary Connections When Specified(Flanged Fittings)

GENERAL NOTE: The above sketches show views of the same fitting and represent fittings with symmetrical shapes, with the exception of

the side outlet elbow and side outlet tee (straight sizes). Sketches are illustrative only and do not imply required design (see para. 6.12).

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ASME B16.5-2009

Fig. 2 Method of Designating Outlets of Reducing Fittings in Specifications(Flanged Fittings)

GENERAL NOTES:

(a) The largest opening establishes the basic size of a reducing fitting. The largest opening is named first, except that for bull head tees,

which are reducing on both runs, and for double branch elbows where both branches are reducing, the outlet is the largest opening

and named last in both cases.

(b) In designating the openings of reducing fittings, they should be read in the order indicated by the sequence of the letters A, B, C, and

D. In designating the outlets of side outlet reducing fittings, the side outlet is named last, and in the case of the cross, which is not

shown, the side outlet is designated by the Letter E.

(c) Sketches are illustrative only and do not imply required design (see para. 3.2).

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ASME B16.5-2009

Size Tolerance

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

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

7.7.2 Counterbores, Threaded Flanges. The requiredtolerances for threaded flange counterbores are asfollows:

Size Tolerance

NPS 10 +1.0, −0.0 mm (+0.03, −0.0 in.)NPS 12 +1.5, −0.0 mm (+0.06, −0.0 in.)

7.7.3 Counterbores, Socket Welding Flanges. Therequired tolerance for socket end counterbores is asfollows:

Size Tolerance

1⁄2 NPS 3 ±0.25 mm (±0.010 in.)

7.8 Drilling and Facing

7.8.1 Bolt Circle Diameter. The required tolerancefor all bolt circle diameters is as follows:

±1.5 mm (±0.06 in.)

7.8.2 Bolt Hole to Bolt Hole. The required tolerancefor the center-to-center of adjacent bolt holes is asfollows:

±0.8 mm (±0.03 in.)

7.8.3 Bolt Circle Concentricity. The required toler-ances for concentricity between the flange bolt circlediameter and machined facing diameters are as follows:

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Size Tolerance

NPS 21⁄2 0.8 mm (0.03 in.)NPS 3 1.5 mm (0.06 in.)

8 PRESSURE TESTING

8.1 Flange Test

Flanges are not required to be pressure tested.

8.2 Flanged Fitting Test

8.2.1 Shell Pressure Test. Each flanged fitting shallbe given a shell pressure test.

8.2.2 Test Conditions. The shell pressure test forflanged fittings shall be at a pressure no less than 1.5times the 38°C (100°F) pressure rating rounded off tothe next higher 1 bar (25 psi) increment.

8.2.3 Test Fluid. The pressure test shall be madeusing water, which may contain a corrosion inhibitor orkerosene as the test fluid. Other suitable test fluids maybe used provided their viscosity is no greater than thatof water. The test fluid temperature shall not exceed50°C (125°F).

8.2.4 Test Duration. The test duration shall be asfollows:

Fitting Size Duration, sec

NPS 2 6021⁄2 NPS 8 120NPS 10 180

8.2.5 Acceptance. No visible leakage is permittedthrough the pressure boundary wall.