ASME B16.5 Standard-Pipe Flanges and Flanged Fittings( NPS 1/2 Through NPS 24 Metric/ Inch Standard) Pressure Testing

openings for pipe flanges and flanged fittings.

Haihao Group forged flanges engineering department,design,produce,inspect and supply our forged flanges according to the ASME B16.5 standard.

ASME B16.5 Standard – Pipe Flanges and Flanged Fittings(NPS 1/2 Through NPS 24 Metric/Inch Standard)

ANSI ASME B16.5 ASTM A105 RF SO flanges slip on flanges

ANSI ASME B16.5 ASTM A105 RF SO flanges slip on flanges


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 shall be given a shell pressure test.

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

8.2.3 Test Fluid. The pressure test shall be made using water, which may contain a corrosion inhibitor or kerosene as the test fluid. Other suitable test fluids may be used provided their viscosity is no greater than that of water. The test fluid temperature shall not exceed 50°C (125°F).

8.2.4 Test Duration. The test duration shall be as follows:

Fitting Size Duration, sec
NPS≤2 60
2 ½≤NPS≤8 120
NPS≥10 180

8.2.5 Acceptance. No visible leakage is permitted through the pressure boundary wall.