Dimensions Orifice Weld Neck RF flanges ASME B16.36 Class 300

Dimensions Orifice Weld Neck RF Flanges ​Information

The flange size refers to the nominal pipe size (NPS) of the flange. Orifice weld neck RF flanges are available in a range of sizes, starting from 1/2" NPS and going up to larger sizes as per the specific requirements of the application.

The flange thickness varies based on the pressure rating and the flange size. The thickness is typically specified in accordance with the pressure-temperature ratings provided by the applicable standard.

• Dimensions are in millimeters, except for bolts and bolt holes.
• Height of Raised Face (RF) in CLASS 300 is 2 mm.
• All other dimensions are in accordance with ASME B16.5.
• Ring joint flanges larger than NPS 3 will require angular meter taps.

• Other NPT sizes may be furnished if required.
• Bolt lengths for raised face flanges include allowance for orifice and gasket thickness
  of 6 mm (0.25 in.) for NPS 1 to NPS 12. Bolt lengths for ring-type joint flanges include
  allowance of 15 mm (0.62 in.) for NPS 1 to NPS 3.
• Bore (B) is to be specified by the purchaser.
• The length of the Stud Bolt does not include the height of the chamfers (points).

Tolerances
Tolerances on all dimensions shall be as shown in ASME B16.5 except for those shown below.

Pressure Tap Location
Tolerance on location of center of pressure tap hole from flange face shall be..

• ±0.5 mm (±0.02 in.) for flanges smaller than NPS 4
• ±0.8 mm (±0.03 in.) for flanges NPS 4 and larger

Bore Diameter

• Bore diameter tolerance (Welding Neck flanges only) is ±0.5% of nominal value.