What does ASME B16 21 mean?

What does ASME B16 21 mean?

ASME B16.21. Nonmetallic Flat Gaskets for Pipe Flanges. This Standard covers types, sizes, materials, dimensions, tolerances, and markings for nonmetallic flat gaskets. These gaskets are dimensionally suitable for use with flanges described in the referenced flange standards.

What is ANSI class 150 flange?

The American National Standards Institute (ANSI) Class 150 is a system of dimensional standards for weld neck, threaded, slip-on, lap joint, socket weld and blind flanges. Dimensions for facing, bolts and studs are also included in ANSI Class 150.

What does ASME B16 5 mean?

ASME B16. 5 standard covers Steel Pipe Flanges and Flanged Fittings from NPS 1/2 through NPS 24 Metric/Inch in pressure class 150 to class 2500. It covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings.

What does ASME B16 9 mean?

9 – 2001 – Factory-Made Wrought Steel Butt-welding Fittings. This Standard covers overall dimensions, tolerances, ratings, testing, and markings for wrought factory-made butt-welding fittings in sizes NPS 1/2 through 48 (DN 15 through 1200).

What is an NPT valve?

NPT: This is a threaded connection. In fact, the acronym, NPT, stands for National Pipe Thread Taper. This is a United States standard for all piping and valve threads. Unlike the threading found on a typical bolt, which is straight, tapered threads will actually pull the valve tighter to the pipe during installation.

What are requirements of dimensioning?

The elements of dimensioning include the projection line, dimension line, leader line, dimension line origin indication, its termination, notes, the dimension, etc. The various elements of dimensioning are shown in Fig.

What is different between ASTM and ASME?

Basically ASTM creates the material specifications and standard test methods to determine compliance. ASME selects those ASTM materials which will perform adequately in boiler or pressure vessel service and accepts them with stated limitations.

What is ASME B16 47 flange?

ASME B16. 47(Large Diameter Steel Flanges) is a standard for large diameter steel pipe flanges sized from NPS 26 through NPS 60. The latest version provides dimensions and ratings in both metric and inch units.

What are the threading requirements of a threaded Flange?

The threads of a threaded flange is required to be concentric with the axis of flange opening and variations in alignment with respect to the flange face shall not exceed 5mm/m as per the requirements of ASME B16.5 para 6.9.1.

What is threaded Flange manufacturer?

Threaded Flange manufacturer Metal Industries supplies screwed flange, th forged Flange, threaded Flanges in forged steel, Stainless Steel, carbon steel etc..

What are the advantages of threaded flanges?

Its chief merit is that it can be assembled without welding, explaining its use in low pressure services at ordinary atmospheric temperatures, and in highly explosive areas. Threaded Flanges can be used in very high pressure services and their major advantage is that they can be assembled without welding.

What is a Class 400 threaded pipe flange?

When threaded flanges are assembled with threaded-end pipe, the intent is for the end of the pipe be reasonably close to the mating surface of the flange. This is achievable in flanges up to class 400 rating.