What are flange dimensions?

Diameters and bolt circles for standard ASME B16. 5 flanges – 1/4 to 24 inches – Class 150 to 2500

Nominal Pipe Size NPS (inches) Class 150
Diameter of Flange (inches) Diameter of Bolt Holes (inches)
1/4 3-3/8 0.62
1/2 3-1/2 0.62
3/4 3-7/8 0.62

What is long weld neck flange?

Long Weld Neck Flanges are like weld neck flanges, except for the neck, which is extended and acts like a boring extension. Long weld neck flanges can be used in high pressure industrial applications, as well as high temperature situations. They are often utilized in the oil and gas or petrochemical industries.

How much does a 20 weld neck flange weight?

ANSI B16. 5 – ½” – 24” Forged Flanges Weight Chart

Nominal Pipe Size Slip On Weld Neck
16 106 140
18 130 165
20 165 197
22 185 225

What is the difference between ASME B16 5 and ANSI B16 5?

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. 5″ or “B16 5” is used interchangeability and refers to same standard. However, the standard ASME B16 5 (ANSI B16 5) only covers size up to 24 inches.

What is a nozzle flange?

Also known as nozzle flanges or “long neck” flanges, these items were designed specifically with the pressure vessel and tank fabrication industry in mind. They are usually made as a one-piece construction with the intention of replacing a standard weld neck and pipe weld combination.

How do you measure flange thickness?

The blind flange is attached by bolts causing an edge moment (Fig. UG- 34. /sketch j) in which the thickness can be calculated by : t = d *(CP/SE+1.9W hg/SE*d^3) ½ ………………. Formula (2) (From ASME UG-34)

Is ASME and ANSI the same?

ANSI establishes and accredits performance and quality standards for products and services in a wide variety of sectors, while ASME is primarily focused on boilers and pressure vessels.

What is difference between ASTM and ASME?

ASTM represents quality for materials to be used in products which are described in ASME. ASTM International is one of the largest voluntary standards developing organizations in the world. ASME standards represents the dimensions and tolerances with respect to each material class.

What is a 150 lb flange?

As temperature increases, the pressure rating of the flange decreases. For example, a Class 150 flange is rated to approximately 270 PSIG at ambient conditions, 180 PSIG at approximately 400°F, 150 PSIG at approximately 600°F, and 75 PSIG at approximately 800°F. Each material have different pressure ratings.

What is the diameter of a flange?

Many flanges are simply 3 inches in diameter, which means the top and bottom are each 3 inches wide. These flanges must install on a 3-inch-diameter schedule 40 drain pipe or directly to a 3-inch closet bend.

What is a welded neck flange?

A welding neck flange (“WN”)features a long tapered hub that can be welded with a pipe. This flange type is used, normally, in high-pressure and high/low temperatures applications that require an unrestricted flow of the fluid conveyed by the piping system (the bore of the flange matches with the bore of the pipe).

Can a weld neck flange be bolted to?

The weld neck flange comprises of a round fitting that extends beyond the rim of the circumference. These flanges, typically manufactured from forging, are actually welded to pipes . The rim has numerous holes drilled into it that enables the flanged to be attached to a bolted flange . This design is far better because of the structural valve.

What is flange welding?

A weld flange is a device used to attach two pieces of pipe in a bolt-together fashion.