What is flange and types?

What is flange and types?

The key types of flanges are the welding neck, long welding neck, slip-on, socket weld, lap joint, threaded and blind flanges. In addition to these standard flanges, some special ones exist, called Weldoflange/Nipoflange and Elboflange, swivel flange, expander/reducer flange, and orifice flanges.

What is slipon flange?

Slip on Flange is essentially a ring that is placed over the pipe end, with the flange face extending from the end of the pipe by enough distance to apply a weld bead on the inside diameter. The OD of slip on flange is also welded on the back side of the flange.

How many types of flange classes are there?

The ASME pressure classes for flat-face flanges are Class 125 and Class 250. The classes for ring-joint, tongue and groove, and raised-face flanges are Class 150, Class 300, Class 400 (unusual), Class 600, Class 900, Class 1500, and Class 2500.

What are the two main types of flanges available?

We usually consider two main families of flanges, the standard flanges and the special ones.

What is RF in flange?

The raised face (RF) is the most common type of flange facing used. It is called a raised face flange because it has a raised surface above the bolting circle where the gasket is placed. These flanges are widely used in oil and gas pipelines. They are appropriate for both high and low temperatures and pressures.

What is flange standard?

A flange standard lays down the dimensions, surface finish, facing type, marking, material and technical specifications for flanges. National flange standards in Europe have largely been superseded by the European EN 1092 series.

What is a hubbed flange?

Slip-on flanges, also known as ‘hubbed flanges’, have a hub with a very low profile. This type of flange is usually connected to a pipe by one or two fillet welds (one outside the flange and one inside the flange), it is however possible to use only a single weld.

What is ASME Class 150 pressure rating?

ASME PRESSURE RATING

For example a Class 150 A105 flange is rated to approximately 270 PSIG (1861 KPA) at ambient temperature, 180 PSIG (1241 KPA) at approximately 400ºF (204ºC) 150 PSIG (1034 KPA) at approximately 600ºF (315ºC), and 75 PSIG (517 KPA) at approximately 800ºF (426ºC).

What is flange class rating?

The term “flange rating” (or class) refers to the maximum pressure (in psi or bars) that a flange withstands at increasing temperatures. Flanges with a higher rating (class) are stronger than flanges with lower ratings, as they bear more pressure at increasing temperatures.

How do you identify a flange?

You need to find the outer diameter, the inner diameter, the number of bolt holes, bolt hole diameter, and the bolt circle diameter. Bolt circle diameter (B.C.) is one of the most important measurements to make when identifying a flange.

What is RF and FF in flange?

Bolted pipe flanges come in several styles. The two most common styles are flat faced [FF] and raised face [RF]. Pictured at the left is an RF weld neck flange. It is easily identifiable by the raised annular ring around the perimeter of the flow area. A FF flange looks similar but without the raised portion.

What is RF and RTJ?

Answer: RF means “Raised Face.” SPWD means “Spiral Wound.” (Referring to a gasket for RF flanges) RTJ means “Ring Type Joint.”

What is meant by PN16?

Nominal pressure 16 bar; maximum internal allowable pressure (in bar) of a mechanical component, considering a temperature of 20 °C.

What class is PN16?

Flange Tables

How do you specify a flange?

Users need to address the following parameters to specify the right flange for the application: pad size; bolt hole size or tapped hole size and thread; flange type; connection type and size; geometry; material; pressure; and extras.

What does class 250 flange mean?

These higher ratings are in place because ASME/ANSI fittings are expected to deal with more hazardous service situations such as steam! The Class 250 flange is an ANSI /ASME specification, not an AWWA, and it means the joint can withstand 250 psi at 373 degrees Fahrenheit.

What is a class 300 flange?

A Class 300 flange can handle more pressure than a Class 150 flange, because a Class 300 flange are constructed with more metal and can withstand more pressure. However, there are a number of factors that can impact the pressure capability of a flange.

What do DN and PN mean on flanges?

Nominal diameter (DN) and nominal pressure (PN)

How do you read a flange size?

Use a ruler or measuring tape to find the diameter of your nipple (the horizontal width across it) in millimeters (1 cm = 10mm). Measure the nipple alone, do not include the areola, which is the outer edge around your nipple. Add 4 mm to this measurement, so if your nipple is 20 mm across, your flange size is 24 mm.

Can we connect RF with FF flange?

The bolts must be gradually and uniformly tightened in a cross pattern, and the torque required for the chosen gasket must not be exceeded. In addition, RF monitor flanges cracked on installation are not warrantable. Elkhart Brass does not recommend connecting FF flanges to RF flanges. Some codes such as ASME B31.

What is RTJ in valve?

A ring joint flanges (RTJ) is used when a metal-to-metal seal between the mating flanges is required (which is a condition for high-pressure and high-temperature applications, i.e. above 700/800 C°). A ring joint flange features a circular groove to accommodate a ring joint gasket (oval, or rectangular).

Where is RTJ flange used?

The RTJ flange (Ring Type Joint) is designed for high-pressure and/or high-temperature pipeline applications. This makes them the required standard in API specification flanges. Applications include oil field valves, pipework assemblies, and high integrity pressure vessel joints.

What is DN and PN?

What is PN 40?

PN is an acronym for “Pressure Nominale”. The PN is used as a prefix to the pressure rating of the Flanges. For example, the flange PN16 is designed to operate at up to 16 levels. Normal scores: PN6, PN10, PN16, PN25, PN40, PN64, PN100.

How do I know what class my flange is?

How to Select Required Flange Rating Class as per ASME B16.5 – YouTube