What is RFSF?

What is RFSF?

The term RFSF was used to differentiate these smooth face flanges from those with the rougher standard finish. When an RFSF flange is specified, the required finish should also be defined, for example 63-125Ra or 125-250Ra. In recent editions of ASME B16. 5, the standard finish is defined as 125-250 Microinch average.

Where do you use a welding neck flange?

Weld neck flanges are used in applications where the conditions are severe and critical. Some of these conditions include high pressure, wide fluctuations in temperature and pressure, high temperature, fluids that are volatile and hazardous, and temperatures in the sub-zero range.

How does a weld neck flange work?

These pipe flanges attach by welding the pipe to the neck of the flange. This transfers stress from the flange to the pipe instead. It also reduces the stress concentration from the base of the hub. Weld neck flanges are often used for applications where high pressure is a factor.

What is RFSF flange?

The Raised Face flange is the most common type used in process plant applications, and is easily to identify. It is referred to as a raised face because the gasket surfaces are raised above the bolting circle face.

How do you specify a flange?

FLANGE SIZES The key sizes for a pipe flange are: the nominal size (i.e. the bore size of the flange, to match the bore size of the connecting pipe) the flange rating (which designates the pressure/temperature performance of the flange, i.e. 150#, 300#, 400#, up to 2500#)

Are lap joint flanges raised face?

The lap joint flange can be used in sizes and pressure classes similar to that of a weld-neck flange. The nature of this joint means that the stub end facing is also the flange facing, which makes it raised faced, and the gasket seating surface.

What is a weld neck flange RF ( raised face )?

Zizi is manufacturer of ASME B16.5 forged steel pipe fittings and offers Weld Neck Flange RF in different dimensions. What is a Weld Neck Flange? It is very easy to identify a weld neck flange from the appearance because it has a high, tapered hub like a neck. This neck will be welded with pipe so it has the same wall thickness as pipes.

Why are weld neck flanges used with pipes?

This neck will be welded with pipe so it has the same wall thickness as pipes. It also has the effect of dispersing pressure, making the pipe less deformable. There are two designs for weld neck flange RF: a regular types we often used with pipes, the other is long hub type which is suitable for process plant.

What do you mean by ” rfsf ” when you specify flanges?

What do you mean by “RFSF” when you specify flanges? Maybe I think it’s raised face smooth finish. Am i right? Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

What is the diameter of a NPS weldneck flange?

· 2” NPS weldneck Flange has inside diameter of 2.07” and outside diameter of 6.00”, The raised face’s thickness is of 2.50”. · The 5” NPS Flange has 5.05” of inside diameter and the outer diameter is of 10.00”. The thickness of the raised face is 3.50”.