What is the difference between slip on and weld neck flange?
The Weld Neck Flange offers increased strength under higher pressures, subzero or elevated temperatures that cause line expansion or retraction or other variable forces. The Slip On Flange is designed to be welded to pipe then a fitting as fittings are designed for butt weld connections.
When would you need to 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.
Why a lap flange and stub end would be used instead of a weld neck flange?
A pipe is usually welded to the Stub End and the Lap Joint pipe flange is free to rotate around the stub end. The benefit of this is that there will not be any issues with bolt hole alignment. Lap Joint pipe flanges are often used for applications that require frequent dismantling.
What is a weld neck flange used for?
Weld neck flanges are the most popular flange type with a neck extension with a weld bevel at the end. This type of flange is designed to butt weld directly to pipe to provide a superior and relatively natural form connection.
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.
Are lap joint flange 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 WN flange?
A weld neck flange (WN flange) means a flange has a neck for welding with the pipe, it is easily to recognized by their long tapered neck on the flange (The neck is also called hub in the weld neck flange).
What are the dimensions of a reducing flange?
ANSI reducing flange dimensions ranges from 1/8″ NB to 48″NB. They are available in different specifications including 2500 #, 1500#, 900#, 600#, 300# and many others.
What is lap joint flange?
A lap joint flange, abbreviated as LJF, is a flange that consists of two parts, a stub end and the backing flange. On drawings, it can be abbreviated as LJF. On a Lap Joint, the flange slides over the pipe and the stub end is the connection where the gasket sits.
What is a slip flange?
Slip On Flange. Slip on flange is a type of steel flange which slides over the end of steel piping and then welded in place.Because the pipe slips into the flange before welding,it has a low hub.The inside and outside of the flange are both welded,resulting in sufficient strengh and no leak.