What is slip on flange?

The slip-on flange also called SO flange has a lower hub because the pipe slips into the flange before welding. It is welded inside and out to provide adequate strength and prevent leakage. The bores of slip on flanges are all slightly larger than the outside diameter of the mating pipe, and many users prefer slip-on flanges to welded neck flanges because of the lower initial cost, but because of the additional welding involved, the final installation cost may not be much less than that of a weld neck flange.

Slip-on flanges or SO flanges are usually less expensive than welded flanges and are therefore preferred by customers. However, customers should keep in mind that this initial cost savings may be minimized by the additional cost of the two fillet welds required for proper installation. In addition, weld neck flanges have a higher service life under pressure than slip on flanges.

Slip On flanges are positioned so that the distance between the insertion end of the pipe or fitting and the face of the flange is the thickness of the pipe wall plus 1/8 inch, which allows a fillet weld to be made inside the SO flange without any damage to the face of the flange. The back or outside of the slip-on flange or SO flange is also fillet welded.

Slip-on flanges are probably the most common type of flange in the industry and are perfect for low pressure applications. With slip-on flanges, you don’t have to specify the pipe size because the inside diameter is determined by the outside diameter of the pipe. The outside diameter of the pipe does not change from one specification to the next. This usually makes it easier for suppliers to stock them. Manufacturers also like these flanges because they are easier to align than weld neck flanges. They are also easier to cut pipe to the right length. They can be used in high-temperature and high-pressure applications, but are generally not recommended compared to other types of flanges.

Slip-on flanges or SO flanges are favored by some contractors for their lower initial cost compared to weld neck flanges. However, this may be offset by the additional cost of the two fillet welds required for proper installation. Slip-on flanges are strong enough for their rating, but their life under fatigue conditions is only one-third that of weld-neck flanges.

Slip-on flanges can be attached to the end of a fitting or to one or more ends of a pipe coupling. Slip-on flanges are positioned so that the inserted end of the pipe or fitting is rearward or shorter than the flange face by a thickness of the pipe wall thickness plus 1/8 inch. This allows a fillet weld equal to the pipe wall thickness to be made inside the SO flange without any damage to the flange face. The back or outside of the flange is also fillet welded.

There is another variation of the slip-on flange. This is the slip-on reducer flange. This is simply a larger (e.g., 14-inch) Slip On flange blank with a center (pipe) hole cut (or drilled) not for a 14-inch pipe, but for a 6-inch (or other size) pipe.SO Reducing flanges are primarily used to reduce the size of a pipeline because of space constraints that preclude the use of a weld-necked flange in conjunction with a Reducing Fitting. Slip-on reducer flanges can only be used when flowing from a smaller size pipe to a larger size pipe.

The slip-on flange is drilled so that it does slip on the pipe, so that the end of the pipe sits just inside the flange, a fraction of an inch from the face of the flange. The end of the pipe has been cut square. The flange bolt holes are aligned so that the flange face is square to the pipe. A fillet weld is then made around the end of the pipe to fuse it to the flange bore. Another fillet weld is made at the back end of the flange hub to fuse it to the outside of the pipe. This is the most common welded flange. Before the final full-scale fillet weld is made, a temporary tack weld is made until it is aligned. These welds are easy to remove so they can be corrected.

Socketed slip-on flanges are welded externally only. The square pipe end rests against the lip in the flange bore.

Slip-on flanges are slightly larger than the outside diameter of the pipe being used. The pipe slips into the flange before being welded inside and out. High quality slip-on flanges are ideal for low pressure applications. Easy to install and weld, slip-on flanges also reduce manufacturing costs.

Cangzhou Taichang Pipeline Equipment CO,. LTD is a professional manufacturer of flanges and pipe fittings, we looking forward to cooperate with you!

Carbon Steel And Stainless Steel Slip On Flange

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