Slip-on flanges must be slid into the pipe before welding. In this case it is a double weld, both inside and outside, thus providing the durability they need to avoid leaks.
Slip-on flanges are suitable for low-pressure applications and are easy to install and weld onto different pipes. In addition, welding helps to reduce manufacturing costs. Slip-on flanges do not require a large longitudinal space in the line to be mounted. In addition, they do not require an exact cut in the pipe, and are less difficult to align. They are mainly used for fluids at low pressure or with little risk of leakage.
It is very common to find these flanges today in cooling water lines, firefighting water lines , low-pressure compressed air lines , and process lines for substances such as steam, oil, gas, condensates, etc. But always keeping in mind that the material to be distributed is at low pressure and the working conditions are not demanding.
They connect to the pipe through a fillet weld at the flange top and bottom. Slip On flange SO flanges are typically cheaper than Weld-Beck Flanges, which is why many customers tend to choose them.
It is one of the common used flange for the low pressure, medium temperature pipeline systems. Its mechanical characteristics are between the integral flange and the looping flange. The structure is simple, and the processing is convenient. So slip on flange welding is widely used in various fluid pipelines. There is a small portion extruded from the bottom face of the slip on flange, this type is raised face slip on flange.
The function of this area is to place a gasket seat during installation to get a better sealing performance. A small grooved is machined on the raised face part, this form is called RTJ type, the function of this groove is to place the gasket ring, also applied for sealing, compared to RF type, RTJ is designed for high pressure use.
Slip on flange use slip welding to connect equipment, so either below of name is describing the same flange:. ASTM A for carbon steel slip on pipe flanges. ASTM A for alloy and stainless slip on flanges. BS DIN The back face of the hub has a rounded transition or inside fillet that joins the hub to the sleeve.
The other piece of a Lap Joint Flange is the backing flange. This flange has all the same common dimensions O. One side, the backside, has a slight shoulder that is square cut at the center or pipe hole. The front side has flat face and at the center hole an outside fillet to match the fillet of the "Stub-end" piece. The flange part of the Lap-joint flange assembly is slipped on to the stub-end prior to the sleeve being welded to the adjoining pipe or fitting.
The flange itself is not welded or fixed in any way. It is free to spin for proper alignment with what ever it is joining to. The "Stub-end" can normally be purchased in two lengths.
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