What is a square flange?
What is a square flange?
The square flange is to fix two piping equipment, pipe fittings or equipment on a flange plate respectively, add flange gaskets between the two flange plates, and fasten them together with bolts to complete the connected product. An important connection method for pipeline construction is widely used in low, medium and high pressure pipelines and equipment in various industries.
Types of square flanges
There are four types of Square Flanges under this standard:
- SHAB – Used with hexagon hex bolts, larger flange body size (Figure 1)
- SSAB – Used with socket cap screw, smaller flange body size than SHAB (Figure2)
- LSA – Oring side only, L shaped internal flow (Figure 3)
- Square blind flange – Either the female blind flange (oring side), or male flange (flat side) will be connected to the component to close off the pipe line (Figure 5).
A complete set of square flanges consist of the female flange (oring side), male flange (flat side), oring, and bolts. The female flange is identified as part A. The male flange is identified as part B. And the complete set is AB.
Figure 4 – Left : SHAB Square Flange using Hexagon bolts (larger flange body), Right: SSAB Square Flange using Socket Cap Screw (smaller Flange body)
Blind Square Flanges:
Another type of flange available are square blind flanges. These are used to seal the end of a piping system or pressure vessel openings to prevent flow. Square blind flanges are commonly used for pressure testing the flow of liquid or gas through a pipe or vessel. They also allow easy access to the pipe in the event that work must be done inside the line. Only one side of a square blind flange is used for the termination of the piping system. Either the female blind flange (oring side), or male flange (flat side) will be connected to the component to close off the pipe line (Figure 5).
Figure 5: Oring and Flat Square Blind Flanges
Standard of square flange
JIS B2291 Square Flange
JIS F7806 Square Flanges
ISO 6164 Square Flange
Material, Size Range and Connection of Square Flange:
- 1/4″ to 6″
- Carbon Steel: SF440A
- Stainless Steel: SS316
- 210Bar / 21 Mpa / 210 kg/cm²
Source: China Square Flanges Manufacturer – Yaang Pipe Industry (www.steeljrv.com)
(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)
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