Square Flanges

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Description:
Square flanges are made in accordance with JIS B2291 / JIS F7806 standards. Square flanges are used for between pipe-to-pipe or pipe-to-components connections. They are mostly used in hydraulic systems line where there is a passage of fluids and are made of two materials which is steel and stainless steel.

There are 3 type of designs for square flanges: SHAB Square Flanges, SSAB Square Flanges, and KAB Square Flanges. The pressure ratings for square flanges are available in 210 kg/cm², 280 kg/cm², and 350 kg/cm². It is with a single available socket weld connection that requires the pipe to have plain connection ends.

Features:

Size Range: 1/4" to 6"
Design Standard: JIS B2291 / JIS F7806
Configuration: SHAB (SHA+SHB), SSAB (SSA+SSB), KAB (KA+KB)
Material: Steel (SF440A) / SS316
Working Pressure: 210 kg/cm², 280 kg/cm², 350 kg/cm²
Brand: RFS
Origin: Korea / China

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What are Square Flanges

Square Flange Assembly Procedure

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Square Flanges Product Information

SHAB and SSAB Square Flanges

Specifications:
Square flange is a square shape flange that used in between pipe to pipe or pipe to components connections, like valves, tees, and elbows. Square flanges are made in accordance to JIS B2291 / JIS F7806 standard. It links the JIS standard nominal bore size pipes together in a hydraulic system. Square flanges are mostly used in hydraulic oil systems or steam lines.

Material:
The materials used to fabricate square flanges are steel (SF440A) and stainless steel (SS316).

Size Range & Pressure Rating:
The sizes of square flanges range from 1/4" to 6" in nominal bore sizes. Pressure rating of square flanges are available in 210 kg/cm², 280 kg/cm², and 350 kg/cm².

Oring and Flat Square Blind Flanges

Connections Type & Configurations:
The only available connection for square flanges is socket weld where the connection sides of pipes need to be plain ended. There are various types of configurations for square flange: SHAB, SSAB, KAB, LSA, and Blind Flange.

SHAB series is a complete set of 210 kg/cm² square flange that combined by hexagon hex bolts with nuts, while SSAB series is a complete set of 210 kg/cm² square flange combined by a socket cap screw. For KAB series, it is a complete set of 280 kg/cm² or 350 kg/cm² square flange combined by hexagon hex bolts with nuts.

The flange body of SHAB are larger than SSAB. Complete set of square flange includes male flange (flat side), female flange (o ring side), o ring, and bolts. The female flange is identified as A and male flange is identified as B. Thus, the complete set is AB.

LSA is a special type o ring side square flange where the internal flow is in L shaped. Blind flanges are used to seal the flow at the end of a piping system. They are typically used to run a pressure testing of fluids through vessel or pipes. For the termination of hydraulic system, only one side of blind flange is used, either o ring side or flat side.

How to assemble Square Flanges

Square Flanges are used for high pressure hydraulic applications up to 350kgf/cm². In order to use and assemble square flanges safely, it is important to know the right procedures and torque range for assembly.

Square Flanges made in accordance to JIS B2291 / JIS F7806 standard are connecting pieces that links Japanese Industrial Standards nominal bore size pipes together and has a working pressure of up to 350kgf/cm². The pipes used should be of hydraulic seamless design and suitable for high pressure applications.

It is important to note that every hydraulic system requires some form of fitting installation. Hence, proper fabrication and installation are essential for leak free performance, the overall efficiency , and general appearance of any system. In order to use and assemble Square Flanges safely, it is essential to know the right procedures. Do watch our youtube video and our instructions below carefully!

Assembly of Square Flanges:
Below are the instructions for assembly of Square Flanges.

STEP 1

Ensure the sealed surface are free from scratches and contamination.
Lubricate with system fluid or any compatible lubricant on the surface of O-ring portion.

STEP 2

Position the flange.
Place the bolt on the bolt hole and bolt through it.

STEP 3

Tighten the bolts with nuts by hand.
Torque the bolts gradually in diagonal sequence.

STEP 4

Tighten the bolts with nuts by wrench.

Impa Code for Square Flanges

Square Flanges can be found in the IMPA Marine Stores Guide, which is the world’s leading reference guide for maritime purchasing and supply.
For details on the reference codes of square flanges, please kindly see below:

SHA SQUARE FLANGES:
IMPA CODE: 734801   15A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734802   20A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734803   25A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734804   32A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734805   40A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734806   50A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734807   65A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734808   80A SHA SQUARE FLANGE ORING SIDE ONLY

SHB SQUARE FLANGES:
IMPA CODE: 734811   15A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734812   20A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734813   25A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734814   32A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734815   40A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734816   50A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734817   65A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734818   80A SHB SQUARE FLANGE FLAT SIDE ONLY

SSA SQUARE FLANGES:
IMPA CODE: 734821   15A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734822   20A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734823   25A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734824   32A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734825   40A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734826   50A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734827   65A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734828   80A SSA SQUARE FLANGE ORING SIDE ONLY

SSB SQUARE FLANGES:
IMPA CODE: 734831   15A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734832   20A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734833   25A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734834   32A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734835   40A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734836   50A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734837   65A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734838   80A SSB SQUARE FLANGE FLAT SIDE ONLY

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