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Description

Slip on Flange

Slip-On flanges or SO flanges are commonly lower in price than weld-neck flanges, and to this effect are a popular choice for our customers.



It is welded both inside and out to provide suffcient strength and prevent leakage.

Slip-On Flanges. As made obvious by their name, these pipe flanges slip over the pipe. Theyre manufactured with an inside diameter that is slightly bigger than the pipes outside diameter. These attachments are connected to the pipe via fillet weld at the top and bottom of the flange.

However, customers should bear in mind that this initial cost saving may be diminished by the additional cost of the two fillet welds required for proper installation. Moreover, weld-neck flanges have a higher life expentancy than slip-on flanges under duress.

Slip-on flanges are all bored slightly larger than the O.D. of the pipe. They are preferred over welding neck flanges bu many users due to their lower intial cost, but final intallation cost is probably not much less than that of the welding neck flange because of the additional welding involved.


Weldneck and Slip-On Orifice Runs

Advantages of slip on flanges:
  • Low cost installation
  • Less time needed to spent on ensuring the accuracy of the cut pipe
  • They are somewhat easier to align
  • The slip-on flanges have low hub because the pipe slips into the flange before welding
  • The flange is welded both inside and outside to provide sufficient strength
  • They prevent leakage

A combination of flange and elbow or flange and tee is not possible, because named fittings have not a straight end, that complete slid in the Slip On flange.



Standards, Dimensions & Weight of Slip on flanges

The Slip-on flange has a low hub because the pipe slips into the flange prior to welding.

1. Slip On flange 2. Filled weld outside 3. Filled weld inside 4. Pipe
Material of Slip-on flange:

Slip on pipe flanges in stock include AWWA slip on pipe flanges, ANSI slip on pipe flanges, Pressure Vessel slip on pipe flanges and slip on pipe flanges that match the OD and drilling of ASME flanges.

  • Cabon steel: A105, A350 LF2
  • Stainless steel: A182 F304/F304L/F316/F316L/F321
  • Alloy steel: F11, F12

Product Name: Slip on Flange


Material Alloy steel (ASTM A234 WP12/WP11/WP22/WP5/WP9/WP91)
Stainless steel (ASTM A403 WP304/WP304L/WP316/WP316L)
Carbon steel (ASTM A234WPS, A234WPC, A420 WPL6), St45.8 A105 A106 STG42)
Standard ASME B16.5 MSS SP44 Gost JIS etc
Type WN FLANGE, SO FALNGE, LAP JOINT FALNGE, THREADED FLANGE, SOCKET FLANGE , BLIND FLANGE
Pressure class 150 class 300 class 600 class 900 class 1500 PN6 PN16 PN25 PN40 PN100......
Size 1/2-80 inch (DN15-DN2000)
Surface treatment Anti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,
Hot dipped Galvanized.
Inspection Factory in-house self check or Third Party inspection
Packing Wooden case, pallet or as customers’ requirement
Applications Petroleum,chemical,power,gas,metallurgy, shipbuilding, construction, etc
Heat Treatment Normalizing, Annealing, Quenching+Tempering
Payment L/C T/T


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