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Loose Flange Lap Joint Flange

Lap joint flange / loose flange is a flange that is loosely looped on the pipe and used in combination with a flanging joint or a welding ring. The loose flanges we supply are produced by high quality carbon steel or stainless steel. Customized flanges used for all kinds of usages.
  • Customized
  • FOTMA
  • Material Grade: F304/304L, F316/316L
  • Type: Lap Joint Flanges
  • Standard: ANSI, JIS, BS, ISO
  • Surface Treatment: Galvanizing Coating or Painted
  • Application: Water works, Shipbuilding, Petrochemical Industry
  • Process: Forging and machining
Quantity:
Lap Joint Flanges / Loose Flanges

1, Used where bolt alignment or access for cleaning is required
2, Similar to slip-on flange when used with lap joint stub end
3, Radius at intersection of flange face and bore to match lap joint stub end

Flange Standard
American Standard ASME B16.5,ASME B16.47,ANSI B16.5,API605,AWWA C207
Japanese Standard JIS / KS 5K / 10K / 16K / 20K / 30K
German Standard DIN2527,2528,2561,2565,2566,2573,2576,2627-2638,2641,2642,2655,2656,2673,86029
British Standard BS4504 PN16 / 25 / 40,BS10 TABLE E / TABLE D
Italian Standard UNI 2253,2254,2276,2278,2281,6084-6093
China Standard GB/T 13402-92,GB/T9112-9124-2000,HG5010-5028


Types' Specification

Welding neck
1, Preferred for high-pressure, subzero or elevated temperature
2, Hub is tapered and bored to match pipe's inside diameter so flow is not restricted, preventing turbulence and reducing erosion
3, Easily radiographed and provides excellent stress distribution
Slip-on
1, Not normally used in high-stress applications due to low hub and weld attachment
2, Silps over outside of pipe
3, Inside of flange welded at hub and end of pipe
Lap joint
1, Used where bolt alignment or access for cleaning is required
2, Similar to slip-on flange when used with lap joint stub end
3, Radius at intersection of flange face and bore to match lap joint stub end
Threaded
1, Used where welding would would be hazardous
2, Designed for low-pressure and non-cyclic applications
3, Bore is threaded to match pipe thread
4, Tapered to seal pipe and flanges
Socket welding
1, For small-diameter chemical processes, hydraulic and stream distribution lines
2, Similar to slip-on flange
3, Counter bore matches pipe bore, allowing unrestricted flow
4, Counter bore from hub side fits pipe's outer diameter -  can insert pipe in socket with fillet weld at hub
Blind
1, Used to close ends of piping
2, Has no bore
3, Permits access to sealed lines
Other flanges
Orifice, Expander, Reducing, Lightweight, Studding Outlets, Long Weld Necks, Metric, Navy Drawings, Customer Drawings
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