Lap joint flanges are similar to other type of flanges, but it does not have a raised face. Lap joint flanges are used in conjunction with a "Lap Joint Stub End". The total initial cost of a lap joint flange along with a stub end is around one third higher than that of comparable welding neck flanges. The pressure handling capacity of lap joint flange is cooperatively lower, and the fatigue life for the assembly is only one tenth that of welding neck flange. The lap joint flange with stub end assembly is used in piping systems which require regular dismantling for inspection and cleaning. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe stub end. Lap joint flanges are widely being used in shipbuilding, power generation, petrochemical plant, water treatment, dairy plant, pharmaceutical plant etc.
Standards: ASME B.16.5, ASME B.16.47 (A/B Series), B16.48-API590, API 605, AWWA C207, BS 10, DIN 2633, MSS-SP-44.
Classes: 150 lbs up to 2500 lbs
Sizes: 1/2"up to 36" (Sizes over 36" available on request)
Materials: Monel, Nickel, Inconel, Hastalloy, Titanium, Tantalum, Stainless Steel, Alloy Steel, Carbon Steel, Cupro-Nickel 90/10 & 70/30
Joint faces: RF/RTJ/FF

Lap joint flanges are similar to other type of flanges, but it does not have a raised face. Lap joint flanges are used in conjunction with a "Lap Joint Stub End". The total initial cost of a lap joint flange along with a stub end is around one third higher than that of comparable welding neck flanges. The pressure handling capacity of lap joint flange is cooperatively lower, and the fatigue life for the assembly is only one tenth that of welding neck flange. The lap joint flange with stub end assembly is used in piping systems which require regular dismantling for inspection and cleaning. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe stub end. Lap joint flanges are widely being used in shipbuilding, power generation, petrochemical plant, water treatment, dairy plant, pharmaceutical plant etc.
Standards: ASME B.16.5, ASME B.16.47 (A/B Series), B16.48-API590, API 605, AWWA C207, BS 10, DIN 2633, MSS-SP-44.
Classes: 150 lbs up to 2500 lbs
Sizes: 1/2"up to 36" (Sizes over 36" available on request)
Materials: Monel, Nickel, Inconel, Hastalloy, Titanium, Tantalum, Stainless Steel, Alloy Steel, Carbon Steel, Cupro-Nickel 90/10 & 70/30
Joint faces: RF/RTJ/FF