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Stainless Steel Fitting
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Size: 1/2" ~60" (DN10~DN1500);
Pressure: Class 150lbs ~2500lbs;PN16, PN25, PN40; 10K, 20K;
Flange Face: RF, FF, RTJ, Male Face, Female Face, Tongue Face T, Groove Face G,
Manufacturing Standard: ANSI B16.5, JIS B2220, EN1092-1,GB/T9119;
Material: ASTM A182 F304, F304L, F316,F316L, F310S, F321, F347;
Technology: Forging, CNC lathe processing;
Mark: Logo, Size, Pressure, Standard, Material, Heat No. (Can mark according to customer's requirement.);
Surface Treatment: Degreasing Cleaning, Pickling;
Packing:Bubble wrap or plastic cover -Wooden Case or Pallet;
Certificates: GB/T19001-2016, ISO9001:2015, CE;
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The High-Quality Stainless Steel 304/316 Lap Joint Flange is a reliable pipe connection solution designed for easy alignment and maintenance in high-temperature and corrosive environments. Constructed from 304 or 316 stainless steel, this flange features a loose-fitting design that slides over a stub end, allowing rotational adjustment for perfect bolt hole alignment without pipe rotation.
Unique Lap Joint Design:
Flange ring slides freely over the stub end (weld neck or socket weld), enabling 360° rotation to align bolt holes, critical for offshore and modular piping where precise alignment is challenging.
Reduces stress on connected equipment by absorbing minor misalignments, extending the life of pumps, valves, and instruments.
Superior Material Performance:
304 stainless steel (18Cr-8Ni) for general corrosion resistance; 316 stainless steel (16Cr-10Ni-2Mo) for chloride-rich environments, with a minimum tensile strength of 515 MPa.
Compliant with ASME B16.5 (150#-2500#) and BS EN 1092-1 standards, with optional raised face (RF) or flat face (FF) finishes for different gasket types.
Easy Installation & Maintenance:
Stub end welded to the pipe (butt-weld or socket-weld), while the flange ring is bolted separately, allowing flange replacement without cutting the pipe.
Reduces welding requirements by 50% compared to integral flanges, ideal for on-site repairs and retrofitting projects.
Sealing & Pressure Rating:
Compatible with spiral wound, PTFE, and metal gaskets, achieving leak-free seals up to 2,500 PSI (316 stainless steel, 150# rating).
Temperature range: -250°C to 800°C (with appropriate gaskets), suitable for cryogenic, steam, and high-temperature process lines.
Perfect for demanding pipe connection scenarios:
Oil & Gas Offshore: Connecting subsea pipelines and platform modules, with 316 lap joints resisting seawater corrosion and cyclic loading.
Power Plant Turbines: High-temperature steam connections, with 304 flanges withstands 550°C and 316 flanges up to 700°C with proper thermal insulation.
Chemical Reactors: Flanged connections for corrosive media, with 316 stainless steel meeting CEPDG and OSHA standards for hazardous chemical handling.
Marine Vessels: Engine room piping and cargo tank connections, with lap joints facilitating alignment in vibrating shipboard environments.
Q: What is the difference between lap joint and weld neck flanges?
A: Lap joints allow flange rotation for bolt alignment, while weld necks are integral to the pipe, offering higher pressure ratings but less flexibility.
Q: Can lap joint flanges be used with non-stainless steel pipes?
A: Yes, but use a dielectric gasket to prevent galvanic corrosion when connecting to carbon steel pipes.
Q: How to select the correct gasket for my application?
A: Consult our gasket compatibility chart based on media type, pressure, and temperature; common choices include PTFE (general use) and metal jacketed (high-pressure).
Q: What is the minimum pipe size for lap joint flanges?
A: Available from 1" to 48" NPS, with custom sizes and ratings available for special industrial projects.
The High-Quality Stainless Steel 304/316 Lap Joint Flange is a reliable pipe connection solution designed for easy alignment and maintenance in high-temperature and corrosive environments. Constructed from 304 or 316 stainless steel, this flange features a loose-fitting design that slides over a stub end, allowing rotational adjustment for perfect bolt hole alignment without pipe rotation.
Unique Lap Joint Design:
Flange ring slides freely over the stub end (weld neck or socket weld), enabling 360° rotation to align bolt holes, critical for offshore and modular piping where precise alignment is challenging.
Reduces stress on connected equipment by absorbing minor misalignments, extending the life of pumps, valves, and instruments.
Superior Material Performance:
304 stainless steel (18Cr-8Ni) for general corrosion resistance; 316 stainless steel (16Cr-10Ni-2Mo) for chloride-rich environments, with a minimum tensile strength of 515 MPa.
Compliant with ASME B16.5 (150#-2500#) and BS EN 1092-1 standards, with optional raised face (RF) or flat face (FF) finishes for different gasket types.
Easy Installation & Maintenance:
Stub end welded to the pipe (butt-weld or socket-weld), while the flange ring is bolted separately, allowing flange replacement without cutting the pipe.
Reduces welding requirements by 50% compared to integral flanges, ideal for on-site repairs and retrofitting projects.
Sealing & Pressure Rating:
Compatible with spiral wound, PTFE, and metal gaskets, achieving leak-free seals up to 2,500 PSI (316 stainless steel, 150# rating).
Temperature range: -250°C to 800°C (with appropriate gaskets), suitable for cryogenic, steam, and high-temperature process lines.
Perfect for demanding pipe connection scenarios:
Oil & Gas Offshore: Connecting subsea pipelines and platform modules, with 316 lap joints resisting seawater corrosion and cyclic loading.
Power Plant Turbines: High-temperature steam connections, with 304 flanges withstands 550°C and 316 flanges up to 700°C with proper thermal insulation.
Chemical Reactors: Flanged connections for corrosive media, with 316 stainless steel meeting CEPDG and OSHA standards for hazardous chemical handling.
Marine Vessels: Engine room piping and cargo tank connections, with lap joints facilitating alignment in vibrating shipboard environments.
Q: What is the difference between lap joint and weld neck flanges?
A: Lap joints allow flange rotation for bolt alignment, while weld necks are integral to the pipe, offering higher pressure ratings but less flexibility.
Q: Can lap joint flanges be used with non-stainless steel pipes?
A: Yes, but use a dielectric gasket to prevent galvanic corrosion when connecting to carbon steel pipes.
Q: How to select the correct gasket for my application?
A: Consult our gasket compatibility chart based on media type, pressure, and temperature; common choices include PTFE (general use) and metal jacketed (high-pressure).
Q: What is the minimum pipe size for lap joint flanges?
A: Available from 1" to 48" NPS, with custom sizes and ratings available for special industrial projects.
