Lap Joint Pipe Flanges are available in variety of material grades, sizes, and specifications to meet our clients’ requirements. Featuring a two-piece design, lap joint flanges require butt welding of the stub end to the pipe or fitting with the use of a backing flange to create the flanged connection. This design makes this style popular for use in systems with limited physical space or systems which require frequent dismantling and maintenance. There are several materials available for lap joint flanges, including Carbon Steel, Alloy Steel, Stainless Steel, Hastelloy, Inconel, Monel and duplex Steel. Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face. These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End. Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges.
The lap joint is a type of flanged joint as well as a type of facing. If lap joint flanges are considered for an application, then the type and nature of the seal must also be considered. The lap joint uses a separate flange to carry the bolting and apply the axial load. Lap joint connections can be considered when the piping material is exotic, expensive or non-metallic. The lap joint flange is economical if costly pipe such as stainless steel is used because the flange can be carbon steel, and only the lap joint stub end needs to be furnished in the line material. Lap joint flanges are used extensively in a wide variety of industries, including chemical, oil & gas, Paper & Pulp, heating power generation, food processing, structural pipe, and process industries.
CARBON STEEL SPECIFICATION:
- Size : 1/2″ NB to 80″ NB
- Dimensions: ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Class : 150# , 300#, 400#, 600#, 900#, 1500#, 2500#
- Schedule : 10/20/40/80/100/120/160/XXS
- Carbon Steel : ASTM A 105
- Carbon Steel : DIN Standard – EN 10222-2/ EN 10222-4 – P235GH / P245GH / P265GH / P280GH / P295GH / P355N / P355NH / P285NH / P285QH
- Other Services: Hot Dip Galvanizing, Sand Blasting, Special Threading.
ALLOY STEEL & LTCS SPECIFICATION:
- Size : 1/2″ NB to 80″ NB
- Dimensions: ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Class : 150# , 300#, 400#, 600#, 900#, 1500#, 2500#
- Schedule : 10/20/40/80/100/120/160/XXS
- Alloy Steel : ASTM A 182-F5, F9, F11, F21, F22 & F91
- Low Temp.CS : A 350 LF2
- Other Services : Hot Dip Galvanizing, Sand Blasting, Special Threading.
STAINLESS STEEL & DUPLEX STEEL SPECIFICATION:
- Size : 1/2″ NB to 64″ NB
- Dimensions: ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Class : 150# , 300#, 400#, 600#, 900#, 1500#, 2500#
- Schedule : 10/20/40/80/100/120/160/XXS
- Stainless Steel : ASTM A 182 F -304/304H/304L/316/316H/316L/316Ti/309/310/317L/321/347/904L,XM19
- Stainless Steel : DIN Standard EN 10222-5 1.4301/1.4307/1.4401/1.4404/1.4529/1.4571/1.4541/1.4410/1.4550/1.4335/1.4539
- Duplex Steel : ASTM A 182 F -51, F 53, F 55
NICKEL ALLOYS SPECIFICATION:
- Size : 1/2″ NB to 48″ NB
- Dimensions: ANSI/ASME B 16.5, B16.47, B16.36, DIN Standard, JIS Standard, EN1902-1 Standard, UNI Standard, BS10 Standard, BS4504 Standard, API Standard etc.
- Class : 150# , 300#, 400#, 600#, 900#, 1500#, 2500#
- Schedule : 10/20/40/80/100/120/160/XXS
- Copper Nickel : C70600(90:10), C71500(70:30), C71640
- Nickel : UNS N02200, N02201
- Monel : UNS N04400, N05500, Alloy 20
- Inconel : UNS N06600, N06601, N06625, N08800, N08810, N08825,
- Hastelloy : UNS N10276, N06022, N10665, N06455,
- SMO 254 Grade UNS S31254
- Aluminium : ASTM B247, B361 – 2024, 6061, 6063, 6101, 7075.
- Titanium : ASTM B381 – Grade 1, Grade 2, Grade 4, Grade 5, Grade 6, Grade 7, Grade 9, Grade 19, Grade 23