Lap Flanges are used with a stub end, which is welded to the pipe. Alloy Steel Lapped Flanges are designed in a way that they swing over the pipe without the need to be welded. As they do not come in contact with the inner fluid, they do not corrode and can be re-used. Our ANSI B16.5 Stainless Steel Flanges are inexpensive and widely useful. In addition, they can be easily assembled and dismantled for a quick inspection.
| Material Category | Available Grades |
|---|---|
| Stainless Steel Flanges | ASTM A182 / A240 F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F347, F347H, F904L. |
| Duplex & Super Duplex Steel Flanges | ASTM/ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61. |
| Carbon Steel Flanges | ASTM/ASME A/SA 105, ASTM/ASME A350, ASTM A181 LF2, ASTM A516 Gr.70, ASTM A36, ASTM A694 F42, F46, F52, F60, F65, F70. |
| Low Temperature Carbon Steel Flanges | ASTM A350 LF2, LF3. |
| Alloy Steel Flanges | ASTM/ASME A/SA 182 & A387 F1, F5, F9, F11, F12, F22, F91. |
| Copper Alloy Flanges | ASTM SB61, SB62, SB151, SB152, UNS C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30), C10100, C10200, C10300, C10800, C12000, C12200. |
| Nickel Alloy Flanges | ASTM SB564, SB160, SB472, SB162, Nickel 200 (UNS N02200), Nickel 201 (UNS N02201), Monel 400 (UNS N04400), Monel K500 (UNS N05500), Inconel 800 (UNS N08800), Inconel 825 (UNS N08825), Inconel 600 (UNS N06600), Inconel 625 (UNS N06625), Inconel 601 (UNS N06601), Hastelloy C276 (UNS N10276), Alloy 20 (UNS N08020). |
Our Lap Joint Flanges are used for systems requiring frequent dismantling, inspection, and easy bolt-hole alignment. We supply project and replacement requirements with controlled quality, dimensional checks, and material traceability as per ASME B16.5.
Industries Served: oil & gas, petrochemical, power, EPC, shipbuilding, water treatment, process manufacturing, and heavy engineering.
Supply Regions: India, GCC/Gulf countries, and global export destinations with commercial support for manufacturer, supplier, stockist, and exporter requirements.
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Certified stainless steel billets are selected according to ASTM, ASME, and EN standards.
Billets are heated and forged into the required flange shape for maximum strength.
Precision machining creates the bore, facing, bolt holes, and required dimensions.
Stress relieving and solution annealing are performed whenever required.
PMI, dimensional inspection, hydrostatic testing, and NDT ensure product quality.
Flanges are cleaned, pickled, passivated, and finished as per customer requirements.
Each flange receives grade, size, heat number, and standard identification markings.
Products are packed securely with flange protectors, wooden pallets, and export-ready crates.
What are the primary applications for Lap Joint Flanges?
Lap Joint Flanges are primarily used in piping systems that require frequent dismantling for inspection and cleaning, as well as applications where easy bolt-hole alignment is essential. Used with Stub Ends, they allow the flange to rotate freely over the pipe, making the assembly of complex low-pressure piping systems much easier.
When should I use a Lap Joint Flange instead of a Weld Neck Flange?
Lap Joint Flanges slide loosely over the pipe and are used together with a Stub End. They are ideal for piping assemblies that require regular maintenance, inspection, or cleaning because the rotating flange makes bolt alignment quick and easy during installation and reassembly.
Are Lap Joint Flanges cost-effective for exotic alloy systems?
Yes. Since the Lap Joint Flange itself does not come into contact with the process fluid, an expensive Stainless Steel or Duplex Stub End can be paired with a lower-cost Carbon Steel backing flange, reducing overall material costs without compromising corrosion resistance.