Home

Lap Joint Flange(LJ)

Lap Joint Flange (LJ), also known as Loose Flange, is a flange composed of a flange ring and a Stub End (lap joint short section). The flange ring is loosely sleeved on the Stub End, which is welded to the pipe, and the flange ring is connected by bolting. It has the advantages of convenient disassembly, low cost, and no damage to the pipe during disassembly, and is suitable for large-diameter, low and medium pressure pipeline systems and scenarios that require frequent disassembly. As a flexible flange type, it is widely used in various industrial pipeline systems, perfectly meeting the needs of international trade and large-diameter project applications.Core AdvantagesConvenient Disassembly: The flange ring is loosely sleeved on the Stub End, which can be quickly disassembled without damaging the pipe and Stub End, facilitating maintenance and replacement.Cost-Effective: The flange ring has a simple structure and low manufacturing cost, especially suitable for large-diameter pipeline systems, reducing overall project costs.Good Adaptability: Suitable for large-diameter, low and medium pressure pipeline systems, compatible with various media, and can adapt to slight pipeline displacement.No Pipe Damage: Disassembly only involves the flange ring, avoiding damage to the pipe and welding joints, extending the service life of the pipeline.Global Standard Compliance: Strictly manufactured in accordance with international and national standards, fully adapting to global market requirements.Key SpecificationsStandards: International Standard (ISO 7005), American Standard (ASME B16.5), German Standard (DIN 2501), European Standard (EN 1092-1), Japanese Standard (JIS B2220), Chinese Standard (GB/T 9118, HG/T 20592, HG/T 20615)Materials: Flange Ring: Carbon steel (A105, Q235B), Stainless steel (304, 316L); Stub End: Carbon steel (20#, 16Mn), Stainless steel (304, 316L) — customizable according to medium and working conditions.Pressure Ratings: Class 150, 300, 600; PN10, PN16, PN25, PN40Nominal Diameter: DN50 ~ DN2000 (NPS 2" ~ 80")Sealing Surface Types: RF (Raised Face), FF (Flat Face)Working Temperature: -20℃ ~ 450℃ (customizable for special requirements)ApplicationsWidely applied in petroleum, petrochemical, natural gas, water supply and drainage, HVAC, chemical engineering, marine and other industries. It is an ideal flange connection solution for large-diameter, low and medium pressure pipeline systems and scenarios requiring frequent disassembly, such as pipeline maintenance, inspection and medium replacement, and is exported to countries and regions around the world, winning unanimous recognition from global customers.As a professional manufacturer based in Cangzhou Pipeline Equipment Manufacturing Base, Hebei, China, we provide customized services for Lap Joint Flanges (including flange rings and Stub Ends) according to customer drawings, specifications, materials and standards, and offer one-stop supply and after-sales support to meet the personalized needs of global projects.

Email:

sales@flangepipefittings.com

Phone:

+86-19803175666, +86-15832782018

Inquire Now