304 316 SS Lap Joint Flange 1/2" To 24" ASTM A182 ASME ANSI B16.5

Lap Joint Flange LJF ASTM A182 ASME / ANSI B16.5 Class 150 to 2500

Lap Joint Flange

Attachment of the lap joint flange to the piping system requires a lap-joint stub end. The stub end can be viewed as a length of pipe sleeve with one end butt welded and the other end flared at right angle to the pipe axis. The lap-joint flange and stub end compose a two-piece composite lap joint connection.

In this lapped connection, prior to the “pipe sleeve” being welded to the adjoining pipe, and the loose-type lap joint flange slip over the straight length of the pipe sleeve and abuts against the back face of the stub end or its “flared shoulder”. It is free to spin the flange for proper alignment of bolt holes, which is used to bolt the joint together subsequently. The lap joint flange is also known as a lapped “backing flange” and the flared end is also called as “lap” of the stub end.

Product Information

Advantages & Disadvantages of Lap Joint Flange

Due to the composite two-piece configuration, the lap joint flange obtains two advantages in use. Imagine a lapped joint piping connection in which an expensive alloy (nickel, zirconium, tantalum, or titanium, etc) is required for all “wetted” parts to resist corrosion. The stub end can be made from the corrosion-resistant but expensive alloy and the lap joint flange functioning as a backing flange may be made from common carbon steels. This is more cost-effective than a complete alloy flange. On the other hand, since the lap joint flange itself is not welded to the pipe, it may rotate to align bolt holes readily and the assembly and disassembly are much easier. This facilitates the operation of a piping system that requires frequent dismantling for inspection or routine maintenance.

There are also some disadvantages for using lap joint flanges. The crevices formed between the internal surface of flange bore and the external surface of the stub ends may collect contaminates. And the collected contaminates could cause a problem and result in crevice corrosion. The longitudinal stresses, resulting from pressure, weight, and thermal expansion, may accumulate and exceed the basic allowable stress at the design temperature stipulated by ASME B31.3. Hence the lap joint flange is generally used in the circumstance, when the loads applied by the pipe to the flange connection are small. Since the lap joint flange may be of a material different from that of the stub end, possible galvanic corrosion may be incurred in some situations.

Dimension of ASME/ANSI B16.5

Kasugai Shanghai, a subsidiary of Kasugai Group headquartered in Osaka, Japan, was established in 2003 as a representative office in Shanghai, China, and was upgraded to a company in 2008. Kasugai Shanghai serves as an important force of Kasugai Group in Asia, and over the past 20 years, it has become a key player in the industrial pipes, fittings, flanges, and valves market.

Kasugai Shanghai leverages the resources and manufacturing capabilities of local suppliers in China to provide a wide range of products, including stainless steel, carbon steel, duplex/super duplex steel, alloy steel, nickel alloy, and titanium alloy, according to various international standards such as ASTM/ASME/ANSI, JIS, EN, and DIN. The company also has a local support team and an on-site quality inspection team to ensure that products meet the specifications and quality requirements of customers.

With the support of high-quality local suppliers and a strong commitment to customer satisfaction, Kasugai Shanghai strives to provide reliable products and services to customers in Asia and beyond. Kasugai Group's establishment of Kasugai Shanghai and other international operations demonstrates their proactive approach to globalization and their commitment to meeting the needs of customers in a rapidly changing global market.

Kasugai Group Company Profile:

Foundation : June, 1925

Legal Representative : Akinori Kasugai

Number of employees : 140 persons (150 persons including employees of the affiliates) As of March 21, 2023

Scope of business : wholesaler and trade firm of industrial pipe/tube, fittings, flanges and valves

Kasugai Group Locations:

Head Office

4-14-2 Shinmachi, Nishi-ku, Osaka 5500013, Japan

TEL: 81-6-6538-7281

FAX: 81-6-6538-2273

E-MAIL: contact@kasugai-group.co.jp

Shanghai

Rm. A8415 Building A8, No. 808 Hongqiao Road, Xuhui District, Shanghai 200030, China.

TEL: 86-21-6447-1967

FAX: 86-21 6447-7841

E-MAIL: zhanghb@kasugai-group-co.jp

Other Branch Offices and Joint Ventures:

Fukuoka, Kitakyushu, Tokai, Kyoto, Shunan, Tokyo, USA (Watchung, N.J.), Jiangyin (Jiangsu, China)

Our Strengths:

Since our foundation in 1925, we have continuously taken steps to further grow our businesses. Global capabilities, professionalism, and trust. These three strengths are the reason that customers continue to choose Kasugai, regardless of the period.

-Global capabilities

We embarked on overseas procurement ahead of our competitors in the industry and have established a supplier network that can meet a variety of market demands. We are successfully chosen by many overseas customers
as a global procurement partner.

- Professionalism

Leveraging expertise cultivated over many years, we deliver optimal products to the optimal place at the optimal time. Our excellent information gathering and problem-solving abilities are also invaluable for solving customer issues.

- Trust

We provide smooth, prompt services by cultivating solid relationships of trust with suppliers. We believe that building stronger partnerships is the source of our growth.