ASTM A403 Stainless Steel Stub Ends ASME B16.9 Lap Joint Pipe Fitting 304/316L

ASTM A403 Stainless Steel Stub Ends ASME B16.9 Lap Joint Pipe Fitting 304/316L

1.Product Description

Stainless Steel Stub Ends, also known as Lap Joint Stub Ends, flange stub ends, or pipe stub ends, are a type of steel butt-weld pipe fitting. The product consists of a short section of pipe with an outwardly flared end on one side, which can be butt-welded to pipes of the same diameter and wall thickness.

Stainless Steel Stub Ends are typically used in conjunction with Lap Joint Flanges. The flared surface of the stub end can function as a gasket and provide sealing to prevent leakage. The flange ring slides over the back of the stub end and can rotate freely, facilitating bolt hole alignment during installation.

The product is available in two basic forms: Long Stub Ends and Short Stub Ends. Additionally, they are classified into Types A, B, and C based on construction. Manufacturing processes include seamless forming, welded pipe forming, and forging.

2.Product Applications

1. Pipe Connection: Stainless Steel Stub Ends are critical components in piping systems, designed to facilitate the connection of pipes and other fittings.

2. Lap Joint Flange Assembly: Used in conjunction with Lap Joint Flanges to achieve flanged connections in piping systems.

3. Frequent Disassembly Scenarios: Facilitate quick disassembly of specific sections of piping for cleaning, inspection, and rapid replacement without the need for re-welding.

4. Corrosive Media Transport: Suitable for applications with highly corrosive media. The stub end, which contacts the media, is made of corrosion-resistant high-grade materials such as stainless steel, while the external flange ring can be made of lower-grade materials like carbon steel to reduce costs.

5. Large-Diameter Piping Systems: Particularly suitable for large-diameter pipelines, as the lap joint flange can rotate freely, eliminating the difficulty of rotating entire pipe spools for bolt hole alignment.

6. Major Application Industries: Petroleum, chemical, natural gas, dairy, food and beverage, pharmaceutical, shipbuilding, and vacuum systems, etc..

​3.Product Advantages

1. Excellent Corrosion Resistance: Made of high-quality stainless steel grades such as 304/304L and 316/316L, offering outstanding corrosion resistance. 316/316L provides even better corrosion resistance due to the addition of molybdenum.

2. Cost-Effective Material Usage: Only the stub end that contacts the media needs to be made of expensive high-grade materials like stainless steel, while the flange ring can be made of lower-cost materials such as carbon steel. Savings are particularly significant for large diameters and high-pressure classes.

3. Easy Installation: The lap joint flange can rotate freely, making bolt hole alignment simple, especially suitable for piping systems with limited installation space.

4. Convenient Maintenance: Pipe sections can be easily opened for inspection, quick replacement, and cleaning without the need for re-welding.

5. High Strength and Durability: The product offers superior sturdiness, durability, and tensile strength, capable of withstanding high pressure and harsh operating conditions.

6. Lightweight Design: Stub ends weigh less than weld neck flanges of the same NPS and pressure class.

7. Reliable Sealing: The lap surface can be machined with concentric serrated grooves or spiral threads to enhance sealing and prevent leakage.

8. Wide Range of Specifications: Available in seamless, welded, and fabricated forms with a broad size range to meet diverse customer requirements.

​

4.Key Product Specifications

FAQ

1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.

2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.

4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.