Which standards do Cangrun pipe fittings and flanges comply with?

Butt-weld fittings are produced to JIS B2311/B2312/B2313, GB/T 12459, GB/T 13401, GB/T 10752, SH/T 3408, SY/T 0609 and HG/T 21635 in ASTM/ASME A234 and A403 materials. Flanges are supplied in American series Class 150 to Class 2500 and European series PN2.5 to PN400.

What is your manufacturing size range?

Seamless fittings from 1/2 to 24 inch (DN15–DN600), welded fittings from 4 to 78 inch (DN150–DN1900) with wall thickness up to 150 mm, and weld neck flanges up to 160 inch (DN4000).

Which materials are available?

Carbon steel ASTM/ASME A234 WPB, WPC and ST37; alloy steel ST52, 12CrMo, 15CrMo, WP1–WP12, WP11–WP22, WP5, WP91 and WP911; stainless steel ASTM/ASME A403 WP304, 304L, 304H, 304LN, 304N, 316, 316L and 316Ti.

Which flange facing types can you supply?

Flat Face (FF), Raised Face (RF), Groove (G), Male/Female (MFM) and Ring Type Joint (RJ), depending on flange type and pressure class.

Which industries use your products?

Electric power, petrochemical, chemical, pharmaceutical, boiler, heating and shipbuilding projects, supplied to contractors and distributors worldwide.

How can I receive a full product catalog?

Use the Request a Catalog page or contact our export team at Bryan@crpipes.com with your product, size, schedule, material and standard requirements.

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Product Description

Flanges are essential components used in piping systems, equipment, and structural applications to connect pipes, valves, pumps, and other machinery. They provide easy access for cleaning, inspection, or modification. Here’s a detailed description:

1. Definition

A flange is a protruding rim, collar, or rib on an object (like a pipe, beam, or vessel) used for strength, alignment, or attachment. In piping systems, flanges facilitate the assembly and disassembly of components.

2. Types of Flanges

Flanges come in various designs based on application, pressure, and connection type:

By Connection Type

Weld Neck (WN) – Welded to pipes, suitable for high-pressure systems.

Slip-On (SO) – Slides over the pipe and is welded for moderate pressure.

Socket Weld (SW) – Pipe inserts into the flange and is fillet-welded.

Lap Joint (LJ) – Used with stub ends for easy alignment in low-pressure systems.

Threaded (THD) – Screwed onto pipes without welding, ideal for small diameters.

Blind (BL) – Closes the end of a piping system for testing or future expansion.

By Face Type

Flat Face (FF) – For low-pressure applications, full contact with gasket.
Raised Face (RF) – Most common, with a raised sealing surface.
Ring-Type Joint (RTJ) – Uses a metal ring gasket for high-pressure/temperature.
Tongue & Groove (T&G) – Ensures precise alignment and sealing.

3. Materials

Flanges are made from materials compatible with the piping system:

Carbon Steel (ASTM A105) – General-purpose use.
Stainless Steel (ASTM A182 F304/316) – Corrosion-resistant.
Alloy Steel (ASTM A182 F11/F22) – High-temperature applications.
Duplex/Super Duplex – For aggressive environments.
PVC/CPVC – Used in low-pressure corrosive systems.

4. Standards & Specifications

Common standards include:

ASME/ANSI B16.5 – Up to 24" NPS ASME B16.47 – Larger-diameter (Series A/B) API 6A – Oil & gas wellhead equipment EN 1092-1 – European standard (PN/DN)

5. Pressure Ratings

Flanges are rated based on pressure-temperature capacity:

Class 150, 300, 600, 900, 1500, 2500 (ASME)
PN6, PN10, PN16, PN25, PN40 (EN)

6. Applications

Oil & Gas – Pipeline connections, refineries.

Chemical Processing – Corrosive fluid handling.

Water Treatment – Pump and valve connections.

Power Plants – High-pressure steam systems.

7. Installation & Gaskets

Flanges require proper bolting and gaskets (rubber, PTFE, spiral wound, or metal) to ensure leak-proof joints.

Author: Mila

Frequently Asked Questions (FAQ)

Q: What is the primary function of a flange in a piping system?

A flange is designed to connect pipes, valves, pumps, and other equipment to form a piping system. It allows easy assembly, disassembly, maintenance, cleaning, and inspection of system components.

Q: What are the most commonly used flange connection types?

The most widely used connection types include Weld Neck (WN) for high pressure, Slip-On (SO) for moderate pressure, Socket Weld (SW), Lap Joint (LJ), Threaded (THD), and Blind (BL) flanges used to seal pipe ends.

Q: How do I select the right material for a flange?

Material selection depends on fluid compatibility, pressure, and temperature. Carbon Steel (ASTM A105) is standard for general use, Stainless Steel (ASTM A182 F304/316) offers corrosion resistance, while Alloy Steel and PVC/CPVC suit high-temp or specialized chemical needs.

Q: What is the difference between Class and PN pressure ratings?

Class ratings (e.g., Class 150, 300, 600) follow the American standard (ASME/ANSI), whereas PN ratings (e.g., PN10, PN16, PN40) follow the European standard (EN/DIN) to specify pressure-temperature limits.

Q: Why are gaskets essential for flange installation?

Gaskets create a tight seal between two mating flange faces when properly bolted, preventing fluid or gas leaks under operational pressure and temperature variations.

Q: Which standards govern pipe flange manufacturing?

Key global standards include ASME/ANSI B16.5 for sizes up to 24", ASME B16.47 for larger diameters, API 6A for oil & gas wellhead equipment, and EN 1092-1 for European specifications.