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

A pipe reducer is a fitting used to connect pipes of different diameters. Its primary function is to achieve a reduced diameter connection within a piping system. It can smoothly change the flow rate and pressure of the medium within the pipe, ensuring smooth operation of the piping system.

Main Types

1. Concentric Reducer

Conical shape with a consistent centerline
Used for vertical pipes or where top/bottom flushing is required
Reduces cavitation and turbulence

2. Eccentric Reducer

One side is straight, the other is beveled
Commonly used in horizontal pipes to prevent gas accumulation or liquid sedimentation
Categories include "flush top" and "flush bottom" types

Material Options

We offer pipe reducers in a variety of materials to meet different application requirements:

Carbon steel (ASTM A234 WPB)
Stainless steel (304, 316, 316L, etc.)
Alloy steel (A234 WP5, WP9, WP11, etc.)
Duplex stainless steel
Nickel-based alloys

Manufacturing Standards

Products comply with the following international standards:

ASME B16.9 (factory-made forged steel butt-weld pipe fittings)
ANSI/ASME B16.11 (Forged steel pipe fittings for socket welding and threaded connections)
MSS SP-43 (Forged stainless steel butt-weld pipe fittings)
DIN 2616 (German Standard)
JIS B2311 (Japanese Standard)

Technical Specifications

Size range	1/2" to 48" (DN15-DN1200)
Pressure rating	Sch5s to Sch160 XXS
Connection methods	Butt weld, socket weld, threaded
Surface treatment	Sandblasting, pickling, polishing (customizable upon request)

Applications

Pipe Reducers are widely used in:

Oil and gas industry
Chemical and petrochemical plants
Power industry
Water treatment and distribution systems
Pharmaceutical and food processing
HVAC systems

Product Advantages

Precision manufacturing: Advanced processes ensure precise dimensions and low flow resistance
Diverse options: Available in a variety of sizes, materials, and pressure ratings
Strict quality control: Each batch undergoes rigorous testing
Corrosion resistance: Special materials are available for corrosive environments
Long life: High-quality materials and workmanship ensure product life

Selection Guide

When selecting a suitable pipe reducer, consider:

Media type in the piping system
Operating temperature and pressure
Corrosive environment requirements
Connection method
Flow rate requirements

Frequently Asked Questions (FAQ)

QWhat is the main difference between a concentric and an eccentric pipe reducer?

A concentric reducer shares a common centerline between the larger and smaller ends, making it ideal for vertical piping. An eccentric reducer has an offset centerline with one flat side, which prevents gas accumulation or liquid trapping in horizontal piping installations.

QWhen should I use a flush top vs. flush bottom eccentric reducer?

Use "flush top" (flat side on top) in horizontal liquid lines to prevent air/gas pockets from accumulating. Use "flush bottom" (flat side on bottom) in horizontal gas or vapor lines to allow condensate or sediment to drain freely.

QWhich connection method is best for high-pressure industrial applications?

Butt-weld pipe reducers (complying with ASME B16.9) are generally preferred for high-pressure, high-temperature critical applications due to their superior structural strength and leak-proof joint design.

QHow do I choose the correct material grade for a pipe reducer?

Material selection depends on the fluid medium, working pressure, temperature, and environmental corrosion risk. Carbon steel (ASTM A234 WPB) works for general utility services, stainless steel (304/316) for corrosive or hygienic media, and alloy steel for high-temperature service.

QAre custom sizes and surface treatments available for pipe reducers?

Yes, pipe reducers can be manufactured in non-standard sizes outside the standard 1/2" to 48" range, with customized surface treatments such as sandblasting, pickling, polishing, or special protective coatings.

Mila