Split Flange Specification

Split Flange Manufacturer – Precision Engineering for Demanding Industrial Systems

Product Highlights

Fast Installation, Zero Downtime: Split design allows 70% faster assembly compared to welded flanges – ideal for maintenance-heavy environments.

Bulk Order Savings: MOQ 50 units with 20-40% volume discounts – tailored for oil rigs and shipbuilding projects.

Global Compliance: ASME B16.5, API 6A, PED 2014/68/EU certified – guaranteed acceptance in EU, US, and MEA markets.

Why Choose Our Split Flanges?

Heavy-Duty Performance

Material: ASTM A105 carbon steel / ASTM A182 F316 stainless steel – withstands up to 5,000 PSI and sub-zero temperatures.

Sealing: RF (Raised Face) or RTJ (Ring-Type Joint) surfaces with spiral-wound graphite gaskets (EN 1514-1).

Cost & Time Efficiency

No Pipe Cutting Required: Retrofit existing pipelines without system shutdowns – save up to $500/hr in lost production.

Reusable Design: Disassemble and reassemble flanges 10+ times without seal degradation.

Customization & Traceability

Non-Standard Sizes: 1/2” to 24” (DN15-DN600) with Class 150 to 2500 pressure ratings.

Laser Marking: Permanent engraving of material grade, pressure class, and batch number for full traceability.

Typical Applications

Style 321 grooved split flanges can be considered for compatible water-based and mechanical piping systems, including:

• Fire sprinkler piping

• Fire hydrant and fire water systems

• HVAC chilled water systems

• HVAC condenser and heating water systems

• Pump rooms

• Water supply systems

• Water treatment facilities

• Commercial building mechanical systems

• Municipal utility installations

• Connections to flanged valves

• Connections to pumps and strainers

• Industrial utility water systems

Final suitability depends on the transported medium, working pressure, operating temperature, gasket material, flange standard and required approval.

FAQ

Q: Are your split flanges compatible with existing pipeline materials?

Yes! We match flange materials (e.g., ASTM A105 to A106 pipes) to prevent galvanic corrosion.

Q: Can I get a sample before bulk orders?

Free split flange samples (1-2 pcs) provided – only pay shipping costs.

Q: How to handle on-site leaks?

24/7 technical support + 48-hour emergency replacement service for defective units.

Key Advantages

Fast Grooved-to-Flanged Transition

The Style 321 split flange provides a direct transition between grooved piping and flanged equipment without adding an unnecessary section of welded flanged pipe.

Two-Piece Split Construction

The split housing simplifies positioning around the grooved pipe end and can make installation more convenient in pump rooms, equipment areas and space-limited piping layouts.

ANSI and PN Connection Options

Oval flange holes help accommodate applicable ANSI Class 125/150 and PN16 flange patterns. Compatibility must still be checked against the pipe outside diameter, equipment flange and dimensional drawing.

Ductile Iron Housing

The housing is manufactured from ASTM A536 Grade 65-45-12 ductile iron, providing the strength and toughness required for mechanical grooved piping connections.

Multiple Surface Treatments

Available finishes may include hot-dip galvanizing, electrophoretic coating and epoxy powder coating. The finish should be selected according to the installation environment and corrosion-protection requirements.

Project and Bulk Supply

Different sizes, coatings and related grooved flange products can be combined under one quotation for distributors and project procurement teams.

ANSI and PN Flange Compatibility

Style 321 grooved split flanges are designed for applicable ANSI Class 125/150 and PN16 flange connections.

The currently published product information also indicates:

• DN50 to DN80 may be available for selected PN10 and PN25 nominal flange patterns.

• DN100 to DN150 may be available for selected PN10 nominal flange patterns.

Because flange drilling can differ by nominal size, region and pressure designation, buyers should provide:

• Nominal pipe size

• Actual pipe outside diameter

• Flange standard

• Pressure class

• Number of flange holes

• Bolt-hole diameter

• Bolt-circle diameter

• Valve or equipment drawing

CNG will confirm compatibility before quotation or production.

How to Select a Grooved Split Flange

1. Confirm the Pipe Outside Diameter

Do not select the flange only by nominal pipe size. Provide the actual outside diameter of the grooved pipe.

2. Identify the Flange Standard

Confirm whether the connecting valve or equipment uses ANSI Class 125/150, PN10, PN16, PN25 or another flange pattern.

3. Provide the Working and Test Pressure

The required pressure must be compared with the rating available for the selected flange size and certification.

4. State the Transported Medium

The medium determines whether EPDM, nitrile, silicone or another available gasket material should be considered.

5. Confirm the Operating Temperature

Gasket and coating selection should account for the minimum and maximum system temperatures.

6. Select the Surface Finish

Specify whether the project requires painted, electrophoretic-coated, epoxy-coated or hot-dip galvanized components.

7. Identify Certification Requirements

If UL, FM, CCC, CE or another approval is required, state it in the enquiry. Approval coverage should be checked by product model and size.

8. Provide Quantity and Delivery Information

Include the quantity for each size, destination country or port, required delivery date and packaging requirements.

Grooved Split Flange vs Flange Adaptor

Both products connect grooved piping to flanged components, but their structures and installation methods differ.

View our Grooved Flanges range or compare this product with the Flange Adaptor.

Material, Gasket and Coating Options

Housing

The Style 321 housing is manufactured from ASTM A536 Grade 65-45-12 ductile iron.

Bolts and Nuts

Carbon steel bolts and nuts are supplied according to the confirmed product configuration.

Gaskets

Available gasket materials may include:

• EPDM for compatible water-service applications

• Nitrile for compatible oil-containing or air applications

• Silicone rubber for selected temperature requirements

Gasket selection must be based on the transported medium, concentration, pressure and temperature.

Surface Treatment

Available surface finishes may include:

• Hot-dip galvanized

• Electrophoretic coated

• Epoxy powder coated

• Standard painted finish

• Customized colors for qualifying orders

Color should not be used as the only corrosion-protection specification. Buyers should identify the required coating system and installation environment.

Quality Inspection

CNG applies material, dimensional and performance inspections throughout production.

Inspection items for grooved split flanges may include:

• Raw-material verification

• Chemical composition inspection

• Metallographic inspection

• Dimensional inspection

• Pipe-groove engagement inspection

• Flange-hole pattern inspection

• Bolt and nut inspection

• Gasket inspection

• Coating-thickness inspection

• Pressure and leakage testing

• Product marking

• Batch identification and traceability

Required inspection records or certificates should be stated before order confirmation.

Bulk and Project Supply

CNG supports bulk grooved split flange orders for distributors, contractors and project procurement teams.

Purchasing options may include:

• Multiple sizes in one order

• Style 321 split flanges and flange adaptors in one quotation

• Standard or customized surface finishes

• OEM product marking

• Customized cartons or pallet packaging

• Batch documentation

• Project-based production planning

• Phased delivery

• Export shipment coordination

Send a size list or project BOM to confirm MOQ, packaging, production schedule and delivery terms.

Why Source Grooved Split Flanges from CNG?

CNG, Hebei DIKAI Piping Products Co., Ltd., has manufactured grooved piping products since 2002.

Our manufacturing and project supply resources include:

• More than 50,000 tons of annual casting production capacity

• A production area exceeding 110,000 square metres

• Automatic moulding and coating facilities

• Independent metal, rubber, chemical and hydraulic laboratories

• Pressure and leakage testing capabilities

• Batch identification and traceability

• Grooved couplings, fittings, mechanical tees and flanges from one manufacturer

• Bulk and mixed-product project supply

• Export packaging and delivery coordination

Product approvals and certificates must be confirmed against the exact model, size and destination market.

Learn More About CNG
View Technical Support

Frequently Asked Questions

What is a grooved split flange used for?

It connects a grooved pipe end to a flanged valve, pump, strainer or other item of pipeline equipment.

Is Style 321 a hydraulic split flange?

No. It is a ductile iron grooved piping component. It should not be confused with SAE Code 61 or Code 62 hydraulic split flanges.

Is the split flange compatible with ANSI Class 150?

Style 321 is designed for applicable ANSI Class 125/150 flange connections. Compatibility should be confirmed according to pipe size and the equipment flange drawing.

Is a PN16 version available?

PN16 compatibility is listed for this product. Selected sizes may also accommodate other PN patterns, but dimensions must be confirmed before ordering.

What is the working pressure?

The currently published range is 300–500 PSI. The exact rated pressure depends on the selected size, model and certification.

Which gasket should I choose?

Gasket selection depends on the transported medium, operating temperature and pressure. Provide the complete service conditions for confirmation.

Can I order galvanized grooved split flanges?

Hot-dip galvanized, electrophoretic and epoxy powder coated finishes are listed as available options. Confirm availability, coating requirement and quantity when requesting a quotation.

Can different sizes be combined in one bulk order?

Yes. Different sizes and related grooved flange products can be included in one project or distributor quotation, subject to production and packaging confirmation.

Are UL or FM-approved sizes available?

CNG lists UL and FM among its product approvals. Coverage must be verified by Style 321 model, size and intended market before ordering.

What should I send for a quotation?

Provide the pipe outside diameter, flange standard, pressure class, working pressure, gasket requirement, coating, required certification, quantity and delivery destination.

Request a Grooved Split Flange Quotation

Looking for a grooved split flange manufacturer for a bulk, distribution or project order?

Send CNG the following information:

• Pipe size and outside diameter

• ANSI or PN flange standard

• Working and test pressure

• Transported medium

• Operating temperature

• Gasket requirement

• Surface treatment

• Required certification

• Quantity by size

• Destination country or port

• Required delivery date

• Product drawing or BOM

Our team will review the specification and prepare a quotation for the required Style 321 grooved split flanges.

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