CNG manufactures grooved pipe fittings for fire protection systems, including rigid and flexible couplings, elbows, tees, mechanical outlets, reducers, end caps and grooved flange adapters. Our product range supports fire sprinkler piping, hydrant networks, fire pump rooms, risers and other water-based fire protection installations.
Fire protection contractors, EPC companies, distributors and project procurement teams can source compatible grooved components from one manufacturer. Product selection can be matched to the required pipe size, working pressure, surface finish, gasket material and applicable approval.
A fire protection piping network requires more than one type of coupling. CNG provides a broad range of grooved couplings, grooved pipe fittings, mechanical branch outlets and grooved flanges for assembling complete fire sprinkler piping systems.
Rigid couplings create restrained joints where pipe movement and angular deflection need to be limited. They are commonly selected for straight pipe runs, risers, equipment rooms and other locations where a stable pipe joint is required.
CNG rigid coupling options include ductile iron housings, carbon steel bolts and different coating configurations. View our rigid grooved coupling for fire sprinkler systems for application and purchasing information.
Flexible couplings permit controlled pipe movement and angular deflection according to the selected coupling design and installation conditions. They may be specified around pumps, equipment connections, changes in direction and other locations where vibration or limited movement must be considered.
Explore our flexible grooved couplings for fire protection systems and confirm the required model, size, pressure rating and approval before ordering.
Fire sprinkler piping requires fittings that route water through mains, risers and branch lines. CNG supplies 90°, 45°, 22.5° and 11.25° elbows, equal and reducing tees, crosses and related configurations.
Our grooved pipe fittings are available for different directional changes and branch arrangements. Buyers can review the 90° grooved elbow and grooved equal tee for detailed dimensions and available configurations.
Mechanical tees provide a practical way to create branch outlets from the main pipe. They are frequently used when adding sprinkler branches, drop nipples, gauges or other outlets without installing a full conventional tee.
CNG supplies grooved-outlet, threaded-outlet and U-bolt configurations. Review our grooved mechanical tee and specify the main pipe size, outlet size, connection type and required hole size when requesting a quotation.
Grooved reducers connect pipe sections with different diameters. Concentric and eccentric configurations can be selected according to piping layout, flow requirements and project specifications.
The grooved concentric reducer is available in multiple inlet and outlet combinations for sprinkler mains, risers and equipment connections.
Grooved end caps close the end of a pipe run and can support system termination, testing or future expansion requirements. Buyers should select the cap according to pipe OD, pressure rating, surface finish and project approval requirements.
View the available ductile iron grooved end caps.
Grooved flange adapters provide transitions between grooved piping and flanged valves, pumps or other equipment. They simplify equipment connection while maintaining a grooved piping layout.
Explore our grooved flanges and flange adapters for available connection options.
The correct component depends on the location and function of the joint. The following table provides an initial selection guide.
| Piping Requirement | Recommended Product Direction |
|---|---|
| Restrained joint with limited movement | Rigid grooved coupling |
| Controlled movement or vibration consideration | Flexible grooved coupling |
| Change pipe direction | 90°, 45°, 22.5° or 11.25° grooved elbow |
| Divide flow into equal branches | Equal grooved tee |
| Create a smaller branch connection | Reducing tee or mechanical tee |
| Connect different pipe diameters | Grooved concentric or eccentric reducer |
| Connect to a pump, valve or flanged equipment | Grooved flange adapter |
| Close a pipe end | Grooved end cap |
| Add an outlet to an existing main line | Mechanical tee or U-bolt outlet |
Final selection must be based on the piping drawing, pipe OD, working pressure, connection standard, gasket compatibility and required product listing.
CNG fire protection grooved pipe fittings can be selected for different parts of a water-based fire protection system, subject to the applicable model, listing and project specification.
Grooved couplings and fittings are used to assemble sprinkler mains, risers, branch lines and equipment connections in commercial, industrial and infrastructure projects.
Wet, dry and pre-action systems may have different gasket, listing and installation requirements. Buyers should identify the system type when requesting product confirmation.
Pump rooms require connections between pipework, pumps, valves, manifolds and other equipment. Rigid couplings, flexible couplings and flange adapters can be selected according to joint restraint, vibration and equipment connection requirements.
Grooved fittings can be used in fixed fire hydrant piping networks, including mains, risers and distribution branches. These products are intended for grooved fire protection piping and should not be confused with fire hose couplings or hydrant outlet adapters.
Elbows, tees, reducers, mechanical outlets and couplings can be configured for water distribution piping according to the approved system design and required product specifications.
CNG products support fire protection piping procurement for high-rise buildings, warehouses, production facilities, logistics centers, public buildings and infrastructure projects. Product suitability must be confirmed against the applicable design, pressure and approval requirements.
Typical CNG grooved product configurations include the following options. Availability and performance ratings vary by product model and size.
| Item | Available Product Direction |
|---|---|
| Housing and fitting material | Ductile iron conforming to ASTM A536 Grade 65-45-12 on applicable products |
| Bolts and nuts | Carbon steel options |
| Gasket materials | EPDM, nitrile or silicone rubber, depending on product and service requirements |
| Rated pressure | Selected products are listed on the website within the 300–500 PSI range; confirm by model and size |
| Surface treatment | Epoxy powder coating, electrophoretic coating or hot-dip galvanizing |
| Color | Red and other project-specific color options |
| Connections | Grooved, threaded outlet or flanged transition, depending on product type |
Do not select a product only by nominal pipe size. Pipe outside diameter, groove specification, operating pressure, gasket material and certification requirements should also be confirmed.
Selected CNG grooved product series are available with cULus listings and FM approvals. Approval coverage can vary by product type, model, nominal size, pressure rating and configuration.
When requesting UL Listed or FM Approved grooved pipe fittings, please provide:
Required approval or listing;
Product type and model, if specified;
Nominal pipe size and actual pipe OD;
Required working pressure;
Surface finish;
Gasket material;
Project country or applicable specification.
CNG can then identify the appropriate product direction and provide the corresponding technical or approval documentation available for the selected model.
View UL/FM Flexible Grooved Couplings
CNG, Hebei Dikai Piping Products Co., Ltd., was founded in 2002 and specializes in grooved couplings, fittings, mechanical tees and grooved flanges.
Buyers can source couplings, elbows, tees, crosses, reducers, mechanical outlets, end caps and flange adapters from one product system, reducing the complexity of coordinating multiple suppliers.
CNG reports an annual casting production capacity of more than 50,000 tons and a production base covering more than 110,000 square meters, supporting project orders and distributor purchasing requirements.
CNG operates testing facilities covering metal, rubber, chemical, hydraulic and piping-system inspection. Available testing capabilities include material analysis, hardness testing, pressure testing and leakage testing.
Products can be selected with different coatings, gasket materials, outlet types and connection configurations according to the project environment and technical specification.
For approval-sensitive projects, buyers can request available certificates, product specifications and model information before confirming an order.
Common products include rigid and flexible couplings, grooved elbows, equal and reducing tees, mechanical tees, reducers, end caps and flange adapters. The required combination depends on the sprinkler layout and equipment connections.
Rigid couplings are used where a restrained joint is required. Flexible couplings permit controlled movement according to their design. The final selection should follow the system design, installation location and applicable fire protection requirements.
No certification claim should be applied to every product or size automatically. Listing and approval coverage can vary by product family, model, size and pressure rating. Buyers should request confirmation for the exact products included in the BOQ.
Provide the main pipe OD, outlet size, grooved or threaded outlet requirement, working pressure, required hole size and applicable approval. The drilled opening must match the manufacturer’s product specification.
Selected products are available with epoxy powder coating, electrophoretic coating or hot-dip galvanizing. Available finish options should be confirmed for the required model, size and order quantity.
CNG manufactures grooved couplings, fittings, mechanical tees and grooved flanges, allowing project buyers and distributors to source multiple product categories through one supplier.
Send CNG your BOQ, pipe sizes, pressure requirements, required approvals, coating preference and delivery destination. Our team will review the requested product range and provide the appropriate model and quotation information.
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