For more than 20 years, CNG has been a trusted manufacturer of grooved piping systems serving fire protection projects around the world. Our products are widely applied in commercial buildings, industrial facilities, logistics warehouses, airports, hospitals, data centers, power plants, petrochemical facilities, and other critical infrastructures where reliable fire safety is essential. From municipal fire water supply networks to complex automatic sprinkler systems, we provide complete grooved piping solutions that ensure secure, efficient, and long-lasting performance.
Our project portfolio demonstrates extensive experience in supporting fire sprinkler systems, fire hydrant systems, water spray systems, water mist systems, foam fire suppression systems, and other specialized fire protection applications. With a comprehensive product range including grooved couplings, grooved fittings, mechanical tees, grooved flanges, valves, and accessories, CNG enables customers to build complete piping networks from a single reliable source, simplifying procurement and ensuring full compatibility across every connection.
Every project is supported by strict quality management, advanced manufacturing technology, and internationally recognized certifications including UL, FM, CE, ISO, and CCC. Our engineering team works closely with distributors, contractors, EPC companies, and fire protection system integrators to recommend the most suitable products for different pressure ratings, installation environments, and project specifications.
Whether the project involves a high-rise commercial complex, manufacturing plant, warehouse distribution center, or municipal infrastructure, CNG delivers durable grooved piping solutions that reduce installation time, minimize maintenance requirements, and improve overall system reliability. Through proven manufacturing capability, consistent product quality, and responsive technical support, we help customers successfully complete fire protection projects that meet the highest international standards for safety and performance.
Grooved Piping System Applications
CNG provides grooved piping system components for fire protection, HVAC, commercial buildings, industrial facilities, municipal utilities and transportation infrastructure.
Our product range includes grooved couplings, grooved fittings, mechanical tees and grooved flanges. Buyers can source individual products or combine multiple product categories under one project-based order according to piping drawings, technical specifications and bills of materials.
Explore the application areas below to identify suitable grooved piping components for your operating conditions, installation requirements and procurement plan.
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Grooved Piping Solutions by Application
The correct grooved piping solution depends on more than pipe size. Working pressure, operating temperature, transported medium, pipe material, gasket compatibility, surface treatment and required approvals should all be considered before product selection.
Fire Protection Systems
Grooved piping components are widely used in fire sprinkler, fire hydrant, fire water supply, water spray, water mist and other fire protection piping systems.
CNG supplies rigid and flexible couplings, grooved elbows and tees, mechanical branch outlets, reducers, end caps and flange adaptors for fire protection projects.
Products can be selected according to:
Pipe size and outside diameter
System working pressure
Sprinkler or hydrant system design
Required gasket material
Surface treatment
Applicable UL, FM or other approval requirements
Project quantity and installation schedule
Certification availability should be confirmed by product model, size and required market before ordering.
Explore Grooved Piping for Fire Protection
Commercial Buildings and HVAC
Grooved piping systems can be used in chilled water, condenser water, heating water, equipment-room and other mechanical piping installations in commercial buildings.
Typical applications include:
Office buildings
Hotels and shopping centers
Hospitals
Data centers
High-rise buildings
Airports and public venues
Central heating and cooling systems
Pump and equipment rooms
Rigid couplings may be considered where restrained joints are required, while flexible couplings can be selected where the system design requires controlled movement or vibration accommodation. Grooved flanges provide transitions to pumps, valves and other flanged equipment.
Explore HVAC and Building Piping Solutions
Industrial Piping Systems
Industrial grooved piping components can be configured for utility water, cooling water, compressed air, process-support pipelines and other compatible services.
Industrial projects often involve more demanding operating conditions. Before selecting products, buyers should provide:
Transported medium
Working and test pressure
Minimum and maximum temperature
Pipe material and outside diameter
Required coupling type
Gasket compatibility
Internal and external corrosion conditions
Surface coating requirements
Applicable standards and approvals
CNG can review the requested product list and organize compatible couplings, fittings, mechanical tees and flange adaptors for project procurement.
Explore Industrial Grooved Piping Solutions
Municipal and Transportation Infrastructure
Grooved piping components are also used in municipal facilities, transportation hubs, public buildings and other large infrastructure projects.
Typical project environments include:
Airports
Metro and railway facilities
Tunnels
Municipal utility buildings
Water supply facilities
Public venues
Government buildings
Large transportation terminals
Infrastructure projects commonly require mixed-product BOM supply, consistent batch identification, technical documentation, export packaging and phased delivery according to the construction schedule.
Explore Infrastructure Piping Solutions
Grooved Piping System Components
CNG supplies the core connection components required to build grooved piping networks.
Grooved Couplings
Grooved couplings connect grooved-end pipes and fittings through a housing, gasket, bolts and nuts.
Available configurations include rigid couplings, flexible couplings, reducing couplings and heavy-duty couplings for different pipeline requirements.
Grooved Fittings
Grooved fittings are used to change pipeline direction, create branches, transition between pipe diameters or close pipeline ends.
The product range includes elbows, tees, crosses, reducers, end caps, nipples and other grooved pipe fittings.
Mechanical Tees and Crosses
Mechanical tees and crosses create branch outlets from a main pipeline. They can simplify branch connection in suitable new installation, expansion and retrofit projects.
Available options include grooved, threaded and U-bolt mechanical outlet configurations.
Grooved Flanges
Grooved flanges and flange adaptors connect grooved pipework to flanged valves, pumps, filters, tanks and other equipment.
They provide a practical transition where grooved and conventional flange connections are used in the same piping system.
Select Components According to Project Requirements
A product used successfully in one application may not automatically be suitable for another. Procurement teams should confirm the following information before placing an order:
| Selection Factor | Information to Provide |
|---|---|
| Application | Fire protection, HVAC, industrial or infrastructure |
| Pipe information | Nominal size, outside diameter and pipe material |
| Operating conditions | Working pressure, test pressure and temperature |
| Transported medium | Water, air or other specified medium |
| Joint requirement | Rigid, flexible, reducing or equipment transition |
| Gasket | Required material or medium compatibility |
| Surface treatment | Painted, epoxy-coated, galvanized or specified finish |
| Approval | UL, FM, CE, CCC or other project requirement |
| Procurement | Quantity, delivery schedule and packaging requirements |
For complex projects, send the piping schedule, drawings or BOM so the required product information can be reviewed before quotation.
Project-Based Procurement Support
CNG supports distributors, contractors, EPC companies, system integrators and project procurement teams with both individual product orders and mixed grooved piping component packages.
BOM Review
Send your product schedule or bill of materials with sizes, quantities and technical requirements. The requested items can be organized by product category, connection type, pressure rating, gasket and surface finish.
Combined Product Quotation
Grooved couplings, fittings, mechanical tees and flanges can be included in one project quotation, helping buyers consolidate compatible components and reduce communication with multiple suppliers.
Technical Documentation
Available documentation may include product specifications, dimensional data, material information, inspection records and applicable certificates.
Required documents should be stated during the enquiry stage so their availability can be confirmed for the selected models.
Coating and Color Options
Depending on the product and order requirements, surface treatment options may include painted, epoxy-coated, electrophoretic-coated or galvanized finishes.
Custom colors can be discussed for suitable quantities. The coating type should be selected according to the installation environment and corrosion-protection requirements, rather than appearance alone.
Production and Delivery Planning
Large projects may require several production and delivery batches. Buyers can provide their installation schedule, destination and required quantities so packaging and shipment can be planned around project milestones.
Selected Grooved Piping Project References
CNG products have been presented for a range of public building, transportation and infrastructure applications.
Selected project references currently displayed include:
National Stadium – Bird’s Nest
Beijing Daxing International Airport
Guangzhou Baiyun Airport
Qingdao Metro
Shandong Provincial Government Office Building
Wuhan Greenland Center Building
Each project card should display the project name, application category, location and supplied product categories where this information can be verified.
The exact supply scope, product models and application systems should not be published unless supported by confirmed project records.
Why Choose CNG?
CNG, Hebei DIKAI Piping Products Co., Ltd., has manufactured grooved piping products since 2002.
Our project supply capabilities include:
Grooved couplings, fittings, mechanical tees and flanges from one manufacturer
Annual casting production capacity exceeding 50,000 tons
Production facilities covering more than 110,000 square metres
Automatic moulding, coating and assembly resources
Independent inspection and quality-control capabilities
Batch identification and traceability management
Standard and customized surface finishes
Bulk-order and mixed-product supply support
Export packaging and phased delivery coordination
Technical communication for project specifications
CNG lists cULus, FM, ISO, CCC and CE among its certifications and approvals. Applicable certification must be checked against the exact product model, size and intended market.
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Frequently Asked Questions
Can I purchase couplings, fittings, mechanical tees and flanges together?
Yes. Multiple grooved piping component categories can be combined under one project quotation according to your BOM. Individual product categories can also be ordered separately.
Does CNG supply a complete grooved piping system?
CNG primarily manufactures and supplies grooved piping system components. The available supply package should be confirmed according to your product list. Pipes, pumps, valves, supports, installation and engineering design should not be assumed to be included unless separately confirmed.
Which information is required for product selection?
Provide the application, pipe size, outside diameter, pipe material, working pressure, temperature, transported medium, required gasket, surface treatment and applicable approvals.
How do I choose between rigid and flexible couplings?
The choice depends on the required joint restraint, system movement, vibration, pipe support arrangement and design specification. Final selection should follow the project engineer’s requirements.
Can CNG supply products with project-specific coatings?
Different painted, coated and galvanized finishes may be available. Specify the installation environment, required coating and color reference when requesting a quotation.
Can a large project be delivered in separate batches?
Phased delivery can be discussed according to production quantity, project schedule, packaging requirements and destination.
Request an Application-Specific Quotation
Planning a fire protection, HVAC, industrial or infrastructure piping project?
Send us your BOM, piping schedule or product requirements. Please include:
Application and project type
Product names and quantities
Pipe sizes and outside diameters
Working pressure and temperature
Transported medium
Required gasket and coating
Required standards or approvals
Country and destination port
Delivery schedule
Drawings or technical specifications
CNG will review the submitted information and prepare a quotation for the required grooved piping system components.
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