Rigid grooved coupling
·Standard: ANSI / UL 213 UL / FM
·Material: Ductile iron ASTM A536, 65-45-12
· Bolt & nut: Carbon steel
· Gasket: EPDM, nitrile, silicone rubber, etc
·Rated pressure: 300 – 500 psi
·Surface: Red painting / hot dip galvanized
·Size range: 1″ – 24″
description
Available size
| Size | Dimension (mm) | Bolting (n x bolt size) | |||||
| Inch | DN | mm | F | L | H | ANSI | EN |
| 1″ | 25 | 33.7 | 59 | 100 | 44 | 2 – 3/8″ × 55 | 2 – M10 × 57 |
| 1-1/4″ | 32 | 42.4 | 66 | 110 | 45 | 2 – 3/8″ × 55 | 2 – M10 × 57 |
| 1-1/2″ | 40 | 48.3 | 72 | 115 | 45 | 2 – 3/8″ × 55 | 2 – M10 × 57 |
| 2″ | 50 | 60.3 | 85 | 131 | 45 | 2 – 3/8″ × 55 | 2 – M10 × 57 |
| 2-1/2″ | 65 | 73.0 | 98 | 145 | 45 | 2 – 3/8″ × 55 | 2 – M10 × 57 |
| 2-1/2″ | 65 | 76.1 | 101 | 147 | 45 | 2 – 3/8″ × 55 | 2 – M10 × 57 |
| 3″ | 80 | 88.9 | 115 | 170 | 46 | 2 – 1/2″ × 70 | 2 – M12 × 70 |
| 4″ | 100 | 114.3 | 146 | 200 | 52 | 2 – 1/2″ × 70 | 2 – M12 × 70 |
| 5″ | 125 | 139.7 | 170 | 238 | 52 | 2 – 5/8″ × 85 | 2 – M16 × 85 |
| 5″ | 125 | 141.3 | 172 | 237 | 52 | 2 – 5/8″ × 85 | 2 – M16 × 85 |
| 6″ | 150 | 165.1 | 198 | 266 | 52 | 2 – 5/8″ × 85 | 2 – M16 × 85 |
| 6″ | 150 | 168.3 | 202 | 270 | 52 | 2 – 5/8″ × 85 | 2 – M16 × 85 |
| 8″ | 200 | 219.1 | 260 | 346 | 62 | 2 – 3/4″ × 115 | 2 – M20 × 115 |
| 10″ | 250 | 273.0 | 327 | 420 | 63 | 2 – 7/8″ × 125 | 2 – M22 × 125 |
| 12″ | 300 | 323.9 | 378 | 466 | 63 | 2 – 7/8″ × 140 | 2 – M22 × 140 |
| 14″ | 350 | 355.6 | 415 | 510 | 72 | 3 – 7/8″ × 140 | 3 – M22 × 140 |
| 16″ | 400 | 406.4 | 468 | 575 | 72 | 3 – 7/8″ × 140 | 3 – M22 × 140 |
| 18″ | 450 | 457.2 | 508 | 608 | 78 | 3 – 7/8″ × 140 | 3 – M22 × 140 |
| 20″ | 500 | 508.0 | 563 | 660 | 78 | 4 – 7/8″ × 140 | 4 – M22 × 140 |
| 24″ | 600 | 609.6 | 668 | 772 | 78 | 4 – 1″ × 140 | 4 – M24 × 140 |
Specification
ASTM A135 (BLACK & GALVANISED) SCH10
| N.D. | O.D. | WALLTHICKNESS | Tolerance+/- | TEST PRESSURE |
| Inch | mm | mm | Kg/m | mp |
| 3/4 | 26.8 | 2.11 | 1.28 | 17.24 |
| 1 | 33.5 | 2.77 | 2.09 | 17.24 |
| 1-1/4 | 42.2 | 2.77 | 2.7 | 16.55 |
| 1-1/2 | 48.3 | 2.77 | 3.1 | 14.48 |
| 2 | 60.3 | 2.77 | 3.93 | 11.72 |
| 2-1/2 | 73 | 3.05 | 5.26 | 10.34 |
| 3 | 88.9 | 3.05 | 6.45 | 8.27 |
| 3-1/2 | 101.6 | 3.05 | 7.41 | 6.89 |
| 4 | 114.3 | 3.05 | 8.36 | 6.21 |
| 5 | 141.3 | 3.40 | 11.58 | 5.86 |
| 6 | 168.3 | 3.40 | 13.84 | 5.02 |
| 8 | 219 | 4.80 | 15.41 | 4.26 |
ASTM A135 (BLACK & GALVANISED) SCH40
| N.D. | O.D. | WALLTHICKNESS | Tolerance+/- | TEST PRESSURE |
| Inch | mm | mm | Kg/m | mp |
| 1/2 | 21.3 | 2.77 | 1.27 | 17.20 |
| 3/4 | 26.8 | 2.87 | 1.68 | 17.20 |
| 1 | 33.5 | 3.38 | 2.50 | 17.20 |
| 1-1/4 | 42.2 | 3.56 | 3.38 | 17.20 |
| 1-1/2 | 48.3 | 3.68 | 4.05 | 17.20 |
| 2 | 60.3 | 3.91 | 5.43 | 16.08 |
| 1-1/2 | 73 | 5.16 | 8.62 | 17.20 |
| 3 | 88.9 | 5.49 | 11.28 | 15.30 |
| 3-1/2 | 101.6 | 5.74 | 13.56 | 14.88 |
| 4 | 114.3 | 6.02 | 16.06 | 13.06 |
| 5 | 141.3 | 6.55 | 21.76 | 11.50 |
| 6 | 168.3 | 7.11 | 28.34 | 10.48 |
| 8 | 219.1 | 8.18 | 36.90 | 7.96 |
ASTM A795 (BLACK & GALVANISED)
| N.D. | O.D. | SCH 10 | SCH 30/40 | ||||||||
| WALLTHICKNESS | NOMINAL WEIGHT | WALLTHICKNESS | NOMINAL WEIGHT | ||||||||
| mm | inch | mm | inch | mm | inch | Kg/mtrs | Lbs/ft | mm | inch | Kg/mtrs | Lbs/ft |
| 15 | 1/2 | 21.30 | 0.84 | – | – | – | – | 2.77 | 0.109 | 1.27 | 0.85 |
| 20 | 3/4 | 26.70 | 1.05 | 2.11 | 0.083 | 1.28 | 0.96 | 2.87 | 0.113 | 1.69 | 1.13 |
| 25 | 1 | 33.40 | 1.32 | 2.77 | 0.109 | 2.09 | 1.41 | 3.38 | 0.133 | 2.50 | 1.68 |
| 32 | 1-1/4 | 42.20 | 1.66 | 2.77 | 0.109 | 2.69 | 1.81 | 3.56 | 0.14 | 3.39 | 2.27 |
| 40 | 1-1/2 | 48.30 | 1.90 | 2.77 | 0.109 | 3.11 | 2.09 | 3.68 | 0.145 | 4.05 | 2.72 |
| 50 | 2 | 60.30 | 2.38 | 2.77 | 0.109 | 3.93 | 2.64 | 3.91 | 0.154 | 5.45 | 3.66 |
| 65 | 2-1/2 | 73.00 | 2.88 | 3.05 | 0.12 | 5.26 | 3.53 | 5.16 | 0.203 | 8.64 | 5.80 |
| 80 | 3 | 88.90 | 3.50 | 3.05 | 0.12 | 6.46 | 4.34 | 5.49 | 0.216 | 11.29 | 7.58 |
| 90 | 3-1/2 | 101.60 | 4.00 | 3.05 | 0.12 | 7.41 | 4.98 | 5.74 | 0.226 | 13.58 | 9.12 |
| 100 | 4 | 114.30 | 4.50 | 3.05 | 0.12 | 8.37 | 5.62 | 6.02 | 0.237 | 16.09 | 10.80 |
| 125 | 5 | 141.30 | 5.56 | 3.4 | 0.134 | 11.58 | 7.78 | 6.55 | 0.258 | 21.79 | 14.63 |
| 150 | 6 | 168.30 | 6.63 | 3.4 | 0.134 | 13.85 | 9.30 | 7.11 | 0.28 | 28.29 | 18.99 |
| 200 | 8 | 219.10 | 8.63 | 4.78 | 0.188 | 25.26 | 16.96 | 7.04 | 0.277 | 36.82 | 24.72 |
| 250 | 10 | 273.10 | 10.75 | 4.78 | 0.188 | 31.62 | 21.23 | 7.08 | 0.307 | 51.05 | 34.27 |
Chemical Composition Requirements on Standard Fire Sprinkler Pipe
| Chemical Requirements of ASTM A795 | ||||
| SI | C | Mn | P | S |
| Type E (electric-resistance-welded pipe) & Type S (seamless pipe) | ||||
| Open-health electric-furnace or basic-oxygen | ||||
| Grade A | 0.25 | 0.95 | 0.035 | 0.035 |
| Grade B | 0.3 | 1.2 | 0.035 | 0.035 |
| Chemical Requirements of ASTM A53/A53M | |||||||
| Type E (electric-resistance-welded pipe) Composition, max % | |||||||
| Grade A | C | Mn | P | S | Copper | Nickel | Chromium |
| 0.25 | 0.95 | 0.05 | 0.045 | 0.4 | 0.4 | 0.4 | |
| Grade B | 0.3 | 1.2 | 0.05 | 0.048 | 0.4 | 0.4 | 0.4 |
application
- It is suitable for industrial piping systems that require rigid connections and prohibit pipeline displacement, such as fire water pipes, air conditioning cold water/hot water pipelines, industrial process pipelines, etc.
- Widely used in scenarios requiring ANSI/UL 213 UL/FM certification (such as fire protection systems), meeting strict safety standards.
- Suitable for connecting grooved end pipes of ductile iron, carbon steel, stainless steel, etc., with a pipe diameter range of 1″-24″ (DN25-DN600).
- Ideal choice: near fixed brackets, at pipe turns, and other critical nodes where pipe expansion/vibration needs to be completely limited.
advantages
- No displacement structure: The pipeline has zero axial and radial reaction force after being mechanically locked to the groove, and it will not move under all conditions of work to ensure the system rigidity.
- Easy assembly: Welding or flange connections are no longer necessary for the connection, only tightening of bolts is needed, with installation time saved more than 50%.
- Seismic & impact resistant: Ductile iron body (ASTM A536) with carbon steel bolts ensures structural strength to withstand water hammer and other external loads.
- Gaskets: EPDM/NBR rubber gaskets can be used for water/oil/gas and seal reliably there is no leakage between 300–500 psi.
- Practical for maintenance: Classic designed latches are helpful to dismantle, which is convenient to do a localized repair without damaging the original pipeline structure.
- Corrosion resistant and durable, with hot-dip galvanized or red paint surface requires no maintenance up to 30 years.
packing
- Standard Export Packaging:
- Individual cardboard box/plastic bag protection, including material certificate and installation guide.
- External labeling on carton includes dimensions, pressure rating, and moisture-proof 标识 (e.g., Rigid Coupling, 6″, 500 psi).
- Custom wooden box with anti-vibration padding for protection of components DN300 (12″) and above to avoid transportation impact.
- Bulk transportation: palletized stacking (no more than 1,500 kg per pallet), wrapped with stretch film, conforming to international freight standards.
ASTM A135 (BLACK & GALVANISED) SCH10
| N.D. | O.D. | WALLTHICKNESS | Tolerance+/- | TEST PRESSURE |
| Inch | mm | mm | Kg/m | mp |
| 3/4 | 26.8 | 2.11 | 1.28 | 17.24 |
| 1 | 33.5 | 2.77 | 2.09 | 17.24 |
| 1-1/4 | 42.2 | 2.77 | 2.7 | 16.55 |
| 1-1/2 | 48.3 | 2.77 | 3.1 | 14.48 |
| 2 | 60.3 | 2.77 | 3.93 | 11.72 |
| 2-1/2 | 73 | 3.05 | 5.26 | 10.34 |
| 3 | 88.9 | 3.05 | 6.45 | 8.27 |
| 3-1/2 | 101.6 | 3.05 | 7.41 | 6.89 |
| 4 | 114.3 | 3.05 | 8.36 | 6.21 |
| 5 | 141.3 | 3.40 | 11.58 | 5.86 |
| 6 | 168.3 | 3.40 | 13.84 | 5.02 |
| 8 | 219 | 4.80 | 15.41 | 4.26 |
ASTM A135 (BLACK & GALVANISED) SCH40
| N.D. | O.D. | WALLTHICKNESS | Tolerance+/- | TEST PRESSURE |
| Inch | mm | mm | Kg/m | mp |
| 1/2 | 21.3 | 2.77 | 1.27 | 17.20 |
| 3/4 | 26.8 | 2.87 | 1.68 | 17.20 |
| 1 | 33.5 | 3.38 | 2.50 | 17.20 |
| 1-1/4 | 42.2 | 3.56 | 3.38 | 17.20 |
| 1-1/2 | 48.3 | 3.68 | 4.05 | 17.20 |
| 2 | 60.3 | 3.91 | 5.43 | 16.08 |
| 1-1/2 | 73 | 5.16 | 8.62 | 17.20 |
| 3 | 88.9 | 5.49 | 11.28 | 15.30 |
| 3-1/2 | 101.6 | 5.74 | 13.56 | 14.88 |
| 4 | 114.3 | 6.02 | 16.06 | 13.06 |
| 5 | 141.3 | 6.55 | 21.76 | 11.50 |
| 6 | 168.3 | 7.11 | 28.34 | 10.48 |
| 8 | 219.1 | 8.18 | 36.90 | 7.96 |
ASTM A795 (BLACK & GALVANISED)
| N.D. | O.D. | SCH 10 | SCH 30/40 | ||||||||
| WALLTHICKNESS | NOMINAL WEIGHT | WALLTHICKNESS | NOMINAL WEIGHT | ||||||||
| mm | inch | mm | inch | mm | inch | Kg/mtrs | Lbs/ft | mm | inch | Kg/mtrs | Lbs/ft |
| 15 | 1/2 | 21.30 | 0.84 | – | – | – | – | 2.77 | 0.109 | 1.27 | 0.85 |
| 20 | 3/4 | 26.70 | 1.05 | 2.11 | 0.083 | 1.28 | 0.96 | 2.87 | 0.113 | 1.69 | 1.13 |
| 25 | 1 | 33.40 | 1.32 | 2.77 | 0.109 | 2.09 | 1.41 | 3.38 | 0.133 | 2.50 | 1.68 |
| 32 | 1-1/4 | 42.20 | 1.66 | 2.77 | 0.109 | 2.69 | 1.81 | 3.56 | 0.14 | 3.39 | 2.27 |
| 40 | 1-1/2 | 48.30 | 1.90 | 2.77 | 0.109 | 3.11 | 2.09 | 3.68 | 0.145 | 4.05 | 2.72 |
| 50 | 2 | 60.30 | 2.38 | 2.77 | 0.109 | 3.93 | 2.64 | 3.91 | 0.154 | 5.45 | 3.66 |
| 65 | 2-1/2 | 73.00 | 2.88 | 3.05 | 0.12 | 5.26 | 3.53 | 5.16 | 0.203 | 8.64 | 5.80 |
| 80 | 3 | 88.90 | 3.50 | 3.05 | 0.12 | 6.46 | 4.34 | 5.49 | 0.216 | 11.29 | 7.58 |
| 90 | 3-1/2 | 101.60 | 4.00 | 3.05 | 0.12 | 7.41 | 4.98 | 5.74 | 0.226 | 13.58 | 9.12 |
| 100 | 4 | 114.30 | 4.50 | 3.05 | 0.12 | 8.37 | 5.62 | 6.02 | 0.237 | 16.09 | 10.80 |
| 125 | 5 | 141.30 | 5.56 | 3.4 | 0.134 | 11.58 | 7.78 | 6.55 | 0.258 | 21.79 | 14.63 |
| 150 | 6 | 168.30 | 6.63 | 3.4 | 0.134 | 13.85 | 9.30 | 7.11 | 0.28 | 28.29 | 18.99 |
| 200 | 8 | 219.10 | 8.63 | 4.78 | 0.188 | 25.26 | 16.96 | 7.04 | 0.277 | 36.82 | 24.72 |
| 250 | 10 | 273.10 | 10.75 | 4.78 | 0.188 | 31.62 | 21.23 | 7.08 | 0.307 | 51.05 | 34.27 |
Chemical Composition Requirements on Standard Fire Sprinkler Pipe
| Chemical Requirements of ASTM A795 | ||||
| SI | C | Mn | P | S |
| Type E (electric-resistance-welded pipe) & Type S (seamless pipe) | ||||
| Open-health electric-furnace or basic-oxygen | ||||
| Grade A | 0.25 | 0.95 | 0.035 | 0.035 |
| Grade B | 0.3 | 1.2 | 0.035 | 0.035 |
| Chemical Requirements of ASTM A53/A53M | |||||||
| Type E (electric-resistance-welded pipe) Composition, max % | |||||||
| Grade A | C | Mn | P | S | Copper | Nickel | Chromium |
| 0.25 | 0.95 | 0.05 | 0.045 | 0.4 | 0.4 | 0.4 | |
| Grade B | 0.3 | 1.2 | 0.05 | 0.048 | 0.4 | 0.4 | 0.4 |
SPRINKLER STEEL PIPE is the backbone of fire protection systems:
Commercial Buildings: Offices, retail malls, hotels, hospitals, and schools requiring NFPA 13 compliant wet and dry systems.
Industrial Facilities: Manufacturing plants, warehouses, power stations, and chemical plants needing robust protection for high-hazard areas.
Residential Complexes: High-rise apartments and multi-family dwellings utilizing residential sprinkler standards (NFPA 13R/D).
Special Hazard Systems: Deluge and pre-action systems for data centers, museums, and facilities housing valuable assets. Infrastructure: Tunnels, airports, and transportation hubs where reliable fire suppression is critical.
Engineered for Life Safety: Designed and tested to meet rigorous fire protection standards, ensuring dependable performance when it matters most.
Outstanding Corrosion Resistance: Hot-dip galvanized for lasting protection in wet pipe systems and high-humidity environments.
Reliable Under Pressure: Uniform wall thickness and consistent material quality deliver stable performance at required system pressures.
Built to Last: Steel construction offers superior strength and resilience against impact, outperforming many alternative materials.
Proven Track Record: Trusted in fire protection systems around the world, with decades of safe and effective use.
Highly Adaptable: Compatible with all major sprinkler system types—wet, dry, pre-action, and deluge—and connection methods including threaded, grooved, and welded joints.
SPRINKLER STEEL PIPE is a high-quality welded or seamless steel tube specifically designed for fire sprinkler systems. Manufactured to exacting standards, it provides reliable performance under pressure and is essential for life safety applications. The pipe undergoes stringent quality control and is typically hot-dip galvanized for superior corrosion resistance, ensuring long service life in demanding environments. Key applications include wet, dry, pre-action, and deluge sprinkler systems in commercial buildings, industrial facilities, warehouses, and residential complexes. Compared to standard plumbing pipe, sprinkler pipe offers enhanced wall thickness consistency, controlled chemical composition for weldability, and guaranteed pressure ratings.
