ERW steel pipes from ½″ to 12″, schedule 10 through 40, in black, primer-coated, painted or hot-dip galvanized finishes — manufactured under ASTM A53 and EN 10255 with full mill certification.
Manufactured to spec.
Every pipe leaves the mill against an internationally recognized standard with mill certificates traceable to the source heat number.
ASTM A53 Grade A & B
Welded and seamless steel pipe for mechanical and pressure applications. The reference standard for firefighting, plumbing and structural piping in North American practice.
EN 10255 Type L & L1
European standard for non-alloy steel tubes suitable for welding and threading. Specified for water, gas and low-pressure service.
UL 852
Metallic sprinkler pipe listed by UL for use in automatic sprinkler systems. Independently evaluated for life-safety compliance.
BS 1387
British standard for carbon steel tubes suitable for welding, threading and plain-end use across utility and process piping.
ASTM A53 vs EN 10255.
Both standards are accepted across the region. The right choice depends on consultant preference, end-use, and the threading or welding the system requires.
| Criterion | ASTM A53 (Gr. A & B) | EN 10255 (Type L & L1) |
|---|---|---|
| Origin | American Society for Testing & Materials | European Norm — non-alloy steel tubes |
| Primary use | Firefighting, mechanical, pressure piping | Water, gas, low-pressure utility piping |
| Welding | Suitable for welded fabrication and butt-welds | Suitable for welding and threading per spec |
| Threading | NPT (taper) per ASME B1.20.1 | BSPT / ISO 7-1 (taper) |
| Size range | NPS ½″— 26″ (we supply ½″ — 12″ locally) | DN 6 — DN 150 (we supply DN 8 — DN 150) |
| Typical projects | NFPA sprinkler, US-spec consultants, Gulf life-safety | Municipal water, EU-spec consultants, plumbing risers |
| Mill certificate | EN 10204 3.1 — heat-number traceable | EN 10204 3.1 — heat-number traceable |
The dimensions that matter.
Buyers and specifiers care about a small set of measurements. Each one is verified per pipe length against the mill certificate.
Outside diameter (OD)
The nominal outer measurement that drives fitting selection. Verified against the standard's tolerance band on every length.
Wall thickness
Determines pressure rating and schedule (Sch 10, 40, etc.). Checked at multiple points along each pipe.
Weld line
The longitudinal seam from electric resistance welding. Inspected by eddy current and ultrasonic — flash trimmed flush inside and out.
Straightness & length
Pipes leave the line straightened and cut to length. Bow tolerance is verified before bundling.
½″ to 12″, scheduled.
Schedule 40 reference dimensions per ASTM A53. Other schedules and wall thicknesses available on request — talk to our technical sales.
| Nominal size | OD (mm) | Wall (mm) | Mass (kg/m) |
|---|---|---|---|
| ½" | 21.3 | 2.77 | 1.27 |
| ¾" | 26.7 | 2.87 | 1.69 |
| 1" | 33.4 | 3.38 | 2.50 |
| 1¼" | 42.2 | 3.56 | 3.39 |
| 1½" | 48.3 | 3.68 | 4.05 |
| 2" | 60.3 | 3.91 | 5.44 |
| 2½" | 73.0 | 5.16 | 8.63 |
| 3" | 88.9 | 5.49 | 11.29 |
| 4" | 114.3 | 6.02 | 16.07 |
| 5" | 141.3 | 6.55 | 21.77 |
| 6" | 168.3 | 7.11 | 28.26 |
| 8" | 219.1 | 8.18 | 42.55 |
| 10" | 273.0 | 9.27 | 60.31 |
| 12" | 323.9 | 10.31 | 79.73 |
Surface, specified.
Each pipe leaves the mill with a finish chosen for its service environment — buried, exposed, fire-suppression or process.
Hot-dip galvanized
Zinc coating per ASTM A53 / BS EN 10240, recommended for buried water lines and exposed installations requiring corrosion resistance.
Black plain-end
Mill-finish carbon steel pipe, supplied with light protective varnish. Standard finish for fabrication and weld-out service.
Red painted
Factory-applied red oxide or topcoat for sprinkler and standpipe fire systems, meeting NFPA visual identification practice.
Primer coated
Project-specified primer for downstream painting or wrap, applied under controlled conditions for uniform film build.
Connections, made simple.
Plain, beveled, threaded (NPT or BSPT) or grooved ends supplied to project specification — with caps and identification banding on request.
Plain end
Square-cut, deburred ends for site welding, socket connection or coupling. Standard finish for fabrication.
Beveled end
30° + 7.5° bevel angle per ASME B16.25 for butt-welded service. Specified for high-pressure and process fabrication.
Threaded — NPT / BSPT
Taper threading per ASME B1.20.1 (NPT) or ISO 7-1 (BSPT), supplied with coupling and protective end cap.
Grooved end
Roll-grooved ends compatible with mechanical couplings (Victaulic-style) for sprinkler and HVAC systems.
Complete piping systems.
Through Gazelle Trade we supply the fittings, couplings and flanges that complete a piping package — sourced from approved vendors and shipped alongside the pipe.
Tees & crosses
Equal and reducing tees, crosses for branch connections.
Elbows
45° and 90° elbows in long and short radius.
Flanges
Slip-on, weld-neck and blind flanges to ANSI / EN.
Grooved couplings
Mechanical couplings for sprinkler and HVAC piping.
Valves
Gate, globe, butterfly and check valves to project spec.
Reducers
Concentric and eccentric reducers across the size range.
Send us your BOQ.
We'll come back the same business day with pricing, lead time and a mill submission package ready for consultant review.