Nominal Pipe Size
Refers to the size of the pipe by name rather than actual dimensions.
Product Standards
All Supreme Steel Pipe products are manufactured to internationally recognized standards — ASTM, PNS, and AWWA.
This reference covers applicable standards, chemical composition, mechanical properties, dimensional tolerances, and unit conversion formulas used across our product line.
Key Pipe Dimensions Explained
Outside Diameter
The actual measured diameter across the exterior of the pipe.
Inside Diameter
The diameter of the hollow part of the pipe, determining flow capacity.
Wall Thickness
The measurement between the ID and the OD, determining strength.
Applicable Standards
ASTM A-53
Standard specification for pipe, steel, black and hot-dipped, zinc-coated, welded and seamless.
Applicable to:
Supreme Steel Pipe
Superior Pipe
Tri-R Pipe
Strux
PNS 26 V.2018
Covers ERW black and galvanized iron pipes for general plumbing and structural use in the Philippine market.
Applicable to:
Supreme Steel Pipe
Superior Pipe
Tri-R Pipe
Supreme Red
PNS 2145 V.2020
Covers lightweight structural steel tubes such as fence and structural tubes. Not for water use.
Applicable to:
Strux
ASTM A252
Standard specification for welded and seamless steel pipe piles.
Applicable to:
Regan Industrial
SSAW/LSAW
ASTM A139
Standard specification for electric-fusion arc-welded steel pipe for use in high-pressure transmission systems.
Applicable to:
Regan Industrial
SSAW/LSAW
AWWA C200
Standard for steel water pipe, 6 inch and larger, for water transmission and distribution systems.
Applicable to:
Regan Industrial
SSAW/LSAW
Tolerances & Coating
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Zinc Coating Note
Average zinc-coating thickness of 76–85μ ensures corrosion resistance meeting PNS 26:2018 requirements for galvanized iron pipe.
Unit Conversion Guide
Unit Weight Calculation Method
API & ASTM Standards
W = 10.68 (D − t) × t
- W = Weight per unit length (lb/ft)
- t = Wall thickness of pipe (in.)
- D = Outside diameter of pipe (in.)
- Note: Result rounded to a three-figure number.
BS Standards
W = 10.68 (D − t) × t
- W = Weight per unit length (lb/ft)
- t = Wall thickness of pipe (in.)
- D = Outside diameter of pipe (in.)
Conversion of Units
| Standard | Formula | Note |
|---|---|---|
| API Standards | W (lb/ft) × 0.453592 = W (kg/ft) | 2 decimal places |
| BS Standards | W (lb/ft) × 0.453592 = W (kg/ft) | 3-figure number |
| ASTM Standards | S (lb/ft) × 0.45359237 = W (kg/ft) | 3-figure number |
| Length (ft → m) | L (ft) × 0.3048 = L (m) | — |
| Length (ft → mm) | 1(ft) × 25.4 = 1" (mm) | — |
