Wall Thickness and OD Measurement on Steel Pipe: Methods, Tolerances and Evidence
Calipers, pi tapes and UT gauges — how to measure OD and wall the way standards assume, plus a cross-standard tolerance quick reference.
PMI Testing for Carbon Steel Pipe: Stop Grade Substitution Before It Ships
What handheld XRF and OES can and cannot prove, how to build a sampling plan, and when PMI results should escalate to lab analysis.
ASTM A671 vs A672 EFW Pipe: Plate Grades, Class System and How to Order
What A671 and A672 Are — and Why LSAW Mills Care ASTM A671 and A672 cover electric-fusion-welded (EFW) pipe made from pressure-vessel-quality plate, with filler metal added (submerged-arc welding in practice — the LSAW process). The two specifications differ only in design temperature: A671 for atmospheric-temperature service (roughly −20 °F to +90 °F ambient duty)
Forged Steel Standards Family: A29/A336, EN 10222, DIN 17200/17221, GB/T 3077 and Grade Cross-Reference
The Standards Map for Forged Steel Products A forged round bar, block or disc rarely ships with just one standard on the certificate — it carries a family: a general-delivery standard for the forging itself, a steel-grade standard defining chemistry and mechanical properties, a heat-treatment convention, and an ultrasonic testing standard. Chinese mills quote them
Boiler Tube Standards Family: EN 10216-2 vs DIN 17175 vs GB/T 5310 vs ASME
One Family, Four Names Carbon and low-alloy boiler tubes travel under four standard families depending on where the plant was engineered: EN 10216-2 (Europe, seamless), DIN 17175 (the German classic that EN 10216-2 superseded — still specified on thousands of running plants), GB/T 5310 (China, seamless high-pressure boiler tube, current edition 2023) and the ASME
GB/T 3091 vs BS 1387 vs EN 10255: Low-Pressure Welded Pipe Standards Compared
Why Three Standards Describe “The Same Pipe” Ask for “1 inch galvanized pipe” in Lagos, Rotterdam or Shanghai and you will touch three different standards. BS 1387 is the classic British standard for steel tubes suitable for screwing with BS 21 (now ISO 7-1) threads — decades of Commonwealth-era infrastructure still specifies it. Its European
3PE, FBE and 3PP Coating Standards: DIN 30670/30678 vs ISO 21809 vs AWWA
The Standards Behind Each Coating System External anti-corrosion coatings are qualified by system-specific standards, and the region of your project usually decides which one governs. Knowing the map prevents the classic mistake of quoting “3PE” without naming the standard, wall surface preparation, or test regime. System Governing Standards Notes 3PE (3-layer polyethylene) DIN 30670 ·
Galvanizing Standards Compared: ISO 1461 vs ASTM A123 vs GB/T 13912 vs A653
Four Standards, Two Different Jobs Galvanizing standards split into two families that buyers constantly mix up: after-fabrication hot-dip galvanizing (the part is made, then dipped) and continuous/pre-galvanized product coating (the strip or tube is coated in-line before forming). Choosing the wrong reference in a spec is one of the most common zinc-related claims. Standard Family
EN 10216 vs EN 10217: Seamless and Welded Pressure Tubes, Parts and Test Categories
One Job, Two Execution Routes EN 10216 covers seamless steel tubes for pressure purposes; EN 10217 covers the same job in welded execution. Both are divided into parts by service temperature: –1 for ambient, –2 for elevated temperature (the boiler/power suffix), –4 for low temperature, –5 for stainless. When a European drawing says “P265GH tube
ASTM A252 Pipe Pile Guide: Grades 1/2/3, Execution and What to Specify
ASTM A252 in One Paragraph ASTM A252 is the standard for welded and seamless steel pipe piles — the driven or drilled foundation pipe used in wharves, bridges, buildings and offshore structures. It defines three strength grades and leaves almost everything else (coating, end condition, splicing) to the project specification, which is why reading A252