Materials & Standards
How to read the markings on a pipe fitting
Heat number, grade, size, schedule and standard: what each marking on a fitting means and how to check it against the certificate before you accept it.
Category
Materials & Standards
Material grades, ASME and ASTM standards, schedules and certificates explained for engineers and buyers.
Materials & Standards
Carbon, stainless and alloy steel fittings: choosing the right grade
A234 WPB, A403 WP316L, A420 WPL6 and A234 WP11 or WP22: what each grade is for, and how to choose between them for temperature, corrosion and cost.
Materials & Standards
Pipe schedules explained and how to match fitting wall thickness
NPS, schedule, STD, XS and XXS decoded. Learn how ASME B36.10M and B36.19M set wall thickness and how to match fittings to pipe without a mismatch.
Materials & Standards
What an EN 10204 3.1 mill test certificate tells you
A 3.1 certificate links your fittings to a heat of steel. See what it contains, how it differs from 2.2 and 3.2, and how to check one before accepting material.