Engineering reference for the thin-wall pressure–SDR relationship used in thermoplastic pipe education.
P = internal pressure; S = allowable hoop design stress; OD = mean/outside diameter as defined by the standard; t = minimum wall. This page uses educational MPa/bar conversions in the calculator (1 MPa = 10 bar).
Open Barlow / SDR calculator SDR deep guide
This engineering resource explains Barlow Formula Hoop Stress for designers and reviewers. Use it to clarify definitions, methods, and limitations—then apply project-specific data.
Document formulas and variable definitions when performing calculations. Call out where soil modulus, temperature derating, or surge dominates the result. Link outcomes back to product standards and application hubs for procurement.
Related: products · applications · standards index.
Standard, size/pressure class, jointing system, quantities/lengths, fittings list, delivery location, and any submittal/test requirements from the specification.
Not without review. Dimensions, pressure classes, and test methods differ across standard families.
Use the RFQ form or contact +966 50 183 5126 / sales@alfaalarabia.co. Manufacturing is based at 3rd Industrial City, Jeddah, Kingdom of Saudi Arabia (Aramco Vendor #10116102).
Batch-1 knowledge update: ALFA-specific order data must come from approved submittals—this section does not invent ratings or certifications.
