Arshya Pipe Fittings

A Procurement Officer's Technical Checklist for ASME B16.9 Flange Tolerances Published 1 June 2026 · Arshya Pipe Fittings Pvt Ltd A quick technical note before the checklist: ASME B16.9 governs factory-made wrought buttwelding fittings and stub ends — elbows, tees, reducers, caps, laterals, crosses, and stub ends. The flange face that bolts onto a stub end is governed separately by ASME B16.5 (or B16.47 above 24" NB). Most procurement rejections on a mixed fitting-and-flange order trace back to this exact split — a stub end can pass B16.9 dimensional checks while the backing flange it pairs with fails a B16.5 facing check, or vice versa. This checklist covers what to verify on the B16.9 side; ask your supplier for matching B16.5 documentation separately when stub ends are ordered with backing flanges. Getting the dimensional tolerance check wrong at receiving doesn't just risk a rejected shipment — it risks a fit-up failure on site, months after the PO closed and the weldi...

ASTM A420 WPL6 carbon steel elbows, tees and reducers for low-temperature piping What Is ASTM A420 WPL6, and Why Does It Matter for Cold-Service Piping? When carbon steel is exposed to sufficiently low temperatures, its toughness can decrease significantly, increasing the risk of brittle fracture. This is particularly important in applications such as LNG, low-temperature hydrocarbon processing, and cryogenic storage systems. ASTM A420 WPL6 is a low-temperature carbon steel grade specifically intended for wrought butt-welding fittings used in pressure applications at low temperatures . Its key advantage is not simply its chemical composition. It is the combination of controlled material properties and low-temperature impact toughness requirements that makes WPL6 suitable for demanding sub-zero service. Why Charpy Impact Testing Matters For low-temperature piping, tensile strength alone does not tell the whole story. The critical question is: How does the material behave w...

Our last two posts covered EN 10253-2's Type A/Type B pressure logic and how the standard compares to ASME B16.9. This post looks at a question that comes up just as often once the standard and type are settled: which EN 10253-2 steel grade actually suits your operating temperature? EN 10253-2 covers a range of carbon and low-alloy steel grades, and they are not interchangeable once temperature enters the picture. Here's how they stack up, from lowest to highest temperature capability. P235GH and P265GH — The Baseline Carbon Steel Grades P235GH and P265GH are the standard's plain carbon steel grades, differing mainly in carbon and manganese content — P265GH carries slightly more of both, giving it higher yield and tensile strength at the cost of slightly reduced weldability compared to P235GH. Both are general-purpose pressure grades, well suited to moderate elevated-temperature service, and are typically the most economical choice where operating temperatures stay in...

“EN 10253-2 vs ASME B16.9: key differences in dimensions, materials, pressure rating, and application.”   EN 10253-2 vs ASME B16.9: Which Buttweld Fitting Standard Should You Specify? In our last post, we introduced EN 10253-2 Type B buttweld fittings and how they differ from Type A. If you supply or specify piping components internationally, though, an even more basic question usually comes first: EN 10253-2 or ASME B16.9? Both are respected, widely used standards for factory-made buttweld fittings — but they aren't interchangeable, and knowing where they diverge matters before you place an order. Two Standards, Two Regions of Origin ASME B16.9 is the American standard for factory-made wrought steel buttwelding fittings — elbows, tees, reducers, caps — and is the standard most commonly specified across North America and in projects following US engineering practice. EN 10253-2 is the corresponding European standard, covering buttwelding fittings in non-alloy and ferritic...