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GuideDiode Trading EST · 4 min read
30 October, 2026 | 
Admin
Short answer: To order pipes, fittings and flanges correctly, specify the material, nominal size, wall thickness or schedule, pressure class, the governing standard and the quantity. Ask for the Material Test Certificate with every order. Missing any one of these can mean the wrong part arrives, which costs more than the part itself.
Pipes, fittings and flanges are standard items, but small differences matter: a flange of the right size but the wrong pressure class will not mate, and a pipe of the right diameter but the wrong wall thickness will not carry the required pressure. A clear specification avoids most mistakes.
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Parts must match across all these points. A flange, gasket, bolting and the mating flange all need the same size, class and facing. Pipe and weld-neck flanges must match wall thickness at the weld end. If you are repairing an existing line, check the markings on the old parts and the line list or drawing.
The pressure class of a flange or the schedule of a pipe tells you how much pressure and temperature it can handle. Higher class or heavier wall means higher capacity, but also more weight and cost. The engineer sets the required class from the process conditions; do not change it without approval.
Carbon steel is common for general service. Stainless steel resists corrosion and is used for chemical, food and water treatment applications. Other alloys and plastics suit specific fluids and conditions. Choose according to the fluid, temperature, pressure and corrosion risk, and follow your specification.
A flange joint also needs a gasket and bolts. The gasket material depends on the fluid and temperature. See gasket selection guide, ready-cut gaskets, graphite gaskets and PTFE gaskets. Ask for the bolting that suits your flange class.
Material test certificates link a batch of material to its test results and are often required on industrial projects. Diode Trading EST ships every order with a Material Test Certificate. If your site needs additional documents, tell us when you enquire.
A list or sketch with the item, material, size, schedule or wall, pressure class, standard, facing, quantity and delivery location. If you are matching existing parts, send photos and markings.
Diode Trading EST stocks pipes, pipe fittings and flanges at its Dammam warehouse for dispatch across Saudi Arabia. Tell us the material, size, pressure class and quantity and we will confirm availability and send a quotation. Request a quote.
Type, size, pressure class, facing, material and standard.
Every order ships with a Material Test Certificate.
Yes, tell us the flange details and fluid.
Send photos and markings and we will help identify it.
Related guides: Gasket Selection Guide · Ready-Cut Gaskets · PTFE Gasket Types
Explore the product range: Mechanical Industrial Solutions · Ready-Cut Gaskets · Non-Asbestos Gasket Sheet
Need a price or lead time? Request a quote with sizes, quantity and delivery city in Saudi Arabia.
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Read moreDiode Trading EST supplies these Rubber Sheets, Gaskets & Seals from stock in Dammam, with delivery across Saudi Arabia and the GCC.
Stock in Dammam · MTC with every order
Need a price or lead time? Talk to our sales team.
