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News, products, standards, installation guides and events from TUPY and its Middle East agent.

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DN, NB or Inches: Sizing Pipe Fittings Without the Ordering Mistakes Selection and Buying Guide

DN, NB or Inches: Sizing Pipe Fittings Without the Ordering Mistakes

A drawing says DN 25, the BOQ says 1 inch, and a caliper reads 33 mm. Only one of those is a measurement. How nominal sizing works, how to get from a caliper reading back to a size, and how to write a reducing fitting so it arrives the right way round.

8 September 2026
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What Is Malleable Cast Iron and Why Are Pipe Fittings Made from It? Selection and Buying Guide

What Is Malleable Cast Iron and Why Are Pipe Fittings Made from It?

Malleable cast iron is not the same thing as ordinary cast iron. A long heat treatment turns a brittle material into one that deforms under impact instead of breaking — and that difference is what made it the standard material for pipe fittings.

16 August 2026
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The Difference Between BSP and NPT Threads in Pipe Fittings: A Guide to Telling Them Apart Selection and Buying Guide

The Difference Between BSP and NPT Threads in Pipe Fittings: A Guide to Telling Them Apart

BSP and NPT threads look very similar but are not compatible. This article explains the difference in flank angle, crest form and reference standards with a diagram, and shows how to tell them apart on site.

16 August 2026
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What Are Brazilian Fittings? A Complete Introduction to TUPY Fittings Selection and Buying Guide

What Are Brazilian Fittings? A Complete Introduction to TUPY Fittings

In the regional trade, “Brazilian fittings” effectively refers to one brand: TUPY. But why did the fittings of a Brazilian foundry become the market benchmark, and how do you tell a genuine fitting from a counterfeit?

16 August 2026
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A Guide to Choosing Pipe Fittings: Malleable Cast Iron, Galvanised or Black? Selection and Buying Guide

A Guide to Choosing Pipe Fittings: Malleable Cast Iron, Galvanised or Black?

Choosing pipe fittings is not just choosing a size. The material, the coating and the accuracy of the thread decide whether your piping system runs for ten years without a leak or causes trouble in its first year.

16 August 2026
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Why the Choice of Fitting Material Determines the Life of a Piping System Selection and Buying Guide

Why the Choice of Fitting Material Determines the Life of a Piping System

Fittings are the point at which piping systems actually run into trouble. This article looks at why malleable cast iron behaves differently from brittle materials under impact, vibration and pressure, what part thread accuracy plays in preventing leaks, and what to check when buying a fitting.

8 August 2026
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