We Know PVF a Blog by MRC Global
  • Norsok M-650
  • Double Block & Bleed
  • Fugitive Emissions Standards

Understanding Norsok M-650

By Ingve Stangeland, Technical Manager, MRC Global
May 18, 2017 Tags: NORSOK, NORSOK 650

If you are involved in sourcing products for offshore or subsea applications, you have probably been introduced to the Norsok M-650 qualification.

So, what is Norsok?

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Defining Double Block and Bleed

By Greg Peterson, Executive Director - Midstream/Upstream Valves & Automation, MRC Global
April 11, 2017 Tags: Valves, Double Block and Bleed, DBB, DIB, Double Isolation and Bleed

A common question we hear from many of MRC Global’s customers concerns the definition of a double block-and-bleed valve. There is confusion because there are many interpretations of the term double block-and-bleed (DBB) when describing valve functionality. It seems that almost every end user and manufacturer has a different idea of what the term means for valve selection, which can result in the wrong specifications or valve type.

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Navigating the EPA's Fugitive Emissions Standards

By Ralph Chaney, Senior Director - Downstream Valves & Automation, Supply Chain Management
March 14, 2017 Tags: Fugitive Emissions, API 622, API 624, API 641, API Testing, Valve Packing

As a leading valve distributor, API fugitive emission standards are something MRC Global addresses on a daily basis. Compliance with these standards and the associated EPA standards are a vital part of the valve selection and sourcing process.

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