Flanged NACE Regulator For Sour Gas Analysis

The LF311 is a single-stage regulator with a solid disk seat design to allow various seating options, such as PCTFE and PEEK™, for aggressive and high temperature applications.

This specially adapted ANSI-flanged pressure regulator has been developed for use on Sour Gas installations for Saudi Aramco. By removing the need for high pressure NPT instrumentation lines, and connecting directly to the process line, it crucially eliminates the potential for leak paths. The flanged LF311, also includes a large piston-sensed element for use with Hydrogen; it protects against the risk of Hydrogen embrittlement and provides excellent pressure control to the gas analyser system.


• 300bar (4,350psig) supply pressure*
• 35bar (500psig) max outlet range
• NACE material MR0175
• All 316SS machined wetted parts and spring enclosure • Non-venting
• Unbalanced main valve
• Port size: 1/4˝ NPT
• Optional anti-tamper cover
• 40 micron inlet filter
• ATEX/IECEx heated pressure regulator version also available
*Determined by flange rating


• Potential leak paths eliminated due to the flanged inlet connection straight to the process line
• Unauthorised adjustment is prevented by the optional tamper-proof cover
• Large sensitive piston element provides accurate and repeatable control whilst being exceptionally strong and safe on Hydrogen/H2S mix


H2 Recycle Gas Compressor - specifically required an inlet pressure of 160-225bar (2300-3300psig) with an outlet pressure of 4bar (60psig). Sampling a gas composed of Hydrogen 92%, H2S 2.5% and natural gas, the regulator was designed to NACE MR0175 with inlet connections of 1/2˝ ANSI 1500# RF and outlet 1/4˝ NPT.

Tel: +44 (0) 1457 899 307
Email: info@pressure-tech.com
Web: www.pressure-tech.com

Published in Valve User Magazine Issue 42

Summer 2019 // Issue 49
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