Packing helps valves to meet latest regulations
A
James Walker and Co product story
Edited by the Engineeringtalk editorial team
Nov 7, 2005
French-manufactured Dresser Masoneilan control valves are now fitted with James Walker's Supagraf Control gland packing to meet VOC emission control levels when tested to the ISO15848 protocol.
French-manufactured Dresser Masoneilan control valves are now fitted with James Walker's Supagraf Control gland packing to meet the most stringent VOC emission control levels when tested to the ISO15848 protocol.
This follows close collaboration between Masoneilan and James Walker to meet the tough requirements in tests carried out by CETIM at Nantes, France.
ISO15848 specifies testing procedures for the evaluation of external leakage of valve stem seals (or shaft) and body joints of isolating valves and control valves intended for use in volatile air pollutants and hazardous fluids.
The Masoneilan control valves have been certified to ISO15848 Class B, CC2, at temperatures of -29 to +425C.
To gain Class B, CC2 the valves had to show helium leakage rates less than 0.0001mg/s/m for 60,000 stem cycles.
This was achieved with 57.5bar pressure at 425C and 103.4bar at -29 to +38C.
Stephane Leledy of Masoneilan explained: "Using Supagraf Control, we can supply control valves that meet the new standards and European directives on VOC emissions".
"Our aim is to help industry reduce greenhouse gas emissions in line with the Kyoto protocol".
Supagraf Control was specifically developed by James Walker to cut fugitive emissions from control valves to well below 50ppm.
Made of high purity exfoliated graphite ribbon, reinforced in a novel way, it seals super efficiently with very low friction for over 100,000 stem strokes.
"We view Supagraf Control as the 'best available technology' product to seal the stems of control valves and reduce industry's fugitive emissions in line with the European Union's IPPC Directive", stated Andrew Goulding, James Walker's top expert on compression packings.
"A valve is now being tested to ISO15848 Class B, CC3, which will officially confirm its stem sealing efficiency to 100,000 operating cycles".
Supagraf Control is supplied as precision moulded rings or sets in sizes to suit all standard control valves.
It also comes in 8m lengths.
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Tel +44 1270 536000
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