Sample vessels are Pi marked
A
Vacuum Fabrications product story
Edited by the Engineeringtalk editorial team
Jan 12, 2007
Vacuum Fabrications has worked for over five years attaining certification for the design and construction of Pi marked vessels.
It has been a mandatory requirement throughout the EEC, since 30th June 2003, under the Transportable Pressure Equipment Directive, for all newly commissioned mobile gas sample vessels to be Pi marked.
Vessels that form part of a fixed installation require CE marking (slightly less stringent construction and testing requirements) but any vessel that is transported in any way must be Pi marked.
In practice, this means that most sample vessels are required to be Pi marked.
Vacuum Fabrications has worked for over five years attaining certification for the design and construction of Pi marked vessels, specifically for use as transportable sample cylinders for use in environmental studies.
Vessels up to 30 litre capacity are now fully accredited and have been cleanliness tested by the Department of Environmental Sciences of the University of East Anglia, for whom they have been developed.
Construction is carried out in-house, where the company's ultra-high-vacuum and ultra-high-purity fabrication facility produces vessels conforming to BS EN13322-2 (Transportable gas cylinders - Refillable welded steel gas cylinders - Design and construction, Part 2: Stainless steel).
All welders are qualified to BSEN287-1 and use procedures that meet ISO15614-1 and ASME IX.
All welds meet the requirements of EN25817 level C (Stringent) before they are leak tested to better than 1 x 10e-9 torr litre/s on a helium mass spectrometer.
Vessels range from 0.05 to 30 litre, with pressure ratings from 43bar down to 0.5bar (CE and Pi regulations centre around bar x litre multiples).
Customers rely heavily on Vacuum Fabrications? design and certification expertise, and the company is ready to commission new designs as they are requested.
New designs will require full approval by the Nominated Body, Lloyds Register and this process involves extensive testing, both destructive and nondestructive in order to prove the design.
Vacuum Fabrications also has over 10 years? experience in the construction of containers (bubblers) for the transport of hazardous and sometimes pyrophoric chemicals for the semiconductor industry and these are now designed and fabricated by the same team as the Pi marked vessels.
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