William Johnston & Company Limited want to assist you in making water utility flange connections leak free. We are passionate about reducing leakage and ongoing remedial maintenance costs. We are obviously not the only ones. Water Authorities, Contactors and sub-contractors all want the same. How do we achieve this?
The Holistic Approach
We require a holistic approach. We can give you the best gaskets and bolts that are suitable for the application and pertinent to the British and harmonised European standards that govern the essential parts of a flanged connection, but unless these are installed accurately every time, we still have leakage.
Or we can ensure that installation is in line with Best Available Techniques and digitise the installation process to ensure ongoing installation accuracy but without the correct gaskets and bolts we again face leakage.
Highly Approved
Our WRAS approved, BS EN 681, W270 tapered Steel Rubber Gasket has been EN13555 tested pertinent to detail from EN1591 as referenced in BS EN 1092. A full suite of target torque values has then been reverse calculated using a lubrication factor of 0.12 and optimum gasket stress of 15MPa. This is achieved by appropriate lubrication of the load bearing surfaces of the fastener assembly using WRAS approved Interflon HT1200 bolt assembly lubricant.
This is the only SRG that will work in harmony with Ductile Iron flanges. BS EN 1092-2 and EN 545 constrain our bolt grade to a maximum of 4.6. BS EN 12201 PE flanges refers to ISO 9624 for details and dimensions pertinent to backing rings. Detail within ISO 9624 details “the selection of gasket type is important and will influence the performance of the joint. Drop-in steel core gaskets with or without integrated O ring have been shown to have better performance than other gasket types”. Tested to 40Bar at ambient temperature these tapered SRG will pressure test at 24Bar and offer long service life at 16Bar covering all connection types for PN16 flanges. But keep in mind they must be properly installed.
EUSR Approved Digitised Flange Assembly
EUSR approved digitised installation allows us to not only control the process but to record the individual detail that each flange assembly requires. In conjunction with ControlPoint we offer the most advanced digitised flange assembly installation available. Tailored for UK Water Utilities it raises the confidence level between design and installation. Already tried and approved on multiple large diameter schemes within the UK over the past few years and now approved by several water authorities, is it time that you reconsidered your choice of gaskets and bolts? www.steelrubbergaskets.co.uk
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