How do we calculate?
Allowable pressures are taken from the flange pressure–temperature tables on our website: EN 1092-1 material group 3E0 (P245GH / P250GH, C22.8; for PN 10–25 the smaller of the two thickness ranges is used; PN 40 and PN 63 values from the EN 1092-1:2013 Annex G tables, for flange thickness up to 50 mm) and ASME B16.5 Group 1.1 (A105, A216 WCB). Linear interpolation is used at intermediate temperatures. The flange type, gasket, stud and valve recommendations are the common ground of the installation recommendations published by heat transfer oil manufacturers: welded steel pipe, weld neck flanges, at least Class 300, spiral wound gaskets, alloy steel studs and steel-bodied bellows-sealed globe valves.
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