B18Hx50/1P-SC-U 4xS28.58&W35.1

B18Hx50/1P-SC-U 4xS28.58&W35.1 designates a SWEP B18 brazed plate heat exchanger with 50 plates in the pack. The H plate is the obtuse chevron: it gives the most heat transfer per plate and the most pressure drop, so it suits duties where approach temperature matters more than pump head. The /1P-SC fields read as single pass, with 316/316L stainless steel plates and a copper braze. The closing U is the pressure class: 64 to 140 bar. Connections are listed as 4xS28.58&W35.1, in port order. The B18 plate pack measures 377 x 119.5 mm (14.84 x 4.7 in) on 329 x 72 mm port centres, and by SWEP's published weight formula a 50-plate unit comes to about 16.6 kg (36.5 lb) dry. The frame is published to 9 m3/h (39.63 GPM) - a port limit rather than a design flow. Check the connection field seperately from the plate count: two units can be consistent in every other field and still not pipe up.