B18Lx60/1P-SC-U 4xS28.58&W35.1

B18Lx60/1P-SC-U 4xS28.58&W35.1 designates a SWEP B18 brazed plate heat exchanger with 60 plates in the pack. The L plate is the acute chevron, which gives up some heat transfer per plate for a lower pressure drop - the usual answer when the available head is small. Reading the string: /1P is single pass; -SC is 316/316L stainless steel plates joined with copper. The closing U is the pressure class: 64 to 140 bar. The connection field reads 4xS28.58&W35.1. 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 60-plate unit comes to about 19.1 kg (42.0 lb) dry. Maximum flow for the frame is 9 m3/h (39.63 GPM); that is a ceiling for the ports, not a duty point. Treat each side as an independent circuit when you ask for a quote: give both flows and what each fluid is.