B28Hx136/1P-SC-S 4x1 1/4"(27)

B28Hx136/1P-SC-S 4x1 1/4"(27) designates a SWEP B28 brazed plate heat exchanger with 136 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. Reading the string: /1P is single pass; -SC is 316/316L stainless steel plates joined with copper. The closing S is the pressure class: 31 bar at 155 C. Connections are listed as 4x1 1/4"(27), in port order. The B28 plate pack measures 526 x 119 mm (20.71 x 4.69 in) on 470 x 63 mm port centres, and by SWEP's published weight formula a 136-plate unit comes to about 24.4 kg (53.7 lb) dry. Maximum flow for the frame is 16.9 m3/h (74.41 GPM); that is a ceiling for the ports, not a duty point. If any field on your nameplate differs from the string above, tell us which one; a single letter is relevent to both rating and fit.