B80Hx136/1P-NC-S 4x1 1/4"

B80Hx136/1P-NC-S 4x1 1/4" designates a SWEP B80 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. The /1P-NC fields read as single pass, with AISI 304 stainless steel plates and a copper braze. The closing S is the pressure class: 31 bar at 155 C. The connection field reads 4x1 1/4". The B80 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 24.9 kg (54.9 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. Depth is the one dimension that changes accross the plate counts of a series, so measure the space behind the unit before moving to a larger pack.