B85Hx120/1P-SC-M 4x1 1/4"&28U(27)

B85Hx120/1P-SC-M 4x1 1/4"&28U(27) designates a SWEP B85 brazed plate heat exchanger with 120 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 M is the pressure class: up to 45 bar at 135 C, fatigue tested. Connections are listed as 4x1 1/4"&28U(27), in port order. The B85 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 120-plate unit comes to about 18.5 kg (40.8 lb) dry. The frame is published to 17 m3/h (74.85 GPM) - a port limit rather than a design flow. If the flow on either side would exceed the published ceiling, the answer is a larger frame, not more plates on this one.