B12Lx30/1P-SC-S 4x1 1/4"&28U

B12Lx30/1P-SC-S 4x1 1/4"&28U designates a SWEP B12 brazed plate heat exchanger with 30 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. The /1P-SC fields read as single pass, with 316/316L stainless steel plates and a copper braze. The closing S is the pressure class: 31 bar at 155 C. It is catalogued with 4x1 1/4"&28U connections. The B12 plate pack measures 287 x 117 mm (11.3 x 4.61 in) on 234 x 63 mm port centres, and by SWEP's published weight formula a 30-plate unit comes to about 3.5 kg (7.7 lb) dry. The frame is published to 16.9 m3/h (74.41 GPM) - a port limit rather than a design flow. Depth is the one dimension that changes across the plate counts of a series, so measure the space behind the unit before moving to a larger pack.