SWEP B80S

One fine enough to stop anything larger than the published maximum particle size, which is 1 mm for the B80S. Particles bigger than that lodge at the channel inlets, block channels one by one and show up as a slowly rising pressure drop.

Because the unit cannot be opened, a blocked channel is cleared only by back-flushing or chemical cleaning, and sometimes not at all. Fit the strainer upstream on any open circuit, new pipework or system with scale or weld debris, and make it accessible for cleaning. On an ammonia or pure-water system, choose a strainer body and mesh in stainless so the strainer does not reintroduce the metals the exchanger was chosen to avoid.

The datasheet lists a maximum of 137 plates, and catalogued part numbers on file run from 20 up to 140, so the top of the range is confirmed with the quote. More plates give more parallel channels, which lowers pressure drop and tightens the approach.

The 74.85 GPM ceiling does not move with the count, because it is set by the ports. Weight rises by the published formula, 2.18 kg plus 0.231 kg per plate, so an 80-plate unit is about 20.7 kg (45.5 lb).

All five share the 526 x 119 mm outline. The B80S publishes a 74.85 GPM maximum against 74.41 GPM for the others, a difference that does not matter in practice. What matters is material and purpose.

The B80 and F80 are 304 stainless with copper braze; the P80 and V80 are 316/316L with copper braze. The F80, P80 and V80 are evaporator models built for refrigerant duty. The B80S is 316 with stainless braze and is the one to use where copper is ruled out. Replacing an evaporator model with a B80S, or the reverse, is not a like-for-like swap even though the piping lines up.

The full designation from the nameplate is best - for example B80SHx50/1P-SPS-M with its connection code - or the SWEP article number. That gives the plate type, plate count, pass arrangement, material, pressure class and connections in one line.

If the plate is unreadable, send the outline dimensions, the port centres, the plate count, and the type and size of each connection, plus the fluids on both sides. On an All-Stainless unit the fluids matter more than usual, because they are the reason the original was specified copper free. With that we can name the exact unit in a quote.

Both are made. The part numbers on file are single-pass (/1P), and SWEP's example designation for the model is a two-pass unit, B80SH/2P-SPS-M.

A two-pass build doubles the path each fluid travels through the pack, giving a closer approach or a larger temperature change at the cost of pressure drop. It suits low-flow, high-temperature-change duties such as some oil coolers. The port positions differ from a single-pass unit, so the two do not interchange on existing pipework. Check the pass code before assuming a match.

These models are catalogued alongside the B80S. Each has its own page with its dimensions, materials and part numbers.

SWEP B80 - The 526 mm standard - and the plate shared by the F80, P80 and V80 evaporators.

SWEP F80 - A copper-brazed 304 stainless evaporator on the 80 frame for chillers and heat pumps.

SWEP P80 - A copper-brazed 316/316L stainless refrigerant evaporator on the 80 frame for chillers.

SWEP V80 - General-purpose evaporator on the B80 frame, 526 x 119 mm, up to 140 plates, 74.41 GPM max flow.