Alfa Laval Spiral Heat Exchanger. Model: 1-HC. S/N: 18058. Nat'l Bd: 13696. MAWP: 150 psi @ -20 to 625 °F. Surface: 60 sq. ft. Head material: SA-516-70 carbon steel. Head thickness: 1.35 in. Shell material: SA-516-70 carbon steel. Shell thickness: 0.1875 in. The spiral heat exchanger consists of a strip of metal wound around a central core to form two concentric spiral channels - one for each of the fluids between which heat is to be transferred. Normally intended for liquid/liquid services or condensing smaller rates of vapor. Flows are normally counter-current. Inlets: (1) 2 in. dia. cold-side flanged port, (1) 6 in. dia. hot-side flanged port. Outlets: (1) 2 in. dia. cold-side flanged port, (1) 6 in. dia. hot-side flanged port. Overall dimensions: 40 in. L x 32 in. W x 32 in. H. (ACN150-86).