1998 API Schmidt-Bretten Plate Heat Exchanger. Model SIGMA 108. S/N B980289-101, P/N: 4-108-GBH-153-002. 316 Stainless steel plates: Qty: 153. Heat transfer surface area: Approx. 1,524 sq.ft. Design pressure: 300 psig. Design temperature: 300 °F. Minimum temperature: 32 °F. Test Pressure: 450 psi. Fixed end ports: (4) 8 in. Overall dimensions: 70 in. L x 33-1/2 in. W x 82 in. H. Cool 752 gpm of oil from 250 °F to 155 °F, using 1,600 gpm of glycol in at 130 °F and out at 152.7 °F. The oil section had a pressure drop of 4 psi and the glycol section had a pressure drop of 9 psi.