1996 Evapco 3-Fan Ammonia Blast Evaporator with E.L. Nickell Surge Drum. Evapco model: NTC3 - 93103 - 15M. Rated at 40 tons for a -30°F room with a -20°F saturated suction temperature (10° TD). Refrigerant: flooded R-717. Features the Thermal-Pak finned coil: 92.5 sq. ft. face area, 10 rows deep, 3 fins per inch, and 24.3 cu. ft. volume coil. MAWP: 250 PSIG. US Electrical , 15 or 3.75 hp. E.L. Nickell Company Ammonia Surge Drum-400 Gallon. Inside straight-wall dimensions: 2 ft. 5 in. dia. x 12 ft. 3 in. L. MAWP: 150 PSI @ 650° F. MDMT : -20° @ 150 PSI. Surge drum overall dimensions: 14 ft. 2 in. L x 4 ft. 4 in. W x 6 ft. 2 in. H. Evapco overall dimensions: 19 ft. 7 in. L x 9 ft. 1 in. W x 5 ft. 8 in. H.(ACN335) (BF).