Used 15 Square Feet AstroCosmos Metallurgical, Inc.Tantalum Horizontal Heat Exchanger / Condenser. Shell rated 150psi and full vacuum @ 350 F, hastelloy B-3 tubes (SB-333 B3) rated 150 psi and full vacuum @ 350 F. (32) 3/4" tubes x .015 ga. Serial #67741, National Board # 934, Built 1999. Previous Use: API Pilot Plant