Used 15 Square Feet AstroCosmos Metallurgical, Inc.Tantalum Horizontal Heat Exchanger / Condenser. Shell rated 150psi and full vacuum @ 350 F, tubes rated 150 psi and full vacuum @ 350 F. (20) 3/4" tubes x .015 ga (tantalum 2.5% w). Serial #67740, National Board # 927 Built 1999. Previous Use: API Pilot Plant