System Requirement
Product
MMDI PMDI TDI 1. Impervious Spill Containment T T T 2. Material of Construction
Unlined Carbon Steel S T T Lined Carbon Steel S S S Stainless Steel S S S 3. Tanks: General
Above Ground T T T Safe Access to Top of Tank C C C Adequate Tank Capacity T T T 4. Pressure/Vacuum Rating
Known Working Pressure Rating and Vacuum Rating T T T API or ASME Rated C C C 5. Dry Air or Nitrogen Pad T T T 6. Venting T T T 7. Pressure/Vacuum Protection
Primary Vacuum Protection T T T Secondary Vacuum Protection C C C Primary Pressure Protection T T T Secondary Pressure Protection C C C 8. Level Indicator T T T 9. Level Alarms
Low-Alarm C C C High-Alarm C C C 10. High-Level Switch
Independent of level indication system C C C Terminates flow into tank C C C 11. Temperature Control T T T Temperature Indicator T T T Low Temperature Alarm C C C High Temperature Alarm C C C Insulation T S S 12. Agitation/Re-circulation
Tank Agitator S S S Tank Re-circulation System C C C 13. Transfer Pump
Sealless Type C C C Pressure gauge on discharge side of pump T T T Drain valves capped or plugged
when not in use T T T Located Inside Containment C C C 14. Piping
Carbon Steel N/A T T Stainless Steel T S S Heat Tracing T S S Insulation T S S 15. Gasket T T T 16. Filters/Strainers S S S Drain/Vent Valves With Caps or Plugs T T T Pressure Gauge on Both Sides of Filter T T T Located Inside Containment C C C Temperature Control T S S 17. Safety Considerations T T T Shower & Eyewash T T T Fall Protection T T T
(MMDI) Monomeric Methylene Diphenyl Diisocyanate
(PMDI) Polymeric Methylene Diphenyl Diisocyanate
(TDI) Toluene Diisocyanate
[T] - Equipment typically found on storage tanks that service the identified diisocyanate, and helps provide a basic level of protection against spills, leaks, or injuries. The accompanying text provides additional information.
[C] - Equipment that also helps provide protection against spills, leaks, or injuries of the identified diisocyanate. The accompanying text provides additional information.
[S] - Selection of this equipment depends on the specific product application, there may be several alternatives available. Additional
information and guidelines are presented in the accompanying text.