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.
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