Terminal · Storage
LPG Spheres & Bullets
Pressure vessels that keep propane, butane and other NGLs liquid by holding them under pressure: spheres for large volumes and horizontal bullets for smaller ones.
What it does
Light products would boil off in an atmospheric tank, so they are stored as pressurized liquid. High pressure tanks can be run with virtually no evaporative losses. Pressure relief valves protect each vessel.
Basics
| Products | Propane, butane, NGL mixes |
| Shapes | Sphere or horizontal bullet |
| Pressure tank classes (EPA) | Low 2.5 to 15 psig, high above 15 psig |
| Protection | Pressure relief valves |
Common failures
- Relief valve that does not reseat and keeps venting product
Troubleshooting
- Symptom
- Relief valve venting product
- Likely cause
- Set pressure wrong or drifted, or a valve fault
- What to check
- Test and reset or repair the relief valve