Overview cargo vent solutions for compliance with OSV Chemical code 1122(30).
3 ways to comply for existing vessels:
XPL - directional dispersion discharge
Submerged termination of pipe-away cargo vents
Advantages
- Harmful gases eliminated from deck area
- Complies with NMA alternative solutions
- Tank pressure below the required demand
for 0.6 bar
- Increased cargo deck space available
Disadvantages
- Not accepted by all classification societies
- Uncertain pressure condition in the cargo tank
- Flame arrester needed below pressure side
- Submerged pipe subject to biofouling
- Effective tank pressure still high
Directional dispersion discharge control of cargo vents
Advantages
- Harmful gases angled away and ejected into a natural ventilation zone
- Increased velocity for discharge.
- Extended directional dispersion
- Complies with NMA alternative solutions
- Tank pressure from 0.2 bar
Disadvantages
- Alternative solution accepted by Norwegian Maritime Authority only
- Harmful gases not fully eliminated from deck area (compared to submerged solution)
- Cargo deck space is still restricted
(compared to submerged solution)
Submerged over pressure termination
