VOT (Vapour off take)
These are the normal type of cylinders which you would find in your homes, restaurants and other small commercial establishments. In this process, the vapour which is naturally converted inside the cylinder is sucked out and used for your applications. The rate at which liquid LPG is naturally converted into LPG vapour is approximately around 0.4 to 0.7 kgs/hr. Vaporization depends upon factors like ambient temperature, size of cylinders, size of valve etc. Required Cylinders are connected to the manifolds with first, second and third stage of regulating systems thus ensuring exact pressure and flow rate as required by for the end user. Improper designing of the system will leads to insufficient pressure and flow rate which results in sweating of cylinders and higher volume of residue accumulation in the cylinder causing huge fuel loss to the user. Improper designing of the system will also lead to safety problems which may be turned into a disaster.
VOT applicable installation standards and specification
- IS 6044(Part-1), Code of Practice for LPG storage installations.
- Oil Industry Safety Directorate (OISD),MoPNG guidelines.
- National Fire Protection Association(NFPA), LPG code 58
Recommended safety systems.
- Non Return valves and flame arrestors
- Standard quality isolation valves.
- Auto change over system and two pressure reducing stations (PRS)
- Gas leak detection system.
Advantages of VOT
If the burner consumption flow rate is higher than vapourisation capacity of the total no of cylinders then the cylinder starts to sweat and it leads to non availability of LPG at burner point. However 450 Kg and 47.5 kg capacity cylinders are available in the market to avoid this handicap to certain extent