The World LP Gas Association was established in 1987 in Dublin, Ireland, under the initial name of The World LPG Forum. The World LP Gas unites the broad interests of the vast worldwide LP Gas industry in one organisation. It was granted Category II Consultative Status with the United Nations Economic and Sl Cociaouncil in 1989. The World LP Gas Association exists to provide representation of LP Gas use through leadership of the industry worldwide.
In their Guide to Good Industry Practices for LP Gas Cylinder Management
Chapter 5: Manufacturing, Sub Section 5.6: Zinc Metal Spray. They specfic coat of Zinc prevent external corrosion and ensure longer life of the cylinder
· The purpose of applying zinc metal spray is to prevent external corrosion and ensure longer life of the cylinder. The decision to specify zinc metal spray is often a question of ambient conditions and economics. The cost should be compared with the result of cylinder corrosion experienced in a particular location. If a high proportion of the cylinders in the location show evidence of external corrosion then the use of zinc metal spray is probably justified.
· There are also safety reasons for applying zinc metal spray i.e. where the location experiences high external corrosion rates - for example near the coast where sea water corrosion is likely - this can lead to LP Gas leakage through the cylinder wall which sometimes can be catastrophic if a large area of metal has failed.
· If zinc metal spray is required, it should be applied to the external surfaces of cylinders, including the shroud and foot ring, within three hours of grit blasting.
· A minimum coating of 40 microns should be evenly applied in accordance with EN 22063. The area beneath and inside the foot ring which is more prone to corrosion should be coated to a minimum thickness of 100 microns.
· Adhesion test on the zinc metal spray should be carried out in accordance to EN 22063 after application.