supply of liquefied petroleum gas (lpg) for metal cutting, conforming to is:4576/1999 (reaffirmed 2009), shall be supplied in the cylinders of supplier of 19 kg capacity . the supply shall be made on a door-delivery basis, as and when required by sse/c&w/snf. after consumption, the empty cylinders shall be returned by the railways, and the supplier shall arrange prompt collection of the empty cylinders from the designated location.liquefied petroleum gas (lpg) for metal cutting, conforming to is:4576/1999 (reaffirmed 2009), shall be supplied in the cylinders of supplier of 19 kg capacity . the supply shall be made on a door-delivery basis, as and when required by sse/c&w/snf. after consumption, the empty cylinders shall be returned by the railways, and the supplier shall arrange prompt collection of the empty cylinders from the designated location.,liquefied petroleum gas (lpg) for metal cutting, conforming to is:4576/1999 (reaffirmed 2009), shall be supplied in the cylinders of supplier of 19 kg capacity . the supply shall be made on a door-delivery basis, as and when required by sse/c&w/snf. after consumption, the empty cylinders shall be returned by the railways, and the supplier s hall arrange prompt collection of the empty cylinders from the designated location. [ warranty period: 30 months afte r the date of delivery ] ]