Tender For liquefiedpetroleumgas (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.