bids are invited for refilling of helium gas cylinder isi marked filled high pressure seamless steel 7cu. m. industrial helium gas cylinder of 46.7 ltrs. w.c. as per is:7285 / part 2:2004 having working pressure of 150 kgf / cm2 & hydraulic test pressure of 250kgf / cm2 fitted with , refilling of argon gas cylinder isi marked filled high pressure seamless steel 7cu. m. industrial argon gas cylinder of 46.7 ltrs. w.c. as per is:7285 / part 2:2004 having working pressure of 150 kgf / cm2 & hydraulic test pressure of 250kgf / cm2 fitted with v , refilling of canister std-1 12 ppm ( minimum ) he:12ppm ( minimum ) h2:18.5% ( minimum ) o2:1000ppm ( minimum ) ch4:50ppm ( minimum ) co:0.5% ( minimum ) co2:12ppm ( minimum ) ethylene 12ppm ( minimum ) ethane :12ppm ( minimum ) acetylene : balance n2 in 10lttr. capacity aluminum , refilling of canister std-2 100 ppm he:100 ppm h2:2% o2: ( minimum ) 5000ppm ch4:50ppm 250 ppm co: 6% co2:100 ppm ethylene 100 ppm ethane:100 ppm acetylene : balance n2 in 10lttr. capacity aluminum cyln. with brass valve, pt-20% ca-2%, stability 24 months, , refilling of canister std-3 500 ppm he:10000ppm h2: 6% o2:60000 ppm ch4:20000ppm co: 7% co2: 500ppm ethylene 500 ppm ethane:500ppm acetylene : balance n2 in 10lttr. capacity aluminum cyln. with brass valve, pt-20% ca-2%, stability 24 months, pressure 130 title gases for gas chromatograph total quantity : 5