Inquire About Our Sheet Metal Machines Now!

Gas Cylinder Color Code Chart: A Comprehensive Guide


Table 1. Gas Cylinder Color Code Chart

No.Gas NameChemical FormulaCylinder ColorLetteringLetter ColorRing Color
1AcetyleneC2H2WhiteAcetylene – Keep away from open flameBright red
2HydrogenH2Light greenHydrogenBright redP = 20, light yellow single ring
P = 30, light yellow double ring
3OxygenO2Light (thioindigo) blueOxygenBlackP = 20, white single ring
4NitrogenN2BlackNitrogenLight yellowP = 30, white double ring
6Carbon DioxideCO2Aluminum whiteLiquid Carbon DioxideBlackP = 20, black single ring
7AmmoniaNH3Light yellowLiquid AmmoniaBlack
8ChlorineCl2Dark greenLiquid ChlorineWhite
10TetrafluoromethaneCF4Aluminum whiteFreon-14Black
11MethaneCH4BrownMethaneWhiteP = 20, light yellow single ring
P = 30, light yellow double ring
12Natural GasBrownNatural GasWhite
13EthaneC2H6BrownLiquefied EthaneWhiteP = 15, light yellow single ring
P = 20, light yellow double ring
14PropaneC3H8BrownLiquefied PropaneWhite
15ButaneC4H10BrownLiquefied ButaneWhite
16Liquefied Petroleum Gas (LPG)Industrial useBrownLiquefied Petroleum GasWhite
Residential useSilver grayLiquefied Petroleum GasBright red
17EthyleneC2H4BrownLiquefied EthyleneLight yellowP = 15, white single ring
P = 20, white double ring
18ArgonArSilver grayArgonDark greenP = 20, white single ring
P = 30, white double ring
19HeliumHeSilver grayHeliumDark green
20NeonNeSilver grayNeonDark green
21KryptonKrSilver grayKryptonDark green
22Carbon MonoxideCOSilver grayCarbon MonoxideBright red

Gas Cylinder Conditions:

(1) Used within the inspection period:

a. Seamless steel gas cylinders:

Cylinders for corrosive gases, diving cylinders, and cylinders in contact with seawater shall be inspected every 2 years. General purpose cylinders shall be inspected every 3 years. Inert gas cylinders shall be inspected every 5 years. Cylinders that have exceeded 30 years of service life shall be registered and scrapped without inspection.

b. Welded steel gas cylinders:

Cylinders for corrosive gases shall be inspected every 2 years. General purpose cylinders shall be inspected every 3 years. Corrosive gas cylinders shall be scrapped after 12 years.

c. Liquefied gas cylinders:

From the date of manufacture, the inspection period for the first three inspections is 4 years each, and the inspection period for the fourth inspection is 3 years. They shall be scrapped after 15 years.

d. Acetylene gas cylinders: Inspected every 3 years.

(2) The gas cylinder shall have no defects, mechanical damage, or severe corrosion. Corrosion spots should be less than 2mm × 200mm.

(3) The paint color, lettering, and ring markings on the gas cylinder surface shall comply with the regulations and shall have a gas cylinder warning label. (See Table 2-1-1 in the attached document)

(4) All safety accessories shall be complete and intact – Gas cylinder accessories include burst disks, safety valves, fusible alloy plugs, cylinder valves, cylinder caps, and shock-absorbing rings.

How useful was this post?

Click on a star to rate it!

Average rating 0 / 5. Vote count: 0

No votes so far! Be the first to rate this post.

As you found this post useful...

Follow us on social media!

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Just a Step Away!

Sheet Metal Machines Await!

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top