235496-1937-Notice-to-Aircraft-Owners-and-Ground-Engineers-No-11-of-1937 — Page 1

THE HONG KONG GOVERNMENT GAZETTE, MAY 21, 1937.

No. 361.

DIRECTORATE OF AIR SERVICES,

HONG KONG,

Notice to Aircraft Owners and Ground Engineers.

No. 11 of the year 1937.

GAS CYLINDERS:

PRECAUTIONS TO BE TAKEN.

1. As several kinds of compressed gas are now used for various purposes in connection with civil aviation, precautions should be taken to prevent one kind being mistaken for another.

2. British Standards Specifications Nos. 341 and 349 give particulars of the identification markings for gas cylinders, and the dimensions for the connections on valves for gas cylinders, respectively. The following particulars have been extracted for guidance :-

Identification markings.

Gas contained.

Ground Colours

Colour. of Bands.

Dimensions of connection on valve.

417

Air

Acetylene

Grey

Nil

Maroon

Nil

Carbon Dioxide

(C.0).

Black

Nil*

Oxygen (0)

Black

Nil

Interual " B.S.P., R.H.

thread of 14 T.P.I.

Internal B.S.P., L.H.

thread of 14 T.P.I.

External 0,860′′ B.S.W., R.H. thread of 14 T.P.I.

Internal B.S.P., R.H.

thread of 14 T.P.I.

Nitrogen (N)

Dark Grey

Sulphur Dioxide Green

(S.02).

Black

Internal " B.S.P., R.H.

thread of 14 T.P.T.

Yellow

External B.S.P., R.H.

thread of 14 T.P.I.

1

*White or aluminium coloured bands are used in the tropics.

3. Compressed nitrogen may be used as a substitute for compressed air in high pressure systems pertaining to controls or units such as wing flaps, air brakes, pneumatic oleo legs

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