234512-1937-Notice-to-Aircraft-Owners-and-Ground-Engineers-No-4-of-1937 — Page 1

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THE HONG KONG GOVERNMENT GAZETTE, JANUARY 29, 1937.

No. 67.

DIRECTORATE OF AIR SERVICES, HONG KONG.

Notice to Aircraft Owners and Ground Engineers

No. 4 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, it is essential that 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.

Air

Grey

Nil

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

thread of 14 T.P.I.

Acetylenc

Maroon

Nil

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

thread of 14 T.P.I.

Carbon Dioxide

(C.O.).

Black

Nil*

External 0.860′′ B.S.W., R.H. thread of 14 T.P.I.

Oxygen (0)

Black

Nil

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

thread of 14 T.P.I.

Nitrogen (N)

Dark Grey

Black

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

thread of 14 T.P.I.

Sulphur Dioxide

(8.02).

Green

Yellow

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

thread of 14 T.P.I.

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

3. Gas Cylinders on which the contents are not clearly indicated in accordance with the relevant British Standards Specification, should not be used for the purposes mentioned in paragraph 1, above.

4. Owing to the possibility of danger arising from con- necting a high pressure gas cylinder direct to an aircraft system, a reducing valve or safety valve which will ensure that the pressure applied to the system is kept within a safe range, should be incorporated.

G. F. HOLE, Director of Air Services.

27th January, 1937.