Cylinders to be approved by the Authority,
Cylinder
valves to be
closed so usS
to prevent
Irukage.
Provisions as
to protection
of cylinder
valves.
Testing of cylinders.
42
"permanent gas" means any dangerous goods of category 2 class 1; "store" when used as a noun means a place which is used for the
storage of any compressed, liquefied or dissolved gas.
88. Any cylinder or container shall be of a type approved by, and shall be maintained in good condition to the satisfaction of, the Authority.
89. The valve of any cylinder shall be securely closed to a lo prevent leakage.
90. (1) Any cylinder containing an inflammable or poisonous gas shall be provided with a stout metal cap or metal cover enclosing the valve and securely attached to the body of the cylinder, or shall be otherwise so designed that the valve is protected.
(2) No part of any such cap or cover shall be in contact with any part of the valve or valve body.
(3) Except in the case of cylinders containing hydrocyanic acid, any such cap or cover shall be provided with a vent of such size as to prevent gas pressure forming inside the cap or cover, "
(4) The valve of any cylinder containing an inflammable gas shall be provided with left-handed screw threads for the pipe or other con- nexion. or with some other device to prevent improper connexion approved by the Authority.
(5) Except in the case of cylinders containing acetylene, oil a similar lubricant shall not be used on any valve or other fitting of any cylinder.
91. (1) Except in the case of cylinders containing dissolved gases. any cylinder shall be tested by a person approved by the Authority in accordance with the hydraulic test specified in the appropriate specilica- tion of the cylinder at intervals not cxceeding five years:
Provided that cylinders filled with carbon dioxide used for fire fighting need not be tested until a period of ten years has elapsed for the time of installation.
(2) Prior to any hydraulic test the cylinder shall be thoroughly cleaned and examined externally and so far as is practicable internally for surface defects, corrosion and foreign matter.
(3) Where excessive internal rust or foreign matter is observed the cylinder shall be cleaned by wire-brushing, shot blasting or rumbling scraping, boiling or steaming or be heated to a temperature not exceed ing 572 Fahrenheit, and after cleaning each cylinder shall again be examined and shall be thoroughly dried before being refilled with gas.
43
(4) After each hydraulic test and before being used the cylinder shall be thoroughly dried internally and shall be stamped with marks and figures indicating by whom and on what date the lest was conducted.
92. The name of the gas contained in the cylinder and the name Marking of
cylinders. and address of the person, company or firm by whom the cylinder was filled shall be legibly shown upon the outside of any cylinder, or upon a label securely attached by wire thereto, and, where any cylinder is mataimed in any receptacle, the receptacle shall be similarly marked in red:
Provided that where any such receptacle is coloured red the marking may be in any suitable colour.
93. (1) The pressure in any cylinder at 149° Fahrenheit shall not exoxed three quarters of the hydraulic test pressure to which the cylinder has been submitted.
Pressure in cylinder pot
to exceed three quarters of text
(3) The provisions of paragraph (1) shall not apply to cylinders pressure. containing carbon dioxide which are fitted with a bursting disc which bursts at a pressure not exceeding two thousand eight hundred and fifty pounds per square inch.
94. The liquid portion, if any, of the gas in any cylinder shall Liquid por- not occupy more than ninety-five per cent of the capacity of the cylinder tion in it 149° Fahrenheit.
cylinder not
La exceed ninety-five per cent of the capacity.
95. No cylinder containing permanent gas shall at 60° Fahrenheit Maximunt fave a working or internal pressure exceeding-
pressures da
cylinders
(a) one thousand five hundred pounds to the square inch in the containing
case of boron trifluoride;
(b) one thousand nine hundred and eighty pounds to the square
inch in the case of Duorine; or
(c) in the case of any other gas, the maximum pressure permitted
by the specification to which the cylinder was manufactured.
permanent gus.
96. In the case of cylinders used or to be used for containing Liquelled fiquefied gases-
(a) every precaution shall be taken to cosure that the gas used for
filling the cylinder is free from moisture;
(1 a notice shall be attached to the outside of the cylinder and receptacle containing the cylinder, if any. to indicate that it should be kept as cool as possible;
gases.