All blowtorches, regulators and other appliances shall be maintained in good condition at all times. No appliances shall be installed in any line which causes or allows the mixture of air or other oxygen carrier with acetylene, except directly at the torch or burner. The use of an expansion tank or tanks in any part of the system is prohibited.
(Coun. J. 12-9-92, p. 25465; Amend Coun. J. 2-7-96, p. 15616)