What piece of equipment is needed to feed liquefied chlorine gas from a ton cylinder?

The correct piece of equipment needed to feed liquefied chlorine gas from a ton cylinder is a chlorinator. A chlorinator is specifically designed to control the flow of chlorine gas and introduce it into the water supply safely. It ensures that the gas is properly metered and used efficiently for disinfection purposes.

While an evaporator can be involved in converting liquid chlorine into gas, its primary function is not to feed the gas into a water treatment system. Instead, it would convert the liquefied chlorine into a usable gas form but would not regulate the dosage or manage the feeding into the system itself.

A filtration unit is not related to the delivery or feeding of chlorine gas; it is used to physically remove particles and impurities from water.

A pressure regulator helps to control the pressure within a system, which is important, but it does not provide the necessary mechanism for delivering chlorine into the water effectively. The chlorinator fulfills that role specifically, making it the essential piece of equipment for safely and accurately feeding liquefied chlorine gas.