[danavuia.1987]

In an water treatment plant  it is using liquide chlorine from containers for water disinfectin.
Why does ice appear on pipe?
Temprerature of environment is 21-24 celsius grade.

[chenbeier]

Are u sure it is liquid chlorine and not a solution of Hypochlorite or something?  On the other hand what is boiling point of liquid chlorine? Maybe that answer your question.

[danavuia.1987]

Boiling point -34 celsius brade
Freezing point -101 celsius grade

[P]

In an water treatment plant  it is using liquide chlorine from containers for water disinfectin.
Why does ice appear on pipe?
Temprerature of environment is 21-24 celsius grade.

Does the chlorine leave the pipe nozzle under pressure at all? The sudden reduction in pressure as any pressurised liquid or gas leaves a pipe causes rapid cooling according to PV = NRT.  This rapid temperature decrease could cause freezing of water vapour from the air to freeze around the pipe.