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[rezairan]

Dear fellows

I am working in an Ammonia grass root project which we have now a discussion with our engineering section whether to use water jacket for the secondary reformer or heat sensitive paint without water jacket.
I have seen a lot of ammonia plants in which all secondary reformers are jacketted and this is the first time I am facing with this question , that is to use paint instead of water jacketting.
I would like you to help me in this regard and share your experiences with me to see the benefits of water jacketting or painting in comparison with each other.

Thanks in advance.

Reza

[Zahid]

The use of jacket or paint depends on the temperature of shell of the secondary reformer. its purpose is alarm the situation when shell temp increased beyond its design temperature.

As the parameters inside secondary reformer are almost similar, the quality of insulation will predict the type of refractory used in the shell. In water jacketed vessels castable refractory is used in which shell can expose temperature above CS failure temperature. While in painted shell insulating refractory is used which does not allow the temperature to rise The temperature of the shell does not exceed the failure temp of Carbon steel.