Regarding the urea denitration process, the issue of heat tracing and insulation for the denitration pipelines

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There is a urea denitration project that uses steam as the heat source for the mixing tank and the urea solution storage tank; the steam condensate is then discharged into the condensate tank via a trap. The hot water in the drain tank is pumped by a drain pump to the urea pipeline; together with this pipeline, they are covered with an insulation layer to provide heat tracing for the urea solution pipeline. The return water from this heat tracing system goes back to the drain tank, and this cycle repeats itself. Can this process meet the insulation requirements for urea pipelines? With such a cycle, the temperature of the water-repellent layer will decrease – will the urea solution inside the pipelines crystallize? It’s not clear whether this is how things operate in practice Then can the steam’s moisture be discharged to the drain tank at the bottom of the mixing tank through a drain valve? Is a pressure pump not needed? Thank you!