Decreasing waters boiling point while under pressure 2

[CraigH88]

I work for a company that uses steam to cure new sewer pipe. In the process condensation builds up in low spots (sags in host pipe) and prevents the material from curing. I'm working on an additive to be injured (liquid or pellets)into the pipe to reduce the boiling point of condensation to return to vapor, prevent condensation, and improve thermal conductivity of the steam and material being cured.

Current consideration is ethanol injection.

Delivery method as a liquid or absorbed into a material that would aid in nucleation of the water to reach a low boiling point of the condensation.

Also considering an exothermic additive.

End goal is remove condensation in sags of pipe while under pressure. To prevent the insulation of condensation build up.

 

[LittleInch]

Have you thought about things like this?

https://www.petersenproducts.com/Drain-Flusher-Sewer-Cleaning-Tools-s/1955.htm

or

https://www.petersenproducts.com/Drain-Flusher-Sewer-Cleaning-Tools-s/1955.htm#109

Go down to no 109

You can insert them into small holes and retract and use it to sweep the water out once you get to curing temp.

I can see why you're investigating a chemical system, but both the materials, delivery methods and inability to target it seem to make it very speculative. IMHO.

Mechanical means to either boil off the water (heat tracing) or sweep it out of the way looks like a more profitable use of time to investigate?

Or pull through an air line which blow the condensate down the line?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[georgeverghese]

I would also echo @pierre's suggestion : What about using plain hot air to keep the pipe warm at 130degF during curing instead of steam ?

 

[CraigH88]

Would sodium bicarbonate tables be affective at mixing the water in the sags to help transfer the heat though the pools of water. Maybe m mixed with Detergent to help carry the water?

 

[EdStainless]

We had a factory process that heat cured.
We switched from all steam to a little steam and a lot of heated air.
We would run just air (250-300F) until our outlet temp reached about 180F.
Then we would bleed in some steam at 250F to increase heat transfer.
The steam was not more than 1/4 of our total flow.

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