If it is suspected that the problem is condensation, then a room should be sealed off with a dehumidifier left running for the recommended time and then further instrument tests made. If the dampness has disappeared, then condensation is very likely the problem.
For Suncor Energy in Alberta , Canada, investigated transients in bybass/blow-off line from OTSG boilers which caused large expansion loops to deform enough to damage adjacent electrical cable racks and be dislocated from their pipe supports. On a second trip investigated waterhammer explosion in steam discharge line from Steam Generator. Wrote report explaining three different waterhammer scenarios in kPa steam line and recommended corrective action. For Oil Sands site, conducted nineteen 6-hour training classes for workers in Ft. McMurray, Alberta. Investigated and explained transients in the two-phase condensate return line being used to lift condensate to a flash tank at oil sands site. (If you think about it, you can't lift condensate in a two phase condensate-return line without transients).
Once all joints are soldered, and cool, you can now test your system. Open valve and faucets to bleed out air. Check for leaks. If you encounter leaks, you will need to re-sweat the leaking copper joints. Be sure to wash the outside and flush the inside of the copper joints to prevent copper oxidation.
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Which? explains the best way to get rid of condensation and mould. Find out how to tackle it, including things you can do yourself for little money or for ...