Applications Condensation control. Where pipes operate at below-ambient temperatures, the potential exists for water vapour to condense on the pipe surface. Moisture is known to contribute towards many different types of corrosion, so preventing the formation of condensation on pipework is usually considered important.
adrian-I'd suggest you re-read metengr's post a bit more slowly. Nothing in the post states that the test shall be below freezing. To rephrase the post: The water temperature shall be no less than 30°F higher than the MDMT but not to exceed 120°F.
Cold temperatures can cause plumbing pipes to freeze and is a serious water damage risk during winter weather. According to the Institute for Business and Home Safety, claim payments by all insurance companies in the past decade for those kinds of losses have exceeded $4 billion.
Fire safety experts say preventing pipes from freezing is significantly easier than dealing with a frozen or cracked pipe. And, to get in front of the problem, the emphasis should be on keeping warmer air circulating around the plumbing.
Recently, a frozen pipe burst in the basement of Stephen King collector Gerald Winters, allowing for gushing water that destroyed a number of original King manuscripts. It wasn't the first time freezing temperatures allowed for property destruction, and it certainly won't be the last. When supply ...