To define and secure boilers safely, some professional specialized organizations such as the American Society of Mechanical Engineers (ASME) develop standards and regulation codes.For instance, the ASME Boiler and Pressure Vessel Code is a standard providing a wide range of rules and directives to ensure compliance of the boilers and other pressure vessels with safety, security and design standards. A boiler that has a loss of feed water and is permitted to boil dry can be extremely dangerous.If feed water is then sent into the empty boiler, the small cascade of incoming water instantly boils on contact with the superheated metal shell and leads to a violent explosion that cannot be controlled even by safety steam valves.
Draining of the boiler can also happen if a leak occurs in the steam supply lines that is larger than the make-up water supply could replace.
The Hartford Loop was invented in 1919 by the Hartford Steam Boiler and Insurance Company as a method to help prevent this condition from occurring, and thereby reduce their insurance claimsŹródło: https://en.wikipedia.org/wiki/Boiler#Safety
Other ways to promote the plumbers is displaying posters in the city and distributing leaflets advertising the company in which they work.On the Internet you can also find pages with the ranking of plumbers, where are published opinions on them. Therefore, the more plumbers are trying to do their job well, because they know that some negative reviews posted about them can effectively discourage the use of their services.