Boiler fittings and accessoriesedit
Pressuretrols to control the steam pressure in the boiler. Boilers generally have 2 or 3 pressuretrols: a manual-reset pressuretrol, which functions as a safety by setting the upper limit of steam pressure, the operating pressuretrol, which controls when the boiler fires to maintain pressure, and for boilers equipped with a modulating burner, a modulating pressuretrol which controls the amount of fire.
Safety valve: It is used to relieve pressure and prevent possible explosion of a boiler.
Water level indicators: They show the operator the level of fluid in the boiler, also known as a sight glass, water gauge or water column.
Bottom blowdown valves: They provide a means for removing solid particulates that condense and lie on the bottom of a boiler. As the name implies, this valve is usually located directly on the bottom of the boiler, and is occasionally opened to use the pressure in the boiler to push these particulates out.
Continuous blowdown valve: This allows a small quantity of water to escape continuously. Its purpose is to prevent the water in the boiler becoming saturated with dissolved salts. Saturation would lead to foaming and cause water droplets to be carried over with the steam ? a condition known as priming. Blowdown is also often used to monitor the chemistry of the boiler water.
Flash tank: High-pressure blowdown enters this vessel where the steam can 'flash' safely and be used in a low-pressure system or be vented to atmosphere while the ambient pressure blowdown flows to drain.
Automatic blowdown/continuous heat recovery system: This system allows the boiler to blowdown only when makeup water is flowing to the boiler, thereby transferring the maximum amount of heat possible from the blowdown to the makeup water. No flash tank is generally needed as the blowdown discharged is close to the temperature of the makeup water.
Hand holes: They are steel plates installed in openings in "header" to allow for inspections & installation of tubes and inspection of internal surfaces.
Steam drum internals, a series of screen, scrubber & cans (cyclone separators).
Low-water cutoff: It is a mechanical means (usually a float switch) that is used to turn off the burner or shut off fuel to the boiler to prevent it from running once the water goes below a certain point. If a boiler is "dry-fired" (burned without water in it) it can cause rupture or catastrophic failure.
Surface blowdown line: It provides a means for removing foam or other lightweight non-condensible substances that tend to float on top of the water inside the boiler.
Circulating pump: It is designed to circulate water back to the boiler after it has expelled some of its heat.
Feedwater check valve or clack valve: A non-return stop valve in the feedwater line. This may be fitted to the side of the boiler, just below the water level, or to the top of the boiler.11
Top feed: In this design for feedwater injection, the water is fed to the top of the boiler. This can reduce boiler fatigue caused by thermal stress. By spraying the feedwater over a series of trays the water is quickly heated and this can reduce limescale.
Desuperheater tubes or bundles: A series of tubes or bundles of tubes in the water drum or the steam drum designed to cool superheated steam, in order to supply auxiliary equipment that does not need, or may be damaged by, dry steam.
Chemical injection line: A connection to add chemicals for controlling feedwater pH.
The most common fault hydraulic
Plumbing provide us comfort use of water in our homes. Thanks to them increases our comfort, but sometimes they also experience some problems. In many of them there are defects that cause us a lot of disadvantages, the most common failure of this type are broken pipe, broken seals, clogged drains and the like. Not every such failure can repair itself, and is of great importance here, of course, time. The sooner we get rid of it the better, so you should call in this case the appropriate service to take care of it. Today, we find many of them, so it will not be for us to pose any problem. It is better to immediately deal with failure, because the longer we wait, the more it will cause inconvenience.
Where to find advice on plumbing?
Multiple vulnerabilities hydraulic installations can fix it yourself. Often broken pipes or faulty gasket only on the surface it looks awful and in practice can be very easily replaced. To do this, however, you know how to go about it, and this will be useful specific information. Where to find them? The possibilities are many, and one of them is the use of specialized books that we find in almost every bookstore technical support. It is worth to buy one of them, and will certainly be useful to us, it is not time. Another possibility, much simpler and more convenient, is now using the Internet, and there on special pages or forums, you will find plenty of tips and tricks that will allow us to easily be repaired.