Table of Contents
- 1 What is the most dangerous effect of scale build up in the boiler water space?
- 2 What are the effects of mineral deposits in boiler water?
- 3 What is the recommended hardness concentration of a boiler water?
- 4 What is foaming in boiler?
- 5 What are the common problems in boiler feedwater system?
- 6 How do you remove oxygen from boiler water?
What is the most dangerous effect of scale build up in the boiler water space?
Eventually, scale built-up will cause the tube to overheat and rupture. Boiler deposits can also cause plugging or partial obstruction of corrosive attack underneath the deposits may occur.
What are the effects of mineral deposits in boiler water?
The insulating effect of deposits also causes the boiler metal temperature to rise and lead to tube-failure by overheating. Large amounts of such deposits throughout the boiler would reduce the heat transfer enough to drop the overall boiler efficiency.
What are the harmful effects of oxygen in boiler water?
Oxygen in water produces pitting that is very severe because of its localized nature. Water containing ammonia, particularly in the presence of oxygen, readily attacks copper and copper bearing alloys. The resulting corrosion leads to deposits on boiler heat transfer surfaces and reduces efficiency and reliability.
What causes scale formation?
The precipitation of impurities from the feed water on the heat transfer or metal surface on the boiler causes scale formation. Scale formation occurs due to salts that are not completely insoluble in the boiler water. Hence the salts reach the surface in a soluble form and precipitate.
What is the recommended hardness concentration of a boiler water?
In boilers the hardness of the water can cause the formation of scale and sludge or mud. The hardness must be removed in the makeup water to the return system. Total hardness should not exceed 50 PPM.
What is foaming in boiler?
Bubbles or froth actually build up on the surface of the boiler water and pass out with the steam. This is called foaming and it is caused by high concentration of any solids in the boiler water. Priming may be caused by improper construction of boiler, excessive ratings, or sudden fluctuations in steam demand.
What is scaling in water?
Scaling occurs when water has high levels of minerals like calcium carbonate, which can build-up on surfaces. Increased levels of scaling, however, can be harmful. Hot-water heaters are the most common place for scale formation in a home water system.
Why are boiler troubles considered to be hazardous?
Boiler explosions are of a particular danger in (locomotive-type) fire tube boilers because the top of the firebox (crown sheet) must be covered with some amount of water at all times; or the heat of the fire can weaken the crown sheet or crown stays to the point of failure, even at normal working pressure.
What are the common problems in boiler feedwater system?
Avoiding the four most common design issues with feedwater tanks can help reduce problems with your boiler feedwater system.
- Inadequate Heating of Feedwater.
- Improper Cold-Water Makeup Design.
- Incorrect Feedwater Pump Location and Design.
- Chemical Injection Location.
How do you remove oxygen from boiler water?
Heat is the most common method for removing oxygen. Typical deaeration for smaller boilers utilizes a spray or combination spray and tray system to remove oxygen. The feed water is sprayed into a stream of 5 psig steam for efficient heat transfer and subsequent oxygen removal.
What are boiler troubles?
Boiler troubles: Sludge, scale, priming and foaming, caustic embrittlement, boiler corrosion are collectively known as boiler troubles. A. Caustic Embrittlement: (Inter crystalline cracking of boiler metal) It is the intercrystalline cracking of boiler due to Na2CO3.