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13/4/2018 · For boiler water, the ideal amount of hardness, chlorine, P-Alkalinity, P-H, Specific Density, hydrazine and phosphate level should be; 0, <100, 100-150, 9.5-11.5, <1.002, 0.1-0.2, 20-50 respectively. The boiler water treatment process consists of De-contamination and adding suitable chemicals based on the test results.
The following disadvantages of fire tube boiler are: The fluctuation of load cannot be easily handled. The rate of steam generation is low. A Fire boiler is used in small power plants. The maximum working pressure is up to 20 bar which is a less comparatively water tube boiler. Overall efficiency is …
12/3/2013 · 1) These types of boilers have light weight construction. 2) Efficiency compared of the smoke tube boilers is much higher and those can be used to generate the high pressure steam. 3) Efficiency of combustion in this type of boiler is always good. 4) Thermal stresses are less as the water circulation is very good inside the tubes.
25/7/2017 · In the water tube boiler, the water and steam flow inside the tubes and the hot gases flow over the outside surfaces. Where as in fire tube boilers hot gases from combustion travels through the tubes. flue gases produced from furnace where fuel is burnt.
Marine boilers are of two types namely the water tube boiler and the fire tube boiler. The water tube type boiler is used for high-pressure, high-temperature, high-capacity applications. The Main boiler design depends on its application, ie. for motor ships, a
24/2/2012 · A water tube boiler is such kind of boiler where the water is heated inside tubes and the hot gasses surround them. This is the basic definition of water tube boiler. Actually this boiler is just opposite of fire tube boiler where hot gasses are passed through tubes which are surrounded by water.
The movement of water is much faster than the fire tube boiler because of conventional flow, hence the rate of heat transfer is high which results in higher efficiency. Water boiler: Overall efficiency is up to 90%. In the water boiler: The maximum working pressure is 250 bar or you can say 140 kg/cm2.
16/4/2021 · Ship natural gas fire tube boiler manufacturers List of boiler types, by manufacturer – Wikipedia. There have been a vast number of designs of steam boiler, particularly towards the end of the Belleville boiler: an early marine water-tube boiler fire-tube boiler with multiple small fire-tubes that reverse the direction of gas flow within the
26/11/2010 · Marine boilers are usually of the two-drum water-tube type with water cooled furnaces and heat recovery equipment of the economizer or air-heater type. The majority of ships are fitted with two boilers, although some large passenger ships may have three or more. Thanks a lot. A boiler is defined as "a closed vessel in which water or other
Types and Working of Marine Boiler - MirMarine
The water-tube boiler is those boiler in which the water is present inside the tubes and fire or hot gases surround these fire tubes. The examples of water tube boilers are a La-Mont, Benson, Stirling, Babcock and Wilcox, Yarrow and Loeffler boiler.
17/10/2020 · Yarrow Boiler is another type of water boiler. It was developed by Yarrow & Co in London. The Loeffler boiler widely used on ships, particularly warships. For more Information you can read here: Yarrow Boiler wikipedia Water Tube Boiler Advantages: The following
The water tube boiler is employed for high-pressure, high-temperature, high-capacity steam applications, e.g. providing steam for main propulsion turbines or cargo pump turbines. Firetube boilers are used for auxiliary purposes to provide smaller quantities of low-pressure steam on diesel engine powered ships.
A water tube boiler can be defined as a Steam boiler in which the flow of water in the tubes, as well as hot gases, enclose the tubes. Not like fire tube boilers, this boiler attains high-pressures, as well as high-steam capabilities, can be achieved.
The boiler is supported at the water drum and the water wall lower headers, and there are no rigid connections at any other points in order to allow for thermal expansion. Furnace Closely spaced water wall tubes of 76.2mm outside diameter, form the membrane walls at the side, roof, except for burner opening, rear, and front of the furnace.
A boiler explosion is a catastrophic failure of a boiler.There are two types of boiler explosions. One type is a failure of the pressure parts of the steam and water sides. There can be many different causes, such as failure of the safety valve, corrosion of critical parts of the boiler, or low water level.
Boiler Survey Schedule. Auxiliary water tube boiler which is 8 years old to be surveyed every year and the survey interval can be extended to 2 ½ years if the surveyor is satisfactory of correct feed water treatment with proper boiler water analysis. Two boiler surveys are required during each 5 year period of the classification certificate.