On the boiler water tube, boiler feed water flows through the pipes into the drum. Circulated water is heated by the combustion gas to form steam in the steam area in the drum. This calderas pitotubulares is chosen if the steam and steam pressure requirements are very high as in the case of boilers for power generation.
Very modern water tube boilers are designed with a steam capacity between 4,500 – 12,000 kg/hour, with very high pressure. Many water tube boilers are constructed in packages if fuel and gas fuel is used. For water tubes that use solid fuels, it is not commonly designed in packages.
The characteristics of water tube boilers are as follows:
1) Forced, induced and balanced drafts help to improve combustion efficiency.
2) Less tolerant of the quality of water produced from water treatment plants.
3) Allows for a higher level of heat efficiency.
As for the advantages of using a water pipe boiler, namely a large steam capacity of up to 450 THP, operating pressure reaching 100 bar, a relatively large value of efficiency, and easier maintenance because the furnace is easily accessible for checking, cleaning and repairing. more detailed construction, the initial investment is relative because the price of a water pipe boiler is more expensive than a fire pipe boiler, it is more difficult to handle incoming water because the supporting components are sensitive, and require a wider range due to its ability to produce greater steam capacity.
Based on the pressure produced the boiler is divided into 2 types namely low-pressure boiler (Low Pressure) and high-pressure boiler (High-Pressure). Low-pressure boilers have a steam operating pressure of less than 15 psig or produce heat with pressures below 160 psig or temperatures below 2500F. High-pressure boilers have a pressure steam operation above 15 psig or produce hot water with pressure above 160 psig or temperatures above 2500F. Based on the circulation of boiler water divided into 2 namely natural circulation boilers and forced circulation boilers.