Table of Contents
What are the common problems in boiler tubes?
Stress Corrosion Cracking. Various corrosion mechanisms contribute to boiler tube failure.
What is choking in boiler?
If boiler water is poorly managed the impurities may build up at bends or locations that restrict normal flow. Those impurities like calcium carbonate has poor heat transfer characteristics which can easily make them to cake at those locations and cause scales that can choke the boiler tubes.
What causes failure of boiler tubes?
Failure of boiler tubes is a very common phenomenon in a power plant. There are many reasons for boiler tube failures such as pitting, stress corrosion cracking, stress rupture, creep, erosion, and thermal fatigue [4], [5], [6], [7], [8]. The failed boiler tube in this investigation is made from 20G steel.
Why is my steam boiler not turning on?
If the boiler ran low on water, was refilled, but the burner will not turn back on, it is likely the low water cut-off valve needs to be reset. Models without automatic resets have a reset button on the valve itself. These valves should be flushed weekly to ensure they remain in proper working condition.
How do I find a leak in my boiler tube?
If the boiler tube leakage occur , the symptoms are :
- Feed pump continuous running.
- Feed water consumption higher than normal.
- Low water level in the boiler water drum and steam pressure drop.
- White smoke from boiler uptake.
What causes failure of boiler tube Mcq?
Explanation: hardness of water causes failure of boiler tube. hardness in water will form deposits on the tube water surfaces which will lead to overheating and failure of tubes.
What is priming and carryover?
Boiler water carry-over is the contamination of the steam with boiler-water solids. Priming is the carryover of varying amounts of droplets of water in the steam (foam and mist), which lowers the energy efficiency of the steam and leads to the deposit of salt crystals on the super heaters and in the turbines.
What is boiler problem?
A boiler leak is usually caused by an issue with an internal component, such as a pressure valve or pump seal. If the leak stems from your pressure relief valve, it is likely that your system’s pressure has become too high. Should the leak be due to a problem with the pump seal, the seal could have worn out.
What is the material of boiler tubes?
Boiler tubes are seamless tubes and are made of either carbon steel or alloy steel. They are widely used in steam boilers, for power generation, in fossil fuel plants, industrial processing plants, electric power plants, etc.
What is chemical cleaning of boiler tubes?
Proper chemical cleaning removes deposits from the inside of boiler tubes which improves the boiler heat rate, reduces tube failures and improves the stability of boiler chemistry. However, chemical cleaning is expensive.
Why would I need to re-tube my boiler?
Pitting in the boiler is one of the most common reasons for re-tubing a boiler. Above is a fire-tube boiler tube with scale and pitting present. While the pitting was not extensive, the depth of the pits on a majority of the tubes led to a boiler re-tube.
Why are boilers so difficult to maintain?
Abstract. Boilers, the most troublesome components of electric power, chemical and processing plants generate high costs in unscheduled shutdowns, repairs and power replacement. Every occurrence of ruptured tubes leads to emergency shutdown of the entire plant.
How to clean a boiler safely?
Chemical cleaning of your boiler is one of the ways to assure safe and efficient operation. Care must be exercised, however, to clean a boiler only when needed. Techniques such as deposit loading or contamination-required cleanings can be used to determine when to clean.