What is priming in a boiler?

What is priming in a boiler?

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.

How Internal treatment is being done to the boiler?

Common internal chemical feeding methods include the use of chemical solution tanks and proportioning pumps or special ball briquette chemical feeders. In general, softening chemicals (phosphates, soda ash, caustic, etc.) are added directly to the fee-water at a point near the entrance to the boiler drum.

What is important to check when starting up the boiler from cold ships?

Starting Boiler and Pressure Rise Check that the air valve is open if the boiler pressure is below 1.0 bar. Start the burner on manual control and on low load. Check that the water level does not rise too high during the pressure rising period. Drain via the blow down valves if the water level is too high.

How do you conduct test the boiler water?

Boiler Water PH Test

1. Rinse and fill the plastic 50ml beaker with sample water.
2. After that is done, add 600mg of PH reagent (one scoop) to the water sample.
3. Mix the reagent in the sample water to completely dissolve it.
4. Next, take a PH indicator strip, dip it into the sample, and leave it submerged for one minute.

What is the purpose of the anti priming pipe?

This anti-priming pipe filters the water content from the steam and allows only dry steam to enter into the superheater. The superheater receives the water-free steam from the anti-priming pipe. It increases the temperature of the steam to the desired level and transfers it to the steam stop valve.

What are disadvantages of priming and foaming?

It may be caused by impurities in the water, which foams up as it boils, or simply too high a water level. It is harmful to the valves and pistons, as lubrication is washed away, and can be dangerous as any water collecting in the cylinders is not compressible and if trapped may fracture the cylinder head or piston.

What is internal treatment explain it?

Internal treatment is the process of conditioning impurities in the boiler system that is subject to evaluation. Its main function is that it appropriately reacts with water hardness, removes oxygen and prevents water from foaming in the boiler systems.

Which of the following conditioning method is used in internal treatment?

Internal Treatment. – carbonate conditioning, calgon conditioning.

What are the procedures in starting up a boiler?

Typical Startup Process Open the sight gauge and water column high- and low-water shut-off valves. Make sure the water level safety controls are blown out. Close the bottom blowdown valves, then open the upper drum vent valves. Start filling with soft water.

What is the first thing that should be checked when taking over a boiler watch?

The most important factor or the first thing to be checked after coming upon the bridge is the position and speed of the ship. Once you are satisfied with the position of the ship on the chart, it is a good practice to browse through the chart and the course to be followed till the end of your watch.

What are boiler water tests?

Boiler water tests Hydrate Alkalinity – For testing the presence of hydrates. Neutralized Conductivity – For testing the presence of ferrous ions and metal contents. Condensate PH – Measuring the acidity or alkalinity of the water. Phosphate – For testing the presence of phosphate compounds.

What is phosphate test in boiler water?

A boiler phosphate test kit is commonly used to monitor proper phosphate residuals in the boiler water, hot water, or steam boiler. A typical phosphate residual in boiler water is between 10 to 20 ppm of phosphate or 7 ppm of phosphate per 1 ppm of hardness.

How is an internal boiler inspection carried out?

In a manual internal boiler inspection, an inspector must physically enter the boiler, which requires the company to build scaffolding for the inspector to stand on during the inspection. Once the inspection is complete, the scaffolding must then be taken down after the inspection.

What is the Inspection Code for a water tube boiler?

The In-Service Inspection code for your water tube boiler is ASME Section VII. The inspection regulation is different from one location to another location by regulated jurisdiction. In some states, the inspection by an authorized inspector of the insurance company is mandatory.

How is the convection section of a boiler inspected?

The convection section is inspected for deposits especially when oil has been fired. There may be deposits that are not readily removed by water washing. Ash from fuel oil firing can form a glass like deposit which may be very difficult to remove even with chemical cleaning. Sometimes the tubes must be replaced.

What kind of instrument is used for boiler inspection?

A pit gauge is used to measure the depth of pits. Boiler tubes can be internally inspected by a fiberscope type of instrument that can give a TV picture of the inside of the tubes. Sometimes sections or tubes may be cut out for inspection and replacement.