#STEAM DOWNLOAD STOPPING AND STARTING MANUAL#

Open the valves to the steam consumers carefully in order to avoid water chocks.

Open the main steam valve and close the by-pass valve.

If the boiler is not provided with a by-pass valve, the main steam valve should be used to heat-up and pressurise the steam system.

Open the by-pass valve slowly to heat-up and pressurise the steam system.

Change to automatic control of the burner when the boiler pressure is 0.5 bar lower than the working pressure of the boiler.

If required, check all flange joints on the plant.

Tighten all covers such as manholes, hand holes, inspection doors, etc.

A pressure reading should be indicated on the boiler pressure gauge before the air valve is closed.

If the air valve was opened close it when only steam blows out.

Drain via the blow down valves if the water level is too high.

Check that the water level does not rise too high during the pressure rising period.

#STEAM DOWNLOAD STOPPING AND STARTING MANUAL#

Start the burner on manual control and on low load.Check that the air valve is open if the boiler pressure is below 1.0 bar.Check that the gauge board valve and pressure gauge valves are opened.The following work procedures must be followed during start-up of the boiler. Check the burner and the safety functions according to the manufacturer instruction.Pre-heat the fuel oil if the burner should operate on heavy fuel oil. Check the oil system and start the fuel oil supply pump.Check that the water level control system is connected and operational.The water level gauges should be blown down several times to ensure a correct indication. Check frequently during the complete start-up. Check the water level in the water level gauges.Otherwise the pump motor will be overloaded. When filling a pressure less boiler, the shut-off valve after the feed water pump must be throttled.If the temperature difference between the boiler and feed water exceeds approximately 50✬, the boiler must be filled very slowly. The water level rises due to expansion when the boiler is heated. Fill the boiler with feed water to approximately 50 mm below normal water level.

Open the feed water valves and the air valve.Check that the main steam valve, by-pass valve and circulation valves if provided, scum valve, and blow-down valves are closed.Precautions on Starting Boilerīefore start-up of the boiler plant, following general work and check procedures must be considered. The article explains starting and stopping boiler during normal and emergency working conditions. Between each operation interval the burner should remain stopped for approximately 8-10 minutes. The burner must therefore only be operated at minimum load and in intervals of 1-2 minutes for the first hours. When heated the water vaporises and expands which might cause fissures and cracks in the refractory. This is because the new refractory still contains a small amount of water.

It might be necessary to perform a number of start/stop sequences to reduce the lighten-up rate.Īt the commissioning start-up of the boiler and after any repair work of the refractory, it is very important to further reduce the lighting-up rate. When the boiler is started, the lighten-up rate of the boiler must not be accelerated too much as this might cause an unnecessary over strain of the boiler material by quick and uneven temperature rises.

Steam download stopping and starting