boiler main steam stop valves should be

f) It should be controlled that on the boiler all valves are closed tightly. (1) Pressure relief valve. This results in very less pressure drop across the valve. The boiler steam pressure gauge must be connected to the _______ of the boiler. Steam boiler. (2) Nonreclosing pressure relief device. It is usually stayed to the back head of the boiler by means of screw staybolts, or, in the case of double-ended boilers, to the back of the combustion chamber of the other end of the boiler. A power actuated pressure relief valve is a pressure relief valve in which the major relieving device is combined with and controlled by a device requiring an external source of energy. (14) Ligament. Reg. Low condenser vacuum. 281. Furnace 6. Step B: Keep the water level at normal level until the boiler stops producing steam. valves, including main steam stop valves, throttle valves, intercept valves, extraction isolation valves and non-return valves must be tested regularly for freedom of movement and tightness. Wide open; completely. slightly lower than line pressure. In the gate valve the closure membrane is a metal gate. This occurs when cooler steam condenses in the pipes and feeds back into the turbine. Boiler problems Tubes are cylindrical shells of comparatively small diameter constituting the main part of the heating surface of a boiler or superheater. A check valve is normally recommended installed close to the outlet of the stop valve.

When boiler is in shut down condition normal temperature water may be used.-Start the DM water pump as per the start up procedure. Shut the main steam stop valve. When cutting a boiler in on a line equipped with two hand-operated steam stop valves, the steam pressure on the boiler should be----- line pressure. Legend: 1.

The main steam valve should be closed gradually, and the boiler must be cooled. Fuel oil, gas, & coal. (1) Gage (or gauge) pressure. valves Per ASME standards, one NRV is required for one-boiler, high pressure applications (above 15 psig). For high-pressure applications involving multiple steam boilers with manholes that are connected to a common steam main, the steam connection from each boiler must be fitted with two stop valves. A combustion chamber is that part of an internally fired boiler in which combustible gases may be burned after leaving the furnace. (7) Domes. Surfaces to be stayed or reinforced include flat plates, heads, or areas thereof, such as segments of heads, wrapper sheets, furnace plates, side sheets, combustion chamber tops, etc., which are not self-supporting; and curved plates, constituting the whole or parts of a cylinder subject to external pressure, which are not entirely self-supporting. (iii) Diagonal ligament. The following are the procedures for securing one boiler during two boiler operation following the securing of the main steam and bulkhead steam stop valves. (B) Balanced safety relief valve. 4. Manometer and press. Found inside – Page 10With a boiler which is not fitted with a superheater , crack the boiler main steam stop valve ( or its bypass valve ... Under ordinary conditions , the saturatedsteam load of a ship with superheat control boilers should be divided among ... Gas leaks should be located and repaired by a: If a boiler that was online is down because of low steam pressure, the cause is: either a flame failure or low-water condition. This is caused by differing firing rates across the boilers. The boiler is the main functioning component of any steam power plant. Air pump / Air compressor Westinghouse pump (US+) Powered by steam, … Steam pressure gauge. In other words, they prevent steam from flowing back to the main header of the boiler, or back to a boiler that has failed or is off-line. The steam from the boiler first enters into an ant-priming pipe where most of the water particles associated with steam is removed. Repair all leaks promptly. They may be constructed in the form of a dome integral with the boiler or as independent steam vessels connected by piping to the boiler. Found inside – Page 6Steam Closing Stop Valves for Boilers. ... To govern these conditions promptly an arrangement must exist for closing the steam stop valves, feed check valve and operating the furnace fire extinguishers of the injured boiler, ... (iv) Curved bottom plate. (B) Pressure loaded pilot actuated safety valve. this is just an overview; lots of valves and other accessories are missing. (v) Power actuated relief valve.

Due to this, the flow direction changes twice which results in higher pressure drops. Your guide to safer boiler operation High pressure steam boilers in battery (two or more ) require two stop valves in series on each boiler as well as a check valve on each boiler. fuels most commonly used in boilers. In other words, they prevent steam from flowing back to the main header of the boiler, or back to a boiler that has failed or is off-line. Air that controls the combustion efficiency is: Air supply to the burner that is more than the theoretical amount needed to burn fuel is: Air needed for the combustion of fuel is made up of approximately ____% oxygen and ____% nitrogen. A watertube boiler is a steam boiler in which the boiler tubes contain water and steam. Steam (i) Rupture disk device. Correct procedure for water filling in boiler steam drum (2) Main steam stop valve. Main types of boiler valves are as follow: Ball Valve is a quarter turn operated valve. Power Plant Engineering - Volume 28, Issue 1 - Page 173 Steam Stop Valve or Junction Valve. A water wall is a series of tubes or elements spaced along or integral with a wall of a furnace to protect the wall and provide additional heating surface. Found inside – Page 30If there is steam upon any other Stop Check Valve boiler in the plant that could possibly be collect in the pipe ... is par- wheel or handle CRANE 250 ticularly true of the main of the stop valve stop valve in the steam of the boiler ... boilers The safety valves must not be operated. (ii) Electric-resistance-welded tube. A frangible disk device is the same as a rupture disk device. Boiler Stop-Check & Non-Return Valves

A reinforcement is a doubling plate, washer, structural shape, or other form for stiffening or strengthening a plate. A spring loaded, pilot actuated internal temperature. Boilerman 1 & C. - Page 71 Found inside – Page 533When the valve was opened , the steam from the main rushed into the boiler , causing water - hammer which resulted in an explosion . This could have been avoided by equipping the boilers with automatic stop and check valves , in which ... When the demand increases what must be done to maintain pressure? Found inside – Page 34Open the bulkhead stop - valves and regulator valves , and any drain cocks that may be fitted to the main steam range . ... The stop valves on the boilers nearest the turbines should only be opened slightly if priming is to be avoided . This should include an analysis of the average and peak steam loads in . A boiler economizer should be bypassed whenever the . (6) Economizer. Steam Turbines and Boilers - UNIRI

The main stop valve in any steam turbine is the emergency tripvalve. Found inside – Page 194( e ) Main and auxiliary steam stop valves must be readily accessible , operable by one person and arranged to seat against boiler pressure . ( f ) Where vessels are equipped with more than one boiler , the auxiliary steam piping shall ... Fusible plugs are plugs made with a bronze casing and a tin filling which melts at a temperature of 445° to 450 °F. Steam Stop Valve or Junction Valve. Function To control the flow of steam from the boiler to the main steam pipe. To shut off the steam completely when required. Location: This valve is usually mounted over the boiler drum, in the steam pipe leading to-the steam turbine/engine, and between the steam, pipes to stop or regulate the flow of steam. (2) Through stay. A. slightly higher than B. equal to C. slightly lower than D. at any pressure above 75% of The sequence of three numbers found on the data plate attached to a reciprocating feed water pump indicates the: diameter of steam piston, diameter of water piston, and length of pump stroke. A spring loaded pilot valve is a conventional safety valve designed to actuate another spring loaded safety valve through a pressure transmitting line led from the body of the pilot valve. Fill the boiler with feed water to approximately 50-70 mm below normal water level. The try lever is released, and the disk should snap to the closed position against the valve seat. Steam is discharged for 5 sec to 10 sec. (1) Shell. Bell-mouthing is the process of flaring the end of a tube beyond where it is expanded in the tube sheet. Step D: Close the main steam valve. Found inside – Page 2-4BOILERS NOT FITTED WITH SUPER HEATERS , ( 35 ) ( a ) With boiler pressure 5 to 10 pounds above the line pressure , crack the boiler main steam stop valve or by - pass valve , if fitted , from the firerooms rather than from stations ... If a large steam leak occurs in a boiler, shut off the burners, continue to feed water until the fire is out, close the steam stop valve, ease the safety valves, clear the furnace of gases, close the registers, and cool the boiler slowly. The following state regulations pages link to this page. Combitherm Ultra Boilers | Combi Boiler (Ultra Model).

At the beginning, the main steam valve should be opened slowly when the steam pressure rises to 0.4~0.5MPa, and it should not act too violently. (2) Main steam stop valve. Boilers equipped with a superheater must be protected during warm-up by: keeping the superheater drain valve open until the boiler is cut in on the line.

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