GIDC DEGREE ENGINEERING GIDC DEGREE ENGINEERING COLLEGECOLLEGE BRANCH- CIVIL

ENROLLMENT NO 131100106038-PATEL SHARADKUMAR KIRITBHAI 131100106053-SHARMA TANISHQ 131100106051-SHAH ASHIT 131100106023-PANCHAL HEMIK VIRALBHAI 131100106018-MANIYA KRUNAL KALYANBHAI 131100106044-RAITHATHA MADHAV KETANKUMAR 131100106013-KACHHADIYA JATIN 131100106041-PATEL VISHALKUMAR G 131100106019-MENDPARA MITULKUMAR M 131100106043-RADADIYA PRASHANT RASIKBHAI

BOILER MOUNTINGS AND ACCESSORIESBOILER MOUNTINGS AND ACCESSORIES(Dec 05, Dec 08)(Dec 05, Dec 08)

Boiler Mountings:

The necessary devices installed or mounted for

the safety of boiler and its control are called

boiler mountings.

BOILER MOUNTINGS AND BOILER MOUNTINGS AND ACCESSORIESACCESSORIES

(Dec 05, Dec 08)(Dec 05, Dec 08)

Boiler Mountings for safety:

1. Two water level indicators – 22. Two safety valves.3. Combined high steam and low water safety

valve.4. Fusible plug.

BOILER MOUNTINGS AND BOILER MOUNTINGS AND ACCESSORIESACCESSORIES

(Dec 05, Dec 08)(Dec 05, Dec 08)

Boiler Mountings for control:

1. Pressure gauge2. Junction or stop valve3. Feed check valve4. Blow-off cock5. Man hole and mud hole

BOILER MOUNTINGSBOILER MOUNTINGS

BOILER MOUNTINGSBOILER MOUNTINGS

1. WATER LEVEL INDICATOR (Dec 05, Dec 08)

Function: Indicate the water level inside boiler

Location: fitted at front end of boiler

Construction◦Water cock◦Steam cock◦Drain cock◦Glass tube◦Metal tube

BOILER MOUNTINGSBOILER MOUNTINGS

2. PRESSURE GAUGE (Bourdon’s) (Dec 05)

a) Records gauge pressure

b) Elliptical spring tube is also called

Bourdon tube and is made up of

special quality Bronze.

c) Plug (P) is provided for cleaning

the siphon tube.

d) Siphon is filled with cold water to

prevent the hot steam entering

into the bourdon tube and spring

tube remains comparatively cool.

Function: indicates the pressure of steam in boiler

Location: mounted on front top of the shell or on the drum

Construction:◦ Dial : to read the pressure◦ Needle◦ Circular bent bourdon tube with oval cross

section◦ U tube (siphon)◦ Toothed quadrant, link, pin & pinion

SAFETY VALVESSAFETY VALVES

LEVER SAFETY VALVEDead Weight safety valve

SAFETY VALVESSAFETY VALVESSPRING LOADED SAFETY VALVE

HIGH STEAM AND LOW WATER SAFETY VALVE

Function: release excess steam when pressure inside boiler increases higher than safe pressure (maximum pressure)

Location: mounted on top of boiler shellTypes: There are four types of safety valve

I. Dead weight safety valveII. Lever safety valveIII. Spring loaded safety valveIV. High steam low water safety valve

JUNCTION VALVE:

The valve placed directly on a boiler in order to regulate the steam supply from boiler to steam pipe is called the Junction Valve.

STOP VALVE:

The valve used to regulate the steam supply from the steam pipe to the prime mover (steam engine or steam turbine) is called Stop Valve.

JUNCTION VALVEJUNCTION VALVE

FEED CHECK VALVEFEED CHECK VALVE

1. Feed check valve works as NRV (Non- return valve).

2. Prevents the back flow of water from the boiler when the feed water pump is either not working or in case of its failure.

Function:◦ Control the supply of water to boiler◦ Prevents the back flow of the water from

boiler when feed pump pressure is less than boiler pressure or pump is stopped

Location: fitted in water space of boiler just below the normal space of water

Construction:◦ Non return valve (NRV)◦ Water inlet pipe & water outlet pipe◦ Spindle, gland & hand wheel

BLOW-OFF COCKBLOW-OFF COCK

Function: ◦ discharge periodically a portion of water

which contains mud, scale or sediments at bottom of boiler vessel

◦ To empty boiler when necessary for cleaning, inspection and repair

Location: fitted on boiler shell directly or through the short branch

Construction:◦ Conical gun metal plug having rectangular

hole◦ Spindle with yoke

FUSIBLE PLUGFUSIBLE PLUG Plugs P and R

are made up of Gun Metal.

Plug S is made up of Copper.

Plug R is screwed to the plug P.

Plug S is locked into plug R by a metal like tin or lead.

Function: to protect boiler against damage due to overheating caused by low water level in boiler

Location: fitted on the fire box crown plate or over the combustion chamber

Construction:◦ Two hollow gun metal body◦ Conical plug◦ Fusible metal (like tin, lead having low

melting point)

MANHOLEMANHOLE

This is provided at suitable position on the

boiler shell so that the man can enter into

boiler shell for inspection, maintenance

and repairs. This hole is usually made in

elliptical shape of the size convenient for a

man to enter through this hole. The

opening is closed by steam tight cover.

STEAM TRAPSTEAM TRAPSteam trap is used to collect and

automatically drain away the water resulted

from partial condensation of steam without

steam to escape with this condensate

through a valve. The valve after draining

the condensate is closed. Is presses the

leakage of steam from the trap.

,

ANTIPRIMING PIPEANTIPRIMING PIPE

It is attached below the stop valve to avoid the

water particles being carried away along with

steam. It has closed pipe with closed ends of 1m

and 2m length. The top side of the pipe has

perforations. When the steam passes through it,

due to inertia effect, the moisture of steam falls

into the pipe and the steam with reduced moisture

passes into the stop valve.