sealing arangements for casing

8/10/2019 Sealing Arangements for Casing

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Sealing Arangements for Casing

Gland seal systems are very important to main and auxiliary turbines. Turbine shafts must exit their

casings in order to couple up or connect with the unit that the turbines drive (reduction gears, pumps,

etc.) The main and auxiliary gland seal systems enable the turbine to be sealed where the shaft exits the

casing; in effect keeping "air out and steam in."

The purpose of gland seal system is to prevent the leakage of air from the atmosphere into turbine

casings and prevent the escape of steam from turbine casings into the atmosphere (see Figure 1).

Operation Overview

1. The pressure differential between the atmosphere and inside the main engine turbine casing will vary

depending on ship's speed. Similarly, the differential between the atmosphere and inside the ship's

service turbine generator (SSTG) turbine casing will vary depending on electrical load.

2. Labyrinths- Sets of labyrinth packing are employed along the turbine rotor where the rotor exits the

turbine casing to maintain this pressure differential.

a. The labyrinths create many little chambers causing pressure drops along the shaft. The number of

labyrinth sets depends greatly on the steam pressure possible in that area. Labyrinth packing alone will

neither stop the flow of steam from the turbine nor prevent air flow into the turbine.

3. Gland Sealing Steam

a. The gland sealing system provides low pressure steam to the turbine gland in the final sets of

labyrinth packing. This assists the labyrinth packing in sealing the turbine to prevent the entrance of air

into the turbine, which would reduce or destroy the vacuum in the associated condenser. Excess pressure

(excess gland seal) is removed by the gland seal unloader.

4. Gland Exhaust

a. Since there are times when steam escapes from the seals, a gland exhaust system is provided. The

gland exhaust system consists of low pressure piping connected to the gland area between the last two
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outer sets of labyrinths which receives and prevents steam from escaping to the atmosphere. This system

collects the steam and directs it to a condenser for further use in the steam plant.

C. Main Engine Gland Seal System Components.

1. The gland seal regulator (see Figure 2)

a. Senses system pressure on the outlet side of the regulator. The gland seal regulator valve reduces 150

psig auxiliary ("dry or wet" steam depending on the ship type) steam to gland seal system pressure of .5

to 2 psig. The valve begins to open at 2 psig and is fully open at .5 psig. The bypass valve allows the

operator to maintain system pressure in the event the regulator valve is inoperable. (see Figure 1)

2. The Gland seal unloader valve (see Figure 3)

a. This valve senses the pressure of the gland seal supply piping. The unloader piping is wider indiameter than the regulator piping. The gland seal unloader "dumps" the excess gland seal piping

pressure to the LP turbine exhaust trunk. The unloader begins to open at 2 psig, and is fully open at 3

psig. It has a handwheel to permit manual operation of the unloader to control gland seal system

pressure during a loss of control air causality.

Piping system (see Figure 1)

a. The regulator supplies the gland seal header. This header has branch lines to each turbine gland area

and a branch line to the unloader. The ahead throttle valve assembly and the astern throttle valve also
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have a connection to receive gland sealing steam. The reason is the same on the unloader- to prevent the

possible introduction of air into the system. Any air entering the turbines or piping systems affect the

vacuum in the main condenser.

b. On some ships, spectacle flanges are installed in the supply lines to the HP turbine glands to allow the

gland seal and gland exhaust system to be isolated when singling up with the LP turbine operating.c. Inputs to the gland seal system include the gland seal regulator, astern throttle leak-off, ahead throttle

lifting rod leak-off, HP turbine forward and after gland leak-off, and main steam emergency throttle

leak-off (on ships with singling up capabilities).

4. Main engine gland exhaust system

a. Steam leaking from the gland seal section of the shaft packing is drawn off by the gland exhaust

system. Gland exhaust is drawn into the gland exhaust condenser section of the Main Engine Air Ejector

b. The gland exhaust steam is then condensed and returned to the fresh water drain collecting tank. The

air and non-condensable gases are drawn off by the gland exhaust fan.5. Gland Seal steam system operation

a. The gland seal regulator supplies .5 to 2 psig steam to the glands in varying degrees as bells change on

the main engine. When answering a low bell or all stop, the gland leak off is minimal, causing the

regulator to supply the total gland sealing steam. As engine speed increases, the casing is pressurized

and the increased gland leak off, along with the regulator, supplies all the gland sealing steam required

by the system.

(1) As ship's speed increases, the main engine becomes self sealing. The gland seal regulator is fully

shut and the unloader is functioning to maintain the system pressure between 2 3 psig, dumping the

excess gland seal steam to the LP turbine exhaust trunk.

(2) As ship's speed slows, the gland seal system operates in reverse sequence. (see Figure 4,5,6)

D. SSTG Gland Seal System Components
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1. These components are almost identical to the main engine gland sealing components. The major

difference between the main and SSTG system is the size.

a. The Gland seal regulator

(1) Senses pressure on the drain pot (or manifold). The drain pot or manifold is similar to a header and

acts as "collection area" for the system steam. This area allows for the sensing lines to accuratelymeasure the system pressure. The valve functions by reducing 150 psig auxiliary steam to the system

pressure of .5 2 psig.

2. The Gland seal unloading valve

a. Senses the pressure on the drain pot. The operating range is 2 3 psig, unloading excess gland seal

pressure to the lower section of the turbine exhaust casing.

3. The piping system (see Figure 7)

a. Consists of piping to the forward and after glands from the drain pot or manifold. The inputs to the

system are gland seal regulator, and the forward turbine bearing. At a 60% load on the generator,

leakage from the forward end of the turbine (high pressure end) supplies the system, the regulator is

closed and the unloader bleeds excess to the turbine exhaust trunk.

E. Gland Exhaust System

1. Steam leaking from the gland seal area of the shaft packing, steam leak off from the steam chest lift

rods, and steam leak off from the trip throttle valve is drawn into the gland exhaust system and into the

air ejector condenser.

2. The steam is condensed in the SSTG air ejector condenser. Air and non condensable gases are

discharged to the atmosphere via the gland exhaust fan which maintains a slight vacuum on the auxiliary

air ejector condenser.

F. Causes of System Failure

1. Since most gland seal regulators are air operated reducing valves, improper pressure settings on the

air pilots for the regulating and unloading valves can cause system pressure to be too high or low, or
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both valves may be open at the same time. Ruptured diaphragms may occur in these air pilot controllers

and air operated valves. Oil and water in the air lines to the pilots or air operated valves can cause erratic

operation and deterioration of the rubber diaphragms. Upon loss of air pressure, both valves fail open

and the unloader valve must be operated with the manual handwheel to control gland seal pressure.

2. Painted valve stems or improper packing installation can cause binding of the stem, restricting valveoperation.

3. Improperly calibrated gages can cause the system to be improperly operated.

4. In the event of a jammed gland seal regulator, the operator should take control of gland seal pressure

by using the regulator bypass valve.

G. Safety Precautions

1. Do not admit steam to the glands of an idle turbine, as varying degrees of corrosion, erosion, or a

bowed rotor may result.

2. Ensure the gland seal system is in operation on the main engine before aligning the main engine airejectors. This helps prevent dirt and debris from being drawn into the turbine glands.

3. Adjustment of components shall be conducted by qualified and knowledgeable personnel. When

performing adjustments, careful coordination of involved personnel will minmize confusion of gage

indication.


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The purpose of the gland steam system is to reduce steam leakage to a minimum and to prevent air

ingress.

Steam leakage leads to the requirement for increased make up; this increases the load on the feed andboilerwater treatment chemicals and to a deterioration of the working environment surrounding thepower plant.

Air ingress leads to a loss of vacuum and hence reduction in plant efficiency , and causes problems ofthermal stressing around the gland as well as increases oxygen content of the exhaust steam.

SystemThe system consists of a set of glands fitted to theturbine,and a steam supply and exhaust system toservice them.

The system above shows the two means of controlling the gland receiver pressure; the first is by havinga dump in split range with the make-up valve, the second is the use of a pressure regulating valve whichdumps excess pressure to the exhaust line. The normal operating pressure is around 0.1 to 0.2 bar.

Gland steam condenser

The gland steam condenser is cooled by the condensate extracted from the main condenser and so actingas a feed heater.The gland steam often shares its condenser with the air ejector reducing the cost ofhaving two units.

A fan is fitted to induce a flow through the system without incurring a negative pressure in the finalpocket as this would allow the ingress of air. This is ensured by the fitting on valves to the exhaust linefrom the glands so enabling the back pressure to be set.

MiscellaneousA vapour hood is sometimes fitted with extraction at negative pressure reducing leakage still further.

The turbine rotor is shaped to prevent oil which leaks from the bearing traveling down the rotor andentering the gland.
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Schematic of pockets on inlet end of HP turbine

There are two pockets in the glands fitted to all the ends of the turbine; the inner pocket is connected tothe gland steam supply and the outer to the exhaust line . The HP turbine has to further inner pocketsdue to it having to deal with steam at higher pressures and hence increased leakage. The innermostpocket simply passes leakage steam back to the casing a few stages downstream, the next pocket passesthe leakage steam to the HP turbine exhaust.

When the engine is stopped the gland steam make-up supplies the system requirements. When theengine is in use the flow of steam to the supply pocket of the inlet end to the HP end reverses and thegland starts to supply the system reducing the quantity the make-up has to provide. At full power the

only gland requiring steam will be the exhaust end of the LP turbine, the other will be either supplyingthe system or supplying themselves sufficiently to not require steam from the system. In this conditionthe make-up would be shut and the pressure regulated by the dump opening.

Principle of the Labyrinth Gland

The leakage of steam is reduced by the use of labyrinths, these provide a tortuous path for the steam tonofollow to exit the turbine reducing the pressure across a series of fine clearances to a level that caneasily be managed by the gland steam system.Within the cavity where the flow is turbulent, the velocity of the steam is increased with an associateddrop in pressure. The kinetic energy is then dissipated by the change in direction, turbulence and eddycurrents.fugal action. Very small heads can deal with large pressure drops


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MaterialsA typical clearance between the rotor and the fixed gland is about 0.25 to 0.38mm, hence with very littlerotor distortion the possibility of rub occurs. This has led to the use of soft, self lubricating materials forthe gland segments.

The simplest form of gland consists of carbon rings held on to the shaft by the use of garter springs.

Carbon Dioxide is formed with contact with superheated steam making this material only suitable forlow temperature requirements.

Brass and Copper led alloys have been found suitable with an alloy of Lead, Copper and Nickel beingsuitable up to 520oC.

Shaft RubShould the rotor bend, say due to carry over the area of rub on the gland will be over a small arc. Withsuccessive revolutions the heat generated will increase bend. This increases the area of contact andmagnifies the condition by the increased generation of heat.

Plastic flow occurs when the material yields under compression to reduce the stress and on cooling apermanent set occurs.

One side of the gland, typically the stationary part is made up of thinned sections thereby reducing thecontact area to a minimum. Spring loaded glands prevent this from happening by giving under contactwith the rotor , limiting the heat generated and giving time for the rotor to recover its shape.

Spring backed gland

The minimum clearance for a spring backed gland ranges from 0.3 mm fot eh HP inlet to 0.63 mm forthe Astern turbine. For fixed glands the minimum is 0.5 mm. With the smaller clearances there is an

increase in efficiencyHydrostatic GlandA wheel forged on the rotor ends runs in a water bath. This water is flung out by centrifugal action. Thegland only needs to be small as large pressure drops require little head.

Gland steam condenser

The gland steam condenser is cooled by the condensate extracted from the main condenser and so acting as a feedheater.The gland steam often shares its condenser with the air ejector reducing the cost of having two units.

A fan is fitted to induce a flow through the system without incurring a negative pressure in the final pocket as this would allowthe ingress of air. This is ensured by the fitting on valves to the exhaust line from the glands so enabling the back pressure tobe set.


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MiscellaneousA vapour hood is sometimes fitted with extraction at negative pressure reducing leakage still further.

The turbine rotor is shaped to prevent oil which leaks from the bearing traveling down the rotor and entering the gland.

Schematic of pockets on inlet end of HP turbine

There are two pockets in the glands fitted to all the ends of the turbine; the inner pocket is connected to the gland steamsupply and the outer to the exhaust line . The HP turbine has to further inner pockets due to it having to deal with steam athigher pressures and hence increased leakage. The innermost pocket simply passes leakage steam back to the casing a fewstages downstream, the next pocket passes the leakage steam to the HP turbine exhaust.

When the engine is stopped the gland steam make-up supplies the system requirements. When the engine is in use the flowof steam to the supply pocket of the inlet end to the HP end reverses and the gland starts to supply the system reducing thequantity the make-up has to provide. At full power the only gland requiring steam will be the exhaust end of the LP turbine, the

other will be either supplying the system or supplying themselves sufficiently to not require steam from the system. In thiscondition the make-up would be shut and the pressure regulated by the dump opening.

The system cannot be used on reversible sets as the seal effect is lost at reduced revolutions. It is morelikely to be seen on turbo-alternators.


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Principle of the Labyrinth Gland

The leakage of steam is reduced by the use of labyrinths, these provide a tortuous path for the steam to nofollow to exit theturbine reducing the pressure across a series of fine clearances to a level that can easily be managed by the gland steamsystem.Within the cavity where the flow is turbulent, the velocity of the steam is increased with an associated drop in pressure. Thekinetic energy is then dissipated by the change in direction, turbulence and eddy currents.fugal action. Very small heads candeal with large pressure dropsMaterials

A typical clearance between the rotor and the fixed gland is about 0.25 to 0.38mm, hence with very little rotor distortion thepossibility of rub occurs. This has led to the use of soft, self lubricating materials for the gland segments.

The simplest form of gland consists of carbon rings held on to the shaft by the use of garter springs. Carbon Dioxide is formedwith contact with superheated steam making this material only suitable for low temperature requirements.

Brass and Copper led alloys have been found suitable with an alloy of Lead, Copper and Nickel being suitable up to 520oC.Shaft Rub

Should the rotor bend, say due to carry over the area of rub on the gland will be over a small arc. With successive revolutionsthe heat generated will increase bend. This increases the area of contact and magnifies the condition by the increasedgeneration of heat.

Plastic flow occurs when the material yields under compression to reduce the stress and on cooling a permanent set occurs.

One side of the gland, typically the stationary part is made up of thinned sections thereby reducing the contact area to aminimum. Spring loaded glands prevent this from happening by giving under contact with the rotor , limiting the heat generatedand giving time for the rotor to recover its shape.

Spring backed gland

The minimum clearance for a spring backed gland ranges from 0.3 mm fot eh HP inlet to 0.63 mm for the Astern turbine. Forfixed glands the minimum is 0.5 mm. With the smaller clearances there is an increase in efficiency.

Hydrostatic Gland

A wheel forged on the rotor ends runs in a water bath. This water is flung out by centrifugal action. The gland only needs to besmall as large pressure drops require little head.


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The system cannot be used on reversible sets as the seal effect is lost at reduced revolutions. It is more likely to be seen onturbo-alternators.


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14/75

The hub was then connected to a shaft and, as the wind blew, due to the angle of the sails, the sails rotated causing the hub to rotate

and so turned the shaft. The shaft was then coupled to a ' Mill-Wheel ' used for grinding corn to make flour and other uses.
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