Table of Contents
What is gland sealing in steam turbine?
The turbine gland sealing system (TGSS) prevents the escape of steam from the turbine shaft and casing penetrations and the glands of main steam stop and control valves. This system also prevents air leakage into the low pressure turbine glands.
Why gland steam is used in turbine?
FUNCTION OF GLAND STEAMING IN TURBINE OPERATION. gland steam providing a seal between turbine shaft and turbine casing . so gland steam protect the leakage of steam outside of the turbine and also and suck the ambient air inside . In a turbine, rotor rotates inside the casing.
What is a pump gland seal?
From Wikipedia, the free encyclopedia. A stuffing box or gland package is an assembly which is used to house a gland seal. It is used to prevent leakage of fluid, such as water or steam, between sliding or turning parts of machine elements.
What material is used in turbine glands?
carbon
To date, nobody has discovered, produced or invented a material for turbine glands that can better carbon. For this reason, carbon is widely employed in this capacity, except in one or two countries like Italy and the U.S.A. where soft packing glands arc preferred. Carbon glands arc reliable.
What is a clearance seal?
Labyrinth seals and clearance seals are minimum-leakage seals that protect machine elements from contamination through a noncontact method. They operate on the principle of positive clearance and do not rub on shafts or housing.
How do you calculate gland packing?
Simply measure the inner diameter of the bore of the stuffing box and subtract from it the outside diameter of the shaft. The figure obtained must be divided by 2 to get your gland packing size.
How does gland seal water work?
This gland seal water serves three important functions: it enables the pump shaft to rotate within its sleeve with minimum friction, it prevents the slurry from back-flowing into the seals and damaging the shaft, and. it allows for a small amount of cooling of the pump shaft, which heats up as it rotates at high speeds …
What is gland sealing in a turbine?
Gland sealing is done for preventing the air ingress into turbine or condenser. As you ask correct time to charge gland sealing in our 250 MW KWU turbine gland sealing is charged when condenser pressure reaches -0.1 Kg/ Cm2 during unit light up.
How does a steam turbine seal work?
Sealing steam is regulated at just above atmospheric pressure, and is conducted to the space between two or more individual gland packing rings within the “gland” at the exhaust end of the turbine casing, to seal the gland against the ingress of air.
Should gland sealing be done before vacuum pulling?
If gland sealing is done before vacuum pulling, there may be chances of developing thermal stresses. Gland sealing is charged even before vacuum pulling. Charging the gland seal steam after vacuum pulling may cause cold air shock in the glands which may lead to rotor distortion
Why gland steam is added only after turbine on turning gear?
But why to admit gland steam only after turbine on turning or barring gear is simply because if you apply steam or sealing steam or gland steam (all same) to s stationary rotor, there would be localised heating. This would induce vibrations upon a subsequent start up.