What is turbine gland sealing?
What is turbine gland sealing?
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.
What is the purpose of seal steam on a turbine?
The seal steam system enables the turbine to be sealed where the shaft exits the casing—in effect keeping “air out and steam in.” Sets of labyrinth packing are used along the turbine rotor where the rotor exits the turbine casing to maintain this pressure differential between the inside and outside.
How does a gland seal work?
The packing is inside the gland nut and creates the seal. The shaft is wrapped by the packing and put in the gland nut. Through tightening it onto the stern tube, the packing is compressed, creating a seal against the shaft. Creating a proper plunger alignment is critical for correct flow and a long wear life.
What is a turbine gland?
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. the portion from where the rotor exists the turbine casing is called a gland .
What happens if we supply a high gland seal pressure for turbine sealing?
The steam turbine gland steam seal system is designed to keep steam from leaking out of the turbine and to prevent air from leaking into the turbine. If too much pressure is present at the labyrinth seal then steam leakage, corrosion and premature wear will be evident. …
What is the purpose of casing sealing glands?
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 …
What material is used in turbine glands?
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.
What is the purpose of a gland seal?
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 steam turbine safety?
The function of the steam turbine protection system is often confused with the control system, but in fact the two systems are entirely separate. The protection system operates only when any of the control system set point parameters are exceeded, and the steam turbine will be damaged if it continues to operate.
How does the steam turbine gland sealing system work?
The leakage of steam or air could occur where the shaft is extended through the turbine endwalls to atmosphere. A power loss is associated with steam leakage or air ingress. Thus, the design of glands and seals is optimized to reduce any leakage. Modern steam turbines use labyrinth glands to restrict steam and air leakage.
What are the functions of glands in turbines?
The two functions of the turbine glands and seals are:1 To prevent or reduce steam leakage between the rotating and stationary components of the turbines if the steam pressure is higher than atmospheric. To prevent or reduce air ingress between the rotating and stationary components of the turbines if the steam pressure is less than atmospheric.
Why do you need a gland sealing system?
To prevent or reduce steam leakage between the rotating and stationary components of the turbines if the steam pressure is higher than atmospheric. To prevent or reduce air ingress between the rotating and stationary components of the turbines if the steam pressure is less than atmospheric.
Why are labyrinth glands used in steam turbines?
Modern steam turbines use labyrinth glands to restrict steam and air leakage. However, the carbon ring gland is still used on some older turbines. The labyrinth gland can withstand higher steam conditions than the carbon ring gland. Figure 9.1 ( a) illustrates a simple form of a labyrinth seal.