State the effect of Water hammering effect in penstock of HPS and method to reduce it.

State the effect of Water hammering effect in penstock of HPS and method to reduce it. 
by

1 Answer

Answer :

Water hammering effect in penstock of HPS:

When load on power plant or alternator decreases then Governor (valve) reduces discharge of water. Due to sudden reduction in water discharge causes increase in pressure of the water in the penstock. Due to high pressure penstock may damage. This effect is known as ‘Water hammer effect’. 

OR

When load on power plant or alternator decreases then Governor (valve) reduces discharge of water. Due to sudden reduction in water discharge causes increase in pressure in the penstock. Due to high pressure penstock may damage. This effect is known as ‘Water hammer effect. 


Method of Water hammering Effect is reduced: -  

With the help of surge tank water hammer effect is eliminated OR At that time surge tank helps by storing this rejected water immediately. In this way it avoids water hammer effect. 

by

Related questions

What is penstock? What is its function?

Description : What is penstock? What is its function?

Last Answer : What is Penstock:- The penstock is the long pipe line. It consists of heavy duty steel pipe.  Function of Penstock:- Function of penstock is to carry water from the water intake (reservoir) to turbine.

What are the main electrical equipment used in HPS ? State the function of each parts of it in brief.

Description : What are the main electrical equipment used in HPS ? State the function of each parts of it in brief. 

Last Answer : Following Main Electrical Equipment used in HPS & their function: 1. Alternator 2. Exciter 3. Transformer 4. Switchgear   Function :  1) Alternator:- Alternator is coupled to ... part from the healthy section. It contains circuit breaker, relays, switches and other control devices.  

Water hamming effect is occurs in a) Surge tank b) Penstock c) Turbine d) Reservoir

Description : Water hamming effect is occurs in a) Surge tank b) Penstock c) Turbine d) Reservoir

Last Answer : Ans: Penstock

Name the turbines used in HPS. For the heads 30 M and less and 200 M and above.

Description : Name the turbines used in HPS. For the heads 30 M and less and 200 M and above.

Last Answer : For the heads 30 M and less :  1. Multi jet pelton wheel 2. Cross flow turbine 3. Turgo turbine 4. Francis turbine 5. Overshot Water Wheel 6. Pitch back Water Wheel  For the heads 200 M and above:-  1. Francis turbine 2. Pelton wheel turbine

The method of magnetization is: (1) hammering a magnet (2) heating a magnet (3) passing direct current through it (4) passing alternating current through it

Description : The method of magnetization is: (1) hammering a magnet (2) heating a magnet (3) passing direct current through it (4) passing alternating current through it

Last Answer : (1) hammering a magnet Explanation: Hammering a rod will either allow it to become slightly magnetic inlaid along a magnetic field (i.e.North - South) or demagnetize it if laid across the field lines (i.e. East-West). A current passing through a coil will produce a magnetic field.

The method of magnetisation is: (1) hammering a magnet (2) heating a magnet (3) passing direct current through it (4) passing alternating current through it

Description : The method of magnetisation is: (1) hammering a magnet (2) heating a magnet (3) passing direct current through it (4) passing alternating current through it

Last Answer :  hammering a magnet

Which of the following is TPS variety of Potato ? (A) JH 222 (B) Chipsona-II (C) Anand (D) HPS-1/113

Description : Which of the following is TPS variety of Potato ? (A) JH 222 (B) Chipsona-II (C) Anand (D) HPS-1/113

Last Answer : (D) HPS-1/113

What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir? (A) Penstock (B) Siphon (C) Tunnel (D) Pressure pipeline

Description : What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir? (A) Penstock (B) Siphon (C) Tunnel (D) Pressure pipeline

Last Answer : (B) Siphon

In a pressure penstock 4500 m long, water is flowing at a velocity of 4 m/s. If the velocity of the pressure wave traveling in the pipe, due sudden complete closure of a valve at the downstream end, is given as 1500 m/s, what would be the period of oscillation in second under frictionless conditions? (a) 6 (b) 8 (c) 9 (d) 11

Description : In a pressure penstock 4500 m long, water is flowing at a velocity of 4 m/s. If the velocity of the pressure wave traveling in the pipe, due sudden complete closure of a valve at the downstream end, is ... period of oscillation in second under frictionless conditions? (a) 6 (b) 8 (c) 9 (d) 11

Last Answer : (a) 6

What nails do carpenters hate hammering?

Description : What nails do carpenters hate hammering?

Last Answer : Fingernails

Explain about penstock?

Description : Explain about penstock?

Last Answer : The pipe between surge tank and prime mover is known as penstock. It is designed to withstand high pressure. It is made up of reinforced concrete. In very cold areas, the penstock is buried to prevent ice formation and to reduce the expansion joints.

Hard peening is a) Hammering the weld across the length while the joint is hot b) Hammering the weld along the length while the joint is hot c) Hammering the weld along the length while the joint is cold d) Hammering the weld across the length while the joint is cold

Description : Hard peening is a) Hammering the weld across the length while the joint is hot b) Hammering the weld along the length while the joint is hot c) Hammering the weld along the length while the joint is cold d) Hammering the weld across the length while the joint is cold

Last Answer : b) Hammering the weld along the length while the joint is hot

The ability of a material to be formed by hammering or rolling is known as _________ a) Malleability b) Ductility c) Harness d) Brittleness

Description : The ability of a material to be formed by hammering or rolling is known as _________ a) Malleability b) Ductility c) Harness d) Brittleness

Last Answer : a) Malleability

Powder metallurgy process does not make metal powder by (A) Atomisation (B) Grinding/milling (C) Hammering (D) Electrolytic deposition

Description : Powder metallurgy process does not make metal powder by (A) Atomisation (B) Grinding/milling (C) Hammering (D) Electrolytic deposition

Last Answer : Option C

Explain about penstock?

Description : Explain about penstock?

Last Answer : The pipe between surge tank and prime mover is known as penstock. It is designed to withstand high pressure. It is made up of reinforced concrete. In very cold areas, the penstock is buried to prevent ice formation and to reduce the expansion joints.

Explain About Penstock?

Description : Explain About Penstock?

Last Answer : The pipe between surge tank and prime mover is known as penstock. It is designed to withstand high pressure. It is made up of reinforced concrete. In very cold areas, the penstock is buried to prevent ice formation and to reduce the expansion joints.

The following operation is not carried out by an plough a) sowing seeds b) breaking the clods c) crushing the soil d) hammering the soil

Description : The following operation is not carried out by an plough a) sowing seeds b) breaking the clods c) crushing the soil d) hammering the soil

Last Answer : sowing seeds

What do you understand by the term Dark Fermentation'? (1) It is a method to dispose nu-clear wastes. (2) It is a method to produce methane from organic wastes. (3) It is a method to reduce COD in the atmosphere. (4) It is a method to produce Hydrogen as a fuel from waste water.

Description : What do you understand by the term Dark Fermentation'? (1) It is a method to dispose nu-clear wastes. (2) It is a method to produce methane from organic wastes. (3) It is a method to reduce COD in the atmosphere. (4) It is a method to produce Hydrogen as a fuel from waste water.

Last Answer : (4) It is a method to produce Hydrogen as a fuel from waste water. Explanation: Dark fermentation is the fermentative conversion of organic substrate to bio-hydrogen. It is a complex ... . Wastewater is used as a potential substrate for bio-hydrogen production in the dark fermentation process.

The method of alighting the aeroplane on water during a ditching is to: a. Carry out a normal approach with flaps and gear selected as normal but to calculate all speeds plus 10kts b. Reduce the approach angle to 1.5deg (150ft/mile), add 15kts to all speeds, keep the aeroplane clean (no flaps or gear) and fly it into the surface c. Fly a normal approach but keep the gear up and land at lowest possible speed with the nose raised for the tail to strike first d. Fly a normal approach to stalling speed and then drop the aeroplane vertically onto the water

Description : The method of alighting the aeroplane on water during a ditching is to: a. Carry out a normal approach with flaps and gear selected as normal but to calculate all speeds plus 10kts b. Reduce ... d. Fly a normal approach to stalling speed and then drop the aeroplane vertically onto the water

Last Answer : c. Fly a normal approach but keep the gear up and land at lowest possible speed with the nose raised for the tail to strike first

What do you understand by the term ‘Dark Fermentation’? (1) It is a method to dispose nuclear wastes. (2) It is a method to produce methane from organic wastes. (3) It is a method to reduce COD in the atmosphere. (4) It is a method to produce Hydrogen as a fuel from waste water.

Description : What do you understand by the term ‘Dark Fermentation’? (1) It is a method to dispose nuclear wastes. (2) It is a method to produce methane from organic wastes. (3) It is a method to reduce COD in the atmosphere. (4) It is a method to produce Hydrogen as a fuel from waste water.

Last Answer :  It is a method to produce Hydrogen as a fuel from waste water.