For A Washout Valve Why Are Two Gate Valves Required In Normal Practice?

For A Washout Valve Why Are Two Gate Valves Required In Normal
Practice?
by

1 Answer

Answer :

Answer :
The washout valves are primarily used for normal maintenance works such as that of water
main. This can be like to allow water to flow out during the cleaning of the water main. The
junctions at which a pipe branches out to a washout point usually a gate valve is installed so
that the two pipelines are separated. The gate valve installed above usually remains open
during normal operation. Another gate valve is installed further downstream and this remains
closed during normal operation of the washout valve.
In case this valve is not installed then the pipe section of the branched out pipe would remain
dry during normal operation and high chances of damage and leakage can take place. When
the downstream valve is installed the branched out water main contains water under normal
operation. With two gate valves installed a leakage can be detected immediately
by

Related questions

Magnetic bearing of a survey line at any place (A) Remains constant (B) Changes systematically (C) Varies differently in different months of the year (D) Is always greater than true bearing

Description : Magnetic bearing of a survey line at any place (A) Remains constant (B) Changes systematically (C) Varies differently in different months of the year (D) Is always greater than true bearing

Last Answer : (C) Varies differently in different months of the year

What Is The Difference Between Absorption & Adsorption And Sorption?

Description : What Is The Difference Between Absorption & Adsorption And Sorption?

Last Answer : Answer : Absorption generally refers to two phenomena, which are largely unrelated. In one case, it refers to when atoms, molecules, or ions enter some bulk phase - gas, liquid or solid material ... different from absorption, in which a substance diffuses into a liquid or solid to form a solution.

How Do You Measure Concrete?

Description : How Do You Measure Concrete?

Last Answer : Cubic feet, Cubic yards, Cubic Meter.

Which Is Stronger Solid Steel Rod Or Hollow Steel Pipe?

Description : Which Is Stronger Solid Steel Rod Or Hollow Steel Pipe?

Last Answer : Answer :On a per pound basis, steel pipe is stronger in bending and is less likely to buckle in axial compression.

What Is The Tallest Man Made Structure In The World?

Description : What Is The Tallest Man Made Structure In The World?

Last Answer : Answer : The tallest man made structure is the KVLY-TV mast which is 2063 feet tall. The worlds tallest man made structure is Burj Dubai which is 800 meter tall.

What Are The Uses Of Alloys In Daily Life And How Are Alloys Made?

Description : What Are The Uses Of Alloys In Daily Life And How Are Alloys Made?

Last Answer : Answer : Alloying is not always done to produce a superior' material, but to produce materials having a desired requirement in the industry or elsewhere. A classic case is of lead solder (containing ... proportions to the molten base metal (e.g., in production of different types of steel).

What Is The Worlds Largest Concrete Dam?

Description : What Is The Worlds Largest Concrete Dam?

Last Answer : Answer : The Grand Coulee Dam is said to be the largest concrete dam. Currently the world's largest concrete dam is the Itaipu Dam, an accomplishment of two neighboring countries, Brazil and Paraguay ... River in China will take over as the largest upon its completion, which is slated for 2009.

What Is Braced Excavation All About?

Description : What Is Braced Excavation All About?

Last Answer : Answer : Excavations are braced to prevent the cave-in of surrounding unstable soil.

What Is The Meaning Of Soil Reinforcement?

Description : What Is The Meaning Of Soil Reinforcement?

Last Answer : Answer : Soil reinforcement is the act of improving soil strength to enable it support or carry more load. Two common examples are:  Mixing a soil amendment such as lime into weak ... a stronger sloped soil structure (often done on steep roadway embankments to improve strength and stability)

What Is Aggregate?

Description : What Is Aggregate?

Last Answer : Answer : Aggregate is the component of a composite material used to resist compressive stress.

How Are Freeway Bridges Built?

Description : How Are Freeway Bridges Built?

Last Answer : Answer : After calculating the anticipated traffic for the bridge, cement/reinforced- with- rebar stanchions are spaced over the freeway to accommodate the bridge. An off-ramp' from the freeway ... bridge deck can be reinforced concrete, structural steel, or a combination of steel and concrete.

. What Is The Difference Between Routing Maintenance And Major Maintenance In School Facilities?

Description : . What Is The Difference Between Routing Maintenance And Major Maintenance In School Facilities?

Last Answer : Answer : The routine maintenance is the minor and consistent repairs that are engaged in the school premises. Examples could include painting, replacement of fixtures, louver blades, furniture repairs, ... . It could be total restructuring of the lighting system in the school or sanitary system.

What Is Difference Between Engineering Stress And True Stress?

Description : What Is Difference Between Engineering Stress And True Stress?

Last Answer : Answer : Think about pulling a bar in tension. Load divided by cross-sectional area is force, or stress. But what cross section are you considering? Before starting pull, the bar had a ... to the initial diameter of the circle. The relationships between engineering values and true values are:

Discuss Some Applications Of Modular Elasticity?

Description : Discuss Some Applications Of Modular Elasticity?

Last Answer : Answer : As the term implies, Modulus of Elasticity relates to the elasticity or flexibility of a material. The value of modulus of elasticity is very much significant relating to deflection of ... about 70 GPA for aluminum. This simply translate that aluminum is 3 times flexible than steel.

What Is Modular Elasticity?

Description : What Is Modular Elasticity?

Last Answer : Answer : Young’s modulus (E) describes tensile elasticity, or the tendency of an object to deform along an axis when opposing forces are applied along that axis; it is defined as the ratio of tensile stress to tensile strain. It is often referred to simply as the elastic modulus.

How Can You Distinguish Between Sorption, Absorption And Adsorption?

Description : How Can You Distinguish Between Sorption, Absorption And Adsorption?

Last Answer : Answer : Sorption is a concomitant phenomenon of adsorption and absorption. Adsorption describes the phenomenon in which molecules that are present in a fluid (liquid or gas), concentrated spontaneously on a solid surface by a finite time.

What Are The Different Approaches In Designing The Floors Of The Service Reservoirs?

Description : What Are The Different Approaches In Designing The Floors Of The Service Reservoirs?

Last Answer : Answer : In general there are two main approaches of designing the reservoir floors to prevent leakage of water due to seasonal and shrinkage movements:  In this approach the movement joints of the ... in this method is that the amount of reinforcement used is much more than the first approach

In Block Work Seawalls What Is The Purpose Of Slip Joints?

Description : In Block Work Seawalls What Is The Purpose Of Slip Joints?

Last Answer : Joints which are formed from the cope level to the toe level of seawalls through a complete vertical plane are known as slip joints. Such joints are designed so as to handle the differential ... panels in one unit against the earth pressure ( lateral ) which is exerted on the seawalls.

In Reclamation Works What Are The Importance Of Geotextiles And Sand?

Description : In Reclamation Works What Are The Importance Of Geotextiles And Sand?

Last Answer : Answer : The primary purposes of geotextiles and sand in reclamation works are as follows:  Geotextiles: They are used to separate the marine mud from the reclamation fill. Also geotextiles are used ... . Sand also acts as a drainage for the excess pore water pressure of band drain installations.

During Reclamation How Can The Occurrence Of Mud Waves Can Be Rectified?

Description : During Reclamation How Can The Occurrence Of Mud Waves Can Be Rectified?

Last Answer : Answer : There are several solution to the rectification of the problem of mud waves:  Complete removal of all the disturbed mud: This method can be considered to be one of the fastest ... methods where the top layer is removed whereas the lower level is treated with the surcharging process.

n The Roof Of A Pumping Station Explain Briefly The Components Of A Waterproofing System?

Description : n The Roof Of A Pumping Station Explain Briefly The Components Of A Waterproofing System?

Last Answer : Answer : The components of a typical waterproofing system on the roof of a pumping station are as follows:  Right above the structural finish level of the roof ( concrete ) a uniform ... waterproof membrane. The insulation board helps in the maintenance of a stable temperature in both weathers.

Why Are Separation Membranes Used Between Concrete Pavement Slab And Sub-base?

Description : Why Are Separation Membranes Used Between Concrete Pavement Slab And Sub-base?

Last Answer : Answer : The purpose of separation membrane between the concrete pavement slab and the sub-base are as follows:  The separation membrane reduces the frictional forces between the concrete slabs and ... of it. A good example of a separation membranes is polythene sheeting which is commonly used.

Why Is The Use Of Granular Sub-base In Concrete Carriageways Not Preferred, Explain?

Description : Why Is The Use Of Granular Sub-base In Concrete Carriageways Not Preferred, Explain?

Last Answer : Answer : Some of the reasons why granular sub-base is not preferred in concrete carriageways:  Sub bases are permeable and hence water can seep through them easily. The soil particles get pumped ... sub-base. This can lead to the cracking of the carriageway when there is severe traffic loading.

Explain Why Concrete Barriers Have Curved Surface Profiles?

Description : Explain Why Concrete Barriers Have Curved Surface Profiles?

Last Answer : Answer : The concrete safety fencings are made to contain vehicles in their carriageway being travelled so as to reduce the chances of rebounding into the roads leading to more hazards. In the case ... on the road by rebounds. This helps in vastly reducing the chances of other vehicle hazards.

Describe Briefly The Advantages And Disadvantages Of Using Plastic And Timber Fenders?

Description : Describe Briefly The Advantages And Disadvantages Of Using Plastic And Timber Fenders?

Last Answer : Answer : The advantages and disadvantages of using plastic fenders are as follows: Plastic fenders are low in strength with a relatively high resistance to abrasion. Plastic fenders are resistant ... of contact. Also since they are made from recycled material they are environmental friendly.

Why Are Pull-out Tests Performed For Soil Nails?

Description : Why Are Pull-out Tests Performed For Soil Nails?

Last Answer : Answer : Pull out tests are performed for primarily the following reasons: In order to detect and the verification of the bond strength among the soil and the grout adopted during the design of soil ... should always be loaded so that the ultimate soil/grout mixture with an upper limit of 80%.

For What Purpose Bedding Is Used Under Storm Water Drains, Explain?

Description : For What Purpose Bedding Is Used Under Storm Water Drains, Explain?

Last Answer : Answer : Beddings are primarily made up of granular or concrete materials. They are primarily used for the following purposes:  They are used to provide a more uniform support for the under ... sockets. Otherwise it can lead to uneven stress being induced on the pipes eventually damaging it.

Explain The Mechanism Of Cavitations In Pipes And Drains?

Description : Explain The Mechanism Of Cavitations In Pipes And Drains?

Last Answer : Answer : The formation of air bubbles in a fluid due to low pressure conditions lower than the saturation pressure is known as cavitations. This is considered to be a high potential damage condition ... This leads to the damage of the pipelines as a high level of dynamic pressure is created.

What Are The Different Type Of Slump Test Indications?

Description : What Are The Different Type Of Slump Test Indications?

Last Answer : Answer : Slump tests are performed to empirically measure the work ability of fresh concrete. It is used to measure the consistency of the concrete. In general there are three different types of slumps that ... the mix of concrete is simply too wet. The mix is considered to be harsh and lean.

Why Should Curing Not Be Done By Ponding And Polythene Sheets?

Description : Why Should Curing Not Be Done By Ponding And Polythene Sheets?

Last Answer : Answer : The primary purpose of curing is to reduce the heat loss of concrete that is freshly placed to the atmosphere and in order to reduce the temperature gradient across the cross-section of ... be easily blown away by winds and also the water lost by self-desiccation cannot be replenished.

Why Should Pumping Be Not Used In Case Of Concreting Works?

Description : Why Should Pumping Be Not Used In Case Of Concreting Works?

Last Answer : Answer : During the pumping operation the pump exerted pressure must overcome any friction between the pumping pipes and the concrete, also the weight of the concrete and the pressure headwhen the ... Also if a proper selection of the aggregate grading can vastly improve the concrete pump ability.

Under What Circumstances Should Pot Bearings Be Used Instead Of Elastomeric Bearings?

Description : Under What Circumstances Should Pot Bearings Be Used Instead Of Elastomeric Bearings?

Last Answer : Answer : Pot bearings are preferred over elastomeric bearings in situations where there are chances of high vertical loads in combinations of very large angle of rotations. Elastomeric bearings always ... Due to the above reasons pot bearings are preferred over elastomeric bearings in such cases.

In Case If Concrete Box Girder Bridges How Is The Number Of Cells Determined?

Description : In Case If Concrete Box Girder Bridges How Is The Number Of Cells Determined?

Last Answer : Answer : When the depth of a box girder bridge exceed 1/6th or 1/5th of the bridge width then the design recommended is that of a single cell box girder bridge. But in case the depth of ... the transverse load distribution when the number of cells of the box girder is higher than three or more.

. In The Design Of Bridge Arguments What Considerations Should Be Made To Select The Orientation Of The Wing Walls?

Description : . In The Design Of Bridge Arguments What Considerations Should Be Made To Select The Orientation Of The Wing Walls?

Last Answer : Some of the most common arrangements of wing walls in cases of bridge arguments are as follows:  Wing walls parallel to abutments: This method is considered to take least amount of time to ... design is it provides an alignment continuous with the bridge decks lending a support to the parapets.

What Reinforcements Are Used In The Process Of Prestressing?

Description : What Reinforcements Are Used In The Process Of Prestressing?

Last Answer : Answer : The major types of reinforcements used in prestressing are:  Spalling Reinforcement: The spalling stresses leads to stress behind the loaded area of the anchor blocks. This results in the ... of load. In order to reduce such stresses reinforcements in the form of bursting is required.

Why Are Steel Plates Inserted Inside Bearings In Elastomeric Bearings?

Description : Why Are Steel Plates Inserted Inside Bearings In Elastomeric Bearings?

Last Answer : Answer : In order to make a elastomeric bearing act/ function as a soft spring it should be made to allow it to bulge laterally and also the stiffness compression can be increased by simply ... plates. But the presence of the metal plates does not affect the shear stiffness of the bearings.

What Do You Understand By “preset” During The Installation Process Of Bridge Bearings?

Description : What Do You Understand By “preset” During The Installation Process Of Bridge Bearings?

Last Answer : Answer : During the installation of bridge bearings the size of the upper plates is reduced to save the material costs. This process is known as preset. Generally the upper bearing plate comprises of ... to the length of the length of the bearing + irreversible movement + 2 x reversible movement

Describe Briefly The Various Methods Of Concrete Curing?

Description : Describe Briefly The Various Methods Of Concrete Curing?

Last Answer : Answer : Curing is the process of maintaining the moisture and temperature conditions for freshly deployed concrete. This is done for small duration of time to allow the hardening of concrete. The methods that ... can be applied on curing surface. This keeps the surface wet for a very long time.

What Are The Steps Involved In The Concreting Process, Explain?

Description : What Are The Steps Involved In The Concreting Process, Explain?

Last Answer : Answer : 1. Batching: The process of measurement of the different materials for the making of concrete is known as batching. batching is usually done in two ways: volume batching and weight batching ... performed. Compaction is generally performed in two ways: by hand or by the use of vibrators.

GATE 2020 syllabus electrical engineering

Description : GATE 2020 syllabus electrical engineering

Last Answer : EE: Electrical Engineering Section 1: Engineering Mathematics Linear Algebra: Matrix Algebra, Systems of linear equations, Eigenvalues, Eigenvectors. Calculus: Mean value theorems, Theorems of ... to dc converters, Single phase and three phase inverters, Sinusoidal pulse width modulation.

Which of the following valves will incur maximum pressure drop for the same discharge of water? (A) Globe valve (B) Gate valve (C) Needle valve (D) Butterfly valve

Description : Which of the following valves will incur maximum pressure drop for the same discharge of water? (A) Globe valve (B) Gate valve (C) Needle valve (D) Butterfly valve

Last Answer : (C) Needle valve

Do people seem more meanier and nastier today in general?

Description : Do people seem more meanier and nastier today in general?

Last Answer : Not at all. I think a lot of this comes from the fact that we’re transitioning, in many ways, from a single-voiced society to a truly democratic one. But as I’ve grown, I’ve found people generally more and more courteous.

What are types of gate valves?

Description : What are types of gate valves?

Last Answer : Answer: Solid plane wedge, solid flexible wedge, split wedge, double disc parallels seats, double disc wedge, single disc single seat gate or slide, single disc parallel seats, plug gate valve.

What are port types for gate valves?

Description : What are port types for gate valves?

Last Answer : Answer: Full port and reduced port. Default is reduced bore. Full port has to be specified in bom.

Detailed energy auditing is carried out in _______phases a. One b. Two c. Three d. Four

Description : Detailed energy auditing is carried out in _______phases a. One b. Two c. Three d. Four

Last Answer : Ans:- c. Three

Explain construction and working of two stage reciprocating air compressors.

Description : Explain construction and working of two stage reciprocating air compressors.

Last Answer : Figure: Two Stage Reciprocating air compressor Construction and Working : It consists of two cylinders (L.P. and H.P.) with water cooled intercooler and air receiver. First of all fresh air is ... (ie second stage) from 3 to 4 is delivered by the compressor at pressure P3 & Temp T4.

Explain two pass down flow surface condenser with a neat sketch.

Description : Explain two pass down flow surface condenser with a neat sketch.

Last Answer : Two pass down flow surface condenser: It consists of horizontal cast iron cylindrical vessel pack with tubes, through which the cooling water flows. The ends of the condenser are cut off by vertical ... convert into water; therefore whole condensate can be the reused in the boiler. 

5) An iron ring of mean circumference of 80 cm is uniformly wound with 500 turns of wire. Calculate the value of flux density that a current of 1 A would produce in the ring. Assume relative permeability 1400.

Description : Please ripley me due to emergency

Last Answer : To calculate the flux density in the ring, you need to use the following formula: B = (μ * I * N) / (2 * π * r) where: B is the flux density in the ring (in teslas) μ is the relative permeability ... 2 * π * 0.127 m) = 0.53 T So the flux density in the ring would be approximately 0.53 teslas.

What is the difference between manual and automatic feed during turning

Description : Is not asked

Last Answer : In manual feed turning, the operator manually controls the feed rate of the cutting tool by turning a handwheel or other manual feed mechanism. This allows the operator to adjust the feed rate ... hand, is generally faster and more consistent, but it requires more complex equipment and programming.

Can a Schizophrenic study Engineering?

Description : Can a Schizophrenic study Engineering?

Last Answer : You can ask the university’s disability counselor. You might get an accommodation as a special student or take fewer classes, and go part time. Congratulations on improving your situation.