The formula, which is most appropriate for the design of pressure pipes is
Darcy-Weisbach formula is used to compute head loss in certain section of a pipe length.
The internal pressure, to which a water supply pipe is subjected to, is
The internal pressure within a pipe is caused by the water head to which the pipe can be subjected and the additional transient pressures. The maximum internal pressure under worst circumstances is sum of full static pressure and the water hammer pressure.
Match the columns most appropriately
Water pipe material
A. Cast iron
Average age of pipe
1. 75 years
2. 100 years
3. 40 years
A B C
(a) 1 2 3
(b) 1 3 2
(c) 3 2 1
(d) 2 3 1
The valve, which allows the flow only in one direction, is a
Check values or Reflux valves: Check valves are sometimes called non-return valves because they prevent water to flow back in the opposite direction. They may be installed on the delivery side of the pumping set, so as to prevent the back flow of stored or pumped water, when the pump is stopped.
The valve, which is provided in the water distributing pipes at street corners and pipe junctions to control the flow in the distribution system, is
Sluice valves are used to regulate the flow of water through the pipes. They are usually placed at the summits.
Scour valves are provided
In order to remove the entire water from within a pipe (after closing the supply), small gated offtakes are provided at low points. These valves are known as blow off valves or drain valves or scour valves. These valves, are necessary at low level points for completely emptying the pipe for inspection, repairs, etc.
Cast iron pipes having plain ends, are joined by a joint, called
This type of a joint is used when it is required to join the plain ends of cast iron pipes. The joints are strong and rigid. They can withstand vibrations and are, therefore, useful for pipes to be carried over bridges or below bridges in hangers.
Consider the following statements:
The basic difference between water pipes and sewer pipes is
1. in the material used for the pipes
2. in the pressure of the liquid flow
3. in the suspended solids they carry
Which of these statements is/are correct?
Cast iron pipes can be used for both-water pipes and sewer pipes. However the basic difference is pressure flow in water pipe and suspended solids carried in sewage.
By using economical diameter of water mains, the benefit obtained is in terms of
If diameter > Economical dia
If diameter < economical dia
High pH value of water in the pipe does not produce
Higher pH means presence of alkali in water which sets at the surface of pipe leading to incrustation, sediment deposits and tuberculation.
However, discharge depends on the volume of water/ sewage carried by pipe in a given time and is independent of pH.