Lesson 3 - Something about sa Pipes

Question 1

caused by internal pressures (static and water hammer) which brings circumferential tension in the pipe walls:

Answer 1

Hydraulic transients

Question 2

A change in the direction or magnitude of flow velocity is accompanied by a change in the momentum of the fluid

Answer 2

Forces at Bends and Changes in Cross Section

Question 3

Longitudinal stresses of considerable magnitude may develop in pipes exposed to large changes in temperature

Answer 3

Temperature Stresses

Question 4

An unsupported pipe acts as a beam with loads resulting from the weight of the pipe, weight of water in the pipe, and any superimposed loads

Answer 4

Flexural Stresses

Question 5

Pipes are often placed in an excavated trench that is backfilled, or they are laid on the ground surface and covered with earth where vertical loads are imposed on the pipe

Answer 5

External Load on Buried Pipes

Question 6

is a graphical representation of the total dynamic head versus the discharge that a pump can supply.

Answer 6

pump head-characteristic curve

Question 7

When two or more pumps are operated, the pump station losses, which are the headlosses associated with the piping into and out of the pump, should subtracted from the ____ curves to derive a modified head characteristic curves.

Answer 7

Manufacturer’s pump