Your CPD: Questions - pressure drops and pipe fittings

1. What typical percentage is used as a rule of thumb for fittings to allow for pressure drop?

a 10%

b 20%

c 30%

d 40%

2. What other method can be used to allow for frictional losses?

a Added Pascals method

b Equivalent lengths method

c Equivalent Pascals method

d Added lengths method

3. Where would you use a zeta value?

a Calculating hydraulic resistance of fittings

b Calculating the volume of a heating system

c Calculating the pressure of an expansion vessel

d Calculating the hydraulic resistance of a feed and expansion cistern

4. With which of the following do we measure resistance to flow? (Choose 2)

a Pascals

b Litres/second

c Metres head per metre

d Newtons

5. The formula for calculating velocity through a pipe at a given flow rate is?

a V = Q / A

b V = Q x A

c Q = A x V

d Q = A / V

6. Using the nomograph below, what is the pressure drop of an elbow with a zeta value of 0.5 and a flow velocity of 1.0m/s?

a 220 Pa

b 230 Pa

c 240 Pa

d 250 Pa

Answer the above questions and send your answers, along with your name, membership number and email address, to:

CPD Assessment, CIPHE
64 Station Lane
RM12 6NB,

or visit the members-only area of the CIPHE website:

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