Questions

14.3 Sizing Condensate Return Lines

1 As a simple rule, what can condensate drain lines be sized on?
a) The plant outlet connection
b) The plant steam inlet connection
c) The trap inlet connection with the correct sized trap
d) It is unimportant to size drain lines correctly
2 For steam mains and constant pressure processes, how is start load estimated?
a) Twice the running load at the rated pressure
b) Three times the running load at a third of the rated pressure
c) Ten times the running load at half the rated pressure
d) The running load at twice the rated pressure
3 On which pressure loss should drain lines be sized?
a) 100 Pa/m
b) They need only be sized on velocity
c) 200 Pa/m
d) 200 Pa/m for lines less than 10 m and 100 Pa/m for lines over 10 m
4 What is the major factor that influences the size of the trap discharge lines?
a) The size of the trap
b) The size of the drain line
c) The amount of flash steam produced in the discharge line
d) The amount of condensate flowing
5 Using Appendix 14.3.1, which size of drain line 1.5 m long should be chosen for a constant pressure process with a running load of 450 kg/h?
a) 20 mm
b) 32 mm
c) 25 mm
d) 15 mm
6 Three discharge lines 25 mm, 50 mm, 65 mm are to branch into a common line discharging into a vented receiver. What should be the size of the common line into the receiver?
a) 100 mm
b) 80 mm
c) 65 mm
d) 50 mm