12
2.4 Nominal capacities
For full capacity details for a specific application consult Spirax Sarco. To accurately size
the pump trap, the following data is required.
1.Installation head available, from the base of the pump trap to the centre line of the heat
exchanger / process condensate outlet (metres, feet or inches). If the outlet is mounted
vertically, then this should be from the base of the pump to the face of the outlet.
2. Motive steam pressure available to power the pump trap (bar g or psi g).
3. Total backpressure in the condensate return system (bar g or psi g). See note below.
4. Heat exchanger full-load operating pressure (bar g or psi g).
5. Heat exchanger maximum steam load (kg/h or lb/h).
6. Minimum temperature of secondary fluid. ( °C).
7. Maximum controlled temperature of secondary fluid ( °C or °F).
Model APT14 APT14HC and APT14SHC
Pump discharge/cycle
5 litres
(1.1 gallons)
8 litres
(1.76 gallons)
At:
1 metre installation head
5 bar g motive pressure
1 bar g total
backpressure
Maximum trapping
capacity
4
000 kg/h
(8
820 lb/h)
Maximum trapping
capacity
9
000 kg/h
(19
845 lb/h)
Maximum pumping
capacity
1
100 kg/h
(2
425 lb/h)
Maximum pumping
capacity
2
800 kg/h
(6
174 lb/h)
Note:
The capacities detailed within the above Table are only given as a guide. They are based
on the installation parameters shown in the left hand column.
Achieved capacities will differ if any of the installation parameters change. For specific
capacities and application details, contact Spirax Sarco.
The total lift or backpressure BP (static head plus pressure head in the return system)
must be below the motive fluid inlet pressure to allow pump capacity to be achieved.
BP (backpressure) = (H x 0.098
1 m) + (P) + (Pf)
Height (H) in metres x 0.098
1 plus pressure (P) bar g in the return line, plus downstream
piping friction pressure drop (Pf) in bar.
(Pf can be ignored if the downstream pipework is less than 100 metres to a non-flooded
condensate return and has been sized to take into account the effect of flash steam at the
heat exchanger's full-load operating conditions.)
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