6.1.33

How to size and select

Sizing and selection

Condensate pumps

Mechanical pumps and pumps traps

Recommended installation

The pump is fitted with a vented receiver or an inlet reservoir.

Details of the application will determine whether a vented receiver or an inlet reservoir will be needed

to accomplish this.

Check valve

to help reduce

the likelihood

of backflow and

waterhammer

Condensate

return

line

Height

At least 304 mm (12")

seal on the overflow.

Discharge to be piped

to safe location

Pump

exhaust

such that there

is no risk to

personnel.

Solution:

Filling

height

Condensate load

Steam pressure available for operating pump

Vertical lift from pump to the return piping

Pressure in the return piping (piping friction negligible)

Filling head on the pump available

9 545 kg/h

5.5 bar g

9.1 m

1.7 bar g

610 mm

(21000 lb/h)

(80 psi g)

(30 feet)

(25 psi g)

(24")

Condensate

outlet

Vented receiver

Vent to atmosphere.

To be piped to a safe

location such that there

is no risk to personnel

Motive steam

or gas supply

Strainer

TD

Min. 304 mm (12")

above the

vent assist

valve

PTF4

From the inlet pressure, backpressure and filling head conditions given below, select the pump size and check valve package which meets

the capacity requirement of the application.

Specify pump body - Type PTF4. Select optional extras as required.

For kg/h, multiply the capacities below by 0.454 (For gpm, multiply the capacities below by 0.002).

Backpressure in bar g = lift height (H) in metres divided by 10 plus the pressure in the return line (Backpressure in psi g = lift height (H) in

feet x 0.433 plus the pressure in the return line). Added to this is the downstream piping friction pressure drop in bar g (psi g) calculated and

based on the maximum instantaneous discharge rate of the respective pump selected - See TI sheets.

Note: To achieve rated capacity, the pump must be installed with check valves supplied by Spirax Sarco. Use of a substitute

check valve may affect the performance of the pump.

Capacity lb/h when installed with the recommended filling head above the top of the pump.

1. Calculate 'H', the total lift or backpressure, against which the condensate must be pumped:

'H' Metric = (9.1 m / 10) + 1.7 bar g = 2.6 bar g

'H' Imperial = (30 feet x 0.433) + 25 psi g = 38 psi g)

2. From the capacity table, given an inlet pressure of 5.5 bar g (80 psi g) and a backpressure of 2.8 bar g (40 psi g),

choose a PTF4 pump with stainless steel check valves, which has a capacity of 12 264 kg / h (26 980 lb / h).

Note from capacity multiplying factor charts:

A. If filling head were 457 mm (18") PTF4 pump capacity would be: = 0.98 x 12 264 kg/h (26 980 lb/h) = 12 018 kg/h (26 441 lb/h)

B. Pump capacity using compressed air would be (% backpressure is 5.5 to 2.6 bar g (38 to 80 psi g) = 47% e.g. use 50%):

= 1.85 x 12 264 kg/h (26 980 lb/h) = 22 688 kg/h (49 914 lb/h).

Intended use

This product fully complies with the requirements of the European Pressure Equipment Directive 97/23/EC and is certified for use to

Category III within Group 2 Gases and to SEP for Group 2 liquids. The product carries the CE mark when so required. This product is

designed and built to the pressure vessel code ASME section VIII Division 1.

TI-P135-13 ST Issue 2

PTF4 Pivotrol

®

Pump (patented) Dual Mechanism - Pressure Powered Pump

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