22
20039847GB
8.1.1. Oil Pump Pressure Regulation
1-stage burners
Fit a pressure gauge in the connection (see chapter ”Oil Pumps”). Adjust the oil pressure by
turning the pressure regulating screw. The pressure increases by turning the screw clockwise
and decreases counter-clockwise.
When the pressure is altered the oil flow and pressure follow the following formula:
V1
V2
P1
P2
=
V1
=
capacity marked on the nozzle
V2
=
nozzle capacity at a pressure of P2
P1
=
7 bar gives USgal/h
10 bar gives kg/h according to CEN-standard
P2
=
pressure to be used
Calculation example according to CEN-standard.
Nozzle capacity when the nozzle size is 11 kg/h and pressure 13 bar.
kg/h
12,5
=
1,14
kg/h
11
bar
10
bar
13
kg/h
11
P1
P2
V1
V2
P2
P1
V2
V1
×
=
×
=
×
=
=>
=
2-stage burners
The oil pump gives two different pressures to the nozzle. Changing the nozzle pressures by
means of the pressure regulating screw regulates the pump’s capacities 1 and 2. Capacity 1
must be 55 - 70 % of the calculated capacity.
Design values for nozzle pressures: stage 1: 8 - 10 bar
stage 2: 20 - 25 bar
When adjusting the oil pressures, note that the burner capacity must remain on the capacity
range indicated on the type plate.
Calculation example according to CEN-standard.
Nozzle for a boiler of 100 kW with an efficiency of 0,80 and pressure to be used for stage 2 is
21 bar.
nozzle kg / h =
100
11,86 0,80 1,45
= 7,27 kg / h
×
×
=> select nozzle of 7,10 kg/h
Capacity 2, which can be reached by the nozzle at a pressure of 21 bar:
7,10 kg / h =
21 bar
10 bar
= 10,3 kg / h
Capacity 1 must be 55 - 70 % (0,55 - 0,70) of the calculated capacity of the nozzle:
10,3 kg/h x 0,63 = 6,49 kg/h
Nozzle pressure of capacity 1 is thus:
( )
( )
(
)
(
)
bar
8,4
=
h
/
kg
10
,
7
kg/h
6,49
bar
10
=
P2
V1
V2
P1
=
P2
P2
P1
=
V2
V1
P2
P1
=
V2
V1
2
2
2
2
2
2
×
×
=>
=>
The pressure of capacity 1 must be at least 7 bar.
Содержание KP-6
Страница 7: ...5 20039847GB 3 3 Basic Assembly Drawing...
