CTC Union CTC 380 IC - Function BFP 21 LE-S; Purging

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6. PUMP INSTRUCTIONS
6.1.4 Function BFP 21LE-S
When the pump is started oil is drawn from the suction connection (S)
throughthelter(H)tothegearwheelpump’ssuctionside(C).
From there the oil is conveyed to the pressure side of the gear wheel
pump, where the oil is pressurized. The pressure is controlled and held
constant at a set value by the regulator valve (P
1
) via the membrane (D).
The regulator valve (P
1
) distributes the oil from the gear wheel pump (C)
to the nozzle connection (E) and the pump return side (R).
The amount of oil used is determined by the pressure set at the regulator
valve (P
1
) and by the size of the oil nozzle in the nozzle line.
The valve (P
1
) functions as follows:
- When the oil has reached opening pressure the passage to the
return side opens.
- The membrane and the spring keep the pressure constant at the
pre-set value.
- When the pump is overloaded, i.e. if more oil is demanded from the
gear wheel pump than it is able to deliver under prevailing
circumstances, the oil pressure drops below the set value, where-
upon the valve shuts the return side (R) to the membrane (D) and
reverts to the start position
This can be remedied by:
- Reducing the pump pressure.
- Reducing the amount of oil delivered, i.e. replacement with a smaller
nozzle.
- Replacement with a larger capacity pump.
6.1.5 LE-S System
Note!
The *LE-S pump has an integrated check-valve function at the solenoid
valve, allowing the oil pressure to expand backwards during standstill.
The desired function of avoiding the formation of drops on the nozzle can
only be achieved by using both the LE-S pump and the LE valve built into
the FPHB-LE preheater.
ThesystemisonlyusedontheBFPpumpttedwithasolenoidvalve.
The pumps are given a different designation, e.g. BFP 41L3 LE-S, but do
not differ on the outside from the normal BFP pump.
BFP LE-S pumps cannot be converted into standard pumps, and the
stan-dard BFP pump cannot be converted to the LE-S system.
TheLEvalvemustbettedwhenusingtheLE-Spump.TheLEvalve
may not be excluded unless a BFP standard pump without the LE-S
function is used instead.
The check valve **B allows the oil trapped between solenoid valve NC
and the LE valve in the preheater to expand backwards in the system to
the return port.
The cut-off valve does not cause any extra pressure drop, i.e. at a pump
pressure of 10 bar the spraying pressure will also be 10 bar.
6.1.6 Purging
Purging air is only necessary in single-pipe systems. In two-pipe systems
the pump purges air automatically through the return line.
H
H
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6. PUMP INSTRUCTIONS
6.1.7 Suction pipe tables BFP21LE-S
6.1.7.1 Overhead Tank
One-pipe system
Height m
Line diameters
4,0 3,5 3,0 2,5 2,0 1,5 1,0 0,5
ø 4 mm 51 45 38 32 26 19 13 6
ø 5 mm 100 100 94 78 62 47 31 16
ø 6 mm 100 100 100 100 100 97 65 32
Two-pipe system
Height m
Line diameters
4,0 3,5 3,0 2,5 2,0 1,5 1,0 0,5
ø 6 mm 33 31 29 27 25 23 21 19
ø 8 mm 100 98 91 85 79 72 66 60
ø 10 mm 100 100 100 100 100 100 100 100
6.1.7.2 Underlying Tank
One-pipe system
For reliable operations, use of a Tigerloop is recommended in underlying
tanks.
Two-pipe system
Height m
Line diameters
0 -0,5 -1,0 -1,5 -2,0 -2,5 -3,0 -3,5 -4,0
ø 6 mm 17 15 13 11 9 7 5 3 1
ø 8 mm 53 47 41 34 28 22 15 9 3
ø 10 mm 100 100 99 84 68 53 37 22 6
The suction line tables comprise theoretically calculated values where
pipedimensionsandoilowareadaptedtopreventturbulentowsfrom
occurring.Turbulentowscanresultinpressurelossesandnoisein
the pipework. A typical pipe system usually comprises pipe runs with 4
bends,anon-returnvalve,ashut-offvalveandapre-lter.
The total resistance of these items is such that it can be disregarded. In
the tables no run longer than 100 m is listed, as experience shows this
not to be required.
The tables apply to standard heating oil of normal grade merchantable
according to existing norms. When starting operations with an empty pipe
system, the pump should not be run without oil for more than 5 min. (This
presupposes that the pump is lubricated with oil when running.)
The tables give the total suction line length in meters with a nozzle capacity
of 2.5 kg/h. Max. permissible pressure on the suction and pressure lines
is 2.0 bar.