31 Bentone BF1
General
H
H
5.2.4 Suction pipe tables BFP 52E
5.2.4.1 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 66 57 49 41 33 25 16 8
ø 5 mm 100 100 100 100 80 60 40 20
ø 6 mm 100 100 100 100 100 100 83 41
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 66 62 58 54 51 47 43 39
ø 8 mm 100 100 100 100 100 100 100 100
ø 10 mm 100 100 100 100 100 100 100 100
5.2.4.2 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 -0,5 -1,0 -1,5 -2,0 -2,5 -3,0 -3,5 -4,0
ø 6 mm 35 31 27 23 19 15 11 7 3
ø 8 mm 100 98 85 73 60 48 35 23 11
ø 10 mm 100 100 100 100 100 100 86 56 26
The suction line tables consist of theoretically calculated values where the
pipe dimensions and oil velocity have been matched so that turbulences will
not occur.
Such turbulences will result in increased pressure losses and in acoustic noise
in the pipe system. In addition to drawn copper piping a pipe system usually
comprises 4 elbows, a non-return valve, a cut-off valve and an external oil filter.
The sum of these individual resistances is so insignificant that they can be
disregarded. The tables do not include any lengths exceeding 100 m as
experience shows that longer lengths are not needed.
The tables apply to a standard fuel oil of normal commercial quality according
to current standards. On commis sioning with an empty tube system the oil
pump should not be run without oil for more than 5 min. (a condition is that
the pump is being lubricated during operation).
The tables state the total suction line length in metres at a nozzle capacity of 5,0
kg/h and 2,15 mm
2
/s (cSt). Max. permissible pressure at the suction and pressure
side is 2,0 bar.
5.2.4.3 Purging
On 1-pipe systems it is necessary to purge the pump. On 2-pipe systems
purging is automatic through the return line.
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