Micron Technology Turbofan - Manual (Page 12)

DRAFT
11
DRAIN LINES MUST BE FITTED. TOTAL BACK PRESSURE OF COMBINED
DRAIN LINES MUST NEVER EXCEED 3 BAR OR MOTOR SEAL FAILURE
WILL RESULT.
b) On all return lines – assume that valves, fittings, etc can cause up to 10 psi (0.7 bar)
back-pressure. Refer to Table 1 to select hose sizes which give a maximum addi-
tional pressure drop of 10 psi (0.7 bar) on any route from a sprayhead to the reservoir.
c) Motor drain lines MUST be returned back to the oil reservoir in an open unrestricted
flow and MUST NOT have more than 75 psi (3.0 bar) total back pressure as the hy-
draulic motor shaft seal may rupture. To check the back pressure place a low pres-
sure gauge in the case drain line on the motor furthest from the oil reservoir and with
the unit running read the pressure. If the pressure is above 75 psi (3.0 bar) the motor
drain line must be replaced with a larger diameter line.
4.2.6 Hoses, Fittings and Motor Connections
All pressure lines must be flexible hydraulic hose or steel hydraulic tube of the appropri-
ate pressure rating.
Any type of hose fitting can be used, but the standard 37 degree JIC flare type is recom-
mended wherever possible. Large radius hose elbows should be used to minimise pres-
sure drops.
High pressure hose should preferably be terminated with swage type fittings. However,
if re-usable types are selected, they should never be re-used more than three times.
IMPORTANT: Never use galvanised water pipe or fittings in any part of an hydraulic
system.
Micron recommend connecting the hydraulic motors of sprayheads in parallel. If con-
nected in series a maximum of two motors in each series chain should be used.
The supply and return connections MUST NOT be reversed as the fan will run in the op-
posite direction with little or no airflow.
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Figure 5. Hydraulic motor connections