Specifications
Enquiry Specification for Wagon Tippler with Side Arm Charger and Associated works
NRO/CON/WT/533
EPI – New Delhi Volume-2B, Rev.0 Page 21 of 63
2) Pumps speed shall be 1500 rpm. Electrical motor pump shall have
25%
reserve power over and above required for operating the
pump
a
t
working pressure and
f
low
.
3) The number of standby pumps shall be as
f
ollows
:
Up to 3 nos. working pumps : 1 no.
s
t
andby
For 4 to 6 nos. working pumps : 2 nos.
s
t
andby
4) The following cleanliness level of oil shall be maintained for
hydraulic sys
t
ems
:
-
Systems without servo valves/ proportional valves:
NAS
.
7
.
Systems with proportional valves:
NAS
.
5
.
Systems with servo valves:
NAS
.
4
.
5) All filters shall have ß ratio ≥ 200. the fineness of various filters
shall
be
as
f
ollows
:
Hydraulic systems without | Pressure line filters :
10micron
proportional and servo valves | C i r c u l a t i o n f i l t e r s : 1 0
micron
Return line filters : 10
micron
6) The capacity of pressure line, circulation filters, return line filters
shall
be
as
f
ollows
:
-
a. Return line
f
il
t
ers
:
3 times of maximum return flow or
3
times of maximum pump flow
which
ever is greater at ∆ p= 0.5 bar
(total)
in
clean
condi
t
ion
.
b. Circulation
f
il
t
ers
:
pump flow at ∆ p= 0.5 bar in
clean condi
t
ion
.
c. Pressure
line
f
il
t
ers
:
2 to 2.5 times pump flow at ∆ p= 0.8
bar
in clean
condi
t
ion
.
All the filters shall be of absolute filtration
design
.
7) Solenoid coil voltage shall be 24 VDC
8) First fill of oil shall be in the bidder scope of
supply
.
The specification of hydraulics as indicated above shall be applicable
f
or
hydraulic drives of wagon tippler, side arm charger, stacker and
bucke
t
wheel
reclaimer
.