Document No:
Chapter –8 Fuel & Lubricants
Version No: 1.0-d0
Date Issued: dd/mm/yyyy
Document Title: MANUAL MAINTENANCE FOR DIESEL LOCOMOTIVES
Revised 2013
Printed: 2015/03/08
Page 152 of 303
8.3.3
Bottom Unloading:
8.3.3.1
The number of decanting pumps to be provided depends upon the numbers of
tank wagons required to be unloaded at any one time. The decanting points with
suction line connections should be located along side the unloading track
properly spaced, depending on the length of the tank wagons and at standard
clearance from the track. The connection should be of 75-100 mm size
depending upon the capacity of the unloading pump. Arrangement should be
provided to isolate any of the connections, if so required. The area around the
decanting points should be properly paved, so that it is easy to keep it clean.
8.3.3.2
The hose should be of adequate length and be of an oil resistant material. It
should conform to Indian Standard Specification. It is preferable to ensure that
the delivery hose ends do not drop on the ground when not in use and are
suitably protected from rain and dust. This could be achieved by having a stand
on which the hose could be hung. If the hose is of a length which makes it
difficult to be hung on a stand, an open metal trough for the hose to be stored
when not in use, is recommended. A cover should be provided for the metal
trough or detachable cover may be arranged for the hose ends to prevent ingress
of dirt and other foreign particles into the hose when not in use. It is necessary
that the oil remaining in decanting hose pipes is collected in drums and utilized,
as otherwise there is likely to be pilferage or wastage.
8.3.4 Dome Unloading:
8.3.4.1
Dome unloading is usually handled by means of overhead fixtures. These
fixtures usually consist of a riser pipe from the suction line with a swing joint at
top, an extension arm that normally stands horizontal but which can be pulled
down and across to the dome of the tank wagon, and a light weight non-ferrous
metal drop pipe of sufficient length which can be lowered into the tank wagon
to serve as the suction pipe for drawing in fuel from the tank wagon. The riser
pipe should be slightly higher than the height of the tank wagon and should be
properly secured at the bottom in a concrete base pedestal. A valve in the riser
pipe and a strainer at the end of drop pipe are also provided. The swing joint is
fitted with ball bearings with sealed in lubricant and non leaking ring seals.
Figure 8.1 illustrates this type of fuel oil unloading arrangement.
8.3.4.2
It is good practice to provide a push button start-stop switch at a central
convenient point in the unloading area for starting and stopping of fuel
unloading pumps. The provision of green and red electric light visual indicators
helps in ensuring proper functioning of the unloading arrangements when large
quantities of diesel fuel are to be handled in big RCDs.
8.3.5
When fuel oil supplies are received through Road Truck Tankers (RTT), the
following may be ensured:
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