The document discusses different types of fuel oil used in power plants, including their typical specifications and uses. Light diesel oil and high speed diesel oil are normally used in auxiliary boilers or as an ignitor for certain boiler designs, while heavy furnace oil is generally used for power boilers. The document outlines fuel oil unloading, storage, pressurizing, and safety procedures, describing the systems used to transfer oil from railway tankers to storage tanks and then pressurize and distribute it for boiler use.

1. M. Nageswar Rao,
Sr.Mgr.(EMD)
Date: 09.10.2015
Venue: EDC, Simhadri

2. Presentation layout
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3. 3
Purpose of Fuel Oil
 Initial firing of the Boilers
 Flame stabilization
 Low load operation

4. 4
Types Of Fuel Oil
 Light diesel oil (LDO)
 High speed diesel oil (HSD)
 Heavy Furnace oil (HFO)
 Low sulphur heavy stock (LSHS)

5. 5
Use of different types
 LDO & HSD normally used in
 Auxiliary boiler
 Ignitor for certain boiler design.
 HFO generally used for power boiler

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TYPICAL HFO SPECIFICATIONS
 Standard : IS 1593 / 1971, Grades LV-
MV-HV
 Flash point : 660C (minimum)
 Viscosity (Max.) : 80-120-370 CST at 500C
 Gross heating value : 10270 Kcal/kg
 Total Sulphur (Max.) : 3.5-4-4.5%by weight

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Presentation Outline
 FO unloading system
 FO storage
 FO pressuring pump house
 Safety procedure in FO handling

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FO unloading system
 Heavy oil is received at the site in railway tankers of 20
tonne capacity each
 An unloading header with number of receiving points
for number of wagons unloading is provided.
 The connections between loading header and tankers
are through rubber flexible hosepipes.
 Railway tankers are equipped with steam heating
coils.

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Transfer P/P
Strainers

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HEATER
Steam
R/C
O/L
I/L
FILLING HDR
Suction HDR
Return Hdr
Return oil
From Unit

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Suction Header Return Header
Recirculation P/P
OIL
TANK
OIL
TANK

12. 12
Flash
Tank
Return Steam
From Heater
Steam to Atmosphere
Water to Sump Pit
Sump Pump

13. 13
DRAIN
HDR
Drain
Tank
Drain Oil p/p
Oil
Tank

14. 14
HOTV
HORV
CV
Oil Guns

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