Section 4 Boilers Using Crude Oil

401. General

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402. Boilers

1. The whole surface of boilers is to be gas-tight and separated from engine rooms.

2. Means are to be provided for boilers to be automatically purged before firing.

3. Warning notices describing measures to be taken in cases where the gas detectors specified in 405.

are activated is to be fitted in easily visible locations near boiler controls.

4. One pilot burner in addition to the one used for normal burning control is required.

403. Fuel supply systems

1. Fuel oil is to be directly sucked into fuel injection pumps from crude oil tanks or exclusive fuel oil tanks. However, such fuel oil is to be subjected to suitable treatment. The exclusive fuel oil tanks are to be separated from non-hazardous areas by means of cofferdams with gas-tight bulkheads.

2. The auxiliary systems, including pumps, strainers, heaters and etc., is to be fitted in hazardous areas and separated from engine and boiler rooms by gas-tight bulkheads.

3. In cases where fuel oil is heated by steam or hot water, heating coil outlets are to lead to separate

observation tanks. The observation tanks The observation tank is to be fitted with

are to be closed tanks and installed in hazardous areas. a air pipes and opening end of the air pipe is led to the

position specified in Pt 8, Ch 2, 104. 3 (4) (A) (c) of Rules for the Classification of Steel

Ships and to be fitted with the flame screen specified in Pt 7, Ch 7, 1003. 2 (3) of Rules for the Classification of Steel Ships equivalent thereto.

4. The electric prime movers of pumps are to be fitted in machinery space or areas other than the hazardous areas specified in Ch 7. In cases where drive shafts pass through pump room bulkheads or deck plating, means of ensuring the permanence of the gastight seal specified in Pt 7, Ch 1, 1002. 1 (1) (B) of Rules for the Classification of Steel Ships are to be fitted.

5. Pumps are to be fitted with pressure relief bypasses from the delivery to suction sides.

6. Pumps are to be capable of being remotely stopped from the following positions:

(1) Near boilers or machinery control rooms

(2) Outside engine rooms

7. In cases where it is necessary to preheat fuel oil, automatic temperature control devices and high temperature alarm devices are to be fitted.

8. The crude oil piping is, as far as practicable, to be fitted with a slope rising towards the boiler so that the oil naturally returns towards the pump room in the case of leakage or failure in delivery pressure.

9. Fuel oil pipes in engine rooms and boiler rooms are to be fitted within metal ducts. Such ducts are to be gas-tight and tightly connected to the fore bulkheads separating pump rooms. These ducts are to be at an incline rising towards boilers so that oil naturally returns towards pump room in the case of leakage, etc.

10. Duct are to be fitted with gas-tight inspection doors in way of the pipe connections within such ducts, with automatic closing drain traps placed on the pump room side which are set in such a way as to discharge any fuel oil leakage into pump rooms.

11. Ducts

fied in

are to be fitted with air pipes and opening end of the air pipe is led to the position speci-

Pt 8, Ch 2, 104. 3 (4) (A) (c) of Rules for the Classification of Steel Ships and to

be fitted with the flame screen specified in Pt 7, Ch 7, 1003. 2 (3) of Rules for the Classification of Steel Ships equivalent thereto.

12. Ducts are to be permanently connected to inert gas systems or steam pipes in order to make pos- sible:

(1) The injection of inert gas or steam in the duct in case of fire or leakage

(2) The purging of the duct before carrying out work on the piping in case of leakage

13. Shutoff valves remotely controlled from positions near boiler fronts or machinery control rooms are to be provided on the on pump room side of fuel pipes passing through pump room bulkheads. Remote control valves are to be interlocked with hood exhaust fans to ensure that whenever fuel oil is circulating the fans are running.

14. Emergency shutdown valves are to be fitted on the fuel oil supply to each boiler manifold.

15. Boilers are to be fitted with suitable drip trays placed in such a way as to collect any possible oil leakage from burners, valves and connections. Such drip trays are to be fitted with removable

flame arresting wire gauze and drain pipes discharging into drain

16. Drain tanks are to be fitted with air pipes and opening end of

tanks in pump rooms.

the air pipe is led to the position

specified in Pt 8, Ch 2, 104. 3 (4) (A) (c) of Rules for the Classification of Steel Ships and

to be fitted with the flame screen specified in Pt 7, Ch 7, 1003. 2 (3) of Rules for the Classification of Steel Ships equivalent thereto. Additionally, liquid level indicators and alarm systems are to be provided in order to detect leaks.

17. Drain pipes are to be fitted with arrangements to prevent the return of gas into boiler or engine rooms.

18. Burning systems are to be equipped with suitable mechanical interlocking devices so that running on normal fuel oil automatically excludes running on other fuel oils and vice versa.

404. Ventilation systems

1. Boilers are to be fitted with suitable hoods placed in such a way as to enclose as much of the burners, valves and fuel oil pipes as possible without blocking combustion air inlets.

2. Hoods are to be fitted with suitable access to fuel oil pipes and valves.

doors placed in such a way as to enable the inspection of and

3. Hoods are to be fitted

104. 3 (4) (A) (c) of

flame screen specified

with ducts. Such ducts are led to the position specified in Pt 8, Ch 2, Rules for the Classification of Steel Ships and to be fitted with the in Pt 7, Ch 7, 1003. 2 (3) of Rules for the Classification of Steel

Ships equivalent thereto.

4. At least two non-sparking mechanical ventilation systems are to be fitted so that the pressure inside hoods is less than that in boiler rooms. Ventilation systems are to be capable of automatic change- overs in the case of stoppages or failures.

5. The prime movers of the ventilation systems specified in Par 4 above are to be placed outside ducts and gastight bulkhead penetrations are to be arranged for shafts.

6. Boiler compartments are to be fitted with mechanical ventilation systems and are to be designed in such a way as to avoid the formation of gas pockets. Ventilation systems are to be separated from those intended for other spaces.

405. Gas detectors

1. The gas detectors specified in Pt 7, Ch 5, Sec 13 of Rules for the Classification of Steel Ships are to be fitted with intakes in the ducts specified in 403., in the ventilation hoods speci- fied in 404. and in all spaces where gas dispersion may not occur.

2. Gas concentration visual alarm devices are to be provided near boiler fronts and in machinery con-

trol

rooms.

And gas

concentration audible alarm devices are to be provided in machinery spaces

and control rooms.