Section 1 Machinery and Dredging Equipment of Non Self-propelled dredgers

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101. General

l. The machinery is to be designed, manufactured and installed in order not to hinder the safety of dredger and the safety of life in normal operating condition.

2. The rotating, reciprocating, high temperature and electrically charged of machinery are to be pro- vided with proper protection devices in order not to be hindered to monitor, handle or access to these parts.

3. The machinery is not to be leaked the gas which are harmful to the health of operators or danger- ous of fire as far as practicable.

4. The machinery space is to be well ventilated to exhaust the gas of Par 3 rapidly.

5. The machinery is to be of the constructions and arrangements which are easily maintained and inspected.

6. Application

These requirements are to apply to prime mover, power transmission system, boiler, pressure ves- sels, auxiliary machinery, piping system and electric installations for pump type, bucket type, dipper type or grab type non self-propelled dredgers.

7. Terms

(1) The equipment or installations which are related to the safety of dredgers are;

(A) Anchoring system

(B) Mooring system

(C) Fire-fighting system

(D) Bilge discharging system

(E) Ballasting and de-ballasting system

(F) Lighting system

(G) Communication system

(H) Ventilation system for the spaces of internal combustion engines or boilers and the spaces which are required ventilation

(I) Feed water supply and burning system of boiler which are to supply steam to the equip- ment or installations mentioned from (A) to (H) and (J).

(J) Electrical power generating and its starting system which are supplying the electricity to the

equipment or installations mentioned from (A) to (I) and navigational lights, signal lights and radio equipment.

(K) Other installations where deemed necessary by this society

(2) The dredgers with restricted service areas are the dredgers of which navigational or working areas are restricted to smooth water and coastal, or equivalent area of smooth or coastal.

8. Special design or installation

Specially designed machinery or equipment are to comply with that acceptable to this society.

102. Prime mover and power transmission system

1. Internal combustion engine

(1) General arrangement, installation, safety devices, gas exhaust system and fuel oil system of in- ternal combustion engine are to comply with the requirements specified in Pt 5, Ch 2 and Ch 6 of the Rules for the classification for steel ships. However, the alarm system for pressure re- duction of lubricating oil specified in Pt 5, Ch 2, 203. 10 of the Rules for the Classification of Steel Ships is to apply only to the prime mover of generator for electrical power supply and the prime mover for power source of dredging equipment.

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(2) The machinery using for the systems and equipment which are related to the safety of dredgers are to comply with the requirements specified in Pt 5, Ch 3 of the Rules for the Classification of Steel Ships.

2. Steam turbine

(1) The steam turbine is to be provided with the overspeed protecting devices and adjusted that the speed is not to be exceeded 115 % of maximum continuous revolution.

(2) The steam turbine using for systems and equipment which have

relation

to the safety of dredg-

ers, are to comply with the requirements of Pt

Classification of Steel Ships.

3. Gas turbine

5, Ch 2,

Sec 3

of the Rules for the

The gas turbine is to comply with the requirements of Pt 5, Ch

Classification of Steel Ships.

4. Power transmission system

2, Sec

4 of the Rules for the

The power transmission system used for equipment or installations which have relation to the safety of dredger is to be of the construction acceptable to this Society.

5. Starting system of prime mover

The starting devices are to be provided to ensure that prime mover of generator for electric power supply and the prime mover of generator for power source of dredging equipment can be started

without external supply such as the supply of electricity or compressed air.

quirements are not applying to the dredgers with restricted service areas.

However, these re-

103. Boiler and pressure vessels

1. General

The boilers and pressure vessels are to comply with the requirements specified in Pt 5, Ch 5 of the Rules for the Classification for Steel Ships. However, the Class 3 pressure vessels used for the equipment and systems which have not relation to the safety of dredgers are not to comply with those requirements. And, one(1) feed water opening for boiler may be accepted.

104. Auxiliary machinery and piping system

1. General

(1) The auxiliary machinery and piping systems installed on the dredgers are to comply the require- ments of Pt 5, Ch 6 of the Rules for the Classification of Steel Ship and this chapter.

(2) The valves of piping systems which are operated by powered remote control system are to be

provided with means operable by manual.

2. Feed water system and burning system for boiler

Regardless of the requirements of Pt 5, Ch 6, Sec 5 and Sec 9 of the Rules for the

Classification of Steel Ships, one(1) set for boiler may be accepted.

of feed water pipings, feed

water pump and burning system

3. Cooling piping system, LO piping engine

system and fuel oil system for Internal combustion

Regardless of the requirements of Pt 5, Ch 6, Sec 7, Sec 8 and Sec 9 of the Rules for the Classification of Steel Ships, the spare pumps may be dispensed with respectively.

4. Auxiliary and piping system for dredging works

Regardless of the requirements of Pt 5, Ch 6 of the Rules for the Classification of Steel Ships, the materials and construction of auxiliary machinery and pipings which are using only for dredging works, are to be in accordance with the standards which are acceptable to this Society.

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5. Fuel oil transfer system for dredgers with restricted service areas

Regardless of the requirements of Pt 5, Ch 6, Sec 9 of the Rules for the Classification of Steel Ships, one(1) set of fuel oil transfer pump may be accepted for the dredgers with restricted service areas.

6. Bilge piping system

(1) For the spaces which is not related to the safe of dredger, regardless of the requirements of Pt 5, Ch 6, Sec 4 of the Rules for the Classification of Steel Ships, the bilge piping system may be dispensed with.

(2) Emergency bilge suction pipes, regardless of the requirements of Pt 5, Ch

Rules for the Classification of Steel Ships, may be dispensed with.

6, 403. 6 of the

(3) The spaces required to arrange the direct bilge suction pipe in accordance with the requirements

of Pt 5, Ch 6, Sec 4 of the Rules for the Classification of Steel Ships, are the spaces that are located below the load line specified in Ch 1, 307. of this Rules and installed electrical power source. However, the dredgers are designed that the bilges of those spaces are sucked by exclusive bilge pump, the direct bilge suction piping may be dispensed with in those spaces.

(4) The ejector and its attached pumps which are arranged to suck in bilge effectively are to be re- garded as the independent powered bilge pumps specified in Pt 5, Ch 6, Sec 4 of the Rules for the Classification of Steel Ships.

(5) Where dredgers have a special shape, and it is difficult to comply with the requirements of Pt

5, Ch 6, Sec 4 of the Rules for the Classification of Steel Ships, the internal diameter of main and branch bilge suction pipe, they are to comply with following formula,

(A) Branch bilge suction pipe

Ẁ G ËĦËÈĬJA ĞËÈ

d : Inner diameter of bilge suction pipe (mm )

A : Free surface area assumed that half of the depth of compartment is flooded (mË ).

However, the surfaces of internal members are not to be included in the free sur- face area.

(B) The inside sectional area of main bilge suction pipe is not to be less than the sum of in- side sectional areas of the largest two branch bilge suction pipes which are connected to the main bilge line.

(6) Regardless of the requirements of Pt 5, Ch 6, Sec 4 of the Rules for the Classification of

Steel Ships, the number of bilge pump may be of one(1) set, where this society accepts consid- ering the purpose and operating method etc. of the dredger.

7. Ballasting and deballasting system

(1) During operation, voyage or between these two periods, the dredger that ballasting and de- ballasting are essential to the safe operation, is to be provided with proper ballasting and de- ballasting systems in order to ballast and deballast with safe and rapid.

8. Air pipe and sounding pipe

(1) Regardless of the requirements of the of Pt 5, Ch 6, Sec 2 of the Rules for the Classification of Steel Ships, one(1) air pipe is accepted where deemed appropriate by this society considering the type of dredger and working condition.

(2) All tanks are to be provided with independent sounding pipes or remote water level indicator which is type-approved by this society. In case sounding pipe is exceeding 20 m in length, the internal diameter of sounding pipe is not to be less than 50 mm regardless of the require- ments of the Rules for the Classification of Seel Ships.

(3) In case remote water level indicator is installed in the tanks which are not easily accessed, oth- er means of spare sounding device are to be provided.

9. Remote operation of Sea suction and discharge valve

(1) The sea suction and discharge valves located in the spaces(generally, unmanned compartments)

below the load line specified in Ch 1, 307., are to be of remotely operating

(2) In case sea suction and discharging valves of generator are of power and

valves.

remotely operating

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ones, in no case opened valve is closed or shut valve is open when electrical power supply of control system fails.

10. Testings

Regardless of the requirements of Pt 5, Ch 6 of the Rules and Classifications of Steel Ships, the testings of machinery, equipment and piping systems are to comply with 109. of this Chapter.

105. Dredging equipment

1. General

(1) Prime mover, machinery, strength and safety devices of dredgers are to be of that acceptable to this society.

(2) In case dredging equipment are breaking down of its parts and control system, or losing power

source of driving system, they are not to lower the safety of dredgers.

(3) In case hydraulic or compressed air is used as a power source of dredging equipment. the pow- er source of hydraulic or compressed air is not to be less than two(2), and the dredging equip- ment are to be operated when either of power sources fails. However, for the dredger operat-

ing in restricted service areas, one(1) power source of hydraulic or air pressure may be accepted.

2. Pump type dredging equipment

(1) The suction and discharging pipes for dredging pumps are not to comply with the requirements of Pt 5, Ch 6, 30l. of the Rules and Classification of Steel Ships.

(2) In case the dredger is working in the areas with 25 m or more in depth, the reducing device to decrease the suction pressure is to be provided in the suction pipes for the prevention of pump cavitation.

3. Bucket type dredging equipment

(1) The bucket lip is to be made of change.

4. Grab type dredging equipment

wear resistant steel and to be of easily maintenance and

(1) The material of grab is to be of steel or equivalent strength to wear and impact resistant.

106. Electric installations

1. General

(1) The requirements except testing ones of the Pt 6 Ch 1 Sec 18 of the Rules for Classifications of Steel Ships. in principal, are applying to the electric installations for dredgers. However, these requirements are not applying to the electric installations only

the the for

dredging works but this society may require that the electric installations are to be appropriate

to the requirements of the nations or the international standards where deemed appropriate by this society.

(2) In case the requirements of Pt 6, Ch 1 of the Rules and Classifications of Steel Ships accord- ing to the above mentioned requirements, the requirements of 106. 2 to 106. 6 are applying to

the

electric installations in stead of the requirements of the high voltage electric installations of

the 109. of the Rules and Classifications of Steel Ships and that approved by this society.

2. Main source of Electric power

(1) The dredger is to be provided with at least two sets of electric power systems, and the capacity of these electric power systems are to be such that in the event of any one of electric power system being breakdown by any failure of generator, its prime mover or its relevant auxiliaries, the remaining electric power system is to be of sufficient to supply the electrical power to the following electric loads and equipment or systems which have relation to the safety of dredgers.

(A) Navigation lights and signal lights etc. required by domestic or international regulations

(B) Wireless radio system

(2) For the dredgers with restricted service area, one(1) set of electric power system is acceptable.

However, the dredgers of which the navigational lights and signal lights etc. mentioned above

(A) are of only electric type, are to be provided with other proper source of electrical power

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(3)

(4)

(5)

separately in order to capable of lighting when source of electric power fails

In case the source of electric power is of A.C. generator, other generating motor is not to be failed or over voltage drop which gives harmful effect to other electric installations is not to be arose by starting current of maximum output of generator.

The requirements of (1) to (3) are not applying to the dredgers which are planned to be sup- plied electricity from other dredgers or source of electric power of shore-based. However, the dredgers which have navigational lights, signal lights etc. required by (1) (A) are to be capable of lighting without supply of electric power from other dredgers or source of electrical power of shore-based.

For sources of electric power which are installed on dredgers with restricted service areas, the generator and its prime mover as the source of electric power needed for dredging works other than that required by (2) may be regarded as the machinery for using only dredging works even in case they are installed for using of source of electric power.

3. The number and capacity of transformer for power and lighting

(1) The number and capacity of transformer using for electric supply of dredgers are to be suffi- cient to supply the electric power to the equipment or installations which have relation with the safety of dredgers and loads specified in 106. 2 (1) (A) and (B) in case of any one generating set being stopped. However, one(1) transformer may be accepted where other proper means is considered to supply the electrical power to the loads.

(2) The dredgers with restricted service areas are not to comply with the requirements mentioned previous Para. where deemed appropriate by this Society.

4. Emergency electric installations

(1) The dredgers are to be provided with emergency electric installations which are appropriate to the requirements of Pt 6, Ch 1, Sec 14 of the Rules for the Classifications of Steel Ships. However, the supplying time of emergency electric power and the kind of emergency loads may be increased or decreased according to the type of dredgers.

(2) The emergency source of electric power equipment are to be installed in the space which is apart from dangerous spaces specified in each Chapters, and it is to be located such as to en-

sure the electric supply to emergency loads without any difficulties in case of a fire, flooding or other casualties in the space containing main source of electric power.

(3) The requirements of (1) and (2) are not to apply to the dredgers with restricted service areas.

5. Final sub-circuits

(1) In general, a separate final sub-circuit is to be provided for every electric motor used for in- stallations and equipment which have relation with the safety of dredgers.

(2) Final sub-circuits for lightings are not to be connected with heaters and motors. small sized electric appliances for life such as electric fan etc. are excluded.

However,

(3) A separate final sub-circuit is to be provided for each heater. However, a final sub-circuit not

exceeding 15 A in rating may be connected with two or more heaters.

(4) Each insulated pole of final sub-circuit is to be protected by a fuse or a circuit breaker.

6. High voltage electric installations

(1) In case where High voltage have relation with the safety

(2) High voltage machinery and

exceeding 500 V is used for the equipments or installations which of dredgers are to be of that deemed appropriate by this Society. cables used for dredging works are to be of that are appropriate

to the requirements of nations or international standards where deemed appropriate by this

Society.

107. Automatic and remote control of machinery

1. General

(1) The dredgers of which the machinery is automatic controlled, are to be provided with control and monitoring systems in order to operate safely by planned staff.

(2) The control system is to be operated in fail-safe side in order not to give danger to the crew in charge or targets to be controlled in case of failure of system or failure of main source of

electrical power.

(3) The machinery used for equipment or installation which have relation to the safety of dredgers are to be operated by other means without any difficulties even in case of failure of automatic

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or remote control system.

108. Spare parts, tools and instruments

1. General

The dredgers are to be provided with spare parts, tools and instruments specified in this requirements.

2. Spare parts

(1) The spare parts for diesel engine, steam turbine and boiler which are intended for electric pow-

er source, are to comply correspondingly with the

requirements of Pt 5, Ch 1, Sec 4 of the

Rules for the Classification of Steel Ships for the spare parts of auxiliary diesel engine, steam turbine and boiler.

(2) The spare parts of bilge pump is to comply Rules for the Classification of Steel Ships.

(3) The spare parts of ballast pump specified in

with requirements of Pt 5, Ch 1, Sec 4 of the

106. 6 of this Chapter is to comply correspond-

ingly with the requirements of Pt 5, Ch 1, Sec 4 the Rules for the Classification of Steel Ships for the spare parts of bilge pump.

(4) The spare parts of air compressor which is intended for starting of diesel engine used for elec- trical power system are to comply correspondingly with the requirements of Pt 5, Ch 1, Sec 4

of the Rules for the Classification of Steel Ships for air compressor.

3. Tools and instruments

The tools and instruments of boilers using for electric source and all other boilers are to comply correspondingly with the requirements of Pt 5, Ch 1, Sec 4 of the Rules for the Classification of Steel Ships for essential auxiliary boiler and all auxiliary boilers.

4. Spare parts for the dredgers with restricted services

The dredgers with restricted service areas are to be considered appropriately for applying the re- quirements of 108. 2 and 108. 3

109. Testing

1. General

(1) The testing of machinery is to comply with the requirements of this Chapter.

(2) Where deemed necessary by this society, the testings other than that specified in the Rules may be required.

(3) Where the machinery have certificates which are considered appropriate by this society, parts or

all of tests may be omitted.

(4) For the machinery manufactured by mass production system or special managing system, at the request of manufacturer and where the manufactory is considered appropriate by this Society, the proper testing methods fit for manufacturing system is to be adopted.

(5) Where considered appropriate by this Society, the test methods other than that specified in 109.

may be adopted.

2. Testing

(1) Boilers, class 1 and class 2 pressure vessels, piping systems and electric installations are to be tested in accordance with the requirements of relevant Chapters. However, the piping systems used for only dredging works and liquids other than flammable or toxic are not to comply with that mentioned above. And, the shop tests are to be carried out only for electric installations which have relations to the safety of dredgers among those specified in (A) to (E). However, electric installations exceeding 3,000 V in rated voltage and using for others purposes which have no relation to the safety of dredgers, a voltage resistant testing which is deemed appro- priate by this Society, is to be carried out.

(A) Generators and electric motors

(B) Control system for electric motor

(C) Main switch boards

(D) Transformer for power and lighting

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(E) Semi conductor regulator and its accessaries

(2) Prime mover, power transmission system, class 3 pressure vessels and auxiliaries using for in- stallations or systems which are related with the safety of dredgers, are to be tested with the requirements of relevant Chapters. However, where deemed appropriate by this society, the con- tents of testing may specially considered in accordance with the purpose of installations.

(3) The operating tests for the installations and equipment which have relation to the safety of dredgers, are to be carried out after their installation onboard.

(4) The functional tests, for the installations, equipment and remote control and automatic control systems attached to the boiler which have relation to the safety of dredgers, are to be carried

out after their installation onboard.

(5) The functional tests for the safety equipment and systems which are required by this Rules, are to be carried out after their installation onboard.

(6) Source of electrical power regarded as machinery used for only dredging works in accordance with the requirements of 602. 5 of the requirements and source of electrical power used for

equipment and systems other than that are related to the safety of dredgers, of which are re-

lated with followings are to be carried out operating tests after installed onboard.

(A) Source of electrical power of which the voltage is exceeding direct current 1,000 V or alter- nate current 3,000 V

(B) Parallel operation with source of electrical power (Including transfer of source of electrical power)