GENERAL SPECIFICATION G4--Lifting Equipment

Keyword：Lifting Equipment Time：2020-10-19 21:13:00

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

GENERAL SPECIFICATION G4

Lifting Equipment

CONTENTS

G4.3 Lifting Equipment ........................................................................................................................ 1

G4.3.1 General ............................................................................................................................. 1

G4.3.2 Reference Standards ........................................................................................................ 2

G4.3.3 Submittals ........................................................................................................................ 3

G4.3.4 Quality Assurance ............................................................................................................ 4

G4.3.5 Electric overhead travelling cranes .................................................................................. 4

G4.3.6 Manually operated overhead cranes ............................................................................. 10

G4.3.7 Jib Crane ......................................................................................................................... 11

G4.3.8 Monorail Hoists Block and chain block .......................................................................... 12

G4.3.9 Crane Access .................................................................................................................. 13

G4.3.10 Trolley ............................................................................................................................ 13

G4.3.11 Testing ............................................................................................................................ 13

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

G4.3‐1 Lifting Equipment

G4.3 LIFTING EQUIPMENT

G4.3.1 General

(a) All lifting equipment shall be provided complete with drive units, access platforms,

ladders, runway beam, supports, plinths, painting, labelling, field control panel,

emergency stop button, cabling, etc., with all necessary instruments required to

control the operation of system/ equipment and all other necessary accessories and

ancillaries required to form a completer and functional system.

(b) All lifting equipment shall be registered with the Factory Inspectorate under the

Ministry of Manpower (MOM), Singapore and copies of registration certificate (from

MOM) for the crane/lifting equipment, copies of which must be handed to the S.O..

registration with MOM, including all fees to be paid until the end of defect liability

period (DLP).

(d) All lifting equipment provided shall bear a permanent inscription on each side

legible from ground floor level stating the safe working load and the registration

number assigned by the Factory Inspectorate.

(e) The Contractor shall provide the test loads, any instrumentation required and the

level of supervision as required by the concerned authorities. The test load shall be

removed from site by the Contractor after successful tests have been carried out.

(f) The Contractor shall make his own assessment, by calculation or approved load

testing equipment, of the weight of main components to be lifted and, prior to

lifting, shall satisfy the S.O. that the safe working loads (SWL) of lifting equipment

are not exceeded.

(g) All relevant drawings and calculations of the lifting equipment endorsed by P.E and

submitted to the S.O for approval before any fabrication and installation is carried

out.

(h) Lifting gear shall be designed to allow a straight lift to be achieved.

(i) The “Safe Working Load” shall be marked conspicuously and clearly on all lifting

equipment.

(j) The Contractor shall engage a Professional Engineer (P.E) to design the crane system

and its associated equipment including any structural design. Contractor shall be

responsible for any necessary authority submission and obtain approval. The

Contractor shall submit application to MOM and engage an MOM approved person

to test the lifting equipment and certify it is safe for use. The PE certification and

registration with MOM shall valid until the end of the defects liability period (DLP)

for the Works.

(k) Laboratories accredited by the Singapore Accreditation Council (SAC) under the

SINGLAS scheme shall carry out all mechanical and non‐destructive testing for all

lifting equipment, as required by the Chief Inspector of Factories, Ministry of

Manpower. Only test reports issued by SAC‐SINGLAS accredited laboratories shall

be recognised.

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

Lifting Equipment G4.3‐2

G4.3.2 Reference Standards

(a) The following is a list of standards referenced but not limited to, in this Section:

(i) American National Standards Institute (ANSI):

1) B30.2, Overhead and Gantry Cranes (Top Running, Single or Multiple

Girder).

2) B30.10, Hooks.

3) B30.11, Monorails and Underhung Cranes.

4) B30.16, Overhead Hoists (Underhung).

5) B30.17, Overhead and Gantry Cranes (Top Running, Single Girder).

6) HST 1M, Performance Standard for Electric Chain Hoists.

7) HST 2M, Performance Standard for Hand Chain Manually Operated

Chain Hoists.

8) HST 4M, Performance Standard for Overhead Electric Wire Rope Hoists.

9) MH27.1, Underhung Cranes and Monorail Systems.

(ii) British Standards Institute (BSI):

1) BS EN 13001, Cranes. General design. General principles and

requirements.

2) BS EN 15011, Cranes, Bridge, and Gantry Cranes.

3) BS EN 12385‐1:2002+A1:2008, Steel wire ropes. Safety. General

requirements.

4) BS EN 3506, Mechanical properties of corrosion‐resistant stainlesssteel

fasteners. Bolts, screws and studs.

5) ISO 11660 Cranes. Access, guards, and restraints. Jib cranes.

6) BS EN 14985 Cranes slewing jib cranes.

(iii) Crane Manufacturer’s Association of America (CMAA):

1) 70, Electric Overhead Travelling Cranes.

2) 74, Top Running & Under Running Single Girder. Electric Overhead

Travelling Cranes.

(iv) Factories Act (Chapter 104), Singapore.

(v) International Electro technical Commission (IEC): 60529, Degrees of

Protection Provided by Enclosures (IP Code).

(vi) National Electrical Manufacturer’s Association (NEMA): MG 1, Motors and

Generators.

(vii) Singapore Productivity and Standards Board (PSB):

1) CP 5, Electrical Installations.

2) CP 16, Earthing.

3) CP 27, Factory Layout Safety, Health, and Welfare Considerations.

4) SS 497, Electric Overhead Travelling Cranes.

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

G4.3‐3 Lifting Equipment

G4.3.3 Submittals

(a) Contractor shall submitted the following as minimum:

(i) Make, model and weight of each equipment assembly.

(ii) Complete catalogue information, descriptive literature, materials of

construction, and specifications on hoist, wheels, gears and bearing, hoist

motor and assemblies, hook, brakes and accessories.

(iii) Structural design calculations for Crane and associated structure, Jib crane

mast, boom, support system, connection to main structure, and calculations

of deflection and loads on building. Designs and all calculations shall be

endorsed by the Contractor’s Professional Engineer (P.E) registered in a

relevant discipline.

(iv) Detail Shop Drawings of carne system, jib crane mast, boom and their

attachments to building concrete.

(v) Factory finish system.

(vi) Operation and Maintenance Manuals

(vii) Registration Certificate with Chief Inspector of Factories.

(b) Refer to electrical Specifications for motor submittals.

requirement for the Quality Control Submittals:

(i) Factory Functional Test Report.

(ii) Factory and field test procedures.

(iii) Manufacturer’s Certification of Compliance that the factory finish system is

identical to the requirements specified herein.

(iv) Special shipping, storage and protection and handling instructions.

(v) Manufacturer’s printed installation instructions.

(vi) Manufacturer’s Certificate of Proper Installation, including Site Functional

Test Report.

(vii) Statement from Manufacturer confirming 5 years of experience with similar

equipment required on the works.

(viii) Reference list of installations of similar equipment that has been in operation

for the past five years.

(d) Suggested spare parts list to maintain the equipment in service for a period of 1 to

5 years. Include a list of special tools required for checking, testing, parts

replacement, and maintenance with current price information.

(e) List special tools and materials supplied with equipment for use prior to and during

commissioning and for future maintenance.

(f) Provide warranty with the Employer named as beneficiary for complete equipment

including accessories and control system as specified under this contract

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

Lifting Equipment G4.3‐4

G4.3.4 Quality Assurance

(a) Qualifications:

(i) Manufacturer shall have a minimum of 5 years’ experience manufacturing,

providing, installing and commissioning similar equipment as required for

these Works.

(ii) Reference list of installations of similar equipment that has been in

operation for the past 5 years.

G4.3.5 Electric overhead travelling cranes

(a) General

(i) Cranes shall be designed in accordance with BS EN 13001 and BS EN

15011:2011+A1:2014.

(ii) The term crane shall be deemed to include gantry rails, platform with hand

rails for maintenance purposes, access ladder, down shop conductors, end

stops, holding down bolts and all other items required for complete

installation.

(iii) The longitudinal station travel, the transverse and the hoist shall be

electrically operated. The hoist by travel and traverse must be capable of

reaching every part of the area served and must be able to handle all the

corresponding installed equipment.

(iv) Operation shall be from ground floor level by bridge‐mounted pendant pushbutton

controls or remote control as specified.

(v) All the movements of the crane shall be geared so that one man of average

stature and strength can move and control the fully laden crane with

accuracy.

(vi) Controls shall be mechanically and electrically interlocked to prevent

inadvertent operation of opposing motions. The pendant control voltage shall

not exceed 50 V AC.

(vii) The pendant shall be supported independently of the electric cable and shall

be arranged for extending when necessary.

(viii) The crane shall be fitted with limit switches to prevent excess travel, overhoisting

and over‐lowering of the crane hook.

(ix) Electro‐mechanical fail safe brakes shall be incorporated on all poweroperated

motions.

(x) The crane shall be fitted with a load‐limiting device to stop the lifting

operation when the load exceeds the pre‐set limit.

(xi) The load sensor shall be of the strain gauge bridge transducer type calibrated

at the factory.

(xii) Crane hooks shall be fitted with safety catches and the hook block shall

incorporate fully guarded rope sheaves.

(xiii) Down shop conductors shall be of the fully insulated shrouded bus bar type.

The current collectors shall have renewable contact pieces. Festoon cables

may be used for the cross travel.

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G4.3‐5 Lifting Equipment

(xiv) A crane power supply isolating switch, lockable in the off position and

incorporating a supply on indicator light, shall be provided at the bottom of

the access ladder.

(xv) A second isolating switch shall be provided at the control cubicle located on

the crane platform.

(xvi) All motors shall be of the quick reversing type.

(xvii) All movements shall be electrically operated and shall function with the hook

loaded. Facilities shall be provided for the accurate location of the hook by

means of "inching" the cross travel and down shop travel motions.

(xviii) All the motions shall be suitable for the dismantling and accurate re‐assembly

of the equipment parts. The range of speeds shall be designed to give ease

of handling and maintenance of equipment without danger to the people,

staff or pumping station, installation etc.

(xix) Sufficient slings, ropes, shackles, and lifting beams shall be supplied to handle

all items of plant served by the crane. They shall be labelled or marked with

the Safe Working Load (SWL) and the purpose for which they are intended.

(xx) All necessary contactors, control cubicles and protection equipment

necessary to operate the crane and provide adequate electrical protection

against overload, phase and earth fault and fail safe protection in the event

of an interruption in the power supplies shall be provided.

(xxi) All electrical equipment shall be fully tropicalized where necessary. Motors

and switchgear shall be provided with anti‐condensation heaters which shall

be energised when the crane is at rest and suitable warning labels shall be

fitted.

(b) Crane accessories

(i) Hoisting Unit

1) The hoisting unit shall be of an electric driven wire rope type. It shall be

capable of safe operation with optimum acceleration characteristics.

Importance shall be given to minimum maintenance.

2) The design shall incorporate a normal hoisting speed and a much

slower creeping speed. Adequate interlocking and control shall be

provided to prevent over travel both upwards and downwards.

3) The crane hoist shall be capable of lifting and traversing in two

directions and to hoist a maximum load as specified.

4) The crane hoist shall be capable of lifting and traversing in two

directions and to hoist a maximum load as specified

(i) Cross travel unit

1) The above unit, namely the hoist trolley, shall have an electric drive.

Safe operation and optimum acceleration characteristics of the cross

travel unit shall be ensured through the use of individual drive units

incorporating self‐braking motors. Hoist trolley shall operate through

the entire distance along the crane girder

2) Importance shall be given to the presence of features allowing for

minimum maintenance.

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

Lifting Equipment G4.3‐6

(i) Long travel

1) The long travel unit shall have an electric drive. Safe operation and

optimum acceleration characteristics of the long travel unit shall be

ensured through the use of individual drive units incorporating selfbraking

motors.

2) Importance shall be given to the presence of features allowing for

minimum maintenance.

3) The drive shall be of the direct torque transmission type. Transmission

to the travel wheel shall be by splines through reduction gears and with

the gear wheels running in oil‐bath and with all shafts on anti‐friction

bearings.

4) The long travelling wheels shall be of double flange special spheroidalgraphite

cast iron type.

(ii) Hoisting rope

1) The rope shall be of the best plough steel, of twist‐free type and shall

comply with BS EN 12385‐1:2002+A1:2008.

2) Its breaking strength shall be not less than six times the safe working

load (SWL). Sufficient length of this rope shall be provided.

(iii) Rope drum

1) The rope drum shall be rolled, welded and precision machined from

high grade steel and shall be flanged at both ends. It shall be driven

through an internal gear rim and supported by large diameter bearings.

The drum shall have specially machined grooves.

2) The size of the drum grooves shall be such as to accommodate within

1 layer the length of rope required for the specified lift. Furthermore,

it should have no fewer than 3 dosed turns at each anchored and a

spare groove at the other end.

(iv) Rope guide: The rope guide shall consist of a pressure ring and a threaded

ring smoothly guiding the rope off the drum and operating the limit switch in

the event of hook over travel.

(v) Hook Block: The hook block shall be of the fully‐enclosed type conforming to

BS EN 1677 Part 5. The material of the hook shall be forged steel. The hook

shall be fully swivelling and shall be mounted on a ball or roller bearing. A

protective skirt shall be provided to enclose the bearing. A safety catch shall

also be provided. The block must be arranged for lowering down to the floor

level. The shape of the block shall be designed to avoid the catching of the block

when lifting through floors and openings.

(vi) Hoist rope pulleys: The above pulleys are to be of cast steel fitted with roller

bearings and arranged for grease lubrication.

(vii) Brakes

1) All motors shall be equipped with conical rotor electric mechanical

brakes. The springs for the brakes shall be of the compressive type and

shall not be stressed in excess of 80% of the torsional elastic limit of the

material.

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

G4.3‐7 Lifting Equipment

2) All brake linings shall be effectively and permanently secured.

Provisions shall be made for simple and easily accessible means of

adjustment due to wearing of the lining.

3) All brakes shall be protected from oil, grease, dust and any other

adverse effects.

4) The brake for the hoisting unit shall be the automatic type. When the

circuit is cut‐off or fails, it shall be able to arrest the motion and hold at

rest any load up to and including the test load at any position of the lift.

It shall be able to control with safety the lowering of any up to and

including the test load. The brake torque shall not be less than 250% of

the rated motor torque.

5) The brakes for the traversing and travelling units shall be able to bring

the crane safely to rest at any load up to and including the test load and

shall be of the automatic type.

(viii) Gears, bearings and lubrication

1) All gears are to be mounted on anti‐friction bearings and totally

enclosed within an oil tight housing. They are to be of high quality gear

steel and are to possess accurately machined teeth. The gear teeth are

in addition required to be hardened and highly resistant to wear and

fracture.

2) The bearings are to be of the anti‐friction type and required to be

permanently lubricated. The bearings shall be designed for a minimum

service life of 5 years.

3) Re‐lubrication, if necessary, shall be made possible through easily

accessible grease nipples. The latter shall be of uniform type and

readily accessible. Special attention is to be given to the lubricating of

points not readily accessible.

(ix) Crane runway rails

1) Contractor shall design, supply and install the crane runway rails. Rails

shall be constructed from the steel universal I‐beam.

2) The sizing of the steel universal I‐beam shall take into account of the

total load of the overhead travelling crane and the rated working load

with the appropriate safety factor for an efficient operation of the

overhead travelling crane.

3) The rails for the portal cranes shall be constructed of square bar of steel

suitable for the portal crane application. The rails shall be welded to

the levelling plates which extend throughout the whole length of the

rails.

(x) Transverse crane beam

1) Transverse Crane Bridge shall be a single box girder mounted on the

top of double channel end carriages for crane with a safe working load

of less than 10 tons.

2) Transverse Crane Bridge shall be a double box girder of double rail crab

for crane with a safe working load of 10 tons and above.

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

Lifting Equipment G4.3‐8

3) The box section shall comprise two rolled steel joints with the flanges

butting and continuously welded to provide a horizontally stiff girder.

(xi) Crane rail Support Joints

1) The rolled steel support members to which the crane rails are to be

fixed shall be provided. The joints are to be of approved dimensions

and type capable of adequately supporting the fully loaded crane at all

points and during travel without significant deflection.

2) The members are to be securely fixed to the supporting corbels from

reinforced concrete columns provided by the main contractors, by

purpose made shoes and deep stainless anchor bolts. The fixings shall

be of an approved design such that the members are simply supported

on the columns and impart no fixing moments.

3) End stops shall be installed to arrest the crane

(xii) Crane Rails

1) The crane rails complete with fish plates, holding down bolts and stops

etc. are to be supplied and fixed complete. The rails and fittings are to

be of heavy gauge flat bottom type.

(xiii) Bolts, Nuts and Washers

1) Bolts, nuts and washers shall be of stainless steel and shall conform to

BS EN 3506 ‐ Specification for corrosion‐resistant stainless steel

fasteners.

(i) General

1) The complete electrical isolation of the crane shall be controlled from

the main electrical control panel and such isolation shall have the effect

of stopping all hoist movements

2) The crane shall be controlled by low voltage operation via reversing

magnetic contactors from a pendant push‐button station if specified.

The control voltage, preferably 42V, shall be supplied by a transformer,

the primary and secondary windings of which are to be protected by

special fuse links.

3) Adequate control will be levied through the use of suitably placed limit

switches and brake mechanisms. Sufficient interlocking will also be

provided to ensure a fail‐safe unit.

(ii) Pendant push‐button system

1) If the crane control specified controlled from a push‐button station, it

shall be modern, practical and handy design and suitable for floor

operation.

2) The push‐button station shall be suspended from the Crane Bridge and

mobile along one side of the bridge through the use of trailing cables

supported by ball bearings trolleys or sliders running smoothly on a

rigid light aluminium track adjacent to the bridge.

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

G4.3‐9 Lifting Equipment

3) The control pendant shall be lockable to prevent misuse and shall be

provided with a special flexible hose to protect the control cable

against tensile stresses and possible mechanical damage.

4) The weight of the control pendant shall be supported independently of

the electric cable. If the control pendant is of metal, it shall be

effectively earthed.

5) The push‐buttons shall be housed in a sturdy, dust‐proof box of

approved material so designed as to give the required mechanical or

electrical protection to all operating parts.

6) The control pendant shall be capable of withstanding damage.

7) Each crane motor will be operated by two (2) push‐buttons, one for

each direction of motion. Each push‐button is to be of the double

pressure type for dual speed operation. All the buttons being resetting

and leaving the hoist ready for subsequent operation by any other

control button.

8) The push‐button station for the portal crane shall be of weatherproof

construction with a protection of IP 65.

9) The pendant control shall be positioned 1.3m above the operation and

control floor level or as per specified.

10) The pendant and cable shall be supported by a flexible non‐ferrous or

galvanised steel wire rope secured by splices and shackles.

(iii) Limit switches

1) Long travel and cross travel limit switches with over‐riding facilities

shall be incorporated and suitably arranged in the crane unit.

2) Limit switches required to cut‐off the raising and lowering motions

when the hook block reaches its top and bottom maximum limits shall

be provided.

3) Position limited switch shall be provided where more than one trolley

is operated on the same bridge to prevent the overshoot of the

crane and collision.

(iv) Load Limiting Device

1) Each crane shall be equipped with a load limiting device which can

measure the mechanical load being hoisted and can cease lifting

operation (and maintain the load in place) when the load exceeds the

pre‐set limit. The load sensor shall be of the strain gauge bridge

transducer type calibrated at the factory.

(d) Electrical works

(i) General

1) Contractor shall supply and install all the electrical works necessary for

the proper functioning of the electric overhead and portal crane

systems.

2) All the electrical works shall comply with the specifications of the

distribution system in General Specification ‐ Electrical Works.

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

Lifting Equipment G4.3‐10

(ii) MCC

1) MCC shall be complete with the following components:‐

 Motor starters

 MCCBs/ MCBs

 Main isolator

 Name plate

(iii) Power supply and Crane wiring

The crane shall operate on a 3 phase, 415 Volts, 50 Hz supply. Supply

shall be 60 volts fed from a transformer with an earthed centre tap

secondary.

1) Generally, the power supply to the cranes shall be through totally

enclosed copper bus‐ducts suitable for safe mobile power feeding to

the cranes except the portal crane.

2) The supply across the gantry beams shall be made by means of heavy

duty type multi core PVC cable running along a collector channel and

loading onto a spring loaded drum. The supply along the length of the

station must be completely insulated in a PVC housing and protected

against any accidental contact. The wiring collector and pick‐up gear

must be arranged for ease of maintenance from the crane gantry.

3) A red warning lamp shall be provided at each end of the track and shall

be illuminated when the power is on.

4) The controller shall be fixed to the crane and arrange for easy

maintenance.

(iv) Motors

1) The motors shall be squirrel cage induction motors with adequate

surface ventilation for intermittent duty and complies with General

Specification Electrical works.

2) The motor ratings shall conform to the relevant FEM design rules. Duty

times shall be assumed to be at least 25%. Insulation shall be fully

tropicalized and be preferably categorised in Class F.

3) The type of enclosure for the motor shall be dust and damp proof and

fitted with anti‐condensation heater as minim. And shall be conformity

with the appropriate IEC rules and the requirements as specified in

General Specification – Electrical works.

(v) Earthing

1) The crane structure, motor frames and metal cases of all electrical

equipment including metal conduit or cables guards shall be effectively

earthed.

G4.3.6 Manually operated overhead cranes

(a) Cranes shall be designed in accordance with BS EN 13001 and BS EN 15011.

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

G4.3‐11 Lifting Equipment

(b) The term crane shall be deemed to include gantry rails, end stops, holding down

bolts and all other items required for complete installation. All access ladders and

platforms necessary to carry out maintenance and repairs shall also be provided.

items of Plant served by the crane. They shall be labelled or marked with their safe

working load and with the purpose for which they are intended.

(d) The Contractor shall supply the test load. The test load shall be removed from site

by the Contractor after successful tests have been carried out.

G4.3.7 Jib Crane

(a) The jib cranes lifting capacity shall be according to the Particular Specifications and

contractor shall verify the loading capacity for the selected plant and equipment and

submitted the loading schedule for S.O. approval.

(b) Each unit shall complete with the base plate, mast, boom, hoist, anchor bolts,

provision for manually moving the hoist, lifting the load and rotating the boom as

required to make it as a complete functional system.

(d) All materials shall be properly selected for the stresses to which they will be

subjected. Jib crane assembly shall be fabricated in accordance with latest standard

and regulations

(e) The Jib crane mast, boom, trolley, hoist and other components shall be fabricated

using established procedures and welding shall be carried out by qualified welders.

(f) Lifting Lugs shall be provide for equipment and components weighing 40kg.

(g) All Anchor Bolts shall be Type 316 stainless steel, sized by equipment manufacturer,

(h) Free‐standing Jib crane

(i) Crane mast shall be base plate mounted. The crane will have full web gusset

plates, welded to the mast and base plate for stability and reinforcement.

Insert or sleeve mounted cranes shall not be accepted.

(ii) The crane mast shall be of adequate section size for the specified loading

conditions.

(iii) The mast height should be selected to have enough head room to facilitate

lifting of the equipment as indicated in the data sheets at the end of this

section.

(iv) The material of construction shall be carbon steel or any other suitable

material of manufacturers’ standard.

(v) The top end of the mast should be finished to attach the crane boom.

(vi) The boom will consist of a standard I‐beam or wide flange, and may be

reinforced with a cap channel for lateral stability.

(vii) Trolley stops will be utilised to prevent the hoist trolley from falling off the

boom or contacting any obstruction.

(viii) The boom will be level and horizontal, and will permit a hoist and trolley to

ride upon its flat flange track.

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CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

Lifting Equipment G4.3‐12

(ix) The crane’s deflection at the end of the boom should not exceed 1/150 of the

crane’s span.

(x) One end of the boom should be attached to the mast and should be able to

rotate about this connection point.

(xi) Bearings shall be heavy‐duty roller type, prelubricated and sealed. The

bearing shall have a L‐10 life of 50,000 hours as minimum.

(xii) All apparatus supplied under this Section shall be constructed with due regard

to safety of operation, accessibility, interchangeability and durability of parts.

G4.3.8 Monorail Hoists Block and chain block

(a) Monorail hoist shall comprise an electric hoist and a rolled steel joist.

(b) Load chain wheel driven through gear reductions, a hand chain wheel, load blocks,

sheaves, chain, hook, and hoist braking.

reasonable ease from floor level. n. Hand wheel shall have a guard that prevents

chain slipping or jumping. Chain hoists shall have chain storage adequate for storing

full lift length of chain and shall be designed and located to avoid interference while

hoisting.

(d) The hook shall be constructed with sufficient ductility to open noticeably before

hook failure, equipped with safety latch, free to rotate 360 degrees with rated load,

and positively held in place with locknuts, collars or other devices

(e) The brakes shall be accordance with ANSI HST 1M and 2M, adjustable to

compensate for wear. Positive action, Weston type mechanical load brake, with

uniform composition lining and forged steel alloy latch pawl.

(f) The chain block shall be provided with geared hand travel four wheel trolley suitable

for running from a rolled steel joist.

(g) The lifting chain shall be set quality corrosion resistant steel alloy, of such length to

allow a lift to be made from the ground level to loading level without re‐slinging.

(h) Electric hoist

(i) The lifting wire rope of the electric hoists shall be of best plough and of such

length to allow a lift to be made at ground floor level without re‐slinging. The

hoist mechanism shall be controlled from a hold on push button pendant.

(ii) Hoists shall be fitted with load limited devices for overhead travelling cranes,

unless otherwise specified.

(iii) The pendant shall be suspended independently of the electric cable 1300mm

above ground floor level. A stainless steel pendant holder shall be installed

on site. Control supply shall be not more than 60V fed from a two winding

transformer with an earthed centre‐tap.

(iv) Cables feeding the electric hoist unit and down shop cables shall be flexible

cables suspended from carriers sliding on taut wires.

(v) The electric drive motors shall be fitted with electro‐magnetic brakes to

prevent over travel on release of the control button.

CHANGI WATER RECLAMATION PLANT PHASE 2

CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

G4.3‐13 Lifting Equipment

(vi) Limit switches shall be installed to prevent over travel, over lowering and over

coiling of the lift rope. End stops and limit switches shall be provided to arrest

the hoist block.

(i) The lifting equipment shall include a triple leg chain sling with hooks; a suitable wire

rope sling; a nylon rope sling. The slings shall be of suitable length and strength to

enable a safe lift to be made of all items of equipment intended as indicated in the

drawings.

G4.3.9 Crane Access

(a) Fixed aluminium ladders and catwalks complete with toe boards etc. as required for

the full and proper access to the crane and appurtenant equipment for maintenance

purposes shall be provided.

(b) An aluminium alloy catwalk shall be provided on the crane, complete with handrails

and toe boards to enable ease of maintenance of the crane unless otherwise stated.

G4.3.10 Trolley

(i) Frame: Welded steel, cast steel, or ductile iron construction, or a combination

thereof. Construct to control deflection of trolley assembly while transmitting

the carrying load to running surface.

(ii) Drive shall consist of chain sprocket mounted on shaft. Furnish chain to within

5 feet of operating floor level. Drive shaft shall drive the trolley wheels

through a gear and pinion or spur gear arrangement.

(iii) Furnish roller assembly stabilizers on single‐girder trolley units to prevent

tipping during load pickup.

(iv) Wheels: Rolled or forged steel, accurately machined and ground to receive

inner bearing races. Furnish alloy steel axles. Rotating axles with wheels

mounted press fit and keys, or with keys alone. Minimum tread hardness 210

Brinell.

(v) Drive Gears: Helical, spur or herringbone type, rolled or cast steel, with

machine cut teeth.

(vi) Bearings: Combination radial and thrust type, double row, angular contact

ball bearings or single‐row tapered roller bearings. Bearings prelubricated

and sealed, or fitted for pressure lubrication. Locate pressure lubrication

fittings for accessibility during maintenance.

(vii) Brakes: Suitable for service class and rated torque capacities as specified in

ANSI B30.11.

G4.3.11 Testing

(a) The crane shall be tested in the presence of the S.O to demonstrate the safe

condition of the crane.

(b) Full Load tests in compliance with OSHA, ANSI and BS standards and Factories Act

by an approved person registered with the Chief Inspector of Factories. The load

test plan shall be submitted to S.O. for approval.

equipment with the Chief Inspector of Factories, Ministry of Manpower.

CHANGI WATER RECLAMATION PLANT PHASE 2

CONTRACT C22B‐CIVIL & STRUCTURAL, MECHANICAL & ELECTRICAL WORKS FOR TRAIN 5

Lifting Equipment G4.3‐14

(d) In the event the power supply is not available when the crane been installed,

temporary power supply or a hand operated hoist shall be arranged temporarily.

(e) After all the equipment have been installed the entire crane assembly included the

hoist chain shall be completely tested for all functions in the presence of the S.O

and a licensed tester. The contractor will be responsible for obtaining a certified test

certificate for the crane, a copy of which must be handed to the SO.

(f) Test complete assemblies for proper alignment and connection, and quiet

operation.

(g) In additional to the latest standard and regulation required, the full load test to be

conducted shall require that weights equalling the maximum capacity of the bridge

cranes and hoists be carried by the units as minimum, while the cranes and hoists

are operated as follows:

(i) Hoists operated through the entire lifting height for each of the units at

various positions of the crane and trolley for each crane, as directed by the

S.O.

(ii) Cranes operate through the entire length of the crane rails.

(iii) Hoist trolleys operate through the entire distance along the crane girder.

(iv) If the equipment fails the test all necessary changes shall be made and the

equipment shall be re‐tested. If the equipment again fails to meet the test

requirements to the satisfaction of the S.O, it shall be removed and replaced

with satisfactory equipment.

END OF SECTION