specification for electrical, MDB, mccd, etc generator, CCTV, Instrumentation

1. SUPPLY, INSTALLATION AND COMMISSIONING OF XXX kVA PRIME RATED
SILENT TYPE BRAND NEW DIESEL GENERATOR
Instructions:
1. It is compulsory to have a site visit prior submission the bid
2. The generator room arrangement drawing shall be submitted by the bidder with the
internal arrangements
3. Any measure and pay items/works are not accepted and those bids will be disregarded
4. The all products should be the European brands (CAT & Etc)
5. Bidder should meet the conditions given below and essential to be submitted the
provide comply sheet with the relevant details (if this is not included, the bid will be
disregarded)
6. The supplier shall be in generator business for more than 25 years in Sri Lanka. (All
bidders without a proof for more than 10 years in generator business will be disregarded)
7. The prospective supplier shall have a workshop facility operating under ISO standards
and competent technical staff (all details should accomplish with the bid)
8. The service centre locations by including minimum time takes to attend the proposed
generator site after an occurrence of a breakdown should accomplish with the bid
9. A list of customers who use the proposed generators shall be included with the bid (if
this is not included, the bid will be disregarded)
10. Specimen of factory test report of similar model generator should be supplied with the
bid.

2. Introduction
The generator installation shall comprise of brand new Diesel Generators (2021 or latest), sound
attenuated canopy (factory fitted) to maintain the sound levels not to exceed 85 dBA at 7 meters
from any discharge or inlet openings when generators run at full load. The generator set should be
XXX kVA continuous prime rated with engine mounted radiator and mounted on skids complete
with fuel tank, silencer, switch board etc with all equipment self contained is required with the
following site conditions
Temperature minimum /maximum _ 20C /40C
Humidity _ 70 to 95%
All metal parts and enclosures to be well suitable to withstand corrosive environments and weather
conditions.
Engine
The diesel engine (2021 or latest) shall be in line, 4 stroke, turbo-charged, water cooled, direct
injection, compression ignition type capable of cold starting and generally complying with BS
649/5514 with respect to rating. The engine shall be of manufacturer's existing range, sufficiently
tropicalised to withstand our local climate condition and of proven design with extensive operation
experience. The speed of the engine shall be 1500 rpm. The engine(s) shall comply with BS
649/5514 as regard to Class A governing, cyclic irregularity and angular deviation.
Starting and Control System
The starter motor shall be direct/mounted, suitable for using 24 volts battery starting. The motor
shall be sufficiently liberally designed to perform 5 consecutive starting attempts without
overheating.
Battery
The batteries shall be of high performance plate cell type with ampere rating for ten successive
starting or attempt to start without recharging. The batteries shall be supplied complete with
transport plastic containers, terminal links and insulation cover, mounted on an approved steel
stand. Original maintenance manuals and a complete set of tools in container/box shall be supplied.
The list of tools shall include a pair of correct size spanners with insulated handle, thermometer,
hydrometer, funnel, measuring container.

3. Battery Charger
A trickle type battery charger connected to the mains supply to be installed to keep batteries in
charge by maintaining the required voltage always.
Charging Alternator
An engine driven charging alternator of adequate capacity together with the regulator unit shall be
provided for the charging of the battery when the engine is running. The alternator-charging rate
shall be specially set to suit the type of battery in use.
Wiring
All wiring shall be of original factory manufacture. Each cable shall have its individual label and
cable lug. The labelling shall be of PVC ferrules ring type capable of self-holding at cable end.
Governor
Electronic governor shall be provided and installed where it is readily adjustable to less than 3%
drop on the synchronous setting. Electronic type of governor shall be with built-in radio/noise
suppressor for interference free operation. An external means of adjustment of the nominal speed
setting ± 5% at all loads between zero and rated load shall be provided. On suddenly taking off the
rated load while running at rated speed, the maximum change of speed as a percentage of rated
speed shall temporarily not exceed 10% and permanently 4.5%. The maximum recovery time shall
be 8 seconds. On a change of load, both on and off, by any step of 25% of the rated load while
running at rated speed, the maximum change in speed as a percentage of rated speed shall
temporarily not exceed 4% and permanently 1.5% The maximum recovery time shall be 5 seconds.
Fuel system and fuel tank
The engine shall have a dust-proof fuel injection pump complete with full flow filters. The filters
shall be of the replaceable element type. The base frame design shall incorporate an integral fuel
tank with a minimum capacity of 8 hours. Otherwise a comparable fuel tank with the same capacity
shall be supplied. Fuel return coolers shall be fitted at the fuel return pipes from generator set to the
daily service tank to cool down the fuel which is heated by the generator set. Quick release shut off
valves shall be installed in the supply line and these shall meet the requirement of Fire Services
Department. It shall be complete with contents indicator, fuel fill cap with breather and stainer, fuel
feed and return lines to engine and drain plug.

4. Lubricating system
A gear type pressure pump with duplicate full-flow filters of replaceable element type shall be
provided. An oil temperature stabilizer shall also be fitted. An aluminum oil tray of adequate
dimension capable of covering the entire location of the engine block and filters shall be provided.
Crankcase drainage outlet shall be provided with an extended pipe complete with ball valve and
end cap.
Cooling system
The engine shall be a water-cooled type using engine-mounted radiator. A thermostat and warming
up by-pass system shall be fitted. The level sensor shall be so connected to provide an alarm as well
as shut down the engine when low level is detected. A stone guard shall be provided to protect the
radiator core from accidental damage. Adequate amount of manufacture’s recommended anti-
corrosive additive shall be provided in the jacket water.
Air system
The air filter(s) shall be provided complete with heavy duty, replaceable paper filters and air
restriction indicator for each filter. The turbo-charger shall be lubricated and cooled by the engine
oil and filtered by a separate oil filter.
Exhaust system
Exhaust piping shall be constructed of minimum 2mm thick stainless steel and to be taken up to the
roof level and discharge. The system to be incorporated with necessary items for satisfactory
operation. Expansion joints shall be installed in the exhaust lines. The silencers and piping shall be
supported from the soffit by means of vibration isolator spring hangers and C-channel etc. Flexible
pipe of bellow type and other accessories such as flanges, bolts, nuts, spring washers, and washers
as well as mounting brackets shall be of stainless steel. Exhaust piping passing through the wall of
the generator room shall be sleeved by means of pipes, Rockwooll and grouted to the wall.
The entire pipe works up to the roof level as well as exhaust manifolds and silencers, inside the
generator room shall be insulated with Rockwool of minimum 50mm thick and externally wrapped
with gauge 25 aluminum sheets. Before applying thermal insulation entire piping system shall be
pressure tested for leaks.

5. The complete system other than the stainless steel pipes before thermally insulated shall be painted
with two coats of high quality heat resistance paint that withstand a surface temperature of 650C.
All pipe joints shall be done by argon welding but special attention is to be emphasized on stainless
steel as the correct type of material should be used. The exhaust pipes outside the generator room
shall be of stainless steel including the bolts, washers, spring washers, nuts, mounting brackets and
flanges.
The flange shall be within the room and approximately 300mm away from the inner wall. The
stainless steel pipes shall be in accordance to AISI Standard Notation 316, Schedule 40 and
seamless Class C. A moisture trap with drain cock shall be fitted at the lowest point of the pipe
work and wherever necessary. The total system back pressure of the exhaust system including the
primary and secondary silencers shall be determined by the contractor and must not be more than
the maximum back pressure allowable for the diesel engine offered. All joints using flanges shall be
provided with correct type of gasket suitable for heat and shall be metal reinforced.
Primary exhaust silencer
The primary exhaust silencer shall be installed within the equipment room as close as practical to
the exhaust outlets of the engine. The primary silencer shall be a multiple chamber reactive type
designed for low frequency noise and exhaust pulsation control. The silencers shall be of welded
sheet steel construction, and all components shall be finished with high quality heat resistance paint
for surface temperature of up to 650C. The silencer shall be thermal insulated with Rockwooll of
minimum 50mm thick and wrapped with gauge 24 aluminum sheets to minimize heat being
transmitted to the surrounding.
Fuel/water separator
The fuel water separator shall be installed with water sensor detector type and connected to the
control panel. The water detector shall shut down the engine and provide visual and audible alarm
when water is detected in the water separator.
Automatic engine protection
The following protective devices including discriminatory circuits for fault warning shall be
incorporated. The circuits shall remain fail or inoperative, isolate and lock up until fault is rectified.
a) Over voltage

6. b) Under Voltage
c) High lubricating Oil Pressure
d) low radiator coolant level
e) Low Lubricating Oil Pressure
This device shall operate when the engine oil reaches a predetermined low pressure level and trip
the fuel cut-off solenoid, lock-up the engine starter relay and provide visual and audible alarm.
Over speed
An electrical over speed trip shall be arranged to trip the fuel cut-off solenoid when the engine
reaches a speed of 1700 rpm. A manual reset device shall be incorporated. The system shall also
lock-up the starter relay and provide visual and audible alarm. In addition, a mechanical over speed-
tripping device shall be installed to operate when the engine reaches a speed of 1800 rpm. This
device shall trip the fuel pump back to no fuel position or to cut-off the air supply into the
combustion chamber.
Alternator
The alternator (2020 or latest) shall be of the synchronous machine, drip proof, brushless,
permanent magnet excitation, and salient pole construction with heavy damper winding and directly
coupled to the engine by flexible disc coupling. The alternator shall be able to maintain a
continuously rated output of the given rating at 0.8 p.f. at 400/230V, 50Hz, 3 Phase, 4 wires and
capable of running an overload of 10% of full rated load for an hour in any period of 12 hours
complying to BS 649/55154. The supply required for other accessories shall be excluded from the
above net output.
Windings
Winding insulation shall be of Class H and impregnated for service in tropical climate and starter
winding shall be wound to 2/3 pitch to eliminate triple harmonics.
Voltage regulator and exciter
A solid state automatic voltage regulator (AVR) shall be fitted as standard equipment. The AVR's
control shall be of 3-phase voltage sensing type. Voltage Regulation shall be within 2% from no
load to full load at any power factor between 0.8 lagging and unity. In transient response of rated
load at any lagging power factor, the output voltage shall recover to within 3% of the steady state
value in 0.35 seconds. The alternator terminal voltage shall be readily adjustable to + 5% of rated

7. voltage. An external means of adjustment shall be provided at the Generator Control Panel. The
voltage drift shall be negligible and the total harmonic content of the open line voltage wave form
shall be less than 2% measured across line to line or across line to natural. The output shall be
suppressed for any radio and telephone interference in accordance with BS 4999.
Generator switch board
The generator switchboard shall be provided with the following equipment. Generator circuit
breaker with a fault current rating of min 50kA and fully capable of carrying the full load current
continuously complete with shunt trip and over current protection.
(a) Tacho meter
(b) Frequency meter
(c) Hour run recorder
(d) Power factor meter
(e) Volt meter with selector switch
(f) Ammeter with selector switch
(g) kw meter
(h) kwh meter
(i) Lub oil pressure gauge
(j) Water temperature gauge
(k) Duty selector switch
(l) Emergency stop button
(m)Trickle charger complete with ammeter
(n) Low lub oil pressure indication
(o) High water temperature indication
(p) Over speed shut down indication
(q) Generator running indication
(r) Fail to start indication
It is the duty of the contractor to make known of our requirement to the manufacturer for
complying with our specification.

8. Equipment finish
All sheet metal components shall be finished with polyester powder painting with suitable corrosive
protection and all finishes shall be electroplated. The ultimate finish construction shall withstand
the rigorous site conditions.
Noise and vibration control
The following precautions shall be taken against the generator and transmission of noise and
vibration.
a) All rotating machinery shall be dynamically balance.
b) All rotating machinery shall be mounted on vibration isolating supports.
c) Pipe connections to machines shall be made with flexible connections.
d) Fluid flow paths shall be as free as possible from constructions and raw edges.
e) Piping and other equipment connected to machinery and supported from the building
structure shall be mounted on vibration isolating supports.
This tenderer shall be responsible for providing a complete noise control system for each
installation. The sound levels produced by all equipment must be suitably treated by room acoustic
treatment, discharge and inlet air attenuations, exhaust mufflers etc to meet sound pressure levels as
stated below. Fan static and exhaust backpressure limits must be considered when the noise
control system is designed. The sound pressure levels (SPL) of the complete installation running
at full load should not exceed 85 dab measured at any point 7 meter from any discharge or inlet
opening
General
Following documents should be submitted with the offer.
a) Manufacturer’s technical literature for engine
b) Manufacturer’s technical literature for alternator
c) Certificate of compliance to the technical specifications, commercial conditions
d) Performance test certificate
e) ISO 9001 certificate of complete generator manufacture
f) Company profile (including the details of installed gen set with same capacity only)
g) 24 hours breakdown service availability

9. Following documents should be submitted with the generator (in case of award the tender)
a) Circuit diagrams of control panel
b) Engine wiring diagrams
c) Operation & maintenance manual of engine and alternator
d) Manufacturer’s factory test certificate for engine and alternator
Warranty
All equipment shall be guaranteed for a period of 48 months or 2000 operating hours from the date
of commissioning.
Generator Earthing system
Generator earth to be provided as per the standards and earth resistance should be less than 10
Ohms.
Load Testing
Contractor should able to conduct full load test for each Gen set to be supplied as appropriate.
The test shall be done as follows.
Load Time
25% 15 (min)
50% 15 (min)
75% 15 (min)
100% 15 (min)
The above tests and checks shall be carried out in the Dealer’s Facility/Site and test certificates
issued by an approved Testing Authority. Further Contractor should conduct and coordinate
presentations, workshops, awareness programme as appropriate to technical crew.