500kva Diesel Generator Set- Comments For Cummins Dg Set .pdf 5t614d
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NCC Kenya Engineers.
500KVA Diesel Generator Set Comments for Cummins DG set Commentsreg VESTA < [email protected]> Thu, Sep 10, 2015 at 9:15 PM To: [email protected], "NCC Kenya Engineers."
Cc: sridhar ganesan
, RAVI CHANDRAN
11.5.2 Silencer : length of the cylinder : 2092mm, height of the cylinder : 664mm with a flange to connect the flexible bellow. The silencer cylinder is mounted on top of the canopy. Flexible steel bellow connects the engine turbo and the silencer flange. Steel flexible bellow acts as anti vibration between the engine and the silencer. There is a provision of flange at the other end of the silencer to connect extended pipes.
NCC Response: Noted.
11.5.9 Extended pipes, stack, manifolds is not in the consider in the scope of supply will need very specific details like length, bends, pipe dimensions, thickness etc. manifolds will again need details of the materials angles, structure details with dimensions. NCC Response: Provide as per Tech. Specification.
Cladding is not done on the silencer provided. If required materials will be supplied, though cladding will need to be done at site. Will need details of the materials sheet details with dimensions quantity of wool required. It would mainly depend on the length of the stack. NCC Response: Provide as per Tech. Specification.
Silencer is of AL Steel in the external and MS in the internal. If the silencer required it to be of SS. Will need to be done as a special order basis will take time and cost extra. Not a general practice or a standard product. NCC Response: Provide stainless steel for silencer material instead of Al, steel & MS steel.
design, furnishing the materials and installation of all ing steel, rigid duct s, sliding s, expansion ts and insulation needed in conjunction with the exhaust system : Deg will depend on the site condition or detailed engineering discussion : can be organized for site visit / discussion at an extra cost. materials can be availed will be able to quote after the deg. NCC Response: Please include in your offer.
11.5.3 : basic cummins design for the base tank is 750 ltrs. Design approval will be required to alter the tank capacity will also depend on the space availability between the base frame for the base tank. Alterations even if possible will be at an extra cost. NCC Response: Noted.
Suggestion : additional external tank of 990 ltrs to be connected through external hose to the base tank. To refill the base tank. There are no separate alarms. Low fuel level sensor is connected to the controller for warning. Will need to consult design dept for any possibility for high / low fuel alarm switches Filter is provided between the input hose. There is no sight glass on the tank There are no fire shut off valves : will need to be installed separately, please provide technical details of the valve. The fire sensor and its operation logic. . Direct motor driven selfpriming gear type booster pumps shall be provided (if required) to guarantee the maximum required fuel flow under all circumstances.: Cummins PT fuel pump is installed to pump fuel from day tank to injectors.
fuel oil purge pumps with alternative connection facilities provided for road tanker : can supply at an
additional cost.
NCC Response: Please include in your techno commercial offer.
A fill point cabinet shall be provided. The cabinet shall be of mild steel construction with a lockable door and shall include a contents gauge, a flanged valve, cap and chain : the base tank has a fuel inlet provision with a normal cap inside the DG canopy a guage installed besides the inlet. Please specify exact details with dimensions and drawings for the cabinet and the flanged valve. And how and where would it be installed. NCC Response: Provide as per IEC standards
11.5.4. An integral fuel system shall be provided for the diesel engine consisting of injectors, metering pumps and duplex filtration equipment which shall be of the replaceable element type, complete with changeover device and pressure difference indicator : Cummins PT fuel pump is installed to pump fuel from day tank to the injectors. Fuel filter is provided. Please provide details / specs of metering pumps and duplex filtration equipment… NCC Response: Provide as per IEC standards
steel drip tray on the diesel generator room floor in front of each unit. : can be supplied at an additional cost. will need exact dimension and thickness of the tray with exact drawing for fabricating and how and where would it be placed. NCC Response: Please include in your techno commercial offer.
11.5.5. Engine governing : Electronic / A1 class governor is installed in the engine On return of the mains supply it is anticipated that the load will be removed from the diesel generator at a similar rate : it is a auto function. All electric motors will be direct on line started: u will need to consider the initial starting current. 11.5.6. Cooling equipment The diesel generator unit supplied shall have an air cooled radiator and engine driven fans arranged : both air cooled and radiator cooled doesn’t make sense. The engine is radiator cooled / water cooled the Combustion air intake @ 100% load is 37 m3/min Thermostatically controlled electrical heaters shall be installed in the engine jackets to maintain the water temperature at a minimum of 10°C under standby conditions. : no provision of heater. External space heaters can be installed at extra price. though controlling the temperature will need a system all together and continuous heating will also be a concern. NCC Response: Provide heaters to maintain minimum teperature of 10 deg C as per technical specification.
low water level detection equipment complete with relays shall be fitted to the generator unit : low coolant level is not installed in 500kva : if required will need to make provision and also design the system for reading and warning. NCC Response: Provide as per Tech. Specification.
11.5.7. Starting equipment The diesel generator shall be provided with an emergency starting air receiver sized to provide ample storage to allow at least 12 consecutive starts without repressurizing between starts. The air receivers shall be constructed in accordance with the ASME code for unfired pressure vessels, or equivalent. Three (3) compressors arranged in parallel shall be provided for the diesel generator units. These compressors shall be low capacity, high discharge pressure, reciprocating multistage machines. Two compressors shall be motor driven and the third (back up) compressor shall be driven by a battery
start diesel engine with provision for manual cranking. The maximum air pressure for the starting air system shall be 30 bars. Each compressor shall be capable of charging one receiver in one hour or less. The two motor driven compressors shall be controlled by an automatic start/ stop controller which starts the compressor on a preset low receiver pressure and stops the compressor when the air pressure reaches the desired maximum level. Alarm indication of low pressure shall be provided in the Central Control Room. There is no consideration for any external compressor system. the same can be provided as an external cost. though will need complete details of the equipment and the integration with the engine system details.
NCC Response: Provide three(3) compressors arranged in parallel as per Tech. Specification.
11.5.8. Intake air system The diesel generator shall be provided with the following air filtration equipment. A 100 per cent capacity selfcleaning inertial type separator a. A 100 per cent capacity selfcleaning automatically rotated, viscous impingement filter. The above equipment shall be mounted as high as possible above the ground with provision to ensure the equipment can be serviced easily. The above equipment has not been quoted, can provide at an extra cost. Sound attenuators, which properly reduce the turbocharger noise within the specified limits, shall be provided. The entire system is housed inside the canopy wherein the overhaul sound is reduced to 75db. Separate acoustic for the tourbo charger is not considered. If still needed please provide specific details and design. NCC Response: Provide as per specification requirement.
11.5.11. Barring device A barring device shall be provided to rotate the engine shaft for engine adjustment and repair purposes. The engine manufacturer shall determine whether the device is power or manually operated. An interlock shall be provided to prevent the starting of the diesel while the barring device is engaged The above equipment has not been quoted, can provide at an extra cost. If needed please provide specific details and design. NCC Response: Please include in your techno commercial offer.
11.5.12. Operation of the generating plant The set shall be complete with auxiliary equipment required to operate the set locally as well as from the SCS via its associated control console in the Substation Control Room. : will need details of the SCS controls. the DG controller can accept command for remote start stop. The external console should be able to send appropriate signals for the operations. NCC Response: Noted
The emergency generator set shall be connected to the LVAC switchboard as shown on single line diagram in Appendix A. During emergency conditions the generator breaker may be manually or automatically closed either locally or remotely. Proper command will be required to operate the Breaker. NCC Response: Noted.
Controls shall be provided to synchronize (manually or automatically) and load each generator. AMF
is only single or based fully functional changeover function has not been considered NCC Response: Noted.
The generators shall be capable of being started, synchronized to the system without dependence upon the substation ac auxiliary supplies : synchronized ? will need details of the exact requirement. NCC Response: As per specification DG Set started with dependence of substation ac auxiliary supplies.
and accepting load within 10 seconds after receiving start signal. yes
With initiation of stop signal the unit shall shut down in an orderly manner. yes Operation of the generator protective devices shall trip a lockout relay no lockout relay is provided which in turn shall open the generator circuit breaker and cause a set shut down. Genset shutdown command will be a separate logic. Failure of starting sequence shall automatically shut down and make insensitive any further start signals until the fault has been corrected.yes Active and reactive load sharing with other machines and load control, speed, voltage and VAR control shall be provided. No load manager or load sharing is provided. NCC Response: Provide Load Control, Speed, Voltage & VAR control signal as per technical specification.
11.5.14. Generating set protection : will need to confirm NCC Response: Provide as per Tech. Specification.
14.15 Generator control Generator control shall be PLC operated to SCS. Will need complete details of SCS
NCC Response: Details furnished during detailed engineering stage.
Regards Debo +919820385529
Vesta Engineering Mumbai Office: A‐301, Vikas Commercial, Bhakti Marg, Behind Vikas Paradise, Mulund (W), Mumbai ‐ 400080 022‐27697304/5
From: [email protected] [mailto: [email protected]] Sent: Thursday, September 10, 2015 9:06 PM To: Lucsam; VESTA Subject: Fw: 500KVA Diesel Generator Set Comments for Cummins DG set Commentsreg With warm regards, Sanjib Sarkar, Nairobi, Kenya. Sent from my BlackBerry port @ Airtel Premier Africa
From: NCC Kenya Engineers.
Sent: Thursday, September 10, 2015 4:00 PM To: Sanjib Sarkar Cc: Lucsam; sridhar ganesan; RAVI CHANDRAN Subject: Fwd: 500KVA Diesel Generator Set Comments for Cummins DG set Commentsreg [Quoted text hidden]
500KVA Diesel Generator Set Comments for Cummins DG set Commentsreg VESTA < [email protected]> Thu, Sep 10, 2015 at 9:15 PM To: [email protected], "NCC Kenya Engineers."
11.5.2 Silencer : length of the cylinder : 2092mm, height of the cylinder : 664mm with a flange to connect the flexible bellow. The silencer cylinder is mounted on top of the canopy. Flexible steel bellow connects the engine turbo and the silencer flange. Steel flexible bellow acts as anti vibration between the engine and the silencer. There is a provision of flange at the other end of the silencer to connect extended pipes.
NCC Response: Noted.
11.5.9 Extended pipes, stack, manifolds is not in the consider in the scope of supply will need very specific details like length, bends, pipe dimensions, thickness etc. manifolds will again need details of the materials angles, structure details with dimensions. NCC Response: Provide as per Tech. Specification.
Cladding is not done on the silencer provided. If required materials will be supplied, though cladding will need to be done at site. Will need details of the materials sheet details with dimensions quantity of wool required. It would mainly depend on the length of the stack. NCC Response: Provide as per Tech. Specification.
Silencer is of AL Steel in the external and MS in the internal. If the silencer required it to be of SS. Will need to be done as a special order basis will take time and cost extra. Not a general practice or a standard product. NCC Response: Provide stainless steel for silencer material instead of Al, steel & MS steel.
design, furnishing the materials and installation of all ing steel, rigid duct s, sliding s, expansion ts and insulation needed in conjunction with the exhaust system : Deg will depend on the site condition or detailed engineering discussion : can be organized for site visit / discussion at an extra cost. materials can be availed will be able to quote after the deg. NCC Response: Please include in your offer.
11.5.3 : basic cummins design for the base tank is 750 ltrs. Design approval will be required to alter the tank capacity will also depend on the space availability between the base frame for the base tank. Alterations even if possible will be at an extra cost. NCC Response: Noted.
Suggestion : additional external tank of 990 ltrs to be connected through external hose to the base tank. To refill the base tank. There are no separate alarms. Low fuel level sensor is connected to the controller for warning. Will need to consult design dept for any possibility for high / low fuel alarm switches Filter is provided between the input hose. There is no sight glass on the tank There are no fire shut off valves : will need to be installed separately, please provide technical details of the valve. The fire sensor and its operation logic. . Direct motor driven selfpriming gear type booster pumps shall be provided (if required) to guarantee the maximum required fuel flow under all circumstances.: Cummins PT fuel pump is installed to pump fuel from day tank to injectors.
fuel oil purge pumps with alternative connection facilities provided for road tanker : can supply at an
additional cost.
NCC Response: Please include in your techno commercial offer.
A fill point cabinet shall be provided. The cabinet shall be of mild steel construction with a lockable door and shall include a contents gauge, a flanged valve, cap and chain : the base tank has a fuel inlet provision with a normal cap inside the DG canopy a guage installed besides the inlet. Please specify exact details with dimensions and drawings for the cabinet and the flanged valve. And how and where would it be installed. NCC Response: Provide as per IEC standards
11.5.4. An integral fuel system shall be provided for the diesel engine consisting of injectors, metering pumps and duplex filtration equipment which shall be of the replaceable element type, complete with changeover device and pressure difference indicator : Cummins PT fuel pump is installed to pump fuel from day tank to the injectors. Fuel filter is provided. Please provide details / specs of metering pumps and duplex filtration equipment… NCC Response: Provide as per IEC standards
steel drip tray on the diesel generator room floor in front of each unit. : can be supplied at an additional cost. will need exact dimension and thickness of the tray with exact drawing for fabricating and how and where would it be placed. NCC Response: Please include in your techno commercial offer.
11.5.5. Engine governing : Electronic / A1 class governor is installed in the engine On return of the mains supply it is anticipated that the load will be removed from the diesel generator at a similar rate : it is a auto function. All electric motors will be direct on line started: u will need to consider the initial starting current. 11.5.6. Cooling equipment The diesel generator unit supplied shall have an air cooled radiator and engine driven fans arranged : both air cooled and radiator cooled doesn’t make sense. The engine is radiator cooled / water cooled the Combustion air intake @ 100% load is 37 m3/min Thermostatically controlled electrical heaters shall be installed in the engine jackets to maintain the water temperature at a minimum of 10°C under standby conditions. : no provision of heater. External space heaters can be installed at extra price. though controlling the temperature will need a system all together and continuous heating will also be a concern. NCC Response: Provide heaters to maintain minimum teperature of 10 deg C as per technical specification.
low water level detection equipment complete with relays shall be fitted to the generator unit : low coolant level is not installed in 500kva : if required will need to make provision and also design the system for reading and warning. NCC Response: Provide as per Tech. Specification.
11.5.7. Starting equipment The diesel generator shall be provided with an emergency starting air receiver sized to provide ample storage to allow at least 12 consecutive starts without repressurizing between starts. The air receivers shall be constructed in accordance with the ASME code for unfired pressure vessels, or equivalent. Three (3) compressors arranged in parallel shall be provided for the diesel generator units. These compressors shall be low capacity, high discharge pressure, reciprocating multistage machines. Two compressors shall be motor driven and the third (back up) compressor shall be driven by a battery
start diesel engine with provision for manual cranking. The maximum air pressure for the starting air system shall be 30 bars. Each compressor shall be capable of charging one receiver in one hour or less. The two motor driven compressors shall be controlled by an automatic start/ stop controller which starts the compressor on a preset low receiver pressure and stops the compressor when the air pressure reaches the desired maximum level. Alarm indication of low pressure shall be provided in the Central Control Room. There is no consideration for any external compressor system. the same can be provided as an external cost. though will need complete details of the equipment and the integration with the engine system details.
NCC Response: Provide three(3) compressors arranged in parallel as per Tech. Specification.
11.5.8. Intake air system The diesel generator shall be provided with the following air filtration equipment. A 100 per cent capacity selfcleaning inertial type separator a. A 100 per cent capacity selfcleaning automatically rotated, viscous impingement filter. The above equipment shall be mounted as high as possible above the ground with provision to ensure the equipment can be serviced easily. The above equipment has not been quoted, can provide at an extra cost. Sound attenuators, which properly reduce the turbocharger noise within the specified limits, shall be provided. The entire system is housed inside the canopy wherein the overhaul sound is reduced to 75db. Separate acoustic for the tourbo charger is not considered. If still needed please provide specific details and design. NCC Response: Provide as per specification requirement.
11.5.11. Barring device A barring device shall be provided to rotate the engine shaft for engine adjustment and repair purposes. The engine manufacturer shall determine whether the device is power or manually operated. An interlock shall be provided to prevent the starting of the diesel while the barring device is engaged The above equipment has not been quoted, can provide at an extra cost. If needed please provide specific details and design. NCC Response: Please include in your techno commercial offer.
11.5.12. Operation of the generating plant The set shall be complete with auxiliary equipment required to operate the set locally as well as from the SCS via its associated control console in the Substation Control Room. : will need details of the SCS controls. the DG controller can accept command for remote start stop. The external console should be able to send appropriate signals for the operations. NCC Response: Noted
The emergency generator set shall be connected to the LVAC switchboard as shown on single line diagram in Appendix A. During emergency conditions the generator breaker may be manually or automatically closed either locally or remotely. Proper command will be required to operate the Breaker. NCC Response: Noted.
Controls shall be provided to synchronize (manually or automatically) and load each generator. AMF
is only single or based fully functional changeover function has not been considered NCC Response: Noted.
The generators shall be capable of being started, synchronized to the system without dependence upon the substation ac auxiliary supplies : synchronized ? will need details of the exact requirement. NCC Response: As per specification DG Set started with dependence of substation ac auxiliary supplies.
and accepting load within 10 seconds after receiving start signal. yes
With initiation of stop signal the unit shall shut down in an orderly manner. yes Operation of the generator protective devices shall trip a lockout relay no lockout relay is provided which in turn shall open the generator circuit breaker and cause a set shut down. Genset shutdown command will be a separate logic. Failure of starting sequence shall automatically shut down and make insensitive any further start signals until the fault has been corrected.yes Active and reactive load sharing with other machines and load control, speed, voltage and VAR control shall be provided. No load manager or load sharing is provided. NCC Response: Provide Load Control, Speed, Voltage & VAR control signal as per technical specification.
11.5.14. Generating set protection : will need to confirm NCC Response: Provide as per Tech. Specification.
14.15 Generator control Generator control shall be PLC operated to SCS. Will need complete details of SCS
NCC Response: Details furnished during detailed engineering stage.
Regards Debo +919820385529
Vesta Engineering Mumbai Office: A‐301, Vikas Commercial, Bhakti Marg, Behind Vikas Paradise, Mulund (W), Mumbai ‐ 400080 022‐27697304/5
From: [email protected] [mailto: [email protected]] Sent: Thursday, September 10, 2015 9:06 PM To: Lucsam; VESTA Subject: Fw: 500KVA Diesel Generator Set Comments for Cummins DG set Commentsreg With warm regards, Sanjib Sarkar, Nairobi, Kenya. Sent from my BlackBerry port @ Airtel Premier Africa
From: NCC Kenya Engineers.
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