DESCRIPTION OF WORKS
The services and equipment described in this specification comprises the supply, delivery, installation, testing and commissioning of an incinerator and the associated accessories including oil installation at the Hospital.
The tenderer is to ensure that the equipment they proposes to supply is from a reputable manufacturer with full spare back-up and can be serviced and maintained by locally available personnel and is not of such a nature as will require overseas expertise to attend to its maintenance and servicing.
The tenderer shall include for all items not called for in this specification but which are necessary for the completion, safety and satisfactory functioning of the works. The installation and components are to comply with all the requirements of the local authority’s bye-laws, regulations of water and fire brigade authorities and the latest Kenya Bureau of Standards, British standard specifications and codes of practice or equivalent approved international standards and National Environment Management Authority (NEMA) Regulations.
The tenderer shall be deemed to have visited the site to ascertain the site conditions.
1.0.3. SCOPE OF WORKS
The works comprise the supply delivery, installation, testing and commissioning of 1No. Incinerator, complete with associated accessories including flue and oil installation. The oil installation shall comprise bulk oil storage tank, daily oil tank, transfer hand fuel pump and the associated pipework. The burning capacity of the incinerator shall be 75kg of hospital waste per hour as NU-WAY LTD models or equal and approved.
The incinerator will have a primary and a secondary combustion chamber, temperature indicators, burners operation and safety controls and a suitable flue (chimney).
1.0.4 COMMENCEMENT OF WORK
The tenderer in submitting his tender shall be deemed to have included for commencing any necessary work and other expenses which may be incurred by the tenderer including travelling to site. No claims will be allowed for the traveling or other expenses which may be incurred by the tenderer.
1.0.5 CLIMATIC CONDITIONS
The following climatic conditions apply to the site of the contract works and plant, equipment, apparatus and installation shall be suitable for these conditions.
Maximum Design Temperature
41 – 59.7%
Heavy rains fall during certain periods of the year and the tenderer shall be deemed to have taken into account of this fact both in his prices and planning of the execution of the works.
1.1.0 THE EQUIPMENT AND PLANT
The incinerator shall have chimney, castable high quality refractory lining and incinerator shell, perforated blind for the primary and secondary combustion chambers and air circulation system.
The incinerator shall also have the following:-
- Ash door
- Primary and secondary burners and fans
- Temperature indicator devices
- Electrical wiring from the local isolator
- FD fan
- Air receiver
- Air ductwork complete with air dampers
- Pressure and temperature gauges
- Fully wired control panel
The bulk oil storage tank shall have a capacity of 10,200 litres and be placed at 0.5m above ground on a firm concrete cradle, complete with the following:-
- Drain pipe
- Vent pipe
- Oil level indicator
- Access ladder to the top of the tank
- Coating of the tank with at least 2No. coats of bituminous paint
- Manhole cover complete with a gasket
- Dip stick
- Any other necessary accessory.
The daily oil tank of capacity 1,800 litres and size 1220x1220x1220mm pressed steel tank high shall be placed 2.5 metres high above finished floor level on a steel stand, firmly secured on the ground and the steel members to be bolted. The daily oil tank shall have an oil level indicator, access manhole, washout, overflow, inlet and outlets connections and gate valves.
The interconnecting pipe of 50mm diameter between the two tanks shall be class ‘C’ black mild steel pipe, complete with a 50mm diameter strainer. The burner fuel supply pipe from the daily tank shall be a 25mm diameter class ‘C’ black mild steel.
The following shall also be supplied
- 25mm diameter fire valve
- 25mm diameter high capacity strainer
- heating tap along the burner supply pipe, 25mm diameter
The burner supply pipe shall have 25mm thick fibre glass insulation and finished with gauge 20SWG galvanised steel sheet.
The tenderer shall provide all the necessary controls for proper safety and satisfactory working of the installation.
The burner shall be suitable for 35 sec redwood No. 1 scale fuel oil. It shall be robust in construction and be manufactured in cast iron or other suitable materials complete with mounting plates. It must be easily mountable and demountable for ease of cleaning and maintenance. The burner shall have an adequate supply of oil which will readily ignite and burn in a safe manner. Adequate provision shall be provided to prevent any solid matter in the oil, or any matter that may separate out from the oil from damaging any components or chocking of any orifices or valves. The free filtering area should be sufficient to ensure that the filter does not need dismantling for cleaning more often than once a year. The burner shall have flame supervision by photo-electric cell with synchronous sequence controller for automatic start up, running and shut-down of the burner.
The burner shall have all the necessary controls e.g.Solenoid valves, ignition controls, photo electric cell fuel safety controls, low pressure fuel supply cut-off etc.
The burner shall conform to BS 799: part 3 and 6 1981 or any other relevant British standard.The burner shall be as NU-WAY models or equal and approved.
The incinerator shall operate in an automatic manner with all the necessary controls. These controls are to include safety elements such as flame failure unit, pilot lamps, fuses, starters, overload contactors, ON and OFF switches for burners and fans, combustion chamber temperature indicators for primary and secondary chambers etc.
- i) Electric ignition switch ‘ON’ before the oil is supplied
- ii) Delayed return to re-start position to allow purging
iii) Re-start after temporary electric supply failure
- iv) Positive safety lock-out in case of flame failure from whatever cause.
- v) Red signal light on control panel to indicate safety lock out
- vi) Photo electric protective cell as flame failure device.
The controls shall be mounted on suitable control panel to be installed in a position easy to read and control from the charging door side of the incinerator.
The control panel shall be fabricated from anodized, 16SWG, mild steel sheet.
1.1.3 FLUE (CHIMNEY)
A flue chimney, 15,000mm long and 560mm diameter shall be constructed from steel sheet, complete with lagging, damper and rain water protection cone. The chimney shall be lined with castable grade diatomaceous concrete mixed with high alumina cement in accordance with BS 4076: 1989.
The damper will control the closing of the door to not less than 85%. The stack is to allow fresh air at the stock’s base so that the flue gases are discharged at not move then 4000 C and that the discharge conforms to the British Clean Air Act, the National Environment Management Agency (NEMA) Act or other relevant acts. .
1.1.4 POWER SUPPLY
The sub-contractor shall supply equipment which are suitable for running on a 415V, 3 phase, 50HZ or 240V, single phase, 50HZ electric power supply.
1.1.5 OIL STORAGE AND SUPPLY
The system shall consist of a bulk oil storage tank, daily tank, transfer hand fuel pump and associated pipe work. Oil from the bulk storage tank will be delivered to a high level daily tank situated in the incinerator room by use of a transfer hand pump and automatic electric pump.
1.1.6 SPARES AND MANUALS
The tenderer is to submit with his tender a list of recommended initial stock of spares together with their prices. A part from the burner spares mentioned here below, the spares prices are not to be included in the main summary of prices schedule but is to be separate and are meant to be ordered later if and when it becomes necessary and convenient to the client. The burner spares whose prices are to be included in the main summary of prices schedule (BQ) are:-
- i) Set of safety controls
- ii) Solenoid valve
iii) 1No. Oil ignition system
- iv) Photo-electric cells
Two sets of operating and maintenance manuals (both for the incinerator and burners) must also be supplied. This include two sets of control schematic diagrams for all the controls and wiring.