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) 1No. Set of safety controls
ii) 1No. Solenoid valve
iii) 1No. Oil ignition system
iv) 2No. 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.
1.1.7 BULK OIL STORAGE TANK
The bulk oil storage tank nominal capacity of 10,200 litres and complying with BS 799 part 5: 1975 shall be positioned on three concrete cradles.
The works shall include supply, delivery, assembling, erection, testing, commissioning and setting to work. The tank is to be of welded mild steel type with a design pressure of 40KN/m2 and storage temperature of 240 C. It is to be located adjacent to the incinerator and boiler house.
The tank shall be cylindrical with dished end and be constructed of 6mm thick block mild steel plates in accordance with BS 1966. Number one quality galvanised materials shall not be used.Welded construction parts shall be sprayed.
The tank shall be pressure tested with a total head of water or equivalent, measured from the base of the tank, and equal to 1½ times the sum of:
(i) The height of the tank and
(ii) The design head above the top of the tank that is 3.5m of water.
The pressure shall be raised slowly and steadily until the specified test pressure is reached and that pressure shall be maintained for a period long enough to permit a thorough examination to be made to ensure that the tank is sound enough and shows no leaks or undue distortion. Welded joints shall be radiographed and a certificate issued. Should any defects be found, they shall be made good and the test procedure repeated until the tank is certified to be sound. The tests shall be carried out in the presence of the Engineer and subsequently, the sub-contractor will provide the Engineer with the test certificate.
The tank shall then be cleaned externally and provided with rust inhibiting primer before applying 2No. coats of bituminous paint. The inside shall also be cleaned and purged of any foreign matter before setting to work.
Ladders and platforms shall be thoroughly cleaned and freed from rust and scale and painted with a priming coat of approved paint.
The tank shall be provided with the following:-
(i) 450mm bolted inspection covers with liquid and vapour tight joint made with a gasket of fuel resistant materials.
(ii) 75mm (3”) vent socket screwed B-SP and pipe at the higher end of the tank with an unloading device to prevent the rise in tank pressure above the design pressure. The vent pipe shall be free from bends and shall have a continuous rise while being as short as convenient. It shall terminate in open air in a position where it cannot be tampered with. The open end shall be turned down and fitted with an open mesh wire cage.
(iii) 65mm diameter filling pipe with hose coupling connection
(iv) 50mm diameter gauging connection with lockable cap.
(v) 50mm diameter supply pipe
(vi) 25mm diameter water drain-off value
The tenderer shall supply hydrostatic oil contents gauge (level indicator) or a
properly calibrated stick (of dip tape) and access ladder to the top of the tank.
The filling pipe shall be extended inside the tank to within 150mm of tank bottom,
complete with anti-siphoning device.
The following information shall be permanently and clearly marked on the tank on the
centre line near the outlet connection.
• Gross capacity in litres
• Test pressure
• Date of test
• Maximum allowable working pressure
• Manufacturer’s name of trade mark
• Year of manufacture
• The number of British standard and type of tank
The tank shall be installed with a 25mm fall towards the water drain-off tapping point. The supply socket shall be extended inside the tank to prevent ingress of water in the supply line. The main contractor shall construct tank supports and bund walls to detail drawings produced by the sub-contractor. A valued drain off from the lowest part of the tank shall be provided complete with tail pipe and a provision for hose connection.
1.1.8 TRANSFER HAND PUMP
A semi rotary hand pump shall be provided for filling the day storage tank from the oil drum. It shall be installed complete with all the necessary plumbing fittings and accessories.
1.1.9 DAILY SERVICE TANK
A daily storage tank of nominal capacity 1,800Litres shall be mounted at 2.5 metre high level in the incinerator room. Tank shall be manufactured from 6mm thick pressed steel plates of 1220mm x 1220mm black mild steel sheet, complete with bolted cover and adequate venting. The tank shall conform to BS 799 part 5 1995 and be provided with a contents sight tube. The tank shall be lagged with 50mm thick fibre glass insulation of 0.4W/m2 thermal conductivity and finished with 20SWG galvanized sheets cladding.
The tank shall be tested for any leaks of which if any is detected will be made good before the tank is painted externally with rust inhibiting paint. Tank to be securely bolted.
1.1.10 AUXILLIARY EQUIPMENT
All pipework used in the oil storage systems shall be to B.S. 1387 heavy grade. Joints shall be screwed, and sufficient unions must be provided to allow easy dismantling the equipment.
A 25mm diameter fire valve of the quick action lever operated dead weight type shall be installed, in the oil flow line. This shall be held in the open position by a light gauge steel cable attached to a fusible link. The fusible link shall be mounted directly over the burner. The warm burner oil feed pipe from the high level day tank shall be heated by an electric tracing tape properly wrapped around the pipe. The pipe shall then be insulated with 25mm thick fibre glass insulation and finished with gauge 22swg galvanized steel sheet.
The supply pipe from the bulk oil storage tank to the high level day has been installed by others but the tenderer shall allow for connection to the high level day tank. The tenderer shall also supply and install high capacity strainers along the supply pipe and the burner feed pipe.
1.1.11 PIPE SUPPORTS
The variety and type of supports shall be kept to a minimum and their design shall be such as to facilitate guide and secure fixing to match concrete masonry or wood.
Consideration shall be given when designing supports to the maintenance of desired pipe fall and the restraining of pipe movements to a longitudinal axial direction only.
The sub-contractor shall supply and install all steel work forming part of pipe support assemblies and shall be responsible for making good any damage to builders work associated with builders work installation.
Pipe runs shall be secured by clips connected to pipe hangers, wall brackets or trapeze type supports. ‘U’ bolts shall not be used for clips without prior approval of the Engineer.
The sub-contractor shall submit his entire proposal for the pipe supports to the Engineer for approval before any erection work commences.
1.1.12 ELECTRICAL WORKS
All wiring between items, plant and controls shall be executed by the tenderer. The tenderer shall provide adequate supervision to ensure that electrical connections are correctly made to all items of equipment and controls supplied by him, all to the Project Manager’s / Engineer’s satisfaction.
1.1.13 INCINERATOR TESTING AND COMMISSIONING
The tenderer shall test and commission the incinerator in the presence of the Engineer.The tenderer shall also provide sufficient oil to last at least two (2) hours. The tenderer shall test and commission the incinerator in the presence of the Engineer and verify that the incinerator is functioning according to the specifications laid here-in and in the catalogues and manuals from the suppliers of he incinerator.The incinerator performance test shall be carried out in accordance to BS3316: part 4:1987.Should any defect be detected, it shall be rectified and the testing process repeated to the Project Manager’s satisfaction.
1.1.14 FIRE INSTRUCTION NOTICE
Proceed and procure and install as below;
Print fire instruction on the Perspex plate, 3mm thick with White Colour
Background measuring 510mm lengthx380mm width as follows;