HVAC
The works covered by this specification consists of supply, delivery, off-loading, installation, testing, commissioning and One year's maintenance and guarantee of the Air Conditioning & Ventilation equipment. In general this shall include but not be limited to the following:
a) Supply and Installation of Fan Coil Units complete with all accessories to capacities shown on the Drawings and or Schedules.
b) Supply and Installation of Air Handling Units to capacities shown on the Drawings or Schedules.
c) Supply and Installation of all Supply and Return Air Ductwork complete with diffusers, flexible ducts, fire dampers etc as specified and as shown on the drawings.
d) Supply and Installation of Toilet Ventilation System as shown on the drawings and as specified, complete with fans and controls.
e) Vibration and Sound Attenuation for all equipment, piping and ductwork as specified to ensure that all sound levels are within acceptable levels whether specified or not.
f) Supply and installation of all Air Conditioning Switchboards, and Sub-boards for the various systems complete with all accessories and controls.
g) Balancing, testing and commissioning of the whole installation and providing all testing and commissioning data.
h) This Contractor shall carry out any other incidental works or supply and install accessories not specifically mentioned but considered necessary to bring the whole installation to proper and satisfactory working order.
Compliance with Manufacturer’s Specification
The Contractor shall ensure that all equipments and accessories used in the installation shall be suitable for the work to be performed and that the loading of equipment shall not exceed the maximum capacity specified or agreed in writing by the Manufacturer.
The Contractor shall be responsible for the inspection of all equipment and accessories before their incorporation in the Work and to ensure that they comply fully with the requirements of the specification and that they are not defective in any way as regards to materials or workmanship. Should any such non-compliance and defects be found in the course of the works, the Contractor shall correct or cause to be corrected such non-compliance to the specifications and/or the defects all at his own expense and to the satisfaction of the S.O.
Tropicalisation
The Contracts Works shall be installed in tropical conditions below 1 000 metre altitude in Malaysia
All the equipment and materials offered shall be fully tropicalised and suitable for continuous trouble free operation under adverse climatic conditions of heavy thunderstorm and rain, high humidity, intense sunlight and ambient air temperature of up to 40O centigrade.
In choosing materials and their finishes due regard is to be given to the humid tropical conditions under which the equipment is to work. Some relaxation of the following provisions may be permitted where equipment is hermetically sealed but it is preferred that tropical grade materials should be used wherever possible.
i. Materials - Iron and steel shall be painted or galvanised as appropriate.
Indoor parts may alternatively have chromium or copper-nickel plated or other approved protective finish.
Steel iron and steel parts (other than rustless) of all instruments and electrical equipment, the cores of electro-magnets and the metal parts of relays and mechanism shall be treated in an approved manner to prevent rusting.
Cores etc. which are built up of laminations or cannot for any other reason be antirust treated, shall have all exposed parts thoroughly cleaned and heavily enamelled lacquered or compounded.
Where it is necessary to use dissimilar metals in contact, these shall, if possible, be so selected that the potential difference between them in the electro chemical series is not greater than 0.5 volt. If this is not possible, the contact surfaces of one or both of the metals shall be electroplated or otherwise finished in such a manner that the potential difference is reduced to within the required limits, or if practicable than two metals may be insulated from each other by an approved insulating material or coating of approved varnish compound.
ii. Screws, Nuts, Springs, Pivots, etc.
The use of iron and steel shall be avoided in instruments and electrical relays whenever possible.
Steel screws, when used shall be chromium plated or when plating is not possible owing to tolerance limitations, shall be of stainless steel.
All wood screws shall be dull nickel plated brass or of other approved finish.
Instrument screws (except those forming part of a magnetic circuit) shall be of brass or bronze.
Springs shall be non-rusting materials e.g. phosphor-bronze or nickel silver, as far as possible.
Pivots and other parts for which non-ferrous materials are unsuitable shall be of approved rust-less steel where possible.
iii. Fabrics, Corks, Paper, etc.
Fabric, cork, paper and similar materials, which are not subsequently to be protected by impregnation shall be adequately treated with an approved fungicide. Sleeving and fabrics treated with linseed oil or linseed oil varnishes shall not be used.
iv. Wood
The used of wood in equipment shall be avoided as far as possible. When used, wood work shall be thoroughly seasoned teak and other approved wood which is resistant to fungal decay and shall be free from the shales and warp, sap and wane, knots faults and other blemishes.
Woodwork shall be suitably treated to protect it against the ingress of moisture and from the growth of fungus and termite attack, unless it is naturally resistant to those causes of deterioration.
All joints in woodwork shall be dove-tailed or tongued and pinned as far as possible.
Metal fittings where used shall be non-ferrous materials.
v. Adhesives
Adhesives shall be especially selected to ensure the use of types which are impervious to moisture, resistant to mould growth and not subject to the ravages of insects. Synthetic resin cement shall be used for joining wood. Case in cement shall not be used.
Chromium Plating
The chromium plating of those, components of the plant where offered by the Subcontractor shall comply with the requirements of BS 1224.
Cleaning and Plating
Metal work which is normally painted in the factory before despatch shall be prepared by filling in or wire brushing and rubbed down to smooth finish and then given one priming coat, one or more undercoats and one or more top coats of approved paints. The second top coat shall be of the different shade of colour.
Metal work which is normally painted on site shall be prepared as above and given one coat of approved preservation paint before leaving the factory.
Metal work which will be erected in the open shall be given top coats of bitumastic based paint with appropriate approved primer and undercoat.
Where aluminium paint is specified the paint used for the undercoat shall be of the same quality as the top coat but slightly coloured by the addition of washing blue.
The inside of control cubicles, cabinets, etc. where condensation is liable to occur shall be coated with anti-condensation composition.
All bright metal parts shall be covered before shipment with an approved protective compound and protected adequately during shipment to site.
Fixing
Unless otherwise stated, all fixing of brackets and hangers shall be done by means of rawplugs of rawbolts as recommended by the Rawplugs Company of London.
All rawplugs used shall be of the soft metal (white bronze or similar) type. Where receiving holes must be cut, suitable masonry drills shall be used for sizes up to and including 13 mm diameter. For larger sizes ‘Star’ drills or other means of percussion drilling may be used.
An acceptable alternative to above means of fixing, would be the used of ‘Philips Readheads’ or stud guns in which case the manufacturers recommended procedures of operation shall be strictly adhered to.
Rating Name Plates
Each main and auxiliary item of plant is to have permanently attached to it in a conspicuous position a rating of non-corrodible material upon which is to be engraved an identifying name, type or serial number, together with details of the loading conditions under which the item of plant in question has been designed to operate and such diagram plates as may be required by the S.O.
All items of plant are to be provided with a nameplate or label designating in the English Language the service of the particular equipment. The inscriptions are to be approved by the S.O. or as detailed in the appropriate sections of the Specification.
Bases
All angle iron or other bases or supports of metal work are to be constructed in such a manner so as to provide clearance for easy cleaning after the machine is installed.
Nuts, Bolts, Studs & Washers
Nuts and bolts are to be treated with a non seizing compound on the threads.
Fitted bolts shall be a driving fit in the reamered holes they occupy and shall have the screwed portion of such a diameter that it will not be damaged in driving.
Holding Down Bolts
All plant shall be supplied complete with holding down bolts. The Contractor being responsible for their correct alignment and to arrange for them to be built in.
Guards
Moving parts of all machines installed by the Contractor shall be protected by guards to the satisfaction of the S.O., including all parts at high level to which there is no permanent means of access.
Manufacturer’s Technical Details
The Contractor shall supply to the Schedule of Order full and comprehensive manufacturing details for items of plant, to access its technical suitability and application for which it has been offered. This information shall include constructional details, drawing, performance graphs or curves, assembly and test data as may be necessary.