DOCUMENTS REQUIRED (together with the quotations) |
1. Copy of Current Tax Clearance Certificate ITF263 |
2. Proof of Registration with PRAZ or a proof of registration in the form of the Government Gazette or
Certified letter from PRAZ accompanied with a certified receipt from PRAZ.( In the relevant category) |
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TERMS |
1. Clearly State your payment terms. |
2. Clearly state your Bid Validity period. |
3. Clearly state your delivery period. |
PLEASE NOTE: |
ZETDC STANDARD PAYMENT TERMS ARE THIRTY (30) DAYS FROM DATE OF INVOICE (NO ADVANCE PAYMENT BEFORE DELIVERY OF GOODS/SERVICES.
ALL QUOTATION IN US$ WILL BE PAID IN ZWL$ AT THE PREVAILING RBZ INTERBANK RATE ON THE DATE OF PAYMENT |
ZETDC STANDARD QUOTATION VALIDITY PERIOD IS 30 DAYS . |
ZETDC REQUIRES A MAXIMUM DELIVERY PERIOD OF TEN (10) DAYS |
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Failure to abide with above terms will lead to Automatic disqualification of bid. |
Failure to deliver within the stipulated period will result in Automatic cancellation of the order. |
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SUBMISSION OF DOCUMENTS |
All quotations must be enclosed in separate sealed envelopes, endorsed on the outside with the advertised RFQ number, the closing date, time and deposited in the ZETDC Eastern Region, Competitive Quotation Box at the Reception, Cnr, R. Mugabe Way/1st Street, Mutare on or before 10.00am on the closing date notified. |
For further details, please contact The Procurement Administrator on telephone number 020-64682/64636 or on email procurementer@zetdc.co.zw; ljambo@zetdc.co.zw; tchakuwana@zetdc.co.zw; fdnjolomole@zetdc.co.zw |
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SPECIFICATION FOR LINE HARDWARE |
1. Introduction- This Specification covers the manufacture, supply and delivery of line hardware and accessories for electrical distribution system.
2. Standards- Except where otherwise specified or implied, IEC Recommendation or British Standards (BS) where they amplify IEC, shall apply throughout. Any other standard provided the supplier can provide documentary evidence that the standard is equal to or better than the above standards. All tenderer’s correspondence and all descriptions upon drawings, illustrations or instructions shall be in the English language. SI unit of measurements shall be used throughout. The line hardware shall be manufactured to high quality standards. The companies manufacturing the units shall have ISO 9001 or 2 or Standard Association of Zimbabwe Certification and shall submit documentary proof thereof.
3. Detailed Specification General- All the line hardware specified herein shall be of a design suitable for 100mm2 ACSR conductors.
Care shall be taken to ensure that all hardware and fittings supplied constitute complete assemblies. The minimum factor of safety for line hardware incorporated in insulator strings and other related to the guaranteed breaking load shall be 2.5kN.
All materials, whether fully specified herein or not, shall be of first class quality and shall conform with the best modern practice and comply in all respects with these Specifications. All material shall be free from folds, cracks and other exterior and interior defects, which can affect its strength, ductility, durability or ability to function. All materials shall be inspected and tested in full to prove compliance with the requirements of the specifications. The testing shall be carried out according to the relevant standards like: BS 3288 Insulator and conductor fittings for overhead power lines. Part 2: Specifications for a range of fittings. ASTMA 153 Zinc coating (hot-dip) on Iron and Steel Hardware All iron and steel hardware shall be hot-dip galvanised to British or IEC standards. All bolts and nuts shall be made of stainless steel . Type test Certification shall be submitted for all major components certified by an internationally recognised test institute or laboratory, if the Supplier fails to submit such test certificates, the bid is liable to be rejected.
4. Part –1 Conductor Assessories 4.1 Conductor Ties (Wraplock Type)- The conductor ties should be equivalent in all respects to the respective products made by preformed and include a neoprene centre section and groove pad. They shall be suitable in all respects for the indicated usage, to tie conductors to the specified pin insulators.
4.2 Conductor Splices- Conductor splices shall be suitable for joining ACSR Conductors. Splices for conductor size 100mm2 shall be of the twisting or preform type. The failing load of the splice shall be at least 90% ultimate tensile strength of the conductor.
4.3 Conductor Armour Rods- The Armour rods shall be of the preform type and will be used for reinforcing conductors at the supports. Armour rods for conductor 100mm2 ACSR shall be suitable for reinforcing conductors supported on pin insulators.
5. Part 2 –Clamps & Conductor Attachments
5.1 Parallel Groove (PG) Clamps- The PG clamps are to be used for connecting 100mm2 ACSR conductors. The clamps are to be made of Aluminium Alloy with bolts nuts and washers of galvanised steel. The clamps shall be provided with two or more M12 bolts to provide good (tight) connection for conductor temperatures varying between – 100C and 800C. The clamps shall have a layer of oxide inhibiting grease on the inside the groves that will accommodate the conductor.
5.2 Strain Clamps- The strain clamps shall be manufactured from malleable cast iron. They shall be suitable for 100mm2 ACSR conductors. The weight of each unit shall not exceed 3.1kg.
The clamps shall be provided with a clevis for attachment to the disc insulators. Stainless steel pins and split pins and galvanised washers are to be provided for securing the clamp to the insulator. The clamps shall be rated for a minimum failing load of 70kN.
The clamps shall unless otherwise preferably be of the wedge type with 3 sets of bolt clamps for securing the conductor. Due consideration shall be given to cold flow characteristics and contact area requirements of connectors and conductors. Bolts shall be used as clamping devices only and not as current carrying parts. All bolts nuts and washers shall be of high strength stainless steel. When installed, the assembly shall develop a holding force not less than 95% of the ultimate strength of the conductor without causing clipping, or damage to the conductor or any part thereof in accordance with BS 3288. The current carrying capacity of the tension clamp shall be equal to, or better than that of the conductor. The clamps shall be greased to prevent damages to the conductor against corrosion. The clamps shall preferably be suitable for a range of conductor sizes, in order to minimise the number of different varieties.
5.3 Suspension Clamps- These will be used for conductors with diameters ranging from 11mm to 22mm. They shall be suitable for 100mm2 ACSR conductors. They shall be manufactured from malleable cast iron alloy. The minimum failing load shall be at least 70kN. The weight of each clamp shall not exceed 3.0kgs.
5.4 Wide Angle Suspension Clamps- The suspension clamp attachments shall be the same as for the tension clamps. The same conductor cross-section as for the tension clamp shall also apply for the suspension clamp.
The suspension clamp shall be light and free to pivot in the vertical plane. The pivoting centre shall be close to the conductor axis. The conductor groove shall be bell-mouthed at both ends. The groove shall be free of burrs and edges. It shall be tailored to suit the conductor for a turning angle of at least 25%. Clamping pressure on the conductor shall not be applied near the ends of the supporting groove of the clamp where conductor-bending stresses are high. Clamping bolts shall be provided with locking devices. The wide-angle clamps shall be suitable for use for conductor angles between 0 degrees and 25 degrees measured from the straight through axis and have a minimum failing load of 70 kN.
5.5 York Plates-The York shall be suitable for both strain and suspension points. The york plates shall be manufactured from malleable cast iron or mild steel. They shall be hot- dip galvanised. The minimum failing load shall be at least 70kN and the weight of each unit shall not exceed 1.5kgs.
5.6 Clevis Adapters- The clevis adapters shall be made of malleable cast iron to BS310. The minimum failing load shall be at least 70kN. The weight of each Unit shall not exceed 1.2kgs.
5.7 Arcing Horns/Arcing Horn Adapters- The arcing horns shall be suitable for 33kV line and be of mild steel and have the necessary dimensions to reduce, as far as possible, damage when flash-over occurs. The arcing horn on the live end shall have sufficient diameter to prevent the cause of visible corona and/or radio interference.
The arcing horn on the live end of the suspension sets shall withstand a mass of 150kg applied at the tip. The arcing horn adapter shall consist of an extended clevis tongue with single mounting hole suitable for the connecting of 25mm strap arcing horn by means of a single 12 mm bolt. The adapter shall be supplied with a stainless steel pin, washer and split pin. The arcing horns and mounting bolts shall be included included in the scope of supply. The adapters shall be rated for a minimum load of 70kN. The arcing horn adapters shall be made from castings and those made through any welding process will not be accepted.
6. Part 3-General Pole Top Hardware
6.1 Shackle Straps-The 5/8 twisted shackle straps shall be galvanized and shall be manufactured to relevant British Standards.
6.2 Steel Bracing-They shall be manufactured from flat steel and be hot-dip galvanised.
6.3 Wood Pole Washers- The M22 wood pole washers shall be manufactured from Malleable cast iron or mild steel. They shall be dip hot galvanised. The weight of each unit shall not exceed 0.3kgs.
6.4 Cross-arms- All parts shall be hot-dipped galvanised after all burrs are removed.
6.5 Fibre Glass Bracing- They shall be made of flame retardant resin. The ultimate tensile strength shall be at least 20 kN (2000 Kg force).
6.6 Spindles- All spindles and related parts shall be hot dip galvanized
6.7 Pole Top Brackets These shall be used for 33kV lines. The dimensions are as shown on attached drawing. The pole top brackets shall be manufactures from flat bar cold bending during manufacture is not permissible. The pole top brackets shall be hot-dip galvanised to SABS 763.
7. Part 4 Stays & Accessories
7.1 General The stay shall be 3/4” stay complete Stays shall be supplied complete with the following
a) Stay plate b) Stay washer c) Stay rod d) Stay thimble e) Stay bow
The complete stays shall be made according to the latest revision of relevant British Standard Specification were available. The stay rods, stay bows, base-plates and washers shall all be made of mild steel. All parts shall be hot-dipped galvanised after all burrs are removed.
7.2 Base Plate- Base plates shall be manufactured from mild steel plates and be hot dip galvanised. The thickness of each plate shall be at least 6mm.
7.3 Stay Washers- These shall be made of mild steel plate and be galvanised. The plate thickness shall be at least 6mm and each side shall be 150mm. The weight of each washer shall not exceed 1.0kg.
7.4 Stay Rods- These stay rods shall be manufactured to BS 16 Pattern 2. They shall be made of mild steel of Malleable cast iron to BS 309. They shall be hot dip galvanised.
7.5 Stay Thimble- The thimbles shall be made according to B.S 464 and shall be Hot-Dipped galvanized.
7.6 Stay bracket- The stay bracket shall be hot dip galvanized and be made of mild steel flat bar. Cold bending during manufacture is not permissible. |