| The communication shelter container shall be designed and manufactured for a design life of 15 years minimum under the following environmental conditions. |
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• Outside temperature range of –5 degrees C to +60 degrees C.
• Humidity – 95 %.
• Direct solar radiation.
• Withstand a 3 sec. gust wind speed of 45 m/sec.
• IP rating (Dust and water penetration): IP55.
• Heat permeability coefficient (thermal rating) less than or equal to 0.4 W/m2 K
• Inside temperature range 18 – 22 degrees C. |
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| 2) Loading Conditions. |
750 Kg/m2 as distributed load
1500 Kg/m2 at areas of battery string
Floor – 400 kg as concentrated load
Floor – 30 kg/cm2 as punching load
Wall – 55 m/s. as wind load
Roof – 150 kg/m2 as distributed load |
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| 3) Container Frame (supporting the container). |
| The container frame shall be bolted with trailer frame using suitable Connection plates. All metal hardware shall be made of HDG steel or protected otherwise from corrosion. |
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| 4) Floor. |
The floor shall be manufactured from insulated panels that have a core of polyurethane, mineral wool, or other insulation material, covered by two sheets of sheet metal. The panels should then be covered with fire resistant plywood sheet. The panels and plywood thickness shall be sufficient to withstand the floor loads without bending or warping.
The plywood shall be covered with an antistatic PVC sheet, glued securely to the plywood. At the intersection between the floor and wall, the floor has to be provided with earthing grid. |
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| 5) Walls and Roof. |
| The walls and roof shall be manufactured from insulated panels that have a core of polyurethane, mineral wool, or other insulation material, covered by two sheets of sheet metal. |
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| Wall thickness shall be 100 mm and minimum thickness of galvanized sheet will be 0.6 mm Wall shall be strong enough to support air conditioners, power distribution panels, cable entries, cable ladders, and doors. Wooden rings should surround the walls in the fixation levels. |
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| The container exterior shall be painted with an exterior weather resistant finish (white). Shelter wall will be 10 cm sandwich panel (2 metal sheets each is 0.6mm thickness + polyurethane wall.) |
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The metal part of the sandwich panel has to be treated against corrosion. Shelter roof material has to be like walls (sandwich panel); roof should be able to support a load of 150 Kg/m2.
The connections between shelter walls have to be interlocked more over, an aluminium angle connecting them. |
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| 6) Door. |
The door should be placed in the long side.
The door shall have a clear width of 900mm.
The door shall open outwards and should have an external knob and an internal handle. A panic device shall be included on the inside of the door; so that the door can be opened from inside even if the door is locked. |
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| The door shall be weatherproofed using silicon rubber to keep out water, wind and dust. The door shall be made of the same materials as the walls. |
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| Bottom of the door will be 5-8 Cm above the floor level. The door clear height = 2.00m. The door has to be provided with a label -clearly visible plate- {DANGER - HIGH VOLTAGE) in English and National Language. Door is provided with master key pad lock. |
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| 7) Wall Openings. |
| The design includes holes to be cut in the sandwich panels to provide for Feeders, Ventilation, Cooling, Power and Earthing Cables. |
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| On the left side of the rear wall of the container, cable entries shall be installed near the top of the walls for coaxial cable. There is Cable Entries also on the rear wall of the container for the Main Power Cable, Obstruction Light Cable, Feeding Winches Cable, Air conditions and Earthing. The cable entry systems used shall be a Roxtec, BST or equivalent. The system can withstand hazards as: |
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• Dust.
• Fire (up to 60 minutes fire resistance).
• Explosion.
• Gas pressure.
• Noise.
• Vibrations.
• Temperature variation.
• Water.
• Vandalism.
• Insects.
• Humidity. |
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| 8) Cable Ladder. |
| Indoor cable Ladders may be galvanized type, approximately 400mm wide. They shall be suitably supported using hardware connected to the walls or ceiling. The cable Ladders should be installed near the ceiling along each of the long walls and along the back wall. as well as one in middle of the shelter. |
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| 9) Power Distribution Panel |
| The power distribution panel shall be made of sheet metal with a close able door, with main circuit breaker and group of smaller ones have all the smaller ones. |
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| 10) Air Conditioning System. |
The Air Conditioners will be two Package units (1+1) each with cooling capacity =3 ton Ref. With cooling capability both of them will be connected to the AC control panel.
HVAC control panel shall incorporate: |
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• Automatic interchange between two units for set time of min 12hrs.
• Facility for 2nd unit to automatically start in case the shelter internal temp rises above set temp of 25°C.
• The standby unit must automatically start incase the duty unit fails.
• The duty unit must automatically start when power returns after a power failure. |
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| The controller should generate the following alarms: |
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• High temp
• Any AC failure
• Stand by AC on |
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| 11) Fire Alarm System. |
| The Fire fighting system is a fixed installation where equipment is designed and installed to provide Fire Monitoring and Automatic Fighting. The main system components are as follows: |
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• Automatic Detection.
• Automatic Alarms and Ventilation disconnection. |
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| Automatic Detection. |
The Fire Detection System consists of 2 combination loops which are as follows:
One loop equipped with optical smoke detectors as an option The smoke detector is capable of detecting products of combustion even before the presence of visible smoke.
One loop equipped with ionized smoke detectors. The smoke detector is capable of detecting products of combustion even before the presence of visible smoke |
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| Automatic Alarms and Ventilation disconnection. |
The Fire Alarm Control Panel is capable of producing the following:
Free voltage contact to the Site Alarm Frame. Its status is changed in case of Fire Detection by either Detectors. It has the facility to be either Normally closed or Normally Open.
Free voltage contact to the Site Alarm Frame. Its status is changed in case of Gas Cylinder Evacuation. It has the facility to be either Normally closed or Normally Open.
Free voltage contact to the Air Condition Control System. Its status is changed in case of Fire Detection by either Detectors. It has the facility to be either normally closed or Normally open. |
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| Container Indoor Lightning Protection/Grounding. |
| The container indoor lightning protection system will meet the following requirements: |
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a. 2 Copper Earth bars are installed inside the shelter one below the Electrical Distribution panel and one below the Feeders entry.
b. All the metallic parts( Rectifier, Batteries, BTS, Cable Ladder, MW rack, Door and gas cylinder, etc.) inside the shelter is connected to either bars by a proper Grounding cable cross section.
c. The 2 Copper Earth bars are connected by a 70 mm2 Grounding cable . |
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| Fire Rating, Type Approval, and Certificates. |
| Container doors shall normally be rated for a minimum of 30 minutes of fire protection. The walls and roof shall normally be rated for a minimum of 30 minutes of fire protection. |
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| Standard Accessories. |
| The following accessories shall be included in the container supply. These are additional to the items shown above. |
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• Interior lights – 2 each 40 watt ceiling mounted fluorescent lights
• Interior emergency lights
• External Light with Photocell.
• Electrical wall outlets – 2 each double wall outlets 220 volts. |
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