PROVISION OF MOTORISED SYSTEM FOR MCF HANGER (T-72A) AT INS SHIKRA

Supply and fixing of Automation system, including motors with complete control panels, master drive wheels of material EN - 09, replacement of existing top rollers and bottom supporting wheels (driven wheels) and all necessary automation accessories for the existing hanger door consist of 6 leaves of clear width of 24000mm x clear height 6000mm including taking down carefully old hanger leaves if required and refix the same existing leaves after necessary automation work complete all as specified and directed by Eng in charge.

Design , supply , fabrication and comissioning of automation system for existing 6-leaves sliding hangar door with any framework, modifications, necessary structural work required for automation shall be done at site with designed to ensure structural integrity. hangar door automation to be erected at the site, retro fixed to the existing hangar door structure, and tested to ensure proper functioning and alignment. work shall include the supply and installation of all necessary hardware, including control panel and all necessary automation accessories shall be fixed on the designed hangar door drive leaves. Hanger door automation shall be designed to operate smoothly and efficiently, with a minimum of maintenance required. automation system shall be supplied in accordance with the relevant Indian Standards and International Codes, and shall be subject to inspection and testing all as specified and directed by Engineer-in- Charge.

Suitable motor power operation, each drive door leaf shall be fitted with its own drive unit. 3-Phase Electric Motor of suitable rating shall drive each drive leaf depending on site requirement with IEC classification IP55 or above & minimum thermal protection of 155(F). The drive transmission between the motor and the drive wheel shall be through a chain-sprocket assembly. Drive units should comprise a squirrel cage motor with integral magnetic brake and a high efficiency helical-bevel or helical-worm reducing gearbox, driving the bottom wheels through a roller chain. motor drive system must be of european make

Each drive unit shall be fully enclosed in a removable casing (Trap Door) which is easily accessible from the outside of the hangar via hinged or removable access covers. Drive unit access covers shall be interlocked so that the leaf cannot be driven under power unless all are closed.Power is to be transmitted to each drive door leaf by means of an enclosed duct type overhead conductor system(Bus bar system). Each drive leaf shall draw a pick-up trolley through the conductor system(Bus bar system). The conductor system(Bus bar system) shall be rated to IEC classification IP44 as defined in EN 60529:1992 and shall be capable of operating satisfactorily in maximum anticipated temperatures underneath the canopies In the event of manual operation is required, a simple system which allows towing operation by powered vehicle e.g. fork truck / with a team of two to four members depending on size of the door & weight.

Design/drawing clearence for any in house or on site fabrications work for the placment of automation system on the hangar door, to be submitted before starting of the work for approvl. Operation and maintenance training to be given by the executing agency and shall provide 3 copies of “Operation and Maintenance Manual”, written in English language

Any MS structural fabrication(Factory supplied) will be applied with a 4-stage C5M coating process. Zinc rich Epoxy primer coat 45-55 microns Epoxy MIO intermediate 100-150 microns Epoxy HB coating 100-120 microns Polyurethane Finish HB 50-75 microns total coating thickness of approx. 300 microns has to be applied after in house sand blasting treatment. paint has to be an atmospheric corrosivity category of C5M in accordance to ISO 12944. The testing and inspection of the paint is in accordance to EN ISO 12944-7. The durability of C5M against corrosion has to be more than 15 years.

weather sealing system for the sliding doors must be designed in conjunction with the cladding system to minimize sand ingress in particular, all vertical joints between leaves on adjacent tracks and the two end jambs are fitted with twin tapered EPDM wiper seals set in aluminum extrusions.

The hangar door control systems are to be designed to comply with EN 12453: 2001 – ''Safety in use of power operated doors – Requirements”. The main electrical control equipment for drive leaf shall be housed in a standard steel electrical cabinet to IEC classification IP55 as defined in EN 60529:1992. The cabinet shall be mounted inside the bottom section of the drive leaf. All other principal electrical controls including limit switches and door sensors shall be fitted at low level for ease of maintenance. Each drive leaf is to be fitted at each end with a pendant push button. Push buttons and pendants shall be to IEC classification IP65 as defined in EN 60529:1992. The pendant is mounted to the end of the drive leaf on a cord approx. 2 metres long that allows the operator to move 180 degree from side to side to see where the door is being driven. The pendants are to be hung up on hooks when not in use. Buttons provided should include (as a minimum): “MOVE” button; “EMERGENCY STOP” button; “DOOR CLOSED” indicator light, to indicate when a drive leaf has reached its fully closed position. The push button system shall ensure that drive leaf can only be operated from their leading edge i.e. not allow any drive leaf to be reversed

Each drive leaf is to be fitted with an audible and a visual alarm. The alarms are to operate for a short period before a drive leaf starts to move. Interlock switches are to be fitted to any access covers for drive units and electrical control panel doors, to prevent their drive leaf being used while these are open. The detailed specifications of hangar door automation including that for electronic/mechanichal drive system for each door panel shall be as per hangar door manufacturer and approved by accepting officer prior to fabrications. supply of complete automation system from Hangar Door Manufacturers must submit at least one direct order copy or work completion certificate from the Military Engineering Services (MES) in the financial year 2024-25. Hangar Door Manufacturers must furnish documented proof of performing and installing a minimum of 8 No's of motorized automated sliding hangar doors in the financial year 2024-2025.Manufactured products will be inspected at the factory before dispatch to the site.

All cable laying works and cable tray installations shall be executed in accordance with the latest industry standards and in compliance with the approved engineering design documentation. The installation shall involve the secure mounting of cable trays, ensuring proper segregation and routing of power, data, and control conduits without compromising accessibility or maintenance requirements as specified and directed by Engineer-in- Charge. Provision will be provided by Engineer-in- Charge for an isolator switch, conforming to the appropriate electrical ratings and safety standards, installed at a location on any side of the hangar as per the hangar door manufacturers designated specifications. A manual release mechanism, as designed and provided by Hangar door manufacturer, shall be integrated into the system to allow for safe deactivation of the automated functions during maintenance or emergency conditions.manual release arrangement must be tested and certified to meet all safety and operational reliability standards prior to final handover. The opening and closing speed of the hanger doors should be 8 to 10 metre per minute.

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