LBT PROJECT
2X8,4m TELESCOPE
| Doc No. | :401a026 |
| Issue | :B |
| Date | :August23, 1999 |
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LBT PROJECT
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LBT PROJECT
TECHNICAL SPECIFICATION
CRABS
For
Bell Jar and M1 Dummy Cell
INDEX :
2 . TECHNICAL DATA AND DRAWINGS.
5 .LIST OF ATTACHED DRAWINGS AND DOCUMENTS-
The present document covers the supply of the two crabs for the Bell Jar and M1 Dummy Cell.
The two crabs have different technical characteristics and dimensions. The maximum overall dimensions indicated on the enclosed assembly drawing 822a000 are mandatory. For this reason in the following section and in the enclosed drawings are detailed the type and size of the electromechanical components evaluated according to the specified FEM (CMAA) class, along with the maximum allowable structural dimensions.
The Manufacturer is requested to verify all the suggested design, taking with the offer the whole responsibility of the design and the construction of the crabs.
As can be understood from the specified working speeds and regulation range, the crabs are mostly used to mate the M1 Dummy Cell and the Belljar and must have a very smooth control of the movement.
The interfaces between the crabs and the M1 Dummy Cell and the Belljar must allow fine adjustment through shims to compensate structure deformation under loading.
The supply includes the rail to be installed by the erector at the Columbus OHIO.
The control of the Belljar crab shall be done by a plug-in handheld located on board of the crab. The handheld shall be a standard control box with pushbuttons to control all crab motions with a 5 meter cable.
The whole electrical plant on board of Belljar crab is part of the present supply. The plant shall be interfaced by a junction box made of a power plug and a emergency stop pushbutton
Taking into account that the transport between the Columbus OHIO and the mountain requires pieces shorter than 12 m, it is mandatory the construction of the structure in various sections each, bolted together with HT bolts.
In the following chapter are listed the dimensional and load constraints along with the minimum design stiffness requirements (see Technical Report 822a005). The Manufacturer shall analyze the related wheels friction torque, both at the start and during the constant speed motion.
- Spare parts - In the tender price shall be included one set of electric usable components for the placing in operation of the crab and a list of the mechanical and electrical spare parts recommended by the Manufacturer for 25 years operation.
- Erection and start up of the crabs - The Manufacturer must assure - under request of the LBT.P.O. and subject to separate reimbursement - the assistance on Site (the OHIO STATE UNIVERSITY) through a Supervisor for the erection and setting into operation of the crabs.
Working conditions-
The crabs are required to grant the specified performances in the following environment conditions :
| - Operating temperature | -10 ÷ +30 °C |
| - Operating pressure | 500 ÷ 600 Torr |
| - Operating humidity | 5 ÷ 95 % |
| - Storage temperature | -30 ÷ +50 °C |
| - Storage pressure | 500 ÷ 700 Torr |
| - Storage humidity | 5 ÷ 80 % |
| - Altitude | 3250 m a.s.l. |
2 - TECHNICAL DATA AND DRAWINGS -
2.1 – Crab for Belljar - TECHNICAL SPECIFICATION
-| - N. 4 wheels | 400 mm contact diameter | ||||
| - | Revolving shaft type supported by roller bearings - Direct drive - | ||||
| Flat rail 65 mm useful width - 5 rpm nominal speed- | |||||
| - N.2 driven wheels, through gear/motor unit, 0.25 kW - 4 Poles motor, self braking with disk brake | |||||
| Estimated crab weight without Belljar | 77 KN |
| Estimated Belljar load | 216 KN (min) |
| 255 KN (max) |
N.B. : the travel movement is regulated by Variable Frequency Drives (Inverter) to achieve the specified speed between 0.1 and 1 m/min
2.2 – Crab M1 Dummy Cell - TECHNICAL SPECIFICATION
| - N. 4 wheels | 400 mm contact diameter – |
| - | Revolving shaft type supported by roller bearings – |
| Flat rail 65 mm useful width - 5 rpm nominal speed- | |
| - N.2 wheels | braking with manual brake |
| Estimated crab weight without Dummy Cell | 70 KN |
| Estimated M1 Dummy cell load | 350 KN (min) |
3.1 - DRAWINGS -
This is the first activity to be performed by the Manufacturer.
Within 1 month from the order confirmation, the Manufacturer shall supply to the LBTP.O. (Project Office) the workshop drawings and the Part List defining all the interfaces and relevant demanded tolerances for approval, before starting the construction.
The Drawings shall be supplied in AUTOCAD format, on floppy disk and shall be performed according what specified in the "Statement of Work", attachment A of the RFP.
3.2 - PLANNING -
With the above mentioned drawings the Manufacturer shall submit to the P.O. a detailed planning of construction, evidencing the intermediate tests and verifications foreseen by its Quality Control Service.
3.3 – PROCEDURE
Preparation of all procedures and methods to execute the critical operations of the manufacturing.
3.4 - Surface protection and painting
After the heat treatment and sand blasting SA 2.5, all the crab structure must be protected with Primer (160
m thickness) before machining.3.5 -DELIVERY -
After the tests, at workshop, the crabs shall be shipped to the laboratory (Columbus OHIO UNIVERSITY).
The LBTPO will arrange for shipment from the Columbus OHIO to the erection site on the mountain.
The Manufacturer is requested to quote, as a separate item in his offer, the cost of the shipment to Columbus OHIO
4 - TESTING -
According to the Manufacturer Quality Control Planning - delivered to P.O. according to Item 3.2 -, at the delivery of the crabs shall be included all the materials and tests certificates produced during the manufacturing.
The LBTP.O. has the right to witness to all the tests that shall judge interesting, and shall inform the Manufacturer of his program at the approval of the workshop drawings and the planning for construction.
4.1. Testing.
Manufacturers are requested to construct the crabs in a manner consistent with USA OSHA Safety Standards 1910.178, as per CMAA # 70.
5 - LIST OF ATTACHED DRAWINGS AND DOCUMENTS
CAN NO :
822a000 – Support structure for Belljar and Dummy Cell –General Assembly
822a005 – Technical report
822a007 – Rail for Belljar and M1 Dummy cell Crabs
821x001 – Aluminizing Bell Jar Assembly
721a020 – M1 Dummy Cell Structure Assembly
Doc_info_start
Title: Technical Specification
Document Type: Technical Specification
Source: ADS International Srl
Issued by: Anaclerio
Date_of_Issue:08/23/99
Revised by:
Date_of_Revision:
Checked by:Gallieni
Date_of_Check:08-24-99
Accepted by:J.Hill
Date_of_Acceptance:08-25-99
Released by:
Date_of_Release:
File Type: MS-WORD 7
Local Name:
Category: Telescope Azimuth Platform
Sub-Category: General Telescope
Assembly: Technical Documentation
Sub-Assembly: Technical Specification Maintenance Cranes for Enclosure and Annex Buildings
Part Name:
CAN designation:401a026
Revision: B
Doc_info_end