2x8.4m TELESCOPE
TECHNICAL SPECIFICATION
TELESCOPE PRE-ERECTION
Date: September 1st, 1997
Approved and prepared by: Gianpietro Marchiori/EIE
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LBT PROJECT 2x8.4m TELESCOPE |
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TECHNICAL SPECIFICATION TELESCOPE PRE-ERECTION | ||
Date: September 1st, 1997 Approved and prepared by: Gianpietro Marchiori/EIE | ||
INDEX
1.0 SCOPE OF WORK
2.0 APPLICABLE DOCUMENTS
3.0 ITEM DESCRIPTION
3.1 Azimuth Ring and Mechanical Jacks
3.2 Azimuth Frame Structure
3.3 Central Bearing
3.4 Rolling Sectors and Supporting Arms
3.5 Elevation Platform and Windbracing Structure
3.6 M1 Cells
3.7 Derotator Structure Supports
3.8 Spiders and relative Dummies
3.9 Hydrostatic Bearing System
3.10 Drive Systems
3.11 Encoder Systems
3.12 Auxiliary Equipment
3.13 Azimuth Floor
3.14 Limit Switches for Axes Rotation
3.15 Dynamic Balancing System
3.16 Static Balancing System
3.17 Access Equipment
3.18 Plants Installation
3.19 Auxiliary Activities
4.0 INTERFACE DEFINITIONS
4.1 Telescope Concrete Pier
4.2 Electrical Installations
4.3 Cooling System
5.0 AUXILIARY SUPPLIES
5.1 Dynamic Balancing System
5.2 Static Balancing System
5.3 Access Equipment
5.4 Azimuth and Elevation Mounting Devices/Jacking System
5.5 Azimuth Floor
5.6 Limit Switches for Axes Rotations
6.0 RELIABILITY, MAINTAINABILITY REQUIREMENTS
7.0 ENVIRONMENTAL CONDITIONS
8.0 DESIGN AND CONSTRUCTION REQUIREMENTS
8.1 Surface Treatments
9.0 PRE-ERECTION
10.0 PACKING AND TRANSPORT
11.0 ACCEPTANCE TESTS
12.0 SPARE PARTS
ANNEX
The present document describes the pre-erection activities of the LBT telescope.
The aim of the LBT (Large Binocular Telescope) Project is to realize a telescope having two mirrors of 8.4 m diameter, to be installed at Mount Graham in Arizona (ref. dwg. No. 407e001).
The pre-erection activities shall be developed by the contractor workshops, or other eventually agreable location, to ensure proper form, fit and operation of each and every component part of the telescope. They include also the pre-fabrication of components of the telescope structures.
The Contractor shall provide for, within the pre-erection activities:
| Title | Document |
| See attached list |
| See attached list |
The pre-erection activities refer to the following telescope's components, supplied by the LBT Corporation:
and to the following telescope's components to be manufactured and/or supplied:
The telescope shall be installed in an adequate environment closed and free from dust, vibrations and/or other activities that could influence the assembling, testing or functioning phases.
The dimensions of this area shall guarantee the rotation of the telescope on two axes (height: 22 m over the track and under the hook; diameter: 24500 mm) and shall be equipped with opportune equipment able to assist during the assembling and testing activities and in particular lift pieces of at least 60 tons.
The telescope shall be installed on a temporary pier having stiffness characteristics according to the information contained in chapter 4.0.
The interface with the foundations (see also # 4.1) is characterized by the use of MECHANICAL JACKS (doc. No. 401e027), fixed into the concrete by means of auxiliary anchoring bolts (they will be left cast into the concrete) for the AZIMUTH RING (doc. No. 401e018) fixing and adjustment.
The AZIMUTH FRAME STRUCTURE (doc. No.401e018) shall be installed taking care of the fabrication and installation of the AZIMUTH MOUNTING DEVICES and relative JACKING SYSTEM (see also # 5.4) as illustrated on dwg. No. 421e046.
In the centre of the AZIMUTH RING an auxiliary basement shall be predisposed for the adjustment and fixing of CENTRAL BEARING (doc. No. 401e026) as illustrated on dwg. No. 421e046 (hypothesis for pre-erection) that simulate the installation on site represented on dwg. No. 421e037.
The ROLLING SECTORS AND SUPPORTING ARMS (doc. No. 401e029) compose the principal structure of the elevation axis and shall be installed above the elevation radial pads, held by the axial pads.
The ELEVATION MOUNTING DEVICES shall be manufactured and mounted for the installation (see also # 5.4).
The ELEVATION STRUCTURE and WINDBRACING STRUCTURE (doc. No. 401e029) represent the connection between the rolling sectors and the structures for the support and access of the M1 CELLS and pertinent instruments.
The pre-erection foresees the installation of one M1 CELL completed with a M1 DUMMY and a second M1 DUMMY CELL completed with a M1 DUMMY [doc. No. 401e038 (t.b.d.) and 401a015)].
The assembly activities of these structures shall emulate the operations of assembling/disassembling on site.
Therefore all equipment able to move the structures, both with the elevation structure in horizontal position and in vertical position, shall be provided for.
The relevant DEROTATOR CABLE WRAPS shall be installed on the lower part of the M1 CELLS (doc. 401a012).
On the elevation structure, between the two M1 cells, the DEROTATOR STRUCTURE SUPPORTS shall be installed (doc. No. 401e031), completed with the pertinent DEROTATOR CABLE WRAPS (doc. No. 401a012).
The following SPIDERS and the relevant DUMMIES, shall be provided for, in order to verify the geometries and the functionality:
On the contrary, only the F4 and M3 DUMMIES shall be installed (doc. No. 401a005).
All assembled SPIDERS shall be provisionally equipped with electrical installations of power and control.
The HYDROSTATIC BEARING SYSTEM (doc. No. 401a006) shall be completely installed by using the material supplied by the LBT Corporation. A provisional OIL RECOVERY SYSTEM shall be predisposed both for the AZIMUTH and the ELEVATION PADS. All plants at the service of this system shall be defined (see also # 3.18, 4.2, 4.3).
The ELEVATION and AZIMUTH DRIVE SYSTEMS (doc. No. 401a002) shall be mechanically assembled and shall be adjusted in order to check the correct functioning.
All electrical installations shall be supplied and performed by the LBT Corporation.
The Contractor shall provide for the assistance during assembling of the installations and auxiliary equipment.
The ENCODER SYSTEMS (doc. No. 401a006) shall be installed on the AZIMUTH RING and AZIMUTH FRAME and on the C-RINGS and AZIMUTH FRAME, respectively for the Azimuth and the Elevation axis.
The Contractor shall supply exclusively the mechanical and geometrical verifications.
The installation of the following sub-systems is part of the pre-erection activities:
The contractor shall predispose the mechanical assembly and the provisional installation of all systems at the service of the above mentioned auxiliary equipment (see also # 4.2), except the electrical and hydraulic plants of the ELEVATION MANUAL DRIVE that are defined.
The Contractor shall provide for and install the AZIMUTH FLOOR, according to the indications given on # 5.5.
The Contractor shall provide for and install the LIMIT SWITCHES FOR AXES ROTATION, according to the prescriptions indicated on # 5.6.
All relevant installations shall be provisional.
The Contractor shall supply and install a DYNAMIC BALANCING SYSTEM, according to the requirements listed on # 5.1, in order to balance the different combinations of the secondary optics (mobile spiders). In this case all relevant installations shall be definitive.
The Contractor shall supply and install a STATIC BALANCING SYSTEM, according to the requirements listed on # 5.2, composed by masses placed in conformity with the drawings and the indications which will provided for by the P.O..
The Contractor shall supply and install the ACCESS EQUIPMENT (made up of staircases, gangways and/or access to carry out the maintenance and/or inspection), for the different floors of the telescope and the various equipment assembled on it, according to the indications listed on # 5.3.
The Contractor shall provide for and install a series of plants installation, as described above and better clarify on # 4.2. These plants installation shall allow the functional verification of the different components of the telescope.
The principal installation to be predisposed and/or installed are:
All installations shall be temporary, except for the plants at the service of the HYDRAULIC PADS SYSTEM (supplied by the LBT Corporation).
The Contractor shall perform, in addition to the prescriptions listed above, the following activities:
Interfaces are defined by:
As already specified in the previous chapter, those components are part of the supply.
The telescope is assembled on-site on a foundation system defined in dwgs. No. 421e024 and 421e037. The contractor shall predispose by his workshop, or other mutually agreable location, a foundation system with the same geometrical and functional characteristics.
The typical dimensioning data of the foundation system are represented in dwg. No. 421e046. The contractor shall predispose adequate analyses on the status of the ground chosen for the pre-erection activities of the telescope, perform the pertinent calculations of dimensioning and the verification of the performances requested in the above mentioned drawings and characterized by:
The contractor, which is the sole responsible, shall submit the relative proposal to the P.O.
All electrical components of the telescope shall be designed and supplied to operate on electrical power that is 480V - 60Hz three-phase and 120V - 60Hz mono-phase, with neutral.
The contractor shall supply the electrical power indispensable to the temporary feeding of all electrical users, necessary for the functioning and test operations foreseen in chapter 11.
The electrical systems to be fed are the following:
The power system described is shown in the general assembly of dwg. No. t.b.d..
The contractor shall predispose a temporary control system for the management of the above mentioned systems, except for the control system of the HYDROSTATIC BEARING SYSTEM and DRIVE SYSTEM which shall be supplied by the LBT Corporation.
The contractor shall provide for all telescope's distribution systems (cables, cable tray, etc.) necessary to activate the above listed users.
The ducts placing and pertinent distribution lay-out inside the telescope shall be defined and approved by the P.O..
The Contractor shall also predispose all fixings to the structure for the electrical cabinets and other plants equipment.
Since the azimuth cable wrap systems will not be installed, particular attention should be paid when laying the cables at the service of the movable users located on the mobile structures of the telescope (azimuth and elevation).
The contractor shall foresee sufficient stores of cables and adequate protection, in order to allow the rotation of the axes, as indicated in chapter 5.0.
All above mentioned plants shall be provisionally installed and will not be re-used for the final assembly on site; however, they shall be in accordance with the safety and electrical requirements. For that purpose, the contractor shall prepare specific documents to prove their compliance.
The telescope is equipped by a cooling system for some important heat generation points, in particular the HYDROSTATIC BEARING SYSTEM.
The contractor shall predispose a chiller for the production of glycol water nearby the area of pre-assembly of the telescope, completed with tanks, pumps and pertinent adjustment and control accessories, dimensioned for a min. cooling capacity of 60000 F/h (see Technical Specification No. 401a003).
The system shall be in connection with the exchangers placed on the hydrostatic power station of the bearing system.
All above mentioned plants shall be provisionally installed and will not be re-used for the final assembly on site. The proposed system shall be approved by the P.O..
The contractor shall detail design, manufacture and install the following subsystems:
The Contractor shall supply all engineering and management activities, services, labor, materials, components, supplies, tools, equipment, in order to make the above listed subsystems complete and operating, and perfectly integrated in the structures.
The activities shall be developed according to the requirements reported on # 1.0.
Before starting the fabrication, the Contractor shall submit solutions and/or fabrication details to the P.O. approval.
The telescope has the possibility to change the combinations of secondary mirrors and auxiliary equipment by rotating the swing-arm spiders. The spiders and relative instruments/accessories can be installed and changed later.
These functions shall be guaranteed by a dynamic balancing system composed of stainless steel water tanks (see dwg. No. 406e004, 006 and 008) placed on the elevation axis structures (see dwg. No. 406e002, 003, 005 and 007) and connected to each other by pumps, level gauges, electric valves, etc. (see dwg. No. 406e001).
The system is made up of two plants, separated from an hydraulic point of view: VERTICAL AND HORIZONTAL BALANCING.
Bi-directional pumps, actioned by electric drives and motorized valves placed at the ends of each tank, shall be used to fill the various tanks.
The plant shall be of closed circuit type with opportune expansion tanks.
The whole system shall be adequately supported, to avoid the transmission of vibrations to the telescope structures and shall be manually driven by an electrical cabinet (to be supplied). The electrical cabinet shall be interfaced to the automatic/programmable system (supplied by the P.O.) for the control/management of the balancing, depending on the spiders and instruments combination installed and/or in operation.
The Contractor shall also provide all auxiliary equipment able to guarantee the correct functioning of the system.
Diaphragms shall be put in the tanks to avoid sloshing.
The final capacities of tanks and pumps will be communicated by the P.O. before fabricating and/or purchasing the components.
The system shall be completely insulated by ARMAFLEX insulating material or equivalent approved by the P.O.
The contractor shall detail design, manufacture and install a telescope's static ballast. The equilibration masses shall be made up of lead or other approved material and installed on the steel structures of the telescope, according to dwg. No. 406e009 and the specific indications to be given by the P.O. (total reference weight 4 tons).
The contractor shall detail design, manufacture and install all accesses to the different components and/or systems of the telescope and for each level, according to the scheme given in dwgs. No. 407e000, 001, 002, 003 and 512e066.
This means that all accesses shall be implemented (staircases, gangways, etc.) to allow the inspection and/or maintenance of the various components of the telescope by one person with light tools.
Moreover, some walkways at the elevation structure level (dwg. No. 512e066) shall be made up of grating, in compliance with the loads indicated on the drawing.
Particular attention should be paid for the edging of structures and/or equipment (in particular for the cell - dwg. No. 720a007).
The contractor shall install possible additional frames to guarantee the above mentioned loads.
The same kind of grating shall be implemented at +29820 mm inside the windbracing structures for housing and access to the different electrical boards.
All activities pertinent to the pre-erection have been conceived to simulate and test the erection on-site procedures of the telescope structures and equipment.
Consequently, the Contractor shall predispose all assembling and testing equipment, based upon the philosophy described in detail in # 9.0.
So, he shall perform and use the equipment supposed in dwgs. No. 400e033, 400e036 and 500e056 (or propose equivalent alternatives).
In dwgs. No. 400e030, 031 and 032 are indicated the geometries for the positioning of the above mentioned elements.
The components' movement (AZIMUTH FRAME, ELEVATION STRUCTURE, etc.) shall be carried out through a JACKING SYSTEM illustrated on dwgs. No. 400e034 and 500e056 and shall be used according to the sequences reported on dwg. No. 400e035.
The JACKING SYSTEM shall be operated by and hydraulic portable gearcase, able to assure very slow and synchronized lifting.
The HYDRAULIC JACKS shall guarantee the lifting of the whole telescope structure and equipment (total weight ~ 550 t).
The Contractor shall detail design, manufacture and install an AZIMUTH FLOOR able to assure the continuity between telescope and enclosure floor, the azimuth ring covering, the access from/to the telescope, as well as thermally insulate the telescope structures.
These platforms, schematized on dwgs. No. 400e024, 025 and 038 are composed of a main structure with steel profiles connected to one another through bolted flanges. The upper covering is made up of aluminium rolled plates (thickness 3(4 mm, No. 4+2), screwed to the steel structures below.
Further reinforcements shall be foreseen to guarantee the loads reported on dwg. No. 400e024.
The supply includes also the contrast element of the azimuth BUMPERS, fixed by means of bolts to the AZIMUTH FRAME (dwg. No. 400e025), all made up of steel welded plates.
The terminal side of the AZIMUTH FLOOR has the function of sealing/closing against air with respect to the building's floor.
Sealing shall be carried out by using a light structure with steel profiles that will support a rubber vertical plate (seal), as indicated on dwg. No. 400e038, and will be inserted inside a small tank filled with liquid.
The Contractor shall supply all elements of the part integral with the AZIMUTH FLOOR.
The detailed drawings shall be prepared and delivered before any purchasing and/or manufacturing activity.
The Contractor shall detail design, manufacture and install a LIMIT SWITCHES SYSTEM to limit the rotation of the telescope axes.
The supply shall include a double series of limit switches, having the following main functions:
Azimuth Axis (provisional system):
Elevation axis:
The Contractor shall supply all relevant support and drive systems, that shall be prior approved by the P.O. before their fabrication and installation.
6.0 RELIABILITY, MAINTAINABILITY REQUIREMENTS
The useful lifetime of the telescope is expected to exceed 25 years.
The contractor shall take into account of all aspects which could limit the lifetime of the supply.
He shall also contain the number of maintenance interventions, supply adequate access for maintenance operations and minimize risks of damage, loss and injury to personnel and the telescope from telescope maintenance operations.
This chapter defines the natural and induced environmental conditions the telescope and subassemblies will encounter during its lifetime.
8.0 DESIGN AND CONSTRUCTION REQUIREMENTS
Scope of the present chapter is to introduce the main characteristics of the supply from a manufacturing point of view.
The Contractor shall take care of confirming the adopted criteria or propose alternative solutions, in order to obtain the requested performance.
The Contractor shall supply and fabricate all parts, equipment, components and materials indicated in chapters 3, 4 and 5.
Moreover, all auxiliary element such as lifting, machining, assembly and tests equipment, shall be fabricated and provided for to complete the functionality of the supply as defined in # 3.0.
Surface to be welded shall be dry, clean and free from loose scale, grease, or unsuitable protective paints or coatings. All welded parts and assemblies, unless specified or approved otherwise by P.O., shall be fully stress relieved prior to final machining operations. Stress relieving shall be accomplished by the heat treatment method in a chamber with sufficient volume and temperature capacity to fully stress-relieve the welded parts and subassemblies.
All purchased and/or fabricated components, not included in the LBT Corporation supply, listed in chapters 3, 4 and 5 shall be adequately tabulated in terms of weight and submitted to the P.O. approval.
The materials are indicated in the drawings and relative part lists or in this document.
For the steel structure profile and plates use Fe510C UNI EN 10025.
All welding operation shall conform to the standards set forth in American Welding Society specification AWS D1.1 or equivalent approved by the P.O..
Welding operation shall be performed in such a way as to guarantee the tolerances indicated on drawings. For this purposes, welding procedures shall consider possible shrinkages or expansions during welding operation and minimize the distortion and lock-up stresses.
The contractor shall perform and provide trial welds to demonstrate the soundness of any proposed welding method, and the competence of any person performing welding work, as required by P.O. at any time.
All weldings, which are important from a structural point of view, shall be opportunely checked (NDT X-ray or Ultrasonic or Magnaflux; acceptance criteria UNI 7278).
The general tolerances of the welded parts shall be in compliance with CNR-UNI 10011 and UNI 11001 standards.
Tolerances for linear and angular dimensions are specified on relevant drawings. These tolerances are mandatory, for structure acceptance. Where not specified, ISO 2768 part 1/m and 2/k shall be applied.
All bolts shall be at least Class 8.8 metric bolt CNR-UNI 10011 paragraph 11.1.3.
The Contractor will present, in a detailed way, the following documents:
Note: the overmetal indicated on the fabrication of the steel works requires an accurate fabrication (carpentry dimensional tolerances 5÷8 mm). It is up to the contractor to maintain them or to modify them, in order to ensure the successive mechanical machining and relative tolerances. Any modification must be approved by the P.O..
All metallic surfaces, other than rating machining surfaces shall be painted, coated or otherwise permanently protected against atmospheric corrosion.
At a minimum all paints and coatings shall provide for the following functional requirements:
The contractors shall utilize the following paint system in performance of the work.
The supplier can propose an alternative painting cycle; in any case this shall be able to guarantee the above mentioned requirements.
The surfaces which are machined and not painted shall be protected with protection material of "peeling" type.
The Contractor shall assemble all telescope components, completed with the relative auxiliary equipment, as foreseen in # 3 and 5.
All activities shall be conceived to simulate and test the erection on-site procedures of the telescope structures and equipment.
Consequently, the Contractor shall predispose all assembling and testing equipment, based upon this philosophy.
All materials necessary for the assembling of the various components are part of the present supply.
All interfaces between the components provided for by the LBT Corporation shall be accepted at the suppliers workshops, before shipment to the pre-erection area.
Every possible adjustment and/or other activity that becames necessary after the acceptance, shall be totally charged to the pre-erection Contractor.
The contractor shall predispose the detail procedures and a planning for the pre-erection of all telescope structures and relative subassemblies described in chapters 3.0, 4.0 and 5.0, on the basis of the following sequence:
9.1 Prearrangement of the foundation works and installation of all laying, assembly and alignment equipment (templates, etc.)
9.2 Laying and adjustment of the Central Bearing System
9.3 Laying and adjustment of the Azimuth Ring System
9.4 Assembly (completion) and adjustment of the remaining components of the Azimuth Rim Gear Wheel
9.5 Assembly and leveling of the Azimuth mechanical devices
9.6 Assembly of the central part of the Azimuth Frame over the mechanical devices (Phase 1/7(4/7)
9.7 Assembly of the Azimuth Hydrostatic Pads on the lateral elements of the Azimuth Frame
9.8 Assembly of the lateral elements of the Azimuth Frame on the mechanical devices (Phase 5/7(6/7)
9.9 Connection and fixing one to the other of the Azimuth Frame elements
9.10 Lifting of the Azimuth Frame through the Jacking System
9.11 Elimination of the thicknesses placed over the mechanical devices
9.12 Lowering of the Azimuth Frame (Pads) on the Azimuth Ring (Phase 7/7)
9.13 Fixing of the upper flange of the Central Bearing System to the Azimuth Frame
9.14 Setting at work of the Azimuth Hydrostatic System
9.15 Check of the concentricity and circularity of the tracks with respect to the Central Bearing System (possible adjustment of the fixation of the Central Bearing support to the foundations) referred to the machined surface of the strip encoder with regards to the fixing flanges of the drives
9.16 Assembly of the Azimuth drives and adjustment of the couplings between drives' pinions/rack
9.17 Rotation of the Azimuth Frame and disassembly of the mechanical devices
9.18 Assembly and adjustment of the Elevation internal radial and axial pads
9.19 Check of the geometry of the support and the Elevation axis with respect to the pads
9.20 Assembly of the first C-Ring, completed with rim gear sectors, and fixing to the support structures, by adjusting the vertical and horizontal positions of the flanges for the coupling to the supporting arms (Phase 1/42(7/42)
9.21 Assembly of the second C-Ring as indicated for the first one and check (Phase 8/42(10/42)
9.22 Assembly of the supporting arms of the M1 Cell (Phase 11/42(12/42)
9.23 Assembly of the supporting arms of the Spiders (Phase 13/42(14/42)
9.24 Assembly of the windbracing structure relative to the supporting arms of the M1 cell, by adjusting the thicknesses between the coupling flanges (Phase 15/42(16/42)
9.25 Assembly of the windbracing structure relative to the M1 cell, by adjusting the thicknesses between the coupling flanges (Phase 17/42(18/42)
9.26 Assembly of the central part of the windbracing structure, by adjusting the thicknesses between the coupling flanges (Phase 19/42(30/42)
9.27 Assembly of the Elevation manual drives and stow pins
9.28 Disassembly of the support structures of the C-Ring (Phase 31/42(32/42)
9.29 Assembly of the external axial pads (Phase 31/42(32/42)
9.30 Setting at work of the Elevation hydrostatic system
9.31 Assembly of the external structures of the windbracings (Phase 33/42(36/42)
9.32 Rotation of the Elevation structure up to bringing the supporting arms of the spiders in horizontal position, by means of the manual drives (Phase 37/42(38/42)
9.33 Insertion of stow pins to lock the rotation of the Elevation structures
9.34 Assembly of the cells and relative dummies (Phase 39/42(40/42)
9.35 Rotation of the Elevation structure in vertical position, by means of the manual drives (Phase 41/42(42/42)
9.36 Installation of all accesses (staircases, gangways, etc.)
9.37 Assembly of the spiders and relative dummies (repeat the operations also in horizontal position)
9.38 Assembly of the M1 covering system
9.39 Assembly of the derotator structure and relative Cable Wraps
9.40 Assembly of the Elevation drives and adjustment of the coupling between drives' pinions/rack
9.41 Assembly and adjustment of the end stops
9.42 Assembly and adjustment of the limit switches
9.43 Assembly of the elevation track protection
9.44 Assembly of the ballast and of the balancing system
The principal scope of the pre-erection is to verify and obtain the tolerances for the installation of each component, as indicated in the drawings and Technical Specifications, as well as check the correct and complete functioning of the Hydrostatic Bearing System and relative requirements, in connection with the tolerances obtained on the structures.
Before disassembling for shipment, all couplings shall be opportunely locked by a pin.
Subsequent to disassembly, but prior to packaging the materials, the Contractor shall store, at its sole expenses, all components, materials and equipment in manner that will reasonably protect such components, materials and equipment against loss or damage.
All steel structure, components and relative equipment shall be packed in such a way as to guarantee:
The contractor shall prepare and submit to the P.O. the Acceptance Test Plan.
The following tests and inspections shall be performed for all supplies listed in chapters 4 and 5 prior to Plant Acceptance, and shall be included in the Acceptance Test Plan:
For the pre-erection activities, the contractor shall predispose and perform all tests described in doc. No. 401e036 (Verification Plan and Acceptance Tests).
Contractor shall prepare a list of recommended spares for P.O. review.
The P.O. shall purchase all desired spares at its sole expenses.
Doc_info_start
Title: TELESCOPE PRE-ERECTION
Document Type: TECHNICAL SPECIFICATION
Source: EIE
>
Issued by: G.MARCHIORI
Date_of_Issue: 01/09/97
Revised by:
Date_of_Revision:
Checked by:
Date_of_Check:
Accepted by:
Date_of_Acceptance:
Released by:
Date_of_Release:
File Type:MS-WORD 6
Local Name: C0301/DOC/401e028E.doc
Category: TELESCOPE AZIMUTH FLOOR
Sub-Category: GENERAL TELESCOPE
Assembly: TELESCOPE TECHNICAL DOCUMENTS
Sub-Assembly: PRE-ERECTION
Part Name:
CAN designation: 401e028
Revision: E
Doc_info_end