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LHC-DFBX

Shipping Specification

Steve VirostekLBNL

Presented at theDFBX RFP Review

23-24 October 2002, LBNL

Brookhaven - Fermilab - Berkeley

US LHC ACCELERATOR PROJECT

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Presentation Summary

Shipping Specification Details• Introduction• Description, Destination and Schedule• Crate Performance Requirements• Preparation for Shipping• Instrumentation• Shipping Crate Features• Acceptance Criteria

Shipping Load Analysis• Approach• Scope• Results

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Shipping Spec Introduction

LBNL is designing 8 DFBX’s for LHC

Each feedbox shipped in its own fully enclosed crate• Shock and vibration protection, environmental control

Specification gives shipping crate design requirements• Hardware geometry, allowable accelerations, etc.

Fabrication vendor has all shipping responsibilities• Design and fabrication of crates• Arrangement and coordination of shipping• Schedule specified in the RFP Statement of Work• LBNL responsible for Customs clearance and duties (if any)

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Description, Destination and Schedule

Shipment Description

• Eight boxes given by six LBNL top-level assembly drawings

• Figure shows 3D model image with overall dimensions

• Figure shows location of center of mass for DFBX “G” box

Destination and Shipping Dates

• Spec gives shipping address and contact at CERN

• Vendor chooses appropriate transport mode to meet schedule

• >1 feedbox in same shipment acceptable (separate crates)

• Feedboxes must satisfy the Acceptance Criteria Document (LBNL Engineering Spec M989) before and after shipping

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DFBX Overall Dimensions

82 in.

128.5 in.

41.5 in.

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DFBX “G” Box Center of Mass

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Crate Performance Requirements

Analysis performed to determine DFBX tolerance to shock

• Details of analysis in LBNL Engineering Note M8043

Maximum vertical shock transmitted to feedbox: +5.0g

Maximum horizontal shock transmitted to feedbox: +2.0g

Fully loaded crate has a 1st mode >5 Hz and <10 Hz

Drop height requirement: 6” with <5 g’s transmitted to feedbox

Feedbox supported uniformly across bottom surface

• Jack mounting points not used for support within crate

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Preparation for Shipping

Various DFBX components to be backfilled before shipping

• Described in Acceptance Criteria Document (Spec. M989)

Added supports used to restrain internal piping as required

• Installed through the feedbox end flanges

D1, Q3, JC1 and JC2 flange caps support ends of pipes

All other external piping restrained as appropriate

High current leads to be protected by covers or shields

• Prevents damage during loading/unloading

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Shipping Crate Instrumentation

Four self contained, tri-axial acceleration acquisition systems (transport loggers) used per crate• Two used inside crate on feedbox, two outside• Full scale range of +10 g’s on all units• Data to be stored over duration of shipment• Capability to read data during shipment

Detailed accelerometer specs provided by LBNL

Re-use of accelerometer systems permitted

Vendor to provide data records to LBNL

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Shipping Crate Features

Vendor to incorporate the following features:

• Full enclosure of the feedbox on all sides

• Sufficient interior restraint to prevent shifting

• Supported only on vacuum box 1.25” thick exterior surfaces

• Exterior features allow tie down and lifting by crane/forklift

• Sized to allow lifting by crane with 17 ft maximum hook height

• Provision for repeated feedbox access without crate damage

• Protection from prolonged exposure to weather

• Warning labels in multiple languages (fragile, shock recorders)

• Warning labels against tipping or stacking of crates

• Extra interior space in crate for miscellaneous DFBX hardware

• Welds used in crate fabrication conform to AWS Code

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Acceptance Criteria

LBNL to evaluate crate design in a preliminary design review

• Vendor responsible for crate performance, regardless of any implied approval by LBNL

Success of shipment to CERN based on satisfaction of the Acceptance Criteria Document requirements (M989)

Source of any excessive shock loads to be identified by vendor and eliminated in future DFBX shipments

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Analysis Approach

Analyze acceleration limits of LHC primary components and sub-systems to shock and vibration loading

Develop new or use existing FEA models where needed

Differentiate between axial, lateral and vertical directions

Establish overall shock loading acceleration limits

Calculate natural frequencies of system components to determine response characteristics to cyclic loading

Identify internal or external components that require additional support during shipping

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Analysis Scope

Vacuum box including weight of internal components

Liquid helium vessel structure, supports and bellows

Thermal shield stresses and deflections

Surge tank supports including thrust bracket

High current leads (vapor cooled and HTS leads)

Bus duct free end support

Other internal pipes and external free ends

Pipe support spiders (Q3, D1, QRL and center spiders)

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Analysis Results

Vacuum Box - stresses and vibrational modes from FEA model

• box stresses < allowable for10 g’s in any direction

• lowest vibrational mode: 22 Hz lateral (LHe vessel bellows)

• all other modes are >35 Hz

Helium Vessel - support loads & bellows deflections from FEA

• shipping loads minimal compared to test pressure (>10 g’s)

• tank supports: 8.6 g’s axial (lower support brackets), 10.4 g’s lateral (vert. suppt. buckling), 18 g’s vertical (struts)

• bellows limits of travel: 4.5 g’s lateral, 31 g’s axially, no limit vertically due to vertical struts

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Analysis Results (continued)

High Current Leads• HTS lead cantilevered ends: >10 g’s in all dir. (G-10 sleeve)• HTS terminator ear:17 lb with 175 lb allowable force (~10 g)• vapor cooled leads:16” free length resulting in 32 g limit• vapor cooled leads deflect ~10 mils at ends under 1 g loading

Thermal Shield: FEA results for portions of thermal shield• stress limits: 12 g’s vertically, 5 g’s laterally

Surge Tank• 20 g vertical limit based on axial strength of G-10 supports• 3.5 g axial limit based on bending of G-10 supports• 12 g lateral limit based on tension and bending in supports