shock, vibration, temperature, and humidity
TRANSCRIPT
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Shock, Vibration, Temperature, and Humidity
Mervin Richard, Chief of Conservation National Gallery of Art
November 6, 2014
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Crystal Palace Hyde Park, London,1851
6,200,000 visitors
14,000 exhibitors
Art on the Move
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The Big Question
Yes Go for it!
No Forget it!
Can the object be moved with Minimal risk?
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Agents of Deterioration
! Vibration " ! Shock " ! Temperature " ! Relative Humidity " ! Light
! Pollutants " ! Water ! Pest " ! Fire ! Vandalism
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Typical Causes of Damage During Shipment
Issue%% How%it%causes%damage%%
Fundamental*
problems**
• ****Collision*of*loose*object*parts*• ****Collision*of*loose*objects**• ****Collision*of*loose*objects*with*the*packing*case**• ****Abrasion*• ****Deforma;on*of*packing*case*• ****Damage*during*handling*prior*to*packing/shipping*
Excessive*force**• ****Inadequate*shock*protec;on*• ****Inadequate*vibra;on*mi;ga;on**
Based on information provided by Paul Marcon, CCI
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Issue%% How%it%causes%damage%%Lack*of*restraint*in*
transit**• ***Repe;;ve*bouncing*of*cargo*• ***Stacked*items*falling*in*moving**vehicles**
Environmental*hazards**
• ***Extreme*heat*or*cold*• ***Extreme*RH***• ***Water*(e.g.*rain*or*snow).*Pests.**• ***Pollutants*(poor*quality*packing*materials)***
Extreme*hazards** • ***Inten;onal*mishandling*of*packages.**• ***Vehicle*accidents*
Based on information provided by Paul Marcon, CCI
Typical Causes of Damage During Shipment
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Vibration
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Vibration
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Vibration
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Vehicle Vibration
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Vibration
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Vibration
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Air-Ride Suspension
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Vibration
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Paul Marcon, Canadian Conservation Institute
Vibration
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Paul Marcon, Canadian Conservation Institute
Vibration
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Vibration Testing (Data Physics, Corp.)
Vibration
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Truck Vibration Environment
! Typically random vibration ! Higher vibration levels than aircraft ! Air-Ride Suspension is recommended ! Greatest concern
! Low frequency vibrations with large displacements
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A mechanical or physical shock is a sudden acceleration or deceleration caused, for example, by impact, drop, kick, earthquake, or explosion
Shock
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Shock
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! That which causes an object with mass to change shape, direction, or speed
! Force = mass x acceleration
Force
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! Poundal ! English unit of force ! Force to accelerate one pound at a
rate of one foot per second squared ! pdl = lb ft/s2
Force
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! Acceleration relative to free-fall ! Unit-less ! Easier to use
g- force
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Shock
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Shock
FOAM
EGG SLOW
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Shock
FAST
FOAM
EGG
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Shock
SLOWER
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Shock
STOPPED
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Shock
STOPPED
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Shock
EGG STRIKES BOTTOM
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Shock
Foam Cushions
Inner Case
Outer Case
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Shock
FOAMCOMPRESSES ON IMPACT
PROPER STATIC LOADING
FLOOR
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Shock
Foam CusionToo Hard or Rigid
Improper Static Load
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Shock
Tandem Cushioning
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Shock
Tandem Cushioning
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Tandem Cushioning
Shock
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Extremely Fragile 15-25 g’s Missile guidance systems, precision aligned test instruments, plaster sculpture
Very Fragile 25-40 g’s Mechanically shock-mounted instruments and
electronic equipment, scientific instruments, x-ray equipment, some unfired clay , fragile glassware
Fragile 40-60 g’s Aircraft accessories, printers, most solid state
electronic equipment, low-fired clay, some plaster, some glassware, some ceramics
Moderately Fragile 60-85 g’s Aircraft accessories, computer displays, unfired
clay, low-fired clay, some plaster, some glassware, some ceramics
Moderately Rugged 85-110 g’s Major appliances, furniture, un-cracked, brittle, canvas painting
Rugged 110 + g’s Table saws, machinery
Fragility
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Package Weight
(lb) Type of Handling
Drop Height (in.)
0-20 1 Person Throwing 42 21-50 1 Person Carrying 36 51-250 2 Persons Carrying 30
251-500 Light Equipment Handling 24
501-1000 Medium Equipment Handling 18
1000 Heavy Equipment Handling 12
Fragility
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Drop Height Generalizations According to Fred Ostram and W. D. Godshall
! The probability of a package being dropped from a higher height is minimal.
! Most packages receive many drops at low
heights while relatively few receive more than one drop from higher heights.
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! Unitized loads are subjected to fewer and lower drops than are individual packages.
! Most packages are dropped on their bases. In most studies, base drops have averaged over 50% of the total number of drops.
! The heavier the package, the lower the drop height.
Drop Height Generalizations According to Fred Ostram and W. D. Godshall
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! The larger the package, the lower the drop
height. ! Handholds reduce the drop height by lowering
the container relative to the floor during handling.
! Labels such as fragile and handle with care
have some effect but can be considered minor.
Drop Height Generalizations According to Fred Ostram and W. D. Godshall
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Drop Height Generalizations
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Drop Height Generalizations
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Static Load
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Static Load
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Cushion shape not important If load is stable
Static Load
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Cushion Buckling
Inner Case
Foam Cushion
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BUCKLING
Cushion Buckling
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Dynamic Cushioning Curves
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Dynamic Cushioning Curves
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Dynamic Cushioning Curves Ethafoam 220, 400, 600, 900
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Compression Creep
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Shock
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Polystyrene
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Risk in Handling
Shock
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Temperature in Transit
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Temperature in Transit
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Temperature in Transit
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! Some materials become more brittle at lower temperatures
! Some materials become tacky at higher temperatures
Temperature in Transit
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Temperature-Related Damage
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Temperature-Related Damage
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Temperature-Related Damage
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Environmental Chamber
-40° to 400° F, 10% to 85% RH (from approximately 40° to 200° F)
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What Would TSA Say?
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0
1
2
3
4
5
6
7
8
Axis%Title
Thermal%Resistance%(R2value)
Plywood
Polyethylene4Foam
Polystyrene4Foam
Flexible4Polyurethane4Foam
Rigid4Polyurethane
Insulating Value Of Packing Foams
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0
5
10
15
20
25
0 10 20 30 40
Tem
pera
ture
(C)
Hours1 Hour 3 Hours 5 Hours
Thermal Half Times Packing Cases
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Relative Humidity
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Relative Humidity
The ratio of the amount of water vapor in the air at a specific temperature to the maximum amount that the air could hold at that temperature, expressed as a percentage
Free Dictionary Online
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Relative Humidity
Flaking Paint
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Relative Humidity
Flaking Paint
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Relative Humidity
John Singleton Copley Portrait of Eleazer Tyng
1772, Oil on Canvas National Gallery of Art
Varnish Bloom
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Relative Humidity
Corrosion
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Relative Humidity
Mold
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Environmental Specifications National Gallery of Art
Temperature 70° F ± 5° F (21° C ± 2.5° C)
Relative Humidity
50% ± 5%
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Environmental Specifications
Relative Humidity 50% ± 5%
Relative Humidity 55% ± 5%
Relative Humidity 45% ± 5%
Relative Humidity 55% ± 2%
Relative Humidity 50% ± 5% (summer) 45% ± 5% (winter)
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Relative Humidity in Transit
Proper packing can minimize variations in relative humidity
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Wrap in Plastic
When Painting Equilibrated to a Relative Humidity Below 65%
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Microclimate Packages
Titian Italian, c. 1490 - 1576 Cardinal Pietro Bembo c. 1540, oil on canvas
Samuel H. Kress Collection, 1952.5.28
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Microclimate Packages
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Lorenzo Lotto - St. Catherine on Loan in Microclimte Case
404550556065707580
3/11/98 5/11/98 7/11/98 9/11/98 11/11/98 1/11/99
Date
Tem
per
atu
re (
F)
Bergamo Paris
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Lorenzo Lotto - St. Catherine on Loan in Microclimte Case
20
30
40
50
60
70
80
3/11/98 5/11/98 7/11/98 9/11/98 11/11/98 1/11/99
Date
RH
(%)
Bergamo Paris
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Temperature 50% RH 80% RH 60° F 41° F 54° F 70° F 51° F 64° F 80° F 60° F 73° F 90° F 69° F 83° F
Dew Point Temperature
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Dew Point Temperature
30
40
50
60
70
80
90
100
50 60 70 80 90 100 110
Dew
Poi
nt T
empe
ratu
re
Ambient Temperature
80% RH
50% RH
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Dew Point Temperature
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Pollutants
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Pest
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Thank You for Listening