BQ Capacity Testing
50% Capacity
75% Capacity
100% Capacity
Spilling Point
DESCRIPTION
SPILLING POINT
During normal operation, point in which the chain could start spilling outside the chain bag.
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100% CAPACITY:
The maximum amount of load chain a bag can contain.
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SAFE WORKING CAPACITY:
The safe amount of load chain a bag should contain to prevent the spilling point condition.
SPILLING POINT - TEST CONDITION
1. Chain bag hanged, attached to a chain hoist.
2. Load chain partially lubricated/dry (worst case scenario).
3. Chain bag filled up in fall-free mode (chain hoist was filling the chain bag).
4. Chain bag not shaken during tests.
5. Chain hoist speed: 8m/min and 4m/min.
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3 tests per type of chan bag/chain size
100% CAPACITY - TEST CONDITION
1. Chain bag hanged, attached to a chain hoist.
2. Load chain partially lubricated/dry (worst case scenario).
3. Chain bag shaken several times.
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We measured 6 sizes of chain bags with two types of chain: 7.9 x 21.7 and 7 x 22 load chain.
During the test we identified a common pattern which helped us to reach the conclusions we’ll state below.
COMMENTS
Within each spilling point test, we noticed that the length of chain necessary to reach a dangerous condition (a chain link above the upper edge of the chain bag opening), varies a lot. We recorded the worst case value of the 3 tests we perform for each chain bag.
In some circumstances a 75% capacity would just guarantee a safe working capacity, in other cases 75% was not enough.
For 7.9 x 21.7 and 7 x 22 load chain
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RSCBL013 - BQ Chain Bag 34 small:
safe working capacity is within 50% of chain bag capacity
RSCBL010 - BQ Chain Bag 42 standard:
safe working capacity is within 50% of chain bag capacity
RSCBL012 - BQ Chain Bag 58 large:
safe working capacity is within 75% of chain bag capacity
RSCBL016 - BQ Chain Bag 75 large:
safe working capacity is within 75% of chain bag capacity
RSCBL014 - BQ Chain Bag 88 large:
safe working capacity is within 75% of chain bag capacity
RSCBL015 - BQ Chain Bag 98 extra large: safe working capacity is within 50% of chain bag capacity
CONCLUSIONS
The test confirmed that a chain bag average safe working capacity might correspond to 50% of the chain bag capacity, although in certain circumstances 75% of capacity could be considered safe.
The 50% capacity parameter is also in line with the technical requirements as listed in some European Code of Practices concerning the use of electric chain hoists in the Entertainment Industry.
BiQuadro’s chain bags capacity data will remain untouched.
As a general guidance, Biquadro recommends to use 50% of chain bag capacity as safe working capacity.
In the absence of any installation information, Bi Quadro safety recommendation is to use a chain bags up to 50% of its full capacity
