|EAD21000A STANDARDS FOR TANDEMLOC
SLING & BELOW THE HOOK LIFTING DEVICES
MANUFACTURING & TEST SPECIFICATION NOTES
(unless otherwise specified on the Tandemloc drawings):
||All below the
hook lifting devices are manufactured in accordance with ASME
B30.20 and are proof loaded to conform to that specification and
OSHA 2232 (1918.61), as follows:
|WORK LOAD LIMIT (WLL)
|Up to 40,000 lb.
||25% in excess of
lb.to 100,000 lb.
||10,000 lb. in
excess of load limit
|Over 100,000 lb.
||10% in excess of
wire rope and synthetic pendant slings are manufactured in
accordance with ASME B30.9 and are proof loaded to 200% of the
work load limit.
shackles, hooks, chain connectors and rings are proof tested to
200% of WLL.
container lifting spreaders are proof tested to 125% of the work
||Marking below the hook lifting devices:
||Decals of self adhering
vinyl are used to mark both sides with the work load limit (WLL),
and the Tandemloc logo. Additional marking, when required, shall
be noted on the Tandemloc drawing.
||The WLL limit color is
black and the Tandemloc logo color is red unless otherwise
specified on the Tandemloc drawings.
||Letter height of the
decals are 5" unless space does not allow it. On smaller spaces,
the max. letter height to fit the space is used.
||The WLL marking is located
in central locations so that it is both highly visible and right
side up during use.
||A test certification tag
(AA24000A-CP1) is permanently attached, showing Tandemloc I.D.,
Part No., Serial No., Weight and Work Load Limit.
||A sling leg is metal
tagged (AA24000A) showing use, work load limit, part no., size,
length and Tandemloc I.D.
||Lift components are safety
marked in accordance with ASME Z535.4.O.
WE DESIGN SERVICE CLASS AND LIFE CATEGORY PER ASME BTH-1-2011
Unless otherwise specified on the product drawing, the design
category used is “B" (S.F. 3:1 to yield) and the service life is
Class "O" (up to 20,000 load cycles), except that ISO container
lift spreaders have a service life Class "1" (up to 100,000 load
Cycles). Different design categories and service classes must be
defined by the buyer prior to order placement. The lifting
product will then be custom engineered to meet the specified
SERVICE TEMPERATURES OF TANDEMLOC
|All lift devices and slings sold by
Tandemloc are made in conformance to ASME B30.20 (below the hook
lifting Devices) and ASME B30.9 (slings) unless otherwise noted.
These specifications require the user to perform a pre-lift
equipment inspection and limit the amount of impact and shock
loading to minimal. This is of extreme importance especially
when the service temperature goes below 35°F, and increasingly
important with each degree lower. On this basis, the Tandemloc
standard equipment is useable in temperatures of 150°F down to
25°F. (Temperature range per ASME BTH-1).
The user has the option of purchasing ASME B30.20 below the hook
lifting devices, made for arctic service (reducing the minimum
temperature from 25°F to a range of minus 20°F - minus 50°F.) These
devices may be made from special steels which are produced to
withstand Charpy impact tests made as low as minus 50°F, however
it may not be possible for certain design styles and working
load limits, as materials may not be readily available. The user must
still avoid impact and shock loading and perform the careful
pre-lift inspection noted above, but will have an extra margin
of safety. The high temperature limit is 150°F.
Cold Temperature Considerations and Below the Hook Lifting
Operating lifting equipment (under the ASME B30.20 specification
for below the hook lifting devices) in cold temperatures (below
25°F) does not in and of itself require the use of cold
temperature materials in their manufacture. In fact, as the
temperature drops, steels in general will become stronger with
respect to their yield strengths. What cold temperature does is
tend to make steels become more brittle.
In order for cold temperatures to reduce the safety of a steel
lifting product, there must be a sufficiently sudden and
substantial impact load applied (or vibration loads), along with
a sudden change in material volume in highly stressed areas,
through a given piece of lifting equipment. This sudden change
of volume is more commonly referred to as a stress riser. These
can be in the form of a notch, crack(s), or thin wall attached
to a thick wall, for example. ASME B30.20 expressly forbids the
end user from applying impact or shock loads to lifting
equipment certified under that specification. Without both a
suddenly applied load, and a stress riser, cold temperatures
will have no effect on the safety of a given lifting product. In
fact the safety factor to yield will go up. A stress riser
without impact loading (or vibration) will not be more likely to
cause failure in cold temperatures, nor will impact loads
without a stress riser be more likely to cause failure in cold
temperatures. Tandemloc lifting products are designed with at
least a 3:1 factor of safety to yield, and that safety factor
already considers any stress risers in the system. (all lifting
products should be checked for cracks on a regular basis.)
Slowly applied forces such as should be encountered during a
lift under asme B30.20 will not cause stress risers to lead to
failure more readily in cold temperatures. In fact since the
yield strength Is increased in cold temperatures, the product
will have a greater factor of safety under static or slowly
If impact (or substantial vibration) loads are unavoidable in
your lift, and the design of the lifting product has stress
risers in high stressed areas, cold temperature materials could
be part of the solution for your lifting product. However, it
should be remembered that impact loading is not covered under
the ASME B30.20 specification, and therefore a different
specification may be required for your lifter, which should
consider dynamic loading.
Tandemloc currently designs all lifters to ASME B30.20 which
considers static loading only. We offer cold temperature steels
in our designs as a courtesy to our customers, but these lifters
are still designed to ASME B30.20 and impact loading will void
the warranty as well as be a violation of the specification.
In summary, do not assume that operating your lifts in cold
temperatures alone are sufficient reason to incur the
substantial additional expense of using cold temperature
materials in your lifter. Please talk with your sales
representative and Tandemloc engineering to make an informed
decision about your lifting requirements.
|Pre-lift inspection procedures are noted in ASME B30.20 and ASME
B30.9 available from ASME.
|Tandemloc recommends that before any low temperature lift or
after any accidental damage occurrence that the device is
inspected for cracks, gouges and deep scratches in high stress
areas. Repair and re-test before using.
|ASME B30.9 (2003) defines service
temperatures for sling materials as follows:
Alloy GR80 or 100 steel chain
||400°F to minus 40°F
Steel wire rope IWRC
||400°F To minus 40°F
Steel wire rope with fibre core
||180°F to minus 40°F.
||See specification for
||140°F to minus 40°F.
See specification for certain types which have higher
maximum service temperatures.
|The above supplementary data is for
reference only. Actual service temperatures must be confirmed
when purchasing. Sling assemblies will have fittings and other
components which will affect service temperatures.
|WORK LOAD LIMITS AND NON-UNIFORM
|Unless otherwise stated, Tandemloc
below the hook lifting devices work load limits for I.S.O.*
freight containers are based on a uniformly loaded container.
Non-uniformly loaded containers require a reduction of the work
load limit to prevent a higher loading of a structural container
component than the load occurring in a uniform lift.
*ISO 668 & ISO 1161
|Additional information can be obtained
from the following sources:
ASME B30.9-Slings, ASME B 30.10-Hooks, ASME B 30.20-Below the
Hook Lifting Devices, ASME B 30.26-Rigging Hardware, OSHA
Regulation of CFR 29 1910.184-Slings and ISO 3874 for Container
||Added 4 B. Data.
||ASME was ANSI 3 places.
||Proof load Note 1 said
125% of WLL only. Added shackles, chain conn.,
Hooks, ring,& ISO container spreader proof test data in Note 2.
||Added service temperature
||Corrected spelling &
sentence structure of all words. Added supplementary data. Final
review completed for reissue.
||Added service class & lift
||Added work load limit and
non-uniform loads for I.S.O. containers
||Added applicable standards
||Added “Cold Temperature
Considerations…” (1 Line and 5 Paragraphs)
temperature range was 150 to -40F. Added addition caveats to
cold temp designs.
||BTH-1-2011 was BTH-1-2005