Fig. 1 - Air operated “Advance” Model “C” Spider with full circle
replaceable inserts
The “Advance” Spider developed by Cavins Oil Well Tools is
considered to be the pioneer in power slips. Through years of
experience and testing, many improvements have been made
which make the Cavins “Advance” Spider the leader for a safe,
economical, and trouble-free handling of tubular goods. Heat treated
alloy steel is used throughout for the greatest possible strength
and the longest wearing life with a minimum of weight. The shafts
are hardened alloy steel for longer life. Replaceable steel bushings
are fitted into the journal bearings. All bearings and journals are
equipped with grease fittings for lubrication.
Air Cylinders and Foot
Valves are mist lubricated through the airstream. All Cavins
“Advance” Spiders are equipped with a manually operated safety
latch which may be used to positively lock the slips in their set
position. Because of the low operating pressure the slips cannot
release from the tubing until it has been raised by the elevators,
thus guarding against a lost string in the event that the Foot Valve
is tripped accidentally. The Slips, Shafts, and Air Operating
Mechanisms are protected by guards to prevent damage caused
by the elevators or other outside forces. Through research and
field testing our engineers are constantly on the look out for additional
improvements which will assure the personnel in the field of
receiving the safest and most maintenance free equipment that is
available.
Fig. 2 - Advance Mode “B” Spider (Hand Operated)
The Cavins “Advance” Spider is available in five models, Model
“B”, “C”, “C-HD”, “F”, and “G”. All are designed for manual, compressed
air, or hydraulic operation with the exception of the Model
“G” which is available for compressed air or hydraulic operation
only.
All Cavins “Advance” Spiders may be used on a rotary table
with an adapter plate that fits into the square drive or pin drive
master bushing, centering the Spider on the rotary table. This also
permits the manually operated Spider to be rotated.
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Models “B”, “C”, and “C-HD” Spiders may be equipped with a
Gate and Slips which are relieved to pass parallel strings of tubing.
If the Spider is to be used with both single and parallel strings
to any extent, it is recommended that both kinds of Slips and
Gates be ordered. A standard feature of all Cavins “Advance”
Spiders is a specially designed Gate Section which will allow the
running of an electric submersible pump cable simultaneously with
any size tubing string.
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Fig. 1 - Air operated “Advance” 
Fig. 2 - Advance Mode “B” 
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