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Gus Sampler0 pages
Bulletin 9
acker
DRILL COMPANY
GUS SAMPLER
(Gregory Undisturbed Sampler)
This unique, air or hydraulic piston sampler was designed
and test proven in the drilling field for many years. The
design allows the sampler to be classed as a truly undis-
turbed piston sampler producing high production sampling.
IN OPERATION
HOW IT WORKS
The GUS Samper is assembled on a drill rod and
lowered to the bottom of a cleaned bore hole.
The drill rod may be chucked by means of a
chucking rod. A water swivel is attached with a
hose line coupled to the swivel and the pressure
pump.
As the water or air pressure is applied to the drill
rods at approximately 100 to 600 PSI, the piston
in the head of the assembly forces the thin wall
sample tube in the soft underlying soil or clay
materials to take the sample.
Once the sampler reaches the end of its maxi-
mum travel, the water or air used for pressing
exhausts through a relief hole and returns im-
mediately to the surface. This is a signal to the
operator that the sample has been taken to its
maximum depth.
Depending upon the materials being sampled,
the sampling may take only a few seconds or
as much as one minute to reach its maximum
travel.
A compressed air bottle or tank may be used
in lieu of a fluid pump for pressing the sample,
however, one must be careful to limit tank pres-
sure to prevent "over pressure" which may col-
lapse the sample tube.
After the sample has been taken, the rods and
sampler are pulled to the surface and the sam-
pler is layed out on the work table for removing
of the sample tube containing the sample.
The outer tube of the sampler containing the
sample is rotated in a counter clockwise direc-
tion three turns which releases the "vacuum
lock" created over the sample in the sample
tube and allows for easy removal of the sample
tube from the assembly. A new sample tube is
then installed on the sampler head for addition-
al tests and the procedure repeated.
Cylinder
Cap Screw
Outer
Cylinder-
Pressure Inlel
Vacuum Lock
Release Port
Tube
Cap Screw
Stationary Piston
(Not Shown)
24 Inch Length
Undisturbed Sample
30 Inch ASTM
- Sample Tube
□ RILL COMPANY
(1) The hole is drilled by rotary means and pre-
pared by using either casing or drilling mud to
support the overburden.
(2) The drill rods extending the sampler to the
bottom of the hole may be clamped to the cas-
ing to prevent upward movement from down
thrust of fluid or air pressure used...or rods may
be connected to the chucking rod in rotary drill
head.
(3) A water swivel or adaptor is used to direct
fluid or air into the drill string to operate the
sampler.
(4) A positive displacement pump or com-
pressed air is used to exert pressure on the sta-
tionary piston of the sampler. Pressure range
normally required is 100 to 600 PSI for at least
one minute.
FEATURES OF THE GUS SAMPLER
Bore hole size need not be larger than sampler
size in use.
Available in 4 popular sizes - 2-1/2", 3", 3-1/2",
5" (63.5, 76.2, 88.9 & 127 mm)
Fluid or air under pressure is required to oper-
ate sampler
Simple to operate - there is no need for actuat-
ing rods or complicated procedures
Uses standard ASTM thin wall steel sampler
tubes with standard holes and cap screws
Sampler adapts directly to standard AW or NW
drill rods
Used in holes cased with mud, steel casing or
self supporting auger holes
Piston closes off sampler until sample is taken
Maximum length of sample recovered is 24"
(609.6 mm)
Maximum pressure required -100 to 600 PSI
Stainless steel actuating cylinder
Drill rig is not necessary for sampling; how-
ever, hoist is required to lift tools and sampler
from the drill hole
Inexpensive when compared to other compa-
rable types of samplers
P.O. Box 830, Scranton, PA 18501 USA
Toll Free: 800.752.2537 Fax: 570.586.2659
E-Mail: sales@ackerdrill.com Website: www.ackerdrill.com
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