KC 13.750 User manual

13.750
Gravity Corer –Ø140 mm
Manual
KC Denmark A/S
Research Equipment
Limnology ⚫Oceanography ⚫Hydrobiology

13.750 –Gravity Corer –Ø140 mm - Manual
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Gravity Corer –Ø140 mm
The gravity corer is very dangerous in unskilled hands, and you must take
serious precautions to avoid accidents.
KC Denmark A/S is not, and cannot be held, responsible for any damage(s)
made to equipment or to operators who ignore safety precautions or because
of misuse or wrong operation.
Never walk under the gravity corer when lifted by the winch.
Standard delivery comes with these items:
A. Main rack with support for 20 lead weights, each 80 kg
B. Top part with non-return lid
C. 2 lead weights, each 80 kg (13.759)
D. Sample tube, stainless steel, length 5 m (13.765)
E. Internal liner, length 5 m (13.768)
F. Carver (13.757)
G. Orange peel (13.758)
Sample depth:
Sample tubes are available in lengths of 5 m. We recommend a max. length of 25 m in soft or muddy
sediment.
Piston corer functionality:
All our gravity corers support an extension kit, adding piston corer functionality thus having a versatile 2
in 1 product, where you can switch forth and back within few minutes. For this corer you may add order
no. 13.795.

13.750 –Gravity Corer –Ø140 mm - Manual
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Item
Preparation
1
Place the necessary number of lead weights on the
main rack (pos. A). Align each weight, so it is locked
by the small pins beneath the handles.
2
Two lead weights, A and B, have been added.
“C” shows the small locking pins for the weights. Add
the supporting frame “D” and tighten 3 bolts “E”
Gravity corer option:
3
For gravity corer operation you must mount the unit
with the top lid.
Fasten the unit and secure with the M8 x 16 bolt “A”
Ensure the black rubber “B” is free of dirt.

13.750 –Gravity Corer –Ø140 mm - Manual
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4
Open the fastening device and push the tube with the
mechanical stop into the bottom. Lock the handles, “C”
and “D”, and secure with a bolt.
5
The handles are now closed correctly. Secure the
handles with a bolt, “E”
6
You may add more tubes, using the coupling device
13.756 and fasten with spikes.
7
Mount the orange peel “G” inside the sample tube and
you can now attach the carver “F”.
Fasten with spikes.
8
The gravity corer is now ready to be lowered into the
sea. You must control the speed and lower at a
reasonable speed, otherwise the corer may tilt over,
and you get no sample.

13.750 –Gravity Corer –Ø140 mm - Manual
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Piston corer option
9
Requires an extension kit 13.795, shown to the right.
The principle for operating the piston corer function:
An AISI 316 stainless steel heavy-duty releaser (pos.
1), based on the Kullenberg principle, is mounted at
the top. Up to 20 lead weights (pos. 4) of 80 kg, each
can be added. The upper part of the corer is made of
AISI 316 stainless steel.
The corer tube (pos. 9) is made of AISI 316 stainless
steel (Ø140/Ø130 mm). At the end of the releaser
hook (pos. 1); the 30 kg release weight (pos. 7) is
mounted.
A piston with a leather seal, (pos. 8) is positioned at
the bottom of the corer tube. The piston is connected
to the releaser (pos. 1) by an Ø8 mm stainless steel
AISI 316 steel wire. During the deployment the corer
tube (pos. 9) is released 1,7 meter above the sediment
as the releaser weight reaches the sediment surface.
The wire (pos. 8), which has a slack of about 1 meter,
allows the corer tube to fall free until the piston (pos.
7) is activated just before the corer tube enters the
sediment. The total weight load can regulate the depth
of penetration. (pos. 4).
The principle for operating the piston corer function:
1. Kullenberg releaser
2. Wire (Ø8 mm) for piston
3. Steering fins
4. Lead weight
5. Lock for corer tube
6. Wire (Ø5 mm) for Kullenberg releaser and 30 kg
weight station
7. Weight station, 30 kg
8. Piston
9. Corer tube
14. Safety split
NOTE:
When using other lengths of sample tubes, the length
of the two steel wires must be changed accordingly.

13.750 –Gravity Corer –Ø140 mm - Manual
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10
Remove the upper part from the main rack and mount
the upper part for piston corer.
Fasten the unit and secure with the M8 x 16 bolt, like
item 2.
11
Attach the Kullenberg releaser arm with the bracket
and mount two bolts, “F” and “G”

13.750 –Gravity Corer –Ø140 mm - Manual
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12
Mount the security lock for the Kullenberg to avoid any
unattended release. Lift the release arm until the lock
fits for the square hole, insert and lock.
13
The wire from the weight station is attached to the end
of the arm of the Kullenberg releaser
14
A wire-tightener (i.e., 2 pcs PE-HD plastic plate’s
arrangement) is placed at the top of the main rack.

13.750 –Gravity Corer –Ø140 mm - Manual
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15
Dismount the piston from the wire, see item 9, pos. 2.
Guide the wire to the main rack and the core tube and
mount the piston again. To ensure the piston will be in
right position during the sample taking, adjust the
wire-tightener, so the wire can be moved easily by
hand, but the piston will remain in the core tube.
16
Guide the wire (with the swivel in front) through the
main rack and the corer tube. The swivel must remain
at top of the main rack).
17
Before inserting the piston at the bottom of the tube,
make sure the white cord does not get stuck by the
piston.
18
Push the piston into the tube having a free space of
3-4 cm from the end of the tube; on the photo, the
piston remains 5-6 cm to have a correct insertion.
19
Mount the wire with the swivel part at the piston
outside the end of the corer tube. Then press the
piston into the corer tube on level with the corer edge.

13.750 –Gravity Corer –Ø140 mm - Manual
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20
The piston for piston corer function.
When the sample has been takes, there is a huge
vacuum at top of the piston and pulling the white cord
will align the pressure. Otherwise, it’s very difficult to
remove the corer tube.
21
Tighten the PE-HD arrangement a little bit to ensure
against a piston fall-out at sudden movements. Use
bolts “J” and “K”.
22
Mount the wire end with its steel thimble to the
Kullenberg releaser (item 9, pos. 1) by the steel bolt.
(Do not forget to make a control check).
23
You may now attach the liners into the steel tube
adding the orange peel system and the carver. Fasten
with two spikes.
For different lengths of corer tubes the steel wires
much be replaced with the corresponding length.

13.750 –Gravity Corer –Ø140 mm - Manual
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24
The piston corer is now ready for deployment.
When the piston corer is hinged outboard the ship,
remove the safety-lock (pos. 14) and the piston corer
is ready for use.
25
WARNING: Never remove the safety lock before
the piston corer is outboard the ship. It poses
great danger for personnel to remove the safety
lock inboard the ship.
Emptying the corer tubes
26
Requires the following items:
•13.761 –Piston rod
•13.760 –Drum with ratchet device
•13.762 –Detacher for the tube
•13.784-140 –Trestles, see item 35, alternatively
the ship’s deck
The photo shows the tube detacher.

13.750 –Gravity Corer –Ø140 mm - Manual
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27
If you cannot remove the sample tube by hand, use
the tube detacher. Tighten the handle, grab the black
handle and now you can loosen the tube.
28
Place the corer tube horizontally on 2 trestles (see
item 35) or on deck.
If you cannot remove the piston due to heavy vacuum,
pull the white cord to align the vacuum.
29
Fasten the ratchet device by means of A and B.
Do not over tighten A and B, as it may cause damage
to the PVC tube; furthermore, the piston may be stuck
because of the deformation of the tube.
30
Insert piston B at the end of the sample tube and then
slide adapter A down the steel tube. The smallest
diameter of the adapter must point towards the sample
tube.
31
Insert the tube with the wheel at opposite end of the
steel tube; the tube has a small hole. Align this hole
over the Allen screw; unscrew the Allen screw
counterclockwise to lock the tubes.

13.750 –Gravity Corer –Ø140 mm - Manual
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32
The adapter A will fit into the sample tube to centre
the piston rod during ejection.
33
The adapter A is now in the correct position.
34
Push D and release C; now the lock for the wire has
been disabled, pull out the wire E and guide it over the
wheel, see item 32/33. Attach the wires snap hook to
the eye F.
Push C into opposite position and by turning the
handle forth and back, you will now force the piston
through the sample tube ejecting the sample.
35
Trestles made of AISI 316 stainless steel will secure
the core tubes in a convenient working height.
We can provide replaceable jaws of different sizes
allow using a wide range of tube diameters.
Storing and Maintenance
All parts of the item can be rinsed using salt water or fresh water. Before storing, we recommend a
thoroughly cleaning with fresh water.

13.750 –Gravity Corer –Ø140 mm - Manual
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Safety Regulations
KC Denmark A/S is not, and cannot be held, responsible for any damage(s) made to equipment or to
operators who ignore safety precautions or because of misuse or wrong operation.
An expert maintenance technician fully familiar with the attendant hazards must only do all maintenance,
inspection and repairs.
When working with the unit in areas, which are difficult to access or hazardous, ensure to take adequate
safety precautions for the operator and others in compliance with the provisions of law on health and
safety at work.
Replace worn component with original spare parts.
Rev.: January 31, 2022 - lkj
KC Denmark A/S
Research Equipment
Limnology ⚫Oceanography ⚫Hydrobiology
E-mail: [email protected] website: http://www.kc-denmark.dk/
Holmbladsvej 17-19, DK 8600 Silkeborg, Denmark. Tel. [phone]
Bank: Sydbank. SWIFT: SYBKDK22 - IBAN DK5070460000104832
VAT no. DK 29 61 96 62