Manntek DCC Original operating manual

DCC Ser
vice instruction
1” tank unit
manntek.se

2 of 8 - Version 170517

3 of 8 - Version 170517
T ANK U NIT 1”
M ATERIAL : SS
P ARTS NEEDED FOR SERVICE : Spare part kit and O-ring kit (see page 4)
T YPE OF CONNECTION : Threaded and Flanged couplings have the same
service instruction. The cap is part of the tank unit.
P ERFORM A SERVICE : If leaking
According to application service plan
P LEASE NOTE !
Make sure that you are using no grease for cryogenic applications.

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M
AINTENANCE AND SERVICE INSTRUCTION
Always depressurise the system and rinse off the parts before beginning any
maintenance work. Use protective goggles.
Use tweezers and wear gloves which are sufficient for cryogenic applications.
Do not touch adjacent parts with unprotected hands. Rinse off the parts once again
before starting the “daily inspection”
D AILY INSPECTION
1. Inspect the coupling surface for cleanliness and corrosion.
2. Inspect the O-ring in the tank unit connection for serviceability and correct seating in the
grove.
3. Inspect the tank- and hose unit for faultlessness and external signs of seizure.
R EGULAR SERVICE
Regular service interval is very much depending on local regulations and application
conditions. If nothing else is specified and it is a new application with unknown parameters
we recommend to make a first service after one year and decide then depending on the
inspection result about further intervals.
The service procedure shall be as follows:
1. Exchange sealing.
2. Replace worn or damaged components.
Check the state of the connection surface and verify that it is clean before proceeding with
the connection.
Couple the repaired unit to a serviceable hose or tank unit as appropriate and check for
correct operation of the valve actuating and bayonet locking mechanism. Couple and
uncouple the unit(s) several times.
U SE ONLY ORIGINAL M ANN T EK SPARE PARTS FOR MAINTENANCE .
Seal kit (O-LC1-06)
Spare part kit (S-LC1A-44)
Service kit cap (S-CC1A)

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Unscrew the three screws (pos.25, see
drawing page 3) in the spindle steering. Press
down the spindle steering and turn it free.
Release it carefully.
Piston guide is spring loaded.
Risk of injury.
Using our special tool makes work easier
and therefore increases safety.
Take out all the parts from the body (spindle
steering, spring cap, spring).
Replace damaged parts if necessary.
Take out the piston as shown on the picture.
Replace the O-ring (pos.3) on the piston with
a new O-ring.
Make sure that the seal doesn’t get
scratched when mounting.

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To insert the piston back again it should be
put in a relaxing position in the valve seat
Put the spring (pos.7), spring cap (pos.6) and
the spindle steering (pos.4) back into the
body.
Press down the spindle steering and
turn, to fix it in its position.
Make sure that the spindle steering is in its
right position. Mount back the three screws to
hold the spindle steering in place.

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Replace the sealing ring (pos. 22) by a new
one.
Make sure that the sealing surface in
the bottom doesn’t get scratched, not
the seal either when mounting.
If needed replace the sealing ring in the dust
cap by a new one.
Check that the spring and the rollers of the
cap are in working properly. Replace them if
necessary.
Finally, make a visual inspection that
everything is in its right place. Do also a test
connection/disconnection with a hose unit
that not is mounted and not has any fluid
inside.

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TEST
PROCEDURE
After each service a tightness test of each coupling is mandatory.
The following test parameters are in accordance with EN12266 and EN14432:
Test procedure Test pressure Acceptance criteria
Tightness test (liquid
nitrogen) 6 bar +/- 1 bar
No visually detectable
leakage for the duration of
the test
Table 1 – Test pressure
Size
Cooling down
Keeping time
DN 25
5 min
30 s
DN 50
10 m
in
45 s
DN 65
12 min
60 s
DN 80 15 min 60 s
DN 100
18 min
90 s
DN 150 20 min 120 s
Table 2 – Minimum test duration
T EST P ROCEDURE :
•Connect the hose unit to the tank unit
•At the beginning the couplings shall be cooled down by opening the tank with liquid nitrogen
for the cooling down time specified in Table 2.
•Maintain the test pressure for the keeping time specified in Table 2.
•Determine the leakage rate.
•Disconnect the hose unit and the tank unit.
•Maintain a test pressure of 5 bar in the tested unit(s) for the keeping time specified in Table 2
•Determine the leakage rate while depressurizing the Units.
S TORAGE
Store coupling in a dry, dust free, dark place, in ambient temperature.
© Copyright 2008 Mann Teknik AB. Mann Teknik AB reserves the right to make changes at any time in
prices, materials, specifications and models and to discontinue models without notice or obligations.