Stübbe Series MDM 902, Original Operating Manual

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Maintenance
7 Maintenance
WARNING
Risk of injury and poisoning due to hazardous media liq-
uids!
Use personal protective equipment when carrying out any
work on the
fi tting.
7.1 Servicing
1. Visual and function check (every three months):
– Normal operating conditions unchanged
– No leaks
– No unusual operating noises or vibrations
2. Clean fi tting with a moist cloth if necessary.
7.2 Maintenance
WARNING
Risk of injury and poisoning due to hazardous or hot
media.
Use personal protective equipment when carrying out any
work on the
fi tting.
Safely collect the media and dispose of it in accordance
with environmental regulations.
If the separation diaphragm is defective, collect the trans-
mitter
fl uid with the admixture of medium, and dispose of it.
7.2.1 Removing fi tting
1. Ensure that:
– System is empty
– System has been fl ushed
– System is depressurized
– System has cooled down
– System is secured against being switched back on
again
2. Remove fi tting from the pipe.
3. Decontaminate fi tting if required.
– Dead space in the fi tting may still contain medium.
7.2.2 Changing the separation diaphragm
The fi tting must be removed from the pipeline
When changing the separation diaphragm, refer to the sec-
tional drawing
( → 9.5 Sectional drawing, Page 12).
ASV Stübbe recommends a contact adhesive (such as Pat-
tex Kraftkleber) to bond the bottom section to the upper
part.
1. Unscrew the pressure gauge (1) anti-clockwise from the
upper part (2).
2. Carefully drain the upper part (2). Collect the transmitter
fl uid (4) with the admixture of medium, and dispose of it.
3. Unscrew the upper part (2) anti-clockwise from the bottom
section (6).
4. Take the separation diaphragm (5) off the bottom sec-
tion (6) and dispose of it.
5. Insert a new separation diaphragm (4) into the bottom
section. When doing so, make sure that die side of the
diaphragm that is coated with PTFE and is slightly convex
faces towards the bottom section (4).
6. In the upper part (2), apply contact adhesive to the middle
turns of the internal thread. In so doing, apply the contact
adhesive as a ring of width approx. 2–3 mm.
7. Screw the upper part (2) to the bottom section (6).
( → 9.4 Tightening torques, Page 12).
8. Install fi tting ( → 5.3 Installing the fi tting, Page 7 ).
9. Installing fi tting in pipe ( → 5.4 Installing fi tting in pipe,
Page 8 ).
7.2.3 Replacement parts and return
1. Have the following information ready to hand when order-
ing spare parts ( → Type plate).
– Fitting type
– ID number
– Nominal pressure and diameter
– Body and seal material
2. Please complete and enclose the document of compliance
for returns ( → www.asv-stuebbe.com/service/downloads ).
3. Only use spare parts from ASV Stübbe.
10 MDM 902 BA-2017.09.21 EN 301 287