Christian Maier GmbH & Co. KG
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Operating manual Series DP_en – Part-B-Version 10 – 19.03.2020
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B
8
Operation
NOTICE
1.
The rotary joints must never run dry as this may cause damage to the rotary joint, and
the maximum permissible surface temperature may be exceeded.
As a general rule, dry-run of the rotary joint is not permissible. Exception: Test run for
max. 30 minutes at maximum 10% of the admissible max. operating speed, or if operat-
ing speeds are very low, 10 1/min should not be exceeded.
A possible suitability of special rotary joints for dry run is specifically indicated in the op-
erating instructions and the declaration of conformity.
2.
Sudden temperature and pressure loads will cause damage to the rotary joint.
Maximum temperature change during start-up ΔT ≤ 2 K/min.
3.
Exceeding the permissible application data as determined in chapter "Specifications and
Spare Parts" will cause damage to the rotary joint. Avoid a combination of maximum
values.
8.1
Commissioning
During initial commissioning, minor dripping leakage of the medium may occur during
the breaking in period of the dynamic seal. The duration of the breaking in period de-
pends on operating speed and pressure; usually, it is terminated after a few days.
To avoid premature damage to seals in the rotary joint, it is recommended to frequently
check the filters installed for the medium when a new system is put into operation for
the first time. During this period, expect more soiling by particles such as chips, rust or
scales in the piping system. This is particularly true if the system has not been flushed
prior to commissioning.
8.2
During Operation
Check the following:
Concentricity of the rotor with the roller driver
The radial deflection in the rear area of the housing must not exceed the values listed in
the section "Permissible concentricity tolerance
Quality of the medium in the system
Record the data checked. Refer to the section "Specifications and Spare Parts" for the
default values.
Visible leakage at the pressure relief connection
The operating behavior of the mechanical seal does not change suddenly. Usually, an
impending failure of the seal is indicated by slowly increasing leakage. This allows you to
collect empirical data about the operating behavior of the rotary joint running on the
system.