Operating Instructions Maier Rotary Joints
Series DP
B-DP_en -Version 4 – 14.02.2011
Keep these instructions for future reference!
4
3 Information on design and mounting
Attention!
Damage to components due to vibration and heat expansion.
Use only flexible hoses to connect the rotary joint!
Use flexible metal hoses for the connection between the supply pipe system and the rotary joint hous-
ing. This compensates for heat expansion and vibrations.
Never apply torsional, tensile or pressure forces to metal hoses. Observe the minimum bending radii
quoted by the hose manufacturers. Never use axial compensators.
Use flat packings made of pure graphite to securely seal flange connections.
Only operate rotary joints sizes DN 65 … 100 with a sufficiently dimensioned torque support. The sup-
port element must allow for axial and radial movements of the housing. For sizes DN 06 … 50, due to
low friction torque support by the hoses is sufficient.
For DN 65 and greater install an additional safety unit:
Install a
torque monitoring
system or a bearing monitoring system with vibration pickup (e.g. FAG or
SKF) with connection to the emergency shutdown system in order to avoid bearing damages and con-
sequential damages.
If the monitoring system is activated, the rotation of the roller should be stopped immediately and the
supply of the medium should be interrupted upstream of the metal hoses.
Center the inner pipe and the roller as well as the rotary joint. Run-out and axial tension will lead to mal-
functions of the rotary joint.
For smooth operation of rotary joint ensure concentricity and minimum run-out tolerance at roller or in-
termediate flange.
In the case of a rotary joint with rotating inner pipe it is recommended to use a stainless steel inner pipe
or at least a hard chromium-plated bearing seat.
Operation at water temperatures exceeding 70°C (158°F):
In order to ensure maximum reliability and service life of the seals in the rotary joint, the hot water used
in the rotary joint must be processed, treated and conditioned according to the DdTÜV Guidelines Tech-
nical Chemistry 1466 (VdTÜV - Merkblatt Technische Chemie 1466). The circulated water must have a
low salt concentration and a maximum conductivity of < 100
S/cm (100µmho/cm)!
If the salt concentration is high, this may result in deposits in the seal gap and premature failure of the
seal!
4 Transportation and storage
The rotary joints may only be stored in the original package.
Make sure the storage conditions specified in the "Specifications and Spare Parts" are met.
If the rotary joint itself or the facility in which the rotary joint is installed is to be preserved, make sure the
preservation agent and the seals of the rotary joint are compatible.
