In this PDF, You can know what is the major causes of the Rotary Joints and Rotary Union problems

1. Globe Star Engineers (India) Pvt. Ltd.
PRESENTS
“Troubleshooting Major Causes of Rotary Joint
and Rotary Union Problems”

2. • As mechanical devices with wear components, rotary joints are suspect to
premature wear when not correctly installed. Below are the leading major
happens of premature wear and how to limit the potential for early
replacement of components due to improper installation.
• Improper Piping
Improper piping that leads to piping strains. Piping strains lead to excessive
force exertion on the body of the rotary joint or excessive guide wear with
self-supported rotary joints. For rod-supported rotary joints, the support
rods deflect under the excessive piping strain and that causes poor seal
alignment.
Prevent piping strains by using proper flexible metal hoses, piping support,
expansion joints or loops, and accurate rotary joint or rotary union
installation.
• Rotary Joint or Union Misalignment
Rotary joint or rotary union misalignment occurs when the centerline of the
rotary joint components are not accurately aligned with the centerline of
the journal. Misalignment can cause interference with the rotary joint’s
internal parts and significantly increases the wear rate of the sealing
components. Symptoms of rotary joint and rotary union misalignment
include:
• Broken spring
• Excessive key and key-way wear
• Broken horizontal siphon pipes

3. • Broken journal flange bolts
• Broken nipple flange studs
• Flexible metal hose failures
• Broken carbon guides
Prevent misalignment by accurately installing the rotary joint and
supporting equipment. Evenly torque journal flange and nipple flange
fasteners. Bent support rods or poorly aligned mounting brackets are
common causes for misalignment as well.
• Lack of/Improper Torque Restraint
Lack of a torque restraint or an improper torque restraint increases the
radial forces that are applied to self-supporting rotary joints. Using flexible
hoses as a torque restraint causes high radial loads to be applied to the
rotary joint. An overly restrictive torque restraint can cause excessively
high forces as well. A properly designed torque restraint allows the rotary
joint or rotary union to move axially and radially while preventing rotation.
• For more information :
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