The Kadant Blog

Fluid Handling


Using Rotary Unions With Thermal Oil

Rotary unions used with heat transfer oils require special attention during repair to ensure leak-free operation. Heat transfer oils tend to “coke” at high temperatures and deposit material that can settle in the rotary union and adhere to the sealing components.

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The Causes of Flooding in Paper Dryers

The majority of flooding incidents can be attributed to steam and condensate system issues (poor equipment sizing, incorrect system set-points and incorrect system calibration) and mechanical issues (unreliable or incorrectly installed steam joints and syphons).  In this discussion, we will focus on the steam system issues that contribute to flooding.

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Why Dryers Flood in Papermaking

At some stage during their working career, papermakers and mill engineers will have encountered at least one instance of flooded dryers in the drying section on their paper machine.

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What are Rotary Joints & Rotary Unions?

A rotary joint, also referred to as a rotary union or rotating union, is a rotary sealing device that connects rotating equipment to fixed piping for the transfer of steam, water, thermal oil, coolant, hydraulic oil, air, and other media.

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How to Recover From Flooding in Paper Dryers

When flooded dryers are identified during machine production, and if these issues are steam system related issues, there are several actions that can be taken to restore condensate flow and get the paper dryer back to normal operation.

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Identifying Flooded Dryers in Papermaking

Flooded paper dryers exhibit a number of tell-tale signs which can be used to identify that the dryer is flooded. The following troubleshooting techniques can be used

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How Does Condensate Behave In Corrugator Rolls?

Condensed steam (“condensate”) that forms inside a heated corrugator roll may be laying on the bottom of the roll (“puddling”), tumbling around inside the roll (“cascading”), or spinning with the shell (“rimming”).

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Direct Steam Injection Heating

Conventional storage tanks with sparge pipes (simple pipes with drilled steam distribution holes) tend to have uneven water temperature control, steam hammer, heavy vibration caused by collapsing steam bubbles, and low low energy efficiency as steam bubbles escape to atmosphere due to incomplete condensation.

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