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Tube Furnace Maintenance Guide

Maintenance for your Deltech tube furnace


Rotary Tube Furnace Maintenance

Rotary Tube Furnace

We all know maintenance can prevent future problems. It can help minimize furnace downtime and ensure operator safety. Do you have a Deltech vertical tube, bottom loading vertical tube, or horizontal tube furnace? If so, you’ll be interested in knowing the recommended maintenance for these models. The timeline for recommended maintenance is based on use under Deltech firing guidelines and the assumption that the composition of the items being fired is not detrimental to the performance of the heating elements and refractory materials.

Every month

  1. Inspect the interior of your furnace for cracking, sagging, and/or pin failures. Replace pins as needed. Spares and instructions for replacement are available from Deltech. Contact Deltech if you notice any significant sagging or cracks that are turning into fissures.


  1. Replace the thermocouples. Thermocouples are subject to aging and will read low over time. This can lead to the actual furnace temperature being much higher than that indicated on the temperature controllers, leading to element and refractory damage and ultimate failure.
  2. If you are using Deltech water cooled tube end caps, replace the silicone and viton seals. This also applies to the air cooled load platform seal on Deltech bottom loading vertical tube furnaces.

Every 3-5 years

  1. It might be time to consider purchasing a complete reline kit from Deltech, fabricated to fit your furnace. Over time the insulation loses its thermal properties and it might be difficult to get the furnace to reach setpoint temperatures. Inspect the furnace for deterioration and review your setpoint vs actual data. Send us some pictures and firing data for analysis and recommendations if you are unsure.

As needed

  1. High temperature insulation tube plugs will deteriorate over time. Inspect and contact Deltech for replacements.
  2. Heating elements only need to be replaced when they fail. And they can be replaced independently; that is you can replace only the failed elements in a series rather than having to replace them all.  Review our element replacement tutorial videos for information on locating and replacing damaged molydisilicide heating elements. Spares are available from Deltech.
  3. And don’t forget to inspect and replace buss bars, element holders, and straps as needed. Pitted bars, frayed straps, and broken or damaged holders can result in arcing and loss of elements.

Contact us when you have questions or need parts or service for your Deltech tube furnace.

All Deltech furnace systems are designed and manufactured in the U.S.A, and shipped and installed worldwide.