Inspecting a Double Drum Dryer

Inspecting Used Drum Dryers



The following information is suggested as a guideline for inspecting used double drum dryers

One Set (2) Dryer Drums

a. The drum must pass a hydrostatic pressure test of 1.5 times the rated pressure for 1 hour.
b. Drums must have a wall thickness which will permit the reconditioning of the drum surfaces and pass a Hartford Boiler re-certification pressure rating test. The drum diameters must not be less than a 1/2 inch under the original drum diameters.
c. The faces of the drums must not be damaged or have indentations more than .015 inches deep.
d. The shoulders of the drum faces must not be damaged or worn in excess of 1/32 of an inch.
e. The bearing shafts must not be damaged. For shafts with roller bearings, the shafts must measure to a tolerance of + .000 – .006 inches of the bearing diameter. For shafts with sleeve bearings, the shafts should measure no more than .012 inches below the bearing diameter.
f. Threaded holes in the shafts and drums for mounting covers, steam joints, caps, etc., should not be stripped or worn.
g. Key-ways in the shafts for drive gears or sprockets should not be worn.
h. Documents on the registration of the drums, as well as National Board of Boilers and Pressure Vessel Inspectors numbers should be available.

Read more in our Drum Drying Resources Technical Bulletin – DDR02 click here. Visit our Technical Bulletins Page to see all of our Technical Bulletins.


Saving an old Drum Dryer

Just take a  look at these before and after pictures of the refurbishing process for drum drying equipment. the pictures speak for themselves! Contact us and see how we can save you a lot of money if you purchase one of our rebuilt systems. We would also like to give you an estimate on rebuilding or retrofitting existing  drum dryer(s) or  other processing equipment you might have at your facility. Let us help you by providing your equipment a little TLC. Click on the image for larger view or visit our Retrofitting Page click here.

Rebuilding a drum dryer before and after
Before and After Refurbishing Process - Single Drum Dryer