Glass Furnace Autumn Shutdown Approaches: Molybdenum Electrode Spare-Part Production Checklist

The autumn maintenance of a glass furnace is usually scheduled when the order rhythm is relatively stable, so the window left for spare-part purchasing is not long. Molybdenum electrodes are custom parts: the later the specification, end structure and inspection requirements are confirmed, the more the lead time is compressed. Scheduling the maintenance plan backward into a spare-part checklist is the first step to avoid waiting for material with the furnace already down.

First, take stock of on-hand and in-transit items

Set up an electrode ledger by furnace number, recording grade, diameter, length, thread or end form, date of last replacement and remaining stock. On site, electrodes of the same specification are often mixed together and old electrodes are not separated from new ones; during the count, check the packaging labels and material certificates at the same time to avoid picking the wrong item during maintenance.

Then re-verify drawings and installation dimensions

After one operating campaign, electrode holes, water jackets and seals may have shifted due to thermal deformation or maintenance work. Before shutdown, re-measure the installation space and clamping dimensions, and confirm whether the length allowance on the drawing still applies. If adjustment is needed, complete drawing sign-off before ordering to avoid secondary machining after delivery.

Scheduling lead times backward from the shutdown window

Lead times differ between standard and custom electrodes, and inspection items also affect the shipping schedule. List the timing of furnace teardown, cleaning, installation, heating and feeding, then allow a buffer for transport and incoming inspection. For furnaces that replace electrodes in batches, place orders in groups by urgency to reduce one-off inventory pressure.

Safety stock and handling tools

The safety level depends on the replacement cycle and the supplier's response speed, so it should not simply be double the historical usage. Furnaces in continuous production should hold at least one maintenance cycle's consumption, stored separately to avoid impact damage. Handling tools, lifting gear, protective equipment and spare seals also belong on the checklist, so that electrodes do not arrive only to be delayed by missing tools.

After maintenance, record the actual replacement quantity, failure modes and remaining stock in the ledger to support the next spare-part plan.