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Tag graphite

9
Feb

Graphite – Non-Wetting in Molten Zinc

Graphite is a fantastic refractory material. Graphite’s characteristics include a very low thermal coefficient of expansion, high-temperature tolerance, light weight, and relatively low cost. There are other materials that can be used to build zinc pumps such as MoW or Moly-Tungsten, but the MoW is very expensive and hard to work resulting a pump that is …

7
Feb

NEVER RUN A PUMP DRY!

The molten metal IS the lubrication for the impeller and base-volute. Running the pump dry will result in damage. The only question is how much damage. This impeller is an example of a very costly mistake. A broken impeller is probably the best possible outcome of running a pump dry. Most likely, the damage would …

5
Feb

Pre-Storage Pump Inspection – Maintenance Pumps

Factory Evaluation Any or all components can be sent to High Temperature Systems, Inc. for inspection and evaluation. The most accurate evaluation requires complete chemical removal of the metal from the graphite surfaces. This is especially true for proper inspection of the pump base. Contact High Temperature Systems, Inc. prior to shipment of any components. …

4
Feb

Preparing the Pump for Storage – Operational Assessment and Removal from Metal

Operational Assessment – Before Removing the Pump from the Metal About 10% of pumps are used exclusively for scheduled furnace maintenance. Between usages, these pumps need to be properly stored and maintained. The first step to good pump maintenance is an operational assessment. Study the pump’s operation prior to de-energizing and removal from the molten …

3
Feb

Maintenance Pumps and Typical Use Cases

About 10% of molten metal pumps are used exclusively for maintenance applications. It is not uncommon to use a maintenance pump once every year to eighteen months. Long term storage of a pump, especially a pump that has been exposed to molten metal, requires special considerations. Maintenance pumps tend to undergo rougher duty than continuous circulation and transfer pumps. …

23
Dec

Pump Installation – Lowering the Pump into the Molten Metal

The following is standard procedure for introducing a pump into a molten metal bath: WARNING – GRAPHITE CONTAINING MOISTURE MAY EXPLODE IN MOLTEN METAL!  ALWAYS REFER TO THE MANUAL THAT SHIPPED WITH YOUR MOLTEN METAL PUMP FOR ADDITIONAL SAFETY INFORMATION. IF YOU SEE THE PUMP “BUBBLING” AT ANY POINT IN THE FOLLOW PROCEDURE, LIFT THE …

20
Dec

Graphite Properties and Application in Molten Metal Pumps

Graphite is the refractory material of choice for many non-ferrous molten metal pump applications. Below is a list of graphite characteristics that are important in pump applications: Dimensional Integrity – Graphite maintains mechanical dimensional integrity across a wide range of temperatures. Unlike steel alloys that bend and twist, graphite remains dimensionally stable and displays relatively …