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Low Air Flow Freezes Pumps!

This post is an addendum to the post titled Air-Supply Considerations For An Air Motor On A Molten Metal Pump. The primary reason for molten metal pump freezing is “slow starts.” A slow-start is defined as slowly increasing the motor RPM. When a transfer pump is slow-started, the hot metal flows gradually into a cooler riser. …


Pump Installation Planning Guidelines – Part 2 – Pump Startup Scheduling

Overview In Part 1 we discussed the pump installation planning from the highest level. We identified the typical stakeholders, and we briefly touched on each stakeholders concerns and goals. The project’s overall schedule is scalable and is highly dependent upon the size of the operation, the number of furnaces, and the role the furnaces play …


Air Supply Considerations for an Air Motor on a Molten Metal Pump

Our pumps are offered with air motor options. Air motor benefits include: No electrical connections and associated complexities. Pump speed is easily controlled by regulating the air pressure. The pump can be run from a nitrogen bottle during maintenance or emergencies. Air motors run cooler than ambient temperatures. Air motors are lighter weight than their …


3-Phase Motor Running Backwards? Updated 28-Jan-2016

Updated 28-Jan-2016 Editors Note: This post is one of the most frequently viewed on our website. This can be attributed to the high frequency of worn and damaged wiring. With proper electrical maintenance and pump startup procedures, this problem can be 100% eliminated.  3-Phase Motors used on Molten Metal Pumps Nearly all the electric motors …


Re-use of a Graphite Pump – Not a Warped Idea – Update 11-Jan-16

Updated 11 January 16 Unlike stainless steel pumps, graphite pumps can be quickly and easily reintroduced into the molten metal bath, and the pump will operate with the same efficiency as when removed from the melt. This capability is because graphite retains its structural and dimensional integrity while stainless steel becomes flexible and deforms at …



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 …


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. …


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 …


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. …



SLOW STARTS FREEZE RISERS! It’s worth saying more than once because a frozen riser is a big maintenance issue. In previous post we outlined the procedure for lower a molten metal pump into the bath. Once the pump is properly lowered into the molten metal; the pump must be turned on or energized. There are …

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