Equipment Knowledge

Equipment Knowledge

Electrical Corona & Testing

What is electrical corona? Corona is the ionization of the nitrogen in the air, caused by an intense electrical field. Electrical corona can be distinguished from arcing in that corona starts and stops at essentially the same voltage and is invisible during the day and requires darkness to see at night. Arcing starts at a voltage and stops at a voltage about 50% lower and is visible to the naked eye day or night if the gap is large enough (about 5/8″ at 3500 volts).

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Equipment Knowledge

Dynamic Movement White Paper

Regardless of the approach taken to measure true dynamic movement, coupled machines need to be set to cold alignment targets that will reflect the actual changes in the shaft alignment. This will lead to lower vibration levels, increased Mean Time Between Failures, decreased maintenance expenditures and increases in production. Much like the philosophical change from aligning shafts with dial indicators to aligning shafts with laser based systems, these types of measurements will take some time to be generally accepted and routinely practiced.

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unbalance caused by asymmetry
Equipment Knowledge

How Unbalance Affects Bearing Life

Mass unbalance in a rotating system often produces excessive synchronous forces that reduce the life span of various mechanical elements. Unbalance is basically very simple case caused by an asymmetry in the rotating element that results in an offset between the shaft centerline and center of mass. Asymmetry can be an off-center weight distribution, or it can be a thermal mechanism that produces uneven heating and bowing of the rotor, or it can be an electrical effect that produces uneven magnetic field.

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Equipment Knowledge

Should Jack Screws be tight or backed off?

There has always been a debate on whether jack screws should remain tight against the side of the machine case after the machine has been moved into position or to back off the screws, so they do not touch. Should jack screws be tight or backed off? The answer is yes and no. In some situations you should leave the bolts tight against the machine and in other situations, it may be better to back off the jack screws.

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Equipment Knowledge

6 Easy Steps to Maintain Your Hydraulic Equipment

“What’s the system’s normal operating temperature? What’s the system’s usual operating pressure range?” If you can’t answer these two basic questions about the vital signs of your hydraulic equipment I strongly recommend you make the effort to get to know your hydraulic equipment better. The information is easy to collect and can give valuable insight to the health of your hydraulic equipment.

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Equipment Knowledge

Tips For Blower Maintenance

The article is intended to provide a few tips for blower maintenance to plant maintenance professionals in reducing the downtime and increasing the reliability of blowers. Generally the apparent reasons for blower failure are: Failure of Bearings and High Vibrations

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Engineering

Understanding Shaft Alignment: Thermal Growth

Machine conditions change from the time the machine is off line to when it is running under normal operating conditions. Some of these changes are due to process forces (e.g., fluid pressures, airflow, etc.). The most notable of these changes is the change in the temperature of the machine bearings and supports. This is called the machine’s thermal growth.

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