Archive for February, 2010

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Spherical Turn on Bearing

February 25, 2010

Today at TRI, we successfully turned a large spherical surface (36″ diameter) on the saddle blocks of a journal bearing. We were able to hold a 0.001″ tolerance.

The key to this job is tool selection. The saddle blocks create an interrupted cut. Your tool needs to withstand the full final pass without breaking down.

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How TRI got into the fluid drive business

February 5, 2010

While documenting the IT system, I came across an article written in 1981. It explains how TRI improved the reliability of existing variable speed fluid drives.

Test, redesign, rebuild: Fluid-drive study concepts point way to upgrade equipment

Improvement of overall reliability demands scrutiny even of machinery that gives relatively little trouble. Learn how a program for large variable-speed boiler-feed-pump drives improved an already dependable element; even more important, how you can extend to your components the principles involved

By Dr. Melbourne F Giberson, P.E., Turbo Research Inc

The road to operating reliability in the central station is a difficult one, littered with breakdowns of equipment that went part of the way before a disappointing premature outage. The steam generator, the feed pump, the main turbine are a few of the major elements that have required searching and costly attention. Improvement in reliability is already clear for several categories of large machines, indicating that the goals are attainable.

For some of the humbler components, however, there has been scarcely a start toward constructive and cooperative work to widen the intervals between unforeseen outages. This work will have to be done if unit and station reliability and availability are to draw maximum benefit from the efforts on major elements. Perhaps new studies being planned can derive help from a series of programs covering shaft-driven fluid drives for boiler feed pumps.

These programs, for work done over a six-year period, resulted in modification recommendations to upgrade equipment that had by and large been satisfactory but was thought to be capable of some improvement. Keep; in mind that program details for other equipment will change. It is the program philosophy and the open cooperation among manufacturer, utility, and consultant that should be part of any new study of reliability enhancement.

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Variable Speed Fluid Drives for Pumps

February 4, 2010

The contents of this post were originally published in the Variable Speed Drive chapter of the International Pump Handbook

In almost all pumping applications, some means is required to provide variable flow and/or variable pressure of a liquid as it leaves a pump and enters a process application.  Two alternative approaches exist, either (a) a Variable Speed Drive for a pump, or (b) a Constant Speed Drive for a pump with a discharge control valve that can provide a variable discharge flow to the process application.

The primary emphasis of this post is to focus on Variable Speed Fluid Drives for pumps such as boiler feed pumps, condensate pumps, and pumps for other fluids and applications.  Nevertheless, for completeness, other types of Variable Speed Drives for load equipment are briefly discussed.

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Larger Capacity

February 4, 2010

TRI Transmission & Bearing Corp. has completed the design and installation of a new centrifugal Babbitt caster. This new addition will allow TRI to produce larger bearings.

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Variable Speed Fluid Drives

February 4, 2010

One of the primary products that TRI Transmission and Bearing Corp. produces is a variable speed fluid drive for the power industry. Our entry into the market started back in the 1970’s when power companies started modifying their operations. TRI was brought in as consultants to address vibration problems. The short story is that we redesigned the fluid drive and the success of the new design spawned a whole new aspect of our business.