Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

Surprise Change In The Distance Between Shaft Ends

Coupling Corp Surprise BSE Change

Surprise Change In The Distance Between Shaft Ends

Thermal Growth – No Problem

Recently a power plant was installing a new coupling after an extended outage. A new pump shaft and element were installed during the outage, and significant work was performed on the turbine. The original distance between shaft ends (DBSE or BSE) was 14.0 inches, and the FLEXXOR Coupling spacer was designed for this dimension. However, the correct amount of thermal growth and equipment thrust was unknown at that time.

Thermal Growth Determination

Before the installation could continue, a discussion about thermal growth and thrust position ensued. The team realized that the net result of the shaft movement would amount to a different BSE than was expected. The difference in shaft position was about 0.100 inches. Since the allowable axial movement of the coupling was +/- 0.090 inches, it was crucial to set the hubs and shafts properly so that the running BSE would not be in a position to overly stretch or compress the coupling.

Coupling Corp Surprise BSE Change (1)Correcting the Axial Position of the Coupling Hub

Once the correct shaft spacing was determined, the hubs needed repositioning. Since the pump side hub was already fixed in its position by the shaft taper, the adjustment needed to happen on the turbine side where the shaft was straight. Luckily CouplingCorp had designed the hubs to have some adjustability in the axial position of up to 0.250 inches. So, within minutes, the Anderson Clamp Hub was loosened, repositioned, and re-tightened in the new position.

Thanks to the ease of use of the Anderson Clamp Hub, the mechanics overcame a last-minute hurdle with no sweat. No heat or hydraulics were needed, and one mechanic could make the adjustment very quickly.

Related Articles

Coupling Corp Circulating Water Pump Success (1)

Circulating Water Pump Success

Large Vertical Pumps with Large Problems A power plant had problems with its circulating water pump system. The system was rated…

Related Whitepapers

CFturbo BLADERUNNER Centrifugal End-Suction Pump Casestudy

The CFturbo BLADERUNNER 2024 is a unique and innovative tool that will outperform the known capabilities of an automated simulation process for Turbomachinery performance maps.…

Defeat The Enemies That Interrupt Your Water/Wastewater Operation

Download ABB’s new playbook to help you identify and defeat the enemies that interrupt your water/wastewater operation and learn how you can… • Reduce operational…

Sodium Hypochlorite Service Success with NETZSCH PERIPRO®

Sodium hypochlorite (NaOCl) is widely used by municipal water treatment plants Sodium hypochlorite (NaOCl) is an effective water disinfectant to treat the raw, filtered water…

Tips for the Installation of MCRT® Torquemeters

An MCRT® torquemeter must be installed properly as an integral part of a drive line network in order to achieve satisfactory operation. Proper installation will:…


Leave a Reply

Your email address will not be published. Required fields are marked *