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A difficult vertical turbine pump install is negated with Hayward Tyler’s engineering and design expertise
A nuclear power plant was having a difficult time re-installing their vertical turbine pumps after recent maintenance. The original seismic design, which had been in place for more than 30 years, was increasingly difficult to line up and install. The original support had very limited adjustability once the pump was installed and the fasteners were located under the support’s top beam, making them difficult to reach and assemble. The site contacted Hayward Tyler to redesign the seismic supports in order to alleviate the installation issues, while still complying with all the necessary nuclear requirements.
Hayward Tyler held technical meetings with site staff to evaluate the current design and better understand the difficulties the maintenance personnel was having. This included discussing the current method for fixing and troubleshooting ways to make it more ergonomic. With this knowledge, a new design was created that allowed for much easier installation. The new design
incorporates multi-directional adjustments that allow much greater flexibility on alignment. Additionally, the method for securing the support to the pump was moved to a more ergonomic position, allowing the maintenance personnel to access the bolts from a standing position.
Hayward Tyler engineers evaluated the design against the original specification and ASME nuclear codes to ensure the new design allowed the pump to perform during normal, upset, emergency, and faulted conditions. This included analyzing the stress and deflections during these events. The design passed and the necessary design report was produced and stamped by an in-house
Professional Engineer.
These supports were manufactured by Hayward Tyler and supplied to the site where they were successfully installed, resulting in a time savings of approximately 10 hours per pump change over.
Project Summary
SITE/LOCATION:
- Nuclear Plant
SCOPE OF WORK:
- Site survey and local investigation
- Evaluate existing installation configuration
- Review pump installation method
- Redesign seismic support
- Provide new seismic stress report
- Ensure design meets:
- Original customer spec.
- ASME B&PV SIII, Cl3 1977 w/winter addenda 1977 and 1978
- All fault conditions
- Professional Engineer (PE) stamp design
- Manufacture new supports
BASIC PUMP DESIGN DETAILS:
- Design Code: ASME B&PV SIII, Cl3 1977 w/winter addenda 1977 and 1978
- Model: 6×8 VSN3
- Application: Essential Screen Wash Pump
- Rated Head: 290ft
- Rated Flow: 450USgpm
- Pump RPM: 3560
- Liquid: Seawater
Project Data Sheet
| Application | Emergency Screen Wash Pump |
| Quantity | 4 |
Codes and Standards
| Design | ASME B&PV SIII, Cl3, 1977 w/winter addenda 1977 and 1978 |
Pump Details
| Pump Type | Vertical Turbine |
| Pump Size and Model | 6×8 VSN |
| Fluid Pumped | Demineralized Water |
| Rated Flow | 450USgpm |
| Rated Head | 290ft |
| Operating Temperature | 83°F |
| Specific Gravity | 1.025 |
Analysis
| Analysis Type | Seismic-Static/Dynamic |
| Stress Calculations | ASME B&PV Section III and VIII, Stamped, Safety Related |
| Programs | ANSYS, Solidworks |
