5. 2022_Short Circuit Study-Results for 200A disconnects.pdf
PDF 77 KB Posted
- Attached to
- Building 154, Air Compressor Replacement, Ames, IA Federal contract opportunity
- Solicitation number
- 12505B22R0025
About this file
This document includes a federal solicitation for building services and a related technical report. The United States Department of Agriculture Agricultural Research Service is seeking proposals to replace two air compressors at a building in Ames, Iowa under solicitation number 12505B22R0025. The requirement is set aside exclusively for small businesses with a size standard of $16.5 million. The construction value is estimated between $500,000 and $1,000,000. The period of performance is 365 calendar days from notice to proceed. A pre-bid site visit was held in August 2022. Proposals are due by August 2022. The technical report details failures of two switches and associated buses during a short circuit study, requiring attention.
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| Sign in sheet for 154 air compressor project_9_13_2022.pdf | ||
| 12505B22R0025 - Amendment 0001.pdf | ||
| 12505B22R0025_Questions and Answers.pdf | ||
| 12505B22R0025 - Amendment 02.pdf | ||
| Sign in sheet Site visit_22R0025.pdf | ||
| 10. Drawings - Building 154 Air Compressor Replacement Project_FINAL_2022.pdf | ||
| 8. ARS-371.pdf | ||
| 3. Specifications-Bldg 154, Air Compressor Replacement.pdf | ||
| 1. 12505B22R0025 - Bldg 154, Air Compressor Replacement.pdf | ||
| 2. Statement of Work-Bldg 154, Air Compressor Replacement_7.22.22.pdf | ||
| 6. Wage Determination_IA20220074.pdf | ||
| 9. ARS-372.pdf | ||
| 4. Building Automation Systems_2022_ONEAC-Bldg 154, Air Compressor Replacement.pdf | ||
| 7. Past Performance Questionnaire.pdf |
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Text version
2.2 SHORT-CIRCUIT FAILURE RESULTS
There were some equipment failures that surfaced during the study from the two scenarios that will require attention. The use of the utility source and generator contributions produced high short-circuit current values with motor contributions vs the rating of the equipment bus and breaker short circuit current ratings. See the following tables indicating areas of concern.
2.3 TABLE 1 - NORTH CAMPUS SCENARIO 1
As Found Normal Operating Condition Equipment Failures
Device/Bus Status Description Voltage (V) INT kA X/R
Manufacturer Bus/Device/ Rating% Calc/Dev/Series Rating%
AIR-COMP-1-DIS SWITCH Failed DH Heavy Duty 480 *14.09 1.61
BUS-0120
30-1200A 600 10.00
CUTLER-HAMMER
DH 80.00 *140.90
AIR-COMP-2-DIS SWITCH Failed DH Heavy Duty 480 *14.58 1.65
BUS-0121
30-1200A 600 10.00
CUTLER-HAMMER
DH 80.00 *145.80
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