Exhibit A - HVAC Water System.pdf
PDF 162 KB Posted
- Attached to
- Water Treatment of HVAC and Domestic/Potable Water System, U. S. Embassy London, United Kingdom
- Solicitation number
- 19GE5025Q0114
About this file
This document is a Statement of Work (SOW) for HVAC Water Treatment Systems at the U.S. Embassy in London, located at 33 Nine Elms Lane. The SOW details preventive maintenance requirements for HVAC water treatment systems at three embassy properties: Winfield House (chilled water and heating hot water systems), Wychwood House (heating hot water system), and Albany Court (heating hot water system). The contractor must perform quarterly and annual maintenance tasks, including system inspections, water analysis, bacteriological sampling, chemical dosing, and comprehensive system checks.
The maintenance requirements include quarterly activities such as system inspections, water analysis, bacteriological testing, and chemical dosing, as well as annual chemical supply of 200 liters of corrosion inhibitor and 50 liters of biocide. The contractor must conduct detailed process instrumentation engineer checks, calibrate sensors, test chemical parameters, and ensure all activities comply with EPA regulations and occupational safety requirements. Specific maintenance parameters include maintaining low corrosion rates on mild steel and copper alloys, preventing scaling and microbiological fouling, and maintaining total aerobic counts below 10,000/ml in both open and closed systems.
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Other files
| File | Type | Posted |
|---|---|---|
| QA Letter_25Q0114.pdf | ||
| 19GE5025Q0114-0001-signed.pdf | ||
| RFP_Cover letter_19GE5025Q0114-signed.pdf | ||
| Exhibit B - Domestic Potable Water System.pdf | ||
| Exhibit C - Winfield House External Buildings.pdf | ||
| Attachment 2 - Past Performance.docx | DOCX document | |
| RFP_19GE5025Q0114.pdf | ||
| Attachment 3 - W-14.pdf | ||
| Attachment 1 - Pricing.xlsx | XLSX spreadsheet |
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Text version
US Embassy-London UNCLASSIFIED U.S. Department of State
EXHIBIT A
Statement of Work
HVAC Water Treatment Systems
I. GENERAL INFORMATION:
The United States Embassy in 33 Nine Elms Lane, London, SW11 7US requires professional services and contractor cost proposals to perform preventive maintenance services of the facility’s HVAC Water Treatment Systems.
II. PROJECT REQUIREMENTS:
HVAC System Description:
Winfield House: Chilled Water system and Heating Hot Water system.
Wychwood House: Heating Hot Water system Albany Court: Heating Hot Water system
III. DESCRIPTION OF EQUIPMENT:
The Water Treatment Contractor shall survey the site to record all the required information of the systems.
IV. GENERAL REQUIREMENTS:
The Contractor SOW shall provide all labor, tools, and materials required to carry out all preventive maintenance as outlined in this SOW. US Embassy staff may have service manuals for equipment included in this SOW. If they do not, the Contractor shall assist Embassy Staff in obtaining the manuals.
The water Treatment contractor shall survey the sites and note all the required information to perform the water treatment.
The water Treatment contractor shall calculate the volume of each loop if required to determine the chemical dosage levels.
The water Treatment contractor shall perform any other calculation required to achieve the water treatment goals.
The water Treatment contractor shall supply all the chemicals required to perform the preventive maintenance, and to keep the water parameters within the specified operating levels.
V. SCOPE OF WORK - PREVENTIVE MAINTENANCE
Contractor shall provide all materials, supervision, labor, tools and equipment to perform preventive maintenance. All personnel working in the vicinity shall wear and /or use safety protection while all work is performed. Any questions or injuries shall be brought to the attention of the Post Occupation Safety and Health Officer (POSHO). Material Safety Data Sheets (MSDS) shall be provided by the Contractor for all HAZMAT materials. Copies will be provided to the COR for approval.
At a minimum, the following work shall be accomplished:
HVAC Water Treatment Preventive Maintenance (PM)
i. Quarterly (4 time per year):
1. Inspect system and complete water analysis.
2. Sampling/analysis Bacteriological (TVC, SRB's & Pseudomonas). Laboratory testing of the samples.
3. Dosing the system with the required chemicals.
4. Check the system performance and report any issue to the COR.
ii. Annual:
1. Supply the following chemicals:
• Corrosion Inhibitor (200 liters).
• Biocide (50 liters).
iii. Maintenance Procedures:
1. Sample water from the closed loop system per manufacturer’s recommendations.
2. Test for the proper levels of chemicals in the closed loop system and adjust chemical feeds as necessary to maintain optimal conditions in the system.
3. Record test results in a logbook.
4. Use the conductivity meter to test for total solids and plot in a logbook. Record and analyze abnormal changes.
5. Check the total conductivity of the system with a conductivity meter. Record results in a logbook.
6. Check pressure gauges for proper operation.
7. Check pH with the pH test strips and/or pH meter.
8. Check cleanliness.
9. Check control system.
10. Check system functioning.
11. Record all test results in the component maintenance log.
12. Clean sample bottles and wipe down all chemical treatment equipment.
13. Change corrosion coupons if applicable. Send used coupons to the laboratory for analysis. Contractor to supply written coupon corrosion test report to the Facilities Manager within fourteen (14) calendar days after analysis.
iv. Process Instrumentation Engineer Checks and Adjustments
1. Visual inspection for the controller, sensor, pumps, tubing and other accessories
2. Testing of the chemical parameters
a. pH
b. Total dissolved solids
c. Conductivity
d. Aerobic Plate Count
e. Corrosion Inhibitor Level
f. Biocide dosage of both the Biocides
g. Test supply water for base conditions (iron, manganese, alkalinity, total hardness, chloride)
3. Calibration of the sensor with known standard
4. Process calibration of conductivity by a calibrated instrument with a known standard
5. Make sure that the controller is functioning properly.
6. Make sure that the solenoid valves, contact water meter, inhibitor pump and biocide pumps are physically functioning properly as per the settings in the controller.
7. Make sure that the chemical is dosed only as per the specification
8. Submit service report with detailed description of errors and causes(if any) and corrective action taken.
v. Safety & Special Instructions:
1. Chemicals must comply with the Environmental Protection Agency (EPA) regulations and handled in accordance with occupational safety requirements. Employ personal protection against corrosive or hazardous treatment chemicals as appropriate.
2. Be familiar with the Material Safety Data Sheets of any chemicals used in the water treatment program.
3. Water treatment specialists must be properly trained and certified.
4. Water treatment must be based on proven standard engineering practices.
5. Follow treatment as directed by manufacturer and in accordance with requirements specified under Section 10.
6. Maintenance includes chemicals, chemical feeding, maintaining proper water conditions, controlling bleed off, protecting idle equipment, and record keeping.
7. Ensure chemicals are properly stored; test equipment clean, and that chemicals have not passed expiration date.
8. Maintain records and test results.
9. All tests shall conform to the manufacturer test procedures and standard values.
The water treatment Contractor shall determine the dosage levels of chemicals and stay within the specified operating parameters:
Parameters Maintenance Levels Open System Closed System Corrosion on mild steel Less than 2.0 mpy Less than 1.0 mpy Pitting attack on mild steel None None Corrosion on copper alloys Less than 0.2 mpy Less than 0.1 mpy Scaling and deposition None None Microbiological fouling 1. No visible deposits
2. No health hazards
3. Total aerobic count less than 10,000/ml
1. No visible deposits
2. No health hazards
3. Total aerobic count less than 10,000/ml
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