HomeMy WebLinkAbout2024-08-22-processed-water-systemProcessed Water System for Chemistry and Biology Laboratories
These design guidelines provide the requirements for ensuring the supply and quality of ASTM Type 2 water in laboratory settings, with specifications for production, distribution, and quality assurance.
1. Overview
Chemistry and Biology laboratories will be supplied with ASTM Type 2 water. This water will be produced in a centralized system within each building and distributed via a network of non-barbed spigots throughout the labs by TCCD Education Specifications.
2. Water Production and Distribution
• Water Type: ASTM Type 2 water
• Production System: Centralized, single production system per building
• Distribution Method: Line water pressure will transport Type 2 water from the production system to individual fixtures.
3. Piping Requirements
• Material:
o Schedule 80 PVC (ASTM D-1785, Type 1, Grade 1) with solvent-welded fittings (ASTM D-2467) or
o Schedule 80 natural polypropylene (ASTM D-2146)
• Purpose: To ensure durability and compatibility with high-purity water.
4. Water Quality Management
• Recirculation: The system will recirculate high-purity water to maintain quality.
• Process Flow:
o Pre-Filtration: To remove particulate and prepare RO water feedstock for the Type 2 production system.
o RO Stage: First purification stage to lengthen life of DI stage.
o DI Stage: Second purification stage; use two cation-anion mixed bed resin tanks in series.
o Post-Filtration: To ensure the final water quality if DI stage media leaks into process flow.
• Purity Monitoring: Multi-stage visual indicators will be installed at the DI stage to monitor water purity .
5. Backflow Prevention
• Device: The system will be connected to the lab's non-potable water system through an approved, serviceable, testable backflow prevention device.
6. Additional Purity Requirements
• Evaluation: Any need for water purity beyond Type 2 will be assessed for necessity and the most cost-effective provision methods.