This document is an American Water Works Association (AWWA) standard. It is not a .. This foreword is for information only and is not a part of AWWA C AWWA C Disinfecting Water Mains. Current; Document Language: English; Published By: American Water Works Association (AWWA). AWWA C and these specifications. Disinfection requirements shall include preventive and corrective measures during construction, forms of chlorine and.
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Notification to the local Ministry office is not required for Category 2 watermain breaks unless: Follow the steps described in section 3. Appendix D The following flowchart is an example of the typical steps required for Category 2 watermain breaks. This section does not require that all of the information be recorded on a single form: The affected watermain s may not be put back in service before the corrective actions and sampling plan are completed unless a Water Advisory is declared.
The following steps must be performed for all emergency watermain repairs Category 1 and Category 2. The operating authority will attempt to maintain flow from the break, where possible, until an Air gap is established. Tags Environment and energyAwaw water.
Watermain disinfection procedure
Examples of watermain breaks that are typical aww Category 2 are included below for illustrative purposes only: Flow may be discontinued after an Air gap has been created.
Appendix E The following flowchart depicts the 6c51 for special case Contamination sewage or chemical as a result of a watermain break.
For relining of existing watermains, the conditions of section 1. Added, modified, replaced, extended; or Taken out of service for inspection, repair or other activities that may lead to Contamination, shall be disinfected before being put into service in accordance with the provisions of the AWWA C — Standard for Disinfecting Water Mains or an equivalent procedure.
If Contamination is evident or suspected, the procedures defined under section 3 for Category 2 watermain breaks shall apply. If there is evident or suspected sewage Contamination of a watermain, c6651 addition to the procedures in sections 3. Service pipes of mm diameter and greater shall be considered as watermains for the purposes of this procedure. Pipe and Repair Parts disinfected? Chain of custody Date and time of return to normal service Water Advisory declared: The following flowchart depicts the requirements for special case Contamination sewage or chemical as a result of a watermain break.
If, at any time, Contamination is evident or suspected, the break shall be reclassified as Category 2. Watermain breaks with no evident or suspected Contamination are classified as Category 1.
The information shall be retained as per the record keeping requirements of Section 27 of O. Spiral watermain break with evident Contamination. This procedure uses a risk management approach to categorize watermain breaks based on the potential for Contamination.
After business hours, the operating authority shall send an e-mail to the e-mail address specified by local Ministry office no later than 10 AM the next business day; or in the Special Cases described in sections 3. Upon restoration of secondary disinfection, the system can be returned to normal service, defined as having all valves returned to normal operating position.
AWWA C / AWWA C / AWWA C – Disinfection Of Water Package
For all other types of cleaning e. Flow may be reduced by throttling valves while maintaining sufficient flow from the break to minimize the potential for Contamination.
Refer to Appendices A and B for a flowchart and pictures to better understand 6c51 criteria to determine the categories of watermain breaks. This procedure also establishes minimum standards for record keeping, and notification to the Ministry and the local Medical Officer of Health.
Flushing watermain cleaning, the requirements of section 3. In developing these procedures, operating authorities may use best management practices that go beyond the minimum requirements in this document.
Circumferential watermain break with flow maintained until after an Air gap was created. Flushing shall continue until the disinfectant concentration at the point of Flushing reaches at least 0. With respect to new watermains, relined watermains and temporary watermains, the provisions of this document, including sections 1.
The reporting and corrective actions of Schedule 16 and the applicable Schedule 17 or 18 of O. The following flowchart is awaa example of the typical steps required for Category 1 watermain breaks Note: