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Award Bid - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer, LLC
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Award Bid - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer, LLC
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7/23/2024 1:30:27 PM
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Board of Public Works
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Projects
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7/23/2024
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• When the return (i.e. column end) water temperature reaches 145ºF (±5ºF), <br />start raising the water temperature to 175ºF (+5 to 7ºF). <br /> <br />• After downstream and column end of the liner tubes water temperature <br />equals 175ºF (±5 to 7ºF), start timing and maintain that temperature for 3 <br />hours minimum. <br /> <br />Post Cure Note: If the thermocouples are reading incorrectly, very low (i.e. less <br />than 175ºF), or there is an excessive amount of water running in and around the <br />old pipe, increase the post cure for one additional hour and re-evaluate the <br />thermocouple readings. <br /> <br />5) Cool down the water slowly from 185ºF to 100ºF at a rate no faster than <br />30ºF/hr. <br /> <br />III. Cured-in-place pipe liners 18.0-22.5 mm thickness. <br /> <br />• Slowly raise temperature of the return water (i.e. column end) to 145ºF <br />(±5ºF). The downstream water temperature should be 150ºF (±5ºF). <br /> <br />Temperature Equilibrium Note: The temperature difference of the water <br />between the upstream and downstream ends of the tube will vary depending on <br />the size of the pipe, the size of the water heater, the condition and size of the <br />circulation hose, and the capacity of the circulation pumps. Therefore, it is very <br />important to monitor the water temperature on both ends to ensure a proper cure <br />is accomplished. <br /> <br />• When the return (i.e. column end) water temperature reaches 145ºF (±5ºF), <br />start timing and maintain the temperature for 1 hours minimum. <br /> <br />• After 1 hour, increase the downstream water temperature to 175ºF (±5ºF) <br />and the return water temperature to 175ºF (±5ºF) in a minimum of 1 hour. <br /> <br />• When the return water temperature reaches 175ºF (±5ºF) start timing and <br />maintain that temperature for 3 hours minimum. <br /> <br />Post Cure Note: If the thermocouples are reading incorrectly, very low (i.e. less <br />than 150ºF), or there is an excessive amount of water running in and around the <br />old pipe and the liner, increase the post cure for one additional hour and re- <br />evaluate the thermocouple readings. <br /> <br />• Cool down the water slowly from 175ºF to 100ºF at a rate no faster than <br />25ºF/hr. <br /> <br />
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