Award Bid - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer, LLC

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IV. Cured-In-Place Pipe Liners 24.0-33.0 mm thickness. • Slowly raise temperature of the return water (i.e. column end) to 155ºF (±5ºF) over the course of 2 hours minimum. The downstream water temperature should be 160ºF (±5ºF). Temperature Equilibrium Note: The temperature difference of the water between the upstream and downstream ends of the tube will vary depending on the size of the pipe, the size of the water heater, the condition and size of the circulation hose, and the capacity of the circulation pumps. Therefore, it is very important to monitor the water temperature on both ends to ensure a proper cure is accomplished. • When the return (i.e. column end) water temperature reaches 155ºF (±5F), start timing and maintain the temperature for 4 hours minimum. • After 4 hours, increase the downstream water temperature to 175ºF (±5ºF) and the return water temperature to 175ºF (±5ºF) in a minimum of 1 hour. • When the return water temperature reaches 175ºF (±5ºF), start timing and maintain that temperature for 8 hours minimum. Post Cure Note: If the thermocouples are reading incorrectly, very low (i.e. less than 160ºF), or there is an excessive amount of water running in and around the old pipe, increase the post cure for one additional hour and re-evaluate the thermocouple readings. • Cool down the water slowly from 175ºF to 100ºF at a rate no faster than 20ºF/hr.