We recommend that a qualified licensed contractor perform this type of winterization method. The blowout method utilizes an air compressor with a cubic foot per minute (CFM) rating of 80-100 for any 2" or less mainline. The compressor is attached to the mainline via a quick coupler, hose bib, or other connections located beyond the backflow device. For additional winterization procedures, we highly recommend contacting the local dealer for the most common local practices.
IMPORTANT: Compressed air should not be blown through any backflow or flow meter device.
If you need to blow upstream from where the flow meter is located, we recommend bypassing the meter temporarily by using one of two options.
Please refer to the chart below for specific lengths needed to install an SCH 80 or galvanized nipple. If these sizes are not available at your local Distributor, we recommend gluing two PVC male adaptors and the correct length of PVC pipe.
| Model | Description | Male-Thread NPT | Nipple Length |
|---|---|---|---|
| HC-075-FLOW | ¾" NPT body, male thread with 1" NPT male adapter | 1" NPT | 5" |
| HC-100-FLOW | 1" NPT body, male thread with 1.5" NPT male adapter | 1 ¼"NPT | 5" |
| HC-150-FLOW | 1½" NPT body, male thread with 2" NPT male adapter | 2"NPT | 11 3/4" |
| HC-200-FLOW | 2" NPT body, male thread with 3" NPT male adapter | 2 1/2" BSPP | 11 3/4" |
A second option would be to install PVC tee-ball valves on each side of the meter. This is the recommended option during NEW installation. The meter will have to be removed manually after the blowout to make sure any residual water is not sitting inside through the winter months.
IMPORTANT: The pipe flowing water into the flow meter needs to be a MINIMUM of 10 times longer than the width of the pipe. The pipe flowing water away from the meter needs to be a MINIMUM of 5 times the width of the pipe.
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