One of the most popular uses for the Telog Hydrant Pressure Recorders (HPRs) is to monitor and analyze customer pressure complaints. The HPR is ideally suited for this application because it is rugged, highly portable and can give a complete, time stamped picture of the pressure differential between the customer’s water pressure and the water pressure being delivered by the local utility.
Attach an HPR to the hydrant that is closest to the customer’s building and on the same main.
Attach a second HPR to the customer’s water line. This can be done using a garden hose and an HPR with Telog’s garden hose adapter. Fill the hose with water and attach the HPR. Once the HPR is securely attached, completely open the customer’s spigot.
Using Telog’s HPR-31 units for fire flow testing provides you with more accurate information than conventional, manual methods of testing. Because the HPR is always recording and time stamping data, the testing can be performed and completed by one person. The testing procedure is based on guidelines in the NFPA 14 and the AWWA M17 manuals, so you will be sure to meet regulation requirements.
Performing fire flow tests is easy using the HPR fire flow kit. Simply attach one HPR to the residual hydrant and one HPR with diffuser to the flow hydrant. Using your Palm data transfer unit (DTU), you can do on-the-spot data analysis. You can also take the Palm DTU back to your office and view the data on your PC.
The kit comes with two HPRs, a diffuser, communications cables and space for a Telog Palm DTU all in a heavy duty foam lined case.
Numerous water authorities have instituted flushing programs to help maintain the health of their distribution system. In many mains, water moves through at less than two miles per hour. Flushing removes built up sediment that restrict the water. When you use the Telog Hydrant Flow System you can simultaneously accomplish two other important functions — hydrant capacity testing and reduce unaccounted for water.
Fire flow testing and C-factor testing are two of the most common field tests used for model calibration. Using Telog HPRs can greatly simplify that testing (see Telog’s application notes on fire flow & C-factor testing) and the data from Telogers software can be exported to many of today’s software modeling packages.
C-factor testing with HPR units will measure discharge and head loss. By using HPRs, a task which normally requires three or more people becomes a one-person job. There is no need to station a person at each hydrant. The HPR automatically records and time stamps the data. This information can then be used to calculate pipe roughness in terms of Hazen-Williams C-factor.