Subsurface LD-8 Water Leak Detector User Guide

Subsurface LD-8 Water Leak Detector

Operating Instructions

1. The LD-8 Leak Survey Tool is a “rod-based” acoustic listening instrument for listening for water leaks ·at hydrants, meters, and valves:
2. The LD-8 includes a 4-inch short contact rod, a 4-section contact rod set (threaded connections, each rod 13 inches) and an adapter rod_ as standard items: The adapter rod has female threads at both ends, and it is used for attaching the optional 40-inch Long Contact Rod or. the optional 60-inch Long Contact Rod.
3. The stereo headphones attach to the side of the LD-8 amplifier at this connector jack:
4. Two AA batteries go inside the battery compartment like this:
5. The LD-8 amplifier display has a two-digit display of loudness, out-of-range indicator, and low battery indicator:
6. The Low Battery Indicator flickers a “battery icon” when the battery power is low and the ON/OFF Button is depressed. Replace the batteries when the icon appears
7. The SENS Range Switch inside the battery compartment has 3 positions

With the switch in the.High position, the LO-S’s sensitivity is highest (for listening to small leaks). With the switch in the Low position, the LD-B’s sensitivity is lowest (for listening to loud leaks

How to Survey for Water Leaks

with the LD-8 Leak Survey Tool

1. The sounds of leaks in pressurized water pipes can travel for hundreds (even thousands) of feet in every direction down the mains and services

2. Different pipe materials and different pipe diameters transmit leak sounds down their pipe walls very differently:
   Distances Leak Sounds May Travel
   For a 5 gal/min leak at 60 psi pressure

3. The service line material is also very important when listening at meters or curb stops:
   For a 2 gal/min leak at 50 psi pressure
   If the distribution system experiences main breaks ( 5 to 10 gal/min or more) at certain times of the year and the mains are iron pipe or A/C pipe, then a “Hydrant Survey” can be effective and an efficient use of time. Listen at every hydrant in every block. If there is no hydrant for 500 ft., then choose a main valve. If the distribution system has PVC mains and copper services, then an “Every Meter and Every Valve Survey” may be necessary. Particularly if the system experiences small leaks at the corp valves (taps into mains

4. The leak survey “strategy” must consider the pipe materials, pipe diameters, service line materials, and types of leaks expected.

5. If you hear a leak, listen at the adjacent service lines, hydrants, and valves. If the sound is louder, then you are closer. If you cannot tell which one is louder with your ears, then study the two-digit display:

The leak is closest to the main valve because the two-digit display is higher here

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