Mueller HYDRO GUARD HG-8 Standard, User'S Operation Manual

Page: 6 / 28

Page 6 of 28
Hydro-Guard® Installation Procedures & Site Evaluation
Each Hydro-Guard® installation is unique and will require a minimum of advance
planning. Prior to the installation of the device, the drainage patterns for the intended
installation location should be reviewed. The drainage pattern must permit discharged
water to flow away from the Hydro-Guard® or to be absorbed by the surrounding soil.
The Unit’s ground-level weather seal is designed to prevent infiltration by rainwater
and normal discharges when placed in areas with acceptable drainage. Some utilities
have opted to increase the excavation-site size creating a small drain field, or to
install their Units on concrete splash pads in order to direct runoff. In cold weather
applications multiple nightly flushes are effective in managing discharge volumes and
preventing the accumulation of ice.
Installation of the Hydro-Guard® HG-8 InGround Flushing System
The Hydro-Guard® HG-8 InGround Flushing System is housed in a Mueller® Thermal
Coil Box that is approximately 21 inches in diameter. The bury depth will vary
depending upon the depth of the utility’s water lines. The box is pre-constructed with
low lead NTP male threads. The box is to be placed by the contractor at a location
agreed upon by the end user. The box features coiled tubing that will route water from
the water utility’s potable water distribution line to the meter assembly, through the
HG-8’s flushing components, and discharge through a discharge service line which is
routed to an acceptable point of discharge (i.e., a storm sewer, swale, storm pond, etc.).
The meter and flushing assembly can be raised for maintenance and repair purposes
and then lowered back down into the box below the frost line. A medium density foam
insulation pad, freeze protection system, and cast iron lid help protect the flushing and
meter assembly from freezing in the winter.
WARNING: Proper lifting, loading and unloading tools and techniques must be followed
when handling this device. Damage to working components can occur if dropped.
Step 1
Remove the Hydro-Guard® HG-8 Unit from its packaging and inspect for possible
damage during shipping.
Step 2
Turn off the service line feed.
Step 3
Excavate a suitably sized ditch ensuring it is connected on one side to the utility’s
service line trench. Remove any debris that might create uneven pressure on the Unit.
Compact the bottom of the hole in order to minimize settling after installation. Place
#57 stone then non-compacted clean bedding material within the bottom of the hole.
Provide a bed of crushed gravel approximately 6 inches thick or place bricks or cement
blocks below the pit to allow for drainage and provide support.
Step 4
Slowly lower the Hydro-Guard HG-8 InGround Flushing System into place, pressing it
firmly into the non-compacted bedding material within the bottom of the hole.
Step 5
Bury the pit so the top edge is at ground level.
Step 6
Install the top of the approximately 1.5” below existing grade and ensure the cast iron
meter lid is level with existing grade.