IOM AddPak R02
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15 Thermal Relief
Brodie offers both an injection point kit with a
blocking solenoid and thermal relief kit for appli-
cation where no contamination is required. This
is normally used for dyes and markers. Since the
injector block has a blocking solenoid and the
injection point kit has a blocking solenoid it is
necessary to relieve any thermal pressure build up
between them. The thermal relief kit is installed on
the inlet and outlet of the injector block. The injec-
tion point kit is installed in the fi eld by the user or
their contractor.
14 Process Fluid Connections
General
The process fl uid inlet and outlet connections are
3/8” FNPT. The inlet and outlet are marked in the
front of the AddPak. The inlet pressure must be
higher than the outlet to ensure proper injection.
Fluid Inlet and Outlet Piping
The piping from the additive pump to the AddPak
must be sized to ensure adequate fl ow to meet the
demand for injection. Remember to consider how
many injectors will be operating and the total fl ow
required to meet that demand. Distance from the
additive pump and the injectors is another thing
to consider when determining the pipe size. The
minimum tubing size to reach the maximum fl ow
of 3 GPM is typical 1/2”. Larger tubing or pipe may
be required based on the viscosity of the additive.
The outlet tubing from the AddPak to the point of
injection is 1/2”. We recommend using stainless
steel tubing. A check valve and isolation valve is
recommended at the point of injection into the
process line. This will prevent product fl ow from
contaminating the additive when the injector is in
the idle state. The check valve should be a postive
shutoff spring close check. The check valve should
be selected to open with positive pressure of 1 to
10 PSI. If you have multiple injectors piped to one
injection point then a check valve and isolation
valve should be installed for each injector.
