Titan ProPAC-3, Manual

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15
Definitions Continued
Flush Start % Decrease - Feature provides the user with the ability to define the initiation of the
flush. The programmed value entered for % Decrease defines the decrease of normal steady-state product
flow (Long average) when the flush begins. Example: Normal product loading 600 gpm, Flush Start %
Decrease programmed 20%. During slow flow, as the product flow rate decreases by 20% to 480 gpm, the
flush will be initiated at 480 gpm flow rate. Only used with Frequency Line Flush.
Blocking Control Valve - The blocking control valve is typically used in conjunction with product
line flushing. However, it may be used in conjunction with typical additive installations as well. The
blocking control valve is typically a solenoid control valve installed at the additive injection point. This
solenoid valve is in addition to the solenoid control valve located on the ProPAC-3 injector. The blocking
control valve is controlled by the ProPAC-3 microprocessor and it is opened (energized) when additive/dye
injections are prescribed for a product load. The valve is used primarily to prevent additive or dye from
entering the product line during all periods where additive/dye is not called for. Without the feature
implemented, thermal expansion and pressure relief in the product line can cause small amounts of dye to
leach into the product line causing a section of dyed product to flow into a clear truck. By using the
Blocking Control Valve, this problem is minimized. The blocking control valve is opened when the first
injection is made and is closed at the initiation of line flush. See Dye System Considerations Section 6 -
pg.3 for installation recommendations. Programmable Enabled or Disabled.
When authorize mode is enabled, the Blocking Control Valve is not opened until the first injection is made.
This prevents situations where a lane permissive is provided to a number of injectors even though flow is
not definite on the dyed product riser, hence allowing the dye line to relieve into the product line. See Dye
System Considerations Section 6 - pg.3.