Toptech Systems MultiLoad II User Manual

Chapter 5 – Product Flow Control
194
Firmware Version 3/4.31.37
5.9 RATIO BLENDING CONSIDERATIONS (EXCLUDING SMP)
When Ratio Blending, all product recipe components are flowing simultaneously. Any time Ratio Blending is
occurring, a flush requirement appears on the Status screen, since a mixture of components exists in the line.
Before the ratio-blended load begins, the algorithm decides which component to short. When the remaining
preset quantity is equal to the Line Flush Volume, the flow of all blended components is stopped. Then the flush
stage will begin, where only the Line Flush Component is flowing. All non-flush components in the product recipe
must have delivered their required volumes by this time. When blends are aborted before flush occurs or before
the Line Flush Minimum Volume has been delivered, the Line Flush alarm is activated. The volume of flush error
will be displayed on the Status screen.
If flush is involved with ratio blending, the setting of the Blend Check Alarm % can prevent loads of certain
quantities from being delivered, because the blend will be forced to be temporarily out of specification prior to
beginning the flush phase. This determination is made before loading starts.
Example
The Blend Check Alarm % is set to 5% and a preset of 1000 gallons is selected for a 60/40 load in which
component #2 is the flush component. The Flush Volume is 100 gallons. The 600 gallon requirement of
component #1 has to be completely delivered by the time the last 100 gallons of flush is started. When ratio flow
stops to begin the flush phase and before the flush is started the ratio will be 600/300. This will result in a 6.7%
error until the flush begins. The load will be stopped for a blend specification violation. To deliver 1000 gallon
loads in this case, the Blend Check % alarm setting will have to be relaxed to 7%.
Review the section on Ratio Blending in this chapter for configuration details.

The flush feature for loading straight product from a ratio blending preset works the same as
when the loading is conducted by a sequential recipe.
The following table shows how a 1000 gallon load is affected by each of the decision parameters. The product is
a 60/40 blend. Component #1 is 60% of the total and component #2 is 40% of the total. The Line Flush
Component is component #2. The Line Flush Volume is 100 gallons.
Line Flush Delivery for Various Line Flush Options – Ratio Blending
Component #
Desired Ratio
Quantity Delivered
Flush Option
Example 1
1
600
600
Take Flush from Matching Component
2
400
300
Flush
100
Flush component #2
Preset Total
1000
1000
Example 2
1
600
500
Take Flush From First Component
2
400
400
Flush
100
Flush component #2
Preset Total
1000
1000
Example 3
1
600
600
Take Flush From Last Component
2
400
300
Flush
100
Flush component #2

Toptech Systems MultiLoad II Specifications

General

Brand	Toptech Systems
Model	MultiLoad II
Category	Control Unit
Language	English