Overview of Routing Methods

Lynx gives you seven different methods to use to determine the next delivery date for any given tank. Each tank can use whichever routing method works best and you may well have different combinations of routing methods within a single route. 

These should be reviewed periodically to insure accuracy. A good way to do this is to run report DR02 "Delivery History" and check the Efficiency Rating. If they are consistently low (like under 50%), you might want to change or modify the Routing Method used for that particular tank.


1. Degree Days . . . If you choose this routing method (and at least four deliveries have been made to the tank) the system will automatically calculate the Gallons Per Degree Day to project the next return date. 

Note: To accurately use the Degree Day method requires that you maintain the degree day file for your location each day. For help on how to do this, go to Update Degree Day Information.

What if you don't have enough history?

If you want to use the Degree Day method but do not have sufficient history for the tank (at least four deliveries), you can use any one of five different approaches. By the way, when you finally do get four deliveries, each of these approaches will automatically revert to using the actual delivery information and Degree Days to calculate the return dates.

Be sure to also enter the . This is where you set whatever percent you want the system to use in calculating a return delivery date. In other words, this is the calculated percent you do NOT want the customer to go below. This is typically in the range of 20% to 30%. Go to Borrow Another Tanks History for help on this.
Note:  This method ONLY applies if you use Degree Days or Degree Days and Gallons Per Day as your Routing Method. Entering delivery history is NOT necessary if you use Julian Dates, Interval, Driver Call, or Day of the Week type routing.


2. Gallons Per Day . . .  You enter the estimated number of gallons per day that the tank uses. The computer then automatically determines when to deliver next.

Example: Let's assume you have a water heater hooked to a 50 gallon tank that uses about one gallon of propane per day. If you fill the tank on 1-1-XX , in 42 days it will be out of fuel (50 gallons X 85 percent of the maximum filling capacity of the tank). The computer knows that you want to return when the tank reaches a certain minimum level (let's say that you've decided that's 20 percent). It will schedule the next delivery for 2-2-XX which is 32 days after the last delivery. By that time, the the customer will have used approximately 32 gallons leaving about 10 gallons in the tank (20 percent).
In this example you would enter a "1" to reflect the 1 gallon per day usage rate for the water heater, like this:


Be sure to also enter the  .  This is also used in calculating a new return date.


3. Degree Days and Gallons Per Day . . . This routing method uses a combination of both the Gallons Per Day and the Gallons per Degree Day calculations to determine the next delivery date (assuming you have at least four deliveries for this tank). For instance, this might be used if a customer has both a water heater (where usage is consistent and Gallons Per Day is the best way to estimate usage) and a heating appliance (where Degree Days is more appropriate).

Example: The system will automatically calculate the K-factor (Gallons per Degree Day) the same as with the Degree Day method described in Πabove, assuming you have at least four deliveries for this tank. You will then enter the Gallons Per Day and the Estimated Return Percent, like this:
Note: If there is insufficient historical data (less than four deliveries) to automatically calculate the K-factor (Gallons per Degree Day), use one of the methods described  above. 


4. Day of the Year (JULIAN) . . . You enter the days of the year (using Julian dates) that you want to make deliveries. Julian dates are sequential numbers assigned to each day of the year (for instance, January the first is "1", January the second is "2", January the third is "3" and so forth).

Example:  Let's say you want deliveries to be made to a particular tank on day 60, day 120, and day 180 of the current year. Left-click the "Routing Method" drop down menu and select Day of the Year(JULIAN) and then enter the Julian Days using the calendar like this:
Note:  After you enter the first Julian date, press the down arrow  key and enter the next date (and so on) or use the dedicated  buttons to add/remove dates.


5. Interval . . . Deliveries are scheduled based on a fixed interval. These intervals can be different between summer and winter.

Example:  Let's say you want deliveries to be made to a particular tank on a regular basis . . . every 4 weeks in the summer and every 2 weeks in the winter. This would be entered like this:
Note: It's up to you to tell the system if you want it to use either the Summer or Winter interval (depending on the time of year) by selecting one or the other in Routing Preferences. Like this:
Go to Set Up Routing Preferences for help on this.


6. Drivers Number of Weeks Till Return . . . The driver chooses the number of weeks until the next delivery.

Example:  The driver decides to return in 6 weeks, this is written on the delivery ticket and keyed into the system when the delivery invoice is entered. Simply key in the number of weeks until the next delivery in the "Weeks" text box  on the same line as the delivery. 


7. Day of the Week . . . This method allows you to deliver on a fixed schedule per week.

Example: You want to deliver to the account every Monday, Wednesday, and Friday, such as: