DISCLAIMER: Worksheet and calculations to be used solely for the purpose of estimating firm injection and withdrawal allocation capacities. Please contact MountainWest Pipeline Marketing and Scheduling for help.

Injection Allocation Estimator

FSS Shipper's annual working gas X

Sum of Clay Basin Annual Working Gas volumes Y

Today's available injection capacity Z

Firm Injection Allocation     (X / Y) * Z

Withdrawal Allocation Estimator

Firm Shipper's working gas remaining in storage A

Total working gas remaining for ALL FSS shippers B

Maximum possible reservoir deliverability today C

Sum of FSS shippers' minimum required deliverabilities D

FSS shipper's minimum required deliverability (MRD) E

Firm Withdrawal Allocation     ( (A / B) * (C - D) ) + E

Worksheet Notes:

The values in light blue can be changed to estimate a new calculation.

(Y) excludes MountainWest Pipeline's firm balancing account working gas volumes.

(Z) Injection capacity can range anywhere from 100,000 Dth/day to 325,000 Dth/day May to Oct for Clay Basin.

(C) Maximum possible deliverability can range anywhere from 175,000 dth/day to 750,000 dth/day Oct-Mar for Clay Basin.

MRD (Minimum Required Deliverability), as defined in the tariff, is equal to : The minimum withdrawal rate or quantity of gas that firm shipper may withdraw on a firm basis each day up to and including the last day of the withdrawal period, subject to shipper having working gas remaining in storage. It shall be determined by dividing shipper's annual working gas by the product of 150 days and the decimal equivalent of an 80% load factor. **This calculation may be skewed when using this tool during injection season (April-October). To estimate future calculations change the values in the light blue boxes.

The injection and withdrawal definition can be found in Part 2 Section 9.2 of MountainWest Pipeline's Tariff.

For interruptible withdrawal amount, please refer to the tariff Part 3 Section 10.2 b.

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