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Andy Schwaller
Garfield Cou nty Com m u n ity Development Department
108 Eight Street, Suite 401
Glenwood Springs, CO 81601
Re: G35, 826, N23 Gathering Pipelines
Purpose:
The purpose of this letter is to present the calculated design pressures for the G35, 826, N23
Gathering Pipelines,
Background:
Caerus Oil and Gas, LLC owns and operates natural gas facilities within the Piceance Basin of
Garfield County. Garfield County Development has requested certification of the design
pressures for new natural gas pipelines. This certification must be done by a Professional
Engineer registered within the state of Colorado.
ASME Design Pressure Formula:
The American Society of Mechanical Engineers Code for Pressure Piping (ASME 83L-8-20L8) was
used for calculating the design pressure, which is the calculated allowable design pressure of the
system. Section 841" Steel Pipe has a steel pipe design pressure formula (Section 841.L.L).
P = 2St FET
D
Where:
P = design pressure (psi)
5 = pipe yield strength (ps¡)
1 = pipe wallthickness (in)
g = pipe outside diameter (in)
F = design factor
E = longitudinaljoint factor
T = temperature derating factor
The input variables for each pipeline and the associated calculations were provided by Caerus,
double-checked against the values provided in the ASME standard, and are detailed in the
attached spreadsheet.
I
Results
Ten pipe segments were analyzed using the design pressure formula from ASME 831-8-2018 and
the results are in Table 1 below.
Table 1: Design Pressure
Pipeline Design Pressure
(psi)
L2-inch G35 pad to N23CDP L,529
4-inch G35 pad to Divide Road ROW 4,382
l2-inch G35 remote frac pad to F26
lntersection
L,02O
6-inch G35 remote frac pad to G35 pad L3,563
12-inch 826 pad to N23CDP 1,529
6-inch F26 remote frac pad to 826 pad L3,563
L0-inch N23CDP to F26 lntersection 2,825
L0-inch N23CDP to F26 lntersection 2,825
L2-inch N23CDP to F26 lntersection 1.,529
4-inch F26 remote frac pad to N23CDP 4,382
Conclusions:
KLJ agrees with Caerus's choice of design variables and the specified pipe materials for each
line/application. The actual operating pressure of these Caerus systems will be well below the
calculated allowable design pressure. Further, each of these pipelines will be hydrotested as
part of Caerus's pipef ine construction quality assurance program.
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Please let me know if you have further questions,
41216
Sincerely,
Marc Kenney, PE
Enclosure(s): Calculation Spreadsheets, Select Pages from ASME 83L-8-2018
KU Project #: 2LO7-00252.Lt
KU