HomeMy WebLinkAboutCalculated Design PressuresK:\Projects\OilGas\CaerusOilGas\2107-00252_Environmental&Construction Group\2107-00252.20 G13 Pipeline SWMP\Engineering\2-6_PIPELINE\ASME Pipeline Calculations for Gar Co\G13 Gathering Letter to Gar CO revised 2022.11.15.docx Page 1 of 3
1601 RIVERFRONT DRIVE (970) 450-7474
GRAND JUNCTION, CO 81501
November 15, 2022
Garfield County Community Development Department
108 Eight Street, Suite 401
Glenwood Springs, CO 81601
RE: G13 Gathering Pipelines
Purpose:
The purpose of this letter is to present the calculated design pressures for the G13
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 B31-8-
2018) was used for calculating the design pressure, which is the calculated theoretical
maximum allowable pressure of the system. Section 841 Steel Pipe has a steel pipe
design pressure formula (Section 841.1.1).
PD = 2St FET
D
Where:
PD = theoretical maximum allowable pressure (i.e., design pressure) (psi)
S = pipe yield strength (psi)
t = pipe wall thickness (in)
D = pipe outside diameter (in)
F = design factor
E = longitudinal joint factor
T = temperature derating factor
The input variables for each pipeline and the associated calculations were provided by
Caerus and are detailed on the attached spreadsheet.
K:\Projects\OilGas\CaerusOilGas\2107-00252_Environmental&Construction Group\2107-00252.20 G13 Pipeline SWMP\Engineering\2-6_PIPELINE\ASME Pipeline Calculations for Gar Co\G13 Gathering Letter to Gar CO revised 2022.11.15.docx Page 2 of 3
Results:
Seven pipe segments were analyzed using the design pressure formula from ASME
B31-8-2022 and the results are in Table 1 below.
Table 1 Theoretical Maximum Allowable Pressure
Pipeline Theoretical Maximum
Allowable Pressure (psi)
Maximum Operating
Pressure (psi)
(as per Caerus)
Segment 1 (Buried): New 6”
Gas Lift
3,516 1,200
Segment 2 (Buried): 12”
Surface Flowback
1,529 1,440
Segment 3 (Buried): 16”
Medium Pressure Gas
1,950 400
Segment 4 (Buried): 6” Frac
Line
13,563 8,500
Segment 5 (Buried): New
Internally Coated 12” 3-Phase
Gathering
1,529 1,440
Segment 6 (Buried): 12”
Water Delivery/Return
1,020 375
Segment 7 (Buried): 16” Low
Pressure Gas
1,622 200
Conclusions:
KLJ, Inc. 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 pipeline construction quality
assurance program.
Please let me know if you have further questions,
Marc J Kenney, PE (CO No. 41215)
Attachments:
Calculation Spreadsheet
Select Pages from ASME B31-8-2022
12/12/2022
143 Diamond Avenue 1601 Riverfront Drive
Parachute, CO 81635 Grand Junction, CO 81501
Pipeline Calculations as per ASME B31.8‐2018 Gas Transmission and Distribution
Piping Systems for the
G13 Gathering Pipelines
From Section 841 Steel Pipe:
P = (2*S*t)/D*F*E*T PD = Design Pressure (psi)
(aka theoretical maximum allowable pressure)
S = minimum yield strength of pipe (psi)
t = nominal pipe wall thickness (in)
D = outside diameter of pipe (in)
F = design factor
E = longitudinal join factor
T = temperature derating factor
PMO = Maximum Operating Pressure (psi)
Segment 1 (6" Buried Gas Lift Line)
ERW API5L X52 PSL2, FBE 14-16 Mills, Carbon Steel
D = 6.625 in OD
t = 0.280 in wall thickness
S = 52,000 psi
F = 0.80 Class 1, Division 1
E = 1.0 Electric Resistance Welded
T = 1.0 250F or lower
PD = (2*S*t)/D*F*E*T design pressure (psi)
PD = 3,516 psi
PMO = 1,200 psi
PD > PMO Pipe specified is acceptable
Segment 2 (12" Surface Flowback)
ERW API5L X52 PSL2, FBE 14-16 Mills, Carbon Steel
D = 12.75 in OD
t = 0.375 in wall thickness
S = 52,000 psi
F = 0.50 Class 3
E = 1.0 Electric Resistance Welded
T = 1.0 250F or lower
PD = (2*S*t)/D*F*E*T design pressure (psi)
PD = 1,529 psi
PMO = 1,440 psi
PD > PMO Pipe specified is acceptable
PMO provided by Caerus via 9/30/2022 email from
Jason Eckman, see table at end of calculations below.
K:\Projects\OilGas\CaerusOilGas\2107-00252_Environmental&Construction Group\2107-00252.20 G13 Pipeline SWMP\Engineering\2-6_PIPELINE\ASME Pipeline
Calculations for Gar Co\Pipe Calculations_Jina Page 1 of 3
Segment 3 (16" Medium Pressure Gas)
SMLS API5L X52 PSL2, FBE 14-16 Mills, Carbon Steel
D = 16 in OD
t = 0.375 in wall thickness
S = 52,000 psi
F = 0.80 Class 1, Division 1
E = 1.0 Electric Resistance Welded
T = 1.0 250F or lower
PD = (2*S*t)/D*F*E*T design pressure (psi)
PD = 1,950 psi
PMO = 400 psi
PD > PMO Pipe specified is acceptable
Segment 4 (6" Buried Frac Line)
ERW API5L X65 PSL2, FBE 14-16 Mills, Carbon Steel
D = 6.625 in OD
t = 0.864 in wall thickness
S = 65,000 psi
F = 0.80 Class 1, Division 1
E = 1.0 Electric Resistance Welded
T = 1.0 250F or lower
PD = (2*S*t)/D*F*E*T design pressure (psi)
PD = 13,563 psi
PMO = 8,500 psi
PD > PMO Pipe specified is acceptable
Segment 5 (New Internally Coated 12" Buried 3-Phase Gathering)
ERW API5L X52 PSL2, 14-16 Mills FBE, Carbon Steel
with NOV TK-70 ID Coating & UB Sleeves
D = 12.75 in OD
t = 0.375 in wall thickness
S = 52,000 psi
F = 0.50 Class 3
E = 1.0 Electric Resistance Welded
T = 1.0 250F or lower
PD = (2*S*t)/D*F*E*T design pressure (psi)
PD = 1,529 psi
PMO = 1,440 psi
PD > PMO Pipe specified is acceptable
K:\Projects\OilGas\CaerusOilGas\2107-00252_Environmental&Construction Group\2107-00252.20 G13 Pipeline SWMP\Engineering\2-6_PIPELINE\ASME Pipeline
Calculations for Gar Co\Pipe Calculations_Jina Page 2 of 3
Segment 6 (12" Water Delivery/Return)
ERW API5L X52 PSL2, FBE 14-16 Mills, Carbon Steel
D = 12.75 in OD
t = 0.250 in wall thickness
S = 52,000 psi
F = 0.50 Class 3
E = 1.0 Electric Resistance Welded
T = 1.0 250F or lower
PD = (2*S*t)/D*F*E*T design pressure (psi)
PD = 1,020 psi
PMO = 375 psi
PD > PMO Pipe specified is acceptable
Segment 7 (16" Low Pressure Gas)
ERW API5L X52 PSL2, FBE 14-16 Mills, Carbon Steel
D = 16 in OD
t = 0.312 in wall thickness
S = 52,000 psi
F = 0.80 Class 1, Division 1
E = 1.0 Electric Resistance Welded
T = 1.0 250F or lower
PD = (2*S*t)/D*F*E*T design pressure (psi)
PD = 1,622 psi
PMO = 200 psi
PD > PMO Pipe specified is acceptable
Table provided by Caerus with maximum operating pressures (PMO).
K:\Projects\OilGas\CaerusOilGas\2107-00252_Environmental&Construction Group\2107-00252.20 G13 Pipeline SWMP\Engineering\2-6_PIPELINE\ASME Pipeline
Calculations for Gar Co\Pipe Calculations_Jina Page 3 of 3
