BP Gas Pipeline Crossing Analysis · • Gas pipelines pending relocation per BP and CDOT. US 550...
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US 550/160 Connection South Design Build NHPP 5501-029, Sub Account 22420 Page 1 of 2 BP Gas Pipeline Crossing Analysis To: Kevin Walters, CDOT From: Nick Zoller, PE and Michelle Morgan, PE Date: April 01, 2019 Subject: BP gas pipeline crossings along US 550 Introduction In the area of proposed improvements for the US 550/160 Connection South, Design Build Project there are four BP crossings of these four crossings three of which are likely to be relocated. The fourth crossing at Station 862+15 will remain in place. The design evaluated each location for potential design changes/options at each of the four known crossing locations to see if relocation could be avoided. Based on the analysis the four BP crossings, the project reference design does allow for vertical profile and drainage modifications to meet the desired clearance requirement of 5-feet with a minimum of 3-feet each of the subject crossings. In addition to the design changes the other option that can be considered, is the placement of a concrete protection slab. US 550 Station 822+74 • Existing survey shows three existing gas pipelines crossing at a skew. • The project reference design is shown in a cut on east side of US 550. • A vertical profile raise is possible in this location to meet clearance requirements. A profile raise will also affect the following access roads and grading onto their property. o East access road onto the Weasleskin property o West access road onto the Snowcap Sod Farm property o West driveway entrance onto the Bachman property • The roadside ditches running along both sides of US 550 should be maintained. • The ditch running along the west side of US 550, can be conveyed in an 18-inch to 24-inch culvert under the access road. The proposed culvert will cross the existing gas pipeline and clearance requirements will need to be maintained. • A small ditch running along the east side of US 550 may be needed to maintain roadside ditch flows from about Station 834+50 to the south. • Gas pipelines pending relocation per BP and CDOT. US 550 Station 843+50 • The existing survey shows one existing gas pipeline under existing US 550. • Proposed gas pipeline extension under proposed US 550. • The project reference design is shown in a cut.
Transcript of BP Gas Pipeline Crossing Analysis · • Gas pipelines pending relocation per BP and CDOT. US 550...
US 550/160 Connection South Design Build
NHPP 5501-029, Sub Account 22420
Page 1 of 2
BPGasPipelineCrossingAnalysis
To: Kevin Walters, CDOT
From: Nick Zoller, PE and Michelle Morgan, PE
Date: April 01, 2019
Subject: BP gas pipeline crossings along US 550
Introduction In the area of proposed improvements for the US 550/160 Connection South, Design Build Project there
are four BP crossings of these four crossings three of which are likely to be relocated. The fourth
crossing at Station 862+15 will remain in place.
The design evaluated each location for potential design changes/options at each of the four known
crossing locations to see if relocation could be avoided. Based on the analysis the four BP crossings, the
project reference design does allow for vertical profile and drainage modifications to meet the desired
clearance requirement of 5-feet with a minimum of 3-feet each of the subject crossings. In addition to
the design changes the other option that can be considered, is the placement of a concrete protection
slab.
US 550 Station 822+74
• Existing survey shows three existing gas pipelines crossing at a skew.
• The project reference design is shown in a cut on east side of US 550.
• A vertical profile raise is possible in this location to meet clearance requirements. A profile raise
will also affect the following access roads and grading onto their property.
o East access road onto the Weasleskin property
o West access road onto the Snowcap Sod Farm property
o West driveway entrance onto the Bachman property
• The roadside ditches running along both sides of US 550 should be maintained.
• The ditch running along the west side of US 550, can be conveyed in an 18-inch to 24-inch
culvert under the access road. The proposed culvert will cross the existing gas pipeline and
clearance requirements will need to be maintained.
• A small ditch running along the east side of US 550 may be needed to maintain roadside ditch
flows from about Station 834+50 to the south.
• Gas pipelines pending relocation per BP and CDOT.
US 550 Station 843+50
• The existing survey shows one existing gas pipeline under existing US 550.
• Proposed gas pipeline extension under proposed US 550.
• The project reference design is shown in a cut.
US 550/160 Connection South Design Build
NHPP 5501-029, Sub Account 22420
Page 2 of 2
• A vertical profile raise of the reference design profile is possible in this location to meet
clearance requirements.
• The proposed roadside ditch running along the east side of US 550 may not be needed. Flows
can continue to sheet flow to the east.
• The existing roadside ditch running along the west side of US 550 should be maintained. This
ditch might not need to be deepened based on capacity.
• Gas pipeline pending relocation per BP and CDOT.
US 550 Station 862+15 (Critical Location)
• The existing survey shows three existing gas pipelines crossing existing and proposed US 550.
• The constraints of nearby driveways and field accesses, limits the vertical profile raise.
• Clearance between existing gas pipelines and reference design median ditch is approximately
4.9-feet.
• There is a current conflict with the proposed roadside ditch running along the east side of US
550. However, this ditch can be eliminated allowing runoff to sheet flow to the east. This ditch is
shown in the reference design to convey flows to a pond or sand filter for water quality
treatment. Permanent water quality is not required for the US 550 project.
• The roadside ditch running along the west side of US 550 may be needed but does not appear to
be an issue for the gas pipelines.
• Casing for the gas pipelines to be extended to the limits of the project ROW per BP and CDOT.
US 550 Station 899+50
• The existing survey shows one existing gas pipeline under existing US 550 and proposed SB US
550.
• Proposed gas pipeline extension under proposed NB US 550.
• The project reference design profile is in approximately 10-feet of fill.
• Roadside ditches might not be required in this area.
• Gas pipeline pending relocation per BP and CDOT.
9420 W. Sam Houston Parkway NorthRoom N1.217Houston, Texas 77064
24" MIN.(See Note 1)
GG
GGGG
EE
CONFIGURATION PROFILE
PROPOSED BASE
POSSIBLE PROFILE RAISE
SEE SHEET 2 FOR X-SECTION
EXISTING GAS LINES
NO
AT
TR
NO
AT
TR
VP
C=820
+15.0
0
EL.=
6607.3
5'
VPI=822
+00.0
0
EL.=
6608.3
7'
VPI=826
+20.0
0
EL.=
6619.0
3'
VP
T=828
+55.0
0
EL.=
6620.5
7'
V.C. = 370.00'
SSD = 2405'
K = 186.31
V.C. = 470.00'
SSD = 809'
K = 250.14
VP
C=826
+50.0
0
EL.=
6621.7
9'
VPI=828
+50.0
0
EL.=
6624.4
5'
VP
T=830
+50.0
0
EL.=
6625.4
5'
1.33%
V.C. = 400.00'
SSD = 1504'
K = 483.41
820
+00
825
+00
830
+00
100'0' 50' 200'
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DRAFT: NOT FOR CONSTRUCTION (05/22/19)
819+00 820+00 821+00 822+00 823+00 824+00 825+00 826+00 827+00 828+00 829+00 830+00 831+00818+00817+00816+00
6600
6610
6620
6630
6600
6610
6620
6630
822+74
GAS LINE CROSSINGS
US 550
US 550
Final ROW pendingthis access location
EX
EO
P
EX
EO
P
EXISTING GAS LINE
BASE CONFIGURATION
PROPOSED ACCESS ROAD
BASE CONFIGURATION
PROPOSED US 550POSSIBLE PROFILE RAISE
6600
6610
6620
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140-10-20-30-40-50-60-70-80-90-100-110-120-130-140
STA.822+746600
6610
6620
20'0' 10'
0'
20'
10'
*THE BLUE LINE REPRESENTS THE TOP OF PIPE. PIPELINE DEPTHS ARE ASSUMED TO BE 5' BELOW EXISTING GROUND.
EXIS
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GAS LINE CROSSINGS
US 550
5'
2'
BM
GG
GG
WW
WW
CONFIGURATION PROFILE
PROPOSED BASE
POSSIBLE PROFILE RAISE
EXISTING GAS LINE
SEE SHEET 2 FOR X-SECTION
PROPOSED GAS LINE
VP
C=84
4+7
5.0
0
EL.=
663
1.2
4'
VPI=84
6+25.0
0
EL.=
6632.2
3'
VP
T=84
7+7
5.0
0
EL.=
6633.8
0'
1.05%
V.C. = 300.00'
SSD = 2809'
K = 771.21
VP
T=84
0+00.0
0
EL.=
6631.8
4'
VP
C=84
1+7
5.0
0
EL.=
6634.6
3'
VPI=84
4+00.0
0
EL.=
6638.2
2'
VP
T=84
6+25.0
0
EL.=
6639.3
4'
1.59%
0.50%
V.C. = 450.00'
SSD = 1211'
K = 410.97
84
0+00 84
5+00
850
+00 100'0' 50' 200'
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US 550
DRAFT: NOT FOR CONSTRUCTION (05/22/19)
CR 219
843+50
GAS LINE CROSSINGS
US 550
839+00 840+00 841+00 842+00 843+00 844+00 845+00 846+00 847+00 848+00 849+00 850+00 851+00 852+00 853+00 854+00
6620
6630
6640
6650
6620
6630
6640
6650
EX
EO
P
EXISTING GAS LINE
BASE CONFIGURATION
PROPOSED US 550POSSIBLE PROFILE RAISE
PROPOSED GAS LINE
6620
6630
6640
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140-10-20-30-40-50-60-70-80-90-100-110-120-130-140
STA.843+506620
6630
6640
20'0' 10'
0'
20'
10'
EXIS
T
RO
W
RO
W
*THE BLUE LINE REPRESENTS THE TOP OF PIPE. EXISTING DEPTH IS ASSUMED AND PROPOSED DEPTH CAN BE ADJUSTED AS NECESSARY.
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DRAFT: NOT FOR CONSTRUCTION (05/22/19)843+50 (2)
GAS LINE CROSSINGS
US 550
2'5'
5'
G
G
WW
WW
WW
WW
WW
WW
GG
WW
GG
GGGGGG
WW
GGGG
GG
WW
POSSIBLE PROFILE RAISE
SEE SHEET 2 FOR X-SECTION
EXISTING GAS LINES
CONFIGURATION PROFILE
PROPOSED BASE
VP
C=860
+50.0
0
EL.=
664
7.1
5'
VPI=862
+50.0
0
EL.=
664
9.2
5'
VP
T=864
+50.0
0
EL.=
6650.2
5'
VP
C=869
+00.0
0
EL.=
6652.5
0'
0.50%
V.C. = 400.00'
SSD = 2172'
K = 730.82
VP
C=857
+7
5.0
0
EL.=
664
4.7
4'
VPI=859
+00.0
0
EL.=
664
5.4
3'
VP
T=860
+25.0
0
EL.=
664
7.3
7'
VP
C=862
+00.0
0
EL.=
6650.0
8'
VPI=863
+50.0
0
EL.=
6652.4
1'
VP
T=865
+00.0
0
EL.=
6653.1
6'
VP
C=867
+55.0
0
EL.=
6654.4
3'
VPI=869
+55.0
0
EL.=
6655.4
3'
0.55%
1.55%
1.55%
0.50%0.50%
V.C. = 250.00'
K = 250.12
V.C. = 300.00'
K = 285.71
855
+00
860
+00
865
+00
87
0+00
100'0' 50' 200'
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US 550
DRAFT: NOT FOR CONSTRUCTION (05/22/19)862+15
GAS LINE CROSSINGS
US 550
855+00 856+00 857+00 858+00 859+00 860+00 861+00 862+00 863+00 864+00 865+00 866+00 867+00 868+00 869+00 870+00
6630
6640
6650
6660
6710
6630
6640
6650
6660
EX
EO
P
EX
EO
P
EX
CL
EXISTING GAS LINE
POSSIBLE PROFILE RAISE
WEST - 6'
7.5'
BASE CONFIGURATION.
PROPOSED US 550
6630
6640
6650
6660
0 10 20 30 40 50 60 70 80 90 100 110 120-10-20-30-40-50-60-70-80-90-100-110-120
STA.862+156630
6640
6650
6660
20'0' 10'
0'
20'
10'
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DRAFT: NOT FOR CONSTRUCTION (05/22/19)862+15 (2)
GAS LINE CROSSINGS
US 550
BEYOND THESE LOCATIONS, PIPELINE DEPTHS ARE ASSUMED TO BE 5' BELOW EXISTING GROUND.
THE BLUE LINE REPRESENTS THE TOP OF PIPE. THE WEST, EX CL, AND EAST DIMENSIONS WERE MEASURED IN THE FIELD.
EX CL - 8'
EAST - 5'
E
WW
WW
WW
GG
GG
SEE SHEET 2 FOR X-SECTION
EXISTING GAS LINE
CONFIGURATION PROFILE
PROPOSED BASE
PROPOSED GAS LINE
VP
C=895
+00.0
0
EL.=
6684.6
7'
VPI=897
+50.0
0
EL.=
6686.8
2'
VP
T=900
+00.0
0
EL.=
6685.5
7' -0.50%
V.C. = 500.00'
SSD = 1044'
K = 367.84
895
+00
900
+00
905
+00 100'0' 50' 200'
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US 550
DRAFT: NOT FOR CONSTRUCTION (05/22/19)899+50
GAS LINE CROSSINGS
US 550
892+00 893+00 894+00 895+00 896+00 897+00 898+00 899+00 900+00 901+00 902+00 903+00 904+00 905+00 906+00 907+00
6660
6670
6680
6690
6660
6670
6680
6690
EX
EO
P
EX
EO
P
EXISTING GAS LINEPROPOSED GAS LINE
BASE CONFIGURATION
PROPOSED US 550
6660
6670
6680
6690
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140-10-20-30-40-50-60-70-80-90-100-110-120-130-140
STA.899+506660
6670
6680
6690
20'0' 10'
0'
20'
10'
EXIS
T
RO
W
EXIS
T
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W
*THE BLUE LINE REPRESENTS THE TOP OF PIPE. EXISTING DEPTH IS ASSUMED AND PROPOSED DEPTH CAN BE ADJUSTED AS NECESSARY.
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GAS LINE CROSSINGS
US 550
5'
