scan update segment 15497, 18716 ROW OCS-G26958

United States Department of the Interior BUREAU OF SAFETY AND ENVIRONMENTAL ENFORCEMENT

Gulf of Mexico OCS Region 1201 Elmwood Park Boulevard

New Orleans, Louisiana 70123-2394

In Reply Refer To: GE 1035A November 13, 2018

Ms. Denise McGuire Shell Pipeline Company LP 150 N . Dairy Ashford Houston, Texas 77079

Dear Ms. McGuire:

Reference is made to Shell Pipeline Company LP's (Shell pipeline) request dated November 7, 2018, received by this office on November 8, 2018, to lower Maximum Allowable Operating Pressure (MAOP) of Pipeline Segment No. (PSN) 15497 from 3,650 psi to 3,599 psi by removing external hydrostatic pressure credit. The PSN 18716 will also have MAOP of 3,599 as it is tied-in subsea with PSN 15497.

Pipelines are stated as below:

Segment No.

Size (Inches)

Length (feet)

Service Origin Destination

15497 20-24 287,517 Oil A(Tahiti Spar) A (Boxer) Green Canyon Green Canyon Block 641 Block 641

18716 20 100 Oil Subsea Manifold 20/24-inch SSTI Green Canyon Green Canyon Block 597 Block 597

Assigned Right-of-Way Number: OCS-G26958

Pursuant to 30 CFR 250.1000(b), your application is hereby approved.

Segment No.

MAOP (psig)

MAOP Determination

15497 18716

3,599 3,599

Pipeline Design Subsea Segment

Sincerely,

m|V/| A l Digitally signed by DIIVI /AL BIMALSHRESTHA Q U D F Q T N A Date:2018.11.13

Dnmio i nn ]4.06.24.06m

Bryan A. Domangue Acting Regional Supervisor Regional Field Operations

Shell Pipeline Company LP P.O. Box 2648 - Woodcreek. A226 Houston, Texas 77252-264B Denise.McGuire@Shell.com

November 7, 2018

Ms. Angie Gobert, GR1035A Bureau of Safety and Environmental Enforcement 1201 Elmwood Park Blvd. New Orleans, LA 70123-2394

R E : O F F S H O R E LOUISIANA GC641 T A H I T I SPAR - GC19A T A H I T I SPAR 20/24" O I L P I P E L I N E , JUMPER AND MANIFOLD OCS-G26958, S E G M E N T 15497 AND SEGMENT 18716 RIGHT-OF-WAY MODIFICATION MAOP D E R A T E

Dear Ms. Gobert:

In accordance with the provisions contained in Tide 30 CFR 250.1000(b) Shell Pipeline Company LP hereby submits application for the proposed modification to the Tahiti Spar 20/24" Oil Pipeline, ROW OCS-G26958, Segment 15497 and jumper/manifold Segment 18716, Offshore Louisiana.

The proposed modification includes reducing the approved MAOP to 3599. The MAOP of 3650 psig originally approved by BSEE utilized external water head pressure as an allowance in the MAOP calculation, which is not recognized by the DOT under 49 CFR Part 195 and the formula called out in the regulations (195.106). Removing this external water head pressure allowance on the 24" x 0.857" wall thickness portion of the pipeline results in an MAOP of 3599 psig utilizing the DOT formula.

Process Safety Flow Diagram SD80249, Rev 04 is submitted in support of this application.

The applicable fee of $4,169 can be tracked by referring to Agency Tracking ID #75610995838. If you need additional information, please contact me at 832-762-2487.

Sincerely,

Denise McGuire Attorney-in-Fact Shell Pipeline Company LP, Bv its General Partner Shell Pipeline GP LLC

Attachments

Ms. Angie Gobert Bureau of Safely and Hnvironmenta! Enforcemertt November 7, 2018

cc: Shell Pipeline Company LP Todd Crisp, Facility Kngineer Rahul Shridhar, Sr. Facility F.ngineer Michael Mitchcl, Sr. Facility 1 Engineer Nick Stone, Operations Supervisor Rico Okvianto, Sr. Project Manager Jason Dollar, Technical (Consultant - Offshore

f rom. • Sent: Wednesday. November 7. 2018 9:00 AM To; McGuire, Denise D SPLC-DPB/31 <-l • _ McGuire •

Subject; Pay.gov Payment Confirmation; BSEE Pipeline ROW Modification Application - BY

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Application Name: BSEE Pipeline ROW Modification Application - BY Pay.gov Tracking ID: 26DC6MBO Agency Tracking ID: 75610995838 Transaction Type: Sale Transaction Date: 11/07/2018 09:59:43 AM EST Account Holder Name: Denise McGuire Transaction Amount: $4,169.00 Card Type: Visa Card Number: — — 7 1 7 0

Region : Gulf of Mexico Contact; Denise McGuire 832-762-2487 Company Name/No: Shell Pipeline Company LP, 02289 Pipeline Segment No.: 15497, 18716

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GREEN CANYON 641 PLATFORM 4000' FSW COORDINATES

X=2,382.451.279'

Y=91922,671.863'

LAT=27- 19'33.267"N

LONG=90- 42'50.946"W

GREEN CANYON 19 PLATFORM 750' FSW COORDINATES

X=2.286,946•

Y=10,1461442'

LAT=27- 56.748'N

LONG=90- 59.821'W

PRODUCING TRANSPORTING PRODUCING OPERATOR OPERATOR OPERATOR

HIGH = 3135 PSIG LOW = 765 PSIG

MWP= 3333 PSIG

FROM CRUDE PIPELINE PUMPS

TO CRUDE BUY BACK METER

DESIGN 3705 PSIG

AT lOO'

TOPSIDES

HULL RISER

MSL

FLEX JOINT | \ / |

20" HULL RISER

SCR

PIPEUNE FROM GC-641 TO GC-19 HAS _ REDUNDANT PSH'S ON THE INCOMING

WILL CLOSE THE REDUNDANT SDVS WHEN A VALUE AT OR ABOVE 1800 PSIG TO PREVENT OVERPRESSURE OF THE 1800 PSIG MAOP DOWNSTREAM AMBERJACK PIPING

10" SCH. 80 (0.594" W.T.) A-106B (B31.3) P=2252 PSIG

20" SCH. 80 (1.031" W.T.) API 5L X-52

B31.3 - P =>1941 PSIG

MAOP=1800 PSIG ASME B31.3

MAOP=1800 PSIG ASME B31.4

24" SCH. 80 (1.031" W.T.) API 5L X-60 (2134 PSIG O .6)

24"

20" SCH. 40 (0.593" W.T.) API 51 X-60 (2134 PSIG O .6)

TAHITI PARTNERS

AMBERJACK PIPEUNE CO

20" SCR APPROX. 6.000 FT. OF 20.00" x 0.938" W.T. API 5L X-65 DSAW (3658 PSIG O .6)

SUBSEA -SLED

PIPEUNE APPROX. 90.720 FT. OF 24.00" x 0.857" W.T. API 5L X-70 DSAW (3599 PSIG 0 .72)

PIPEUNE APPROX. 27,920 FT. OF 20.00" x 0.785" W.T. API 5L X-70 DSAW (3956 PSIG 0 .72)

24"x20" H X I - ^

I I

24" SCH. 40 (0.688" W.T.) API 5L X-60 (2064 PSIG O .6)

TOPSIDES

JACKET ESD

TO 20" AMBERJACK PIPELINE

TO ST-301 MAOP=1800 PSIG

TO 12" POSEIDON PIPEUNE

SSTI IN SS359 MA0P=2188 PSIG

TO 16" BOXER PIPELINE

TO SS-241 MAOP=1440 PSIG

FLOW

PIPEUNE APPROX. 133.807 FT. OF 24.00" x 0.942" W.T. API 5L X-70 DSAW (3956 PSIG 0 .72)

APPROX 900 FT. STATIC RISER OF 24.00" x 1.125" W.T. API 5L X-65 DSAW UPPER 40' OF RISER WITH 1/2" NEOPRENE COATING FBE. (3656 PSIG O .6)

PIPEUNE APPROX. 26,831 FT. OF 24.00" x 0.955" W.T.

M>l 5L X-70 DSAW (4011 PSIG O .72)

-r - NATHAN KING HENDERSON = = License No. 34378 = ^.PROFESSIONAL ENGINEER^

JV 01, 2018

THIS PROFESSIONAL ENGINEERING STAMP VERIFIES ONLY REVISION NO 04 TO THIS DRAWING. IT DOES NOT COVER OVERALL DESIGN AND/OR OPERATION RESPONSIBILITY.

PIPFI INF FACILITIES TO BE INSTAII FO

BEL (SEE DETAILS ON SCHEMATIC)

SHUT DOWN VALVES

ANSI 1500# RTJ, FULL OPENING, TRUNNION MOUNTED BALL WITH DOUBLE ACTING PNEUMATIC ACTUATORS AND VOLUME BOTTLES.

FLANGES IN RISERS AND PIPELINE ANSI 1500||l RTJ

FITTINGS ALL WELD FITTINGS MSS-SP-75 . Y - 6 5 OR Y - 7 0 ALL FLANGE STUD BOLTS AND NUTS TEFLON COATED OR EQUIVALENT.

CATHODIC PROTECTION

SACRIFICIAL ANODE SYSTEM 1. TYPE OF ANODE: ALUMINUM, ZINC & INDIUM ALLOY 2. SPACING: 320 FT. 3. WEIGHT: 300 LB. 24" O.D. 228 20" O.D.

DESIGN DATA AND FLOW RATES

PIPEUNE AND RISER SYSTEM

CESISM COPES;

PESI6N FLUID; MAXIMUM DESIGN PRESSURE:

WORKING PRESSURE;

DESIGN TEMPERATURE:

DOT 49 -CFR-195 ANSI B31.4

3650 PSIG

150T

OPERATING TEMPERATURE: 122 'F-142T

AVERAGE SC;

DESIGN FLOW RATE;

UFTFR DESIGN:

30 TO 31- API

GC-641 TO SUBSEA SLED: 200,000 BPD SUBSEA SLED TO GC-19: 350,000 BPD

INDICATES DEVICES SHOWN ON THE SAFETY ANALYSIS TABLE (SAT) WHICH ARE NOT REQUIRED AS DEFINED BY THE SAFETY ANALYSIS CHECKLIST (SAC) IN API RP 14C

TOPSIDES - gC19A

THREE IDENTICAL METERS: M l , M2 Ic M3; 90,000 BPD MAX./EACH FAURE HERMAN: M3 CAN GO TO POSEIDON, BOXER, OR AMBERJACK.

LEGEND X GATE VALVE

[33] BALL VALVE

l ^v l CHECK VALVE

PNEUMATIC OPERATOR

Q

CONTROL VALVE

MASS FLOW METER

PRESSURE SAFETY VALVE

REDUCER (CONCENTRIC)

PUMP

{ P S V j PRESSURE SAFETY VALVE

^ S V ^ a O W SAFETY VALVE

(SDV^ SHUT DOWN VALVE

(PSH^ PRESSURE SAFETY HIGH

(PSL ) PRESSURE SAFETY LOW

W -NO,

DESCRIPTION OF REVISION ELEC MEOT ENGRlENOR

04

03

0 2

1 1 / 0 1 / 1 8

0 9 / 1 5 / 1 1

8 / 2 2 / 0 6

7/11/06 12/07/05

REVISED TAHITI 2 4 " PIPEUNE DESIGN AND MAOP PRESSURES AS NOTED

REMOVED GATE VALVE AND ADDED BALL VALVES

ADD METER TAGS & SWITCHING VALVES

PRESSURE SETTING CHANGES

ORIGINAL ISSUE

03106

03109

DEE

TC

SM

TPC

AMBERJACK OFFSHORE CRUDE

PL SEG-GC641 (TAHITI) TO GC19 (BOXER)

THIS DOCUMENT IS CONFIDENTIAL AND IT SHALL NOT BE REPRODUCED OR REDISTRIBUTED WITHOUT PRIOR PERMISSION. NEITHER THE OPERATOR NOR THE OWNER

MAKE ANY WARRANTY AS TO THE CORRECTNESS OR COMPLETENESS OF THE INFORMATION CONTAINED ON THIS DRAWING, AND THE USER ASSUMES A l l RISK OF LOSS TO

PERSONS AND PROPERTY AS A RESULT OF RELIANCE THEREON.

FLOW DIAGRAM - S A F E T Y SCHEMATIC TAHITI 24" PIPELINE

M.MARTINEZ 1 2 / 0 6 / 0 5 S D - 80249 REVISION

04