Nrf 013 Pemex 2009 English

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PEMEX EXPLORATION AND PRODUCTION TECHNICAL STANDARDIZATION COMMITTEE

DESIGN OF SUBSEA PIPELINES IN THE GULF OF MEXICONRF-013-PEMEX-2009

Rev.: 10Page 2 of 63

DESIGN OF SUBSEA PIPELINES IN THE GULF OF MEXICO This reference cancels and replaces NRF-013-PEMEX-2005 of March 18th, 2006.

Document Number NRF-013-PEMEX-2009

December 21th, 2009PETRLEOS MEXICANOS AND SUBSIDIARY ENTITIES STANDARDIZATION COMMITTEE

Page 1 of 63PEMEX EXPLORATION AND PRODUCTION TECHNICAL STANDARDIZATION SUB-COMMITTEE

PETRLEOS MEXICANOS AND SUBSIDIARY ENTITIES STANDARDIZATION COMMITTEE

DESIGN OF SUBSEA PIPELINES IN THE GULF OF MEXICONRF-013-PEMEX-2009

Rev.: 0Page 32 of 63

APPROVAL SHEET

PREPARED BY:

ENG. LUIS ORTIZ HERNNDEZWORK GROUP COORDINATOR

PROPOSED BY:

ENG. JESS HERNNDEZ SAN JUANVICE PRESIDENT OF PEMEX EXPLORATION AND PRODUCTION TECHNICAL STANDARDIZATION SUB-COMMITTEE

APPROVED BY:

DR. RAL A. LIVAS ELIZONDOPRESIDENT OF PETRLEOS MEXICANOS AND SUBSIDIARY ENTITIES STANDARDIZATION COMMITTEE

CONTENTSCHAPTER PAGE0.INTRODUCTION71.PURPOSE92.SCOPE93.APPLICATION FIELD94.UPDATING135.REFERENCES136.DEFINITIONS147.SYMBOLS AND ABBREVIATIONS178.DEVELOPMENT188.1Subsea Pipeline Design188.1.1 Design considerations188.1.1.1User basis188.1.1.2Design basis198.1.1.3Route selection198.1.1.4Geophysical and geotechnical studies208.1.1.5Materials208.1.1.5.1Pipe208.1.1.5.2Accessories208.1.1.6Stress Loads208.1.1.6.1Pressure208.1.1.6.2Live loads208.1.1.6.3Dead loads208.1.1.6.4Dynamic loads218.1.1.6.5Pressure increase due to fluid expansion218.1.1.6.6Loads due to contraction and thermal expansion218.1.1.6.7Interaction soil-pipe218.1.1.7Riser218.1.1.8Expansion Spool228.1.1.9Connections, accessories, flanges and valves228.1.1.10Monitoring spool and transition piece228.1.1.11Pig traps238.1.1.12Minimum separation between regular pipelines238.1.1.13Concrete coating238.1.1.14Burial of the pipeline238.1.1.15Marine growth238.1.1.16Subsea crossing248.1.1.17Free spans248.1.1.18Vorticity248.1.1.18.1Oscillations in parallel direction to the velocity vector278.1.1.18.2Oscillations in perpendicular direction to the velocity vector278.1.1.19Fatigue278.1.1.20Expansion and flexibility288.1.1.21Branch connections298.1.1.22Hydraulic Analysis298.1.1.23Corrosion298.1.1.23.1External corrosion298.1.1.23.1.1Anti-corrosive coating298.1.1.23.1.2Cathodic protection308.1.1.23.2Internal corrosion308.1.2Subsea pipeline classification318.1.2.1Pipelines transmitting flammable and/or toxic gases318.1.2.2Pipelines transmitting flammable and/or toxic liquid318.1.2.3Pipelines transmitting non-flammable or non-toxic fluids328.1.3Mechanical effects328.1.3.1Internal Pressure328.1.3.1.1Required minimum thickness338.1.3.1.1.1Design thickness348.1.3.1.1.2Corrosion tolerance348.1.3.1.1.3Fabrication tolerance348.1.3.1.1.4Thickness for high temperature in fixed restricted pipelines358.1.3.2Revision of thickness for other conditions368.1.3.2.1Longitudinal tension (Tu)378.1.3.2.2External pressure378.1.3.2.2.1Collapse pressure (Pc):378.1.3.2.2.2Buckling propagation (Pp):388.1.3.2.3Bending moment (Mu)398.1.3.2.4Global buckling (Cg):408.1.3.2.5Formulation of design for combined load status418.1.3.2.5.1Tension and bending moment (Tu-Mu)418.1.3.2.5.2Axial load, bending moment and collapse pressure (Tu, Mu-Pc)428.1.4Hydrodynamic stability428.1.4.1Buoyancy analysis of buried pipeline458.1.4.2.1Wave height and current velocity468.1.4.2.2Swell and current direction478.1.4.2.2.1Bay of Campeche and Litoral Tabasco478.1.4.2.2.2North Zone and Lankahuasa478.1.4.3Oceanographic parameters for a return period of 100 years488.1.4.3.1Wave height and current velocity488.1.4.3.2Direction of the swell and current488.1.4.3.2.1Bay of Campeche and Litoral Tabasco488.1.4.3.2.2North Zone and Lankahuasa488.1.5Design document submission489.RESPONSIBILITIES499.1Petrleos Mexicanos and subsidiary entities499.2Pemex Exploration and Production Technical Standardization Sub-committee509.3Contractors5010.COMPLIANCE WITH MEXICAN OR INTERNATIONAL STANDARDS5011.BIBLIOGRAPHY5012.ANNEX54Annex A. Oceanographic information for the Gulf of Mexico.54Annex B. Conversion of the gas and light oil production in thousands of barrels of heavy crude oil equivalent.61

0. INTRODUCTIONThe recent development of oil fields in the Gulf of Mexico has involved an increase in the temperature and pressure of the fluids collected and transported to the relevant sites, which has caused an important increment in the compression strengths in straight parts of the pipeline due to thermic restriction caused by its interaction with the soil. Consequently, the pipeline tends to release the compression strengths while it experiments a configuration of secondary balance, i.e. buckling or weaving happens. The conditions on which the lateral or upheaval buckling happens depend on the various factors, such as soil strength, submerged weight, characteristics of the cross-section and the final straightness condition after the pipe is laid. Consequently, the design methodologies for high temperature (TA) and high pressure (PA) pipelines differ noticeably from the traditional design of subsea pipelines; therefore, this reference standard establishes the criteria that engineering designers of subsea pipelines shall take into account such as: criteria based on stresses, criteria based on buckling and use of mechanical devices (not expansion joints) to control lateral shifting. This is applicable to pipelines that operate at: high temperatures up to 150C (302F), pressures up to 351,5 Kg/cm2 (5 000 lb/in2) and water depth up to 200m (656,17 ft.).Additionally to the structural design criteria for TA and PA, the oceanographic parameters for hydrodynamic stability design in the Bay of Campeche, Litoral Tabasco, North Zone and Lankahuasa were included. In the case of the Bay of Campeche and Litoral Tabasco, besides updating the parameters, the depth water was extended to 200 m (656,17 ft.) and in the case of the North Zone and Lankahuasa, only the oceanographic parameters were updated and the depth continues to be 100m (328,09 ft.).This reference document was prepared in consideration and adherence to: Metrology and Standardization Federal Law, and its Regulation Public Works and Related Services Law, and its Regulation Acquisitions, Leases and Services for the Public Sector Law, and its Regulation General Rules for Hiring and Execution of Public Works. Guide for writing, structuring and presentation of Mexican standards NMX Z-13/1-1997. Guidelines for the Issuance of Petrleos Mexicanos and Subsidiary Entities Reference Standards. Policies, bases and guidelines in terms of public works and services related to the same for Petrleos Mexicanos, its Subsidiary Entities and Subsidiary Companies.

The following Pemex Subsidiary entities and Institutions participated in the preparation of this document: Pemex Exploration and Production (PEP) Petrleos Mexicanos. Instituto Mexicano del Petrleo (IMP). Supervisin y Desarrollo de Proyectos Marinos S.A. de C.V. Sacmag de Mxico, S.A. de C.V.

1. PURPOSETo establish the technical and documental requirements that shall be met for hiring the design engineering services for hydrocarbon transmission subsea pipelines located in the Gulf of Mexico. 2. SCOPEThis reference standard establishes the minimal requirements for the design of subsea carbon steel pipelines for the following conditions: Temperature up to 150C -8302F) Pressure up to 351, 5 kg/cm2 (5 000 lb/in2) Depths up to 200 m (656, 17 ft.) in the Bay of Campeche and Litoral Tabasco. Depths up to 100 m (328, 09 ft.) in North Region and Lankahuasa.

The above applies to pipelines laid either between platforms, or with beach approach as well as interconnections with existing pipelines or subsea wells in order to guarantee their integrity from various mechanical and hydrodynamic effects with the purpose to reduce the possibility of losing human lives, ecological damages, economical losses and physical damages of the facilities during their service life. It covers general considerations for the design as well as the classification of the pipelines according to the zone and fluid type that is transported. The expressions and safety factors that shall be used for the different requests to which the line is subjected are indicated. It includes the criteria for the hydrodynamic stability for the installation and operational phase, and the oceanographic parameters that shall be used according to the different regions in the Gulf of Mexico.This standard is not applicable for flexible or fabricated pipes made from another material like plastic reinforced with glass fiber. 3. APPLICATION FIELDThis standard is of general application and compulsory observance when hiring services, purpose of the same, carried out by work centers of Petrleos Mexicanos and Subsidiary Entities. Thus, it shall be included in the hiring procedures: public bid, bid call for at least three people or direct award as part of the requirements to be met by the supplier, contractor or bidder.

This standard is applicable in the design of subsea pipelines located in the Gulf of Mexico, in depths and zones delimited by the coordinates that are indicated below and that are shown in Figure 1.Geographic coordinates. N19 00, W93 30, N18 26 and W92 00 (Litoral Tabasco) to 200m (656, 17 ft.). N20 10, W92 40, N18 55 and W91 55 (Bay of Campeche) to 200m (656,17ft.). N2042, W9731, N2218 and W96 56 (North Zone) to 100m (328, 09 f.). N20 30, W96 53, N20 40 and W96 39; N20 10, W96 14 and N19 59, W96 29 (Zone Lankahuasa) to 100m (328,09ft).

UTM coordinates, according to North American Datum of 1927, information based on the Clarke ellipsoid 1866.UTM coordinates: X=447 373, 74; Y=2 100 776, 37; X=605 606, 89; Y= 2 038 297, 81 (Litoral Tabasco). X=534 832, 24; Y= 2 229 827, 27;