PWA

Introduction

The pipeline works authorisation is a set of documents that are submitted by the operator to the regulator for health and safety purposes. The following information must be provided on the application for PWA consent are:

Field Description
Field Layout
DepCon (see below)
Table A - Provides information for th epipline position, and size
Isometric Schematics of the Pipelines
Consent of Crossings (from owners of other lines)

DepCon1:

Description of material to be deposited;
Quantity to be deposited;
In the case of rock dumping, the maximum size to be deposited;
Location of the proposed site;
Length, width and height above seabed level which the material will attain when deposited;
Description of any consultations undertaken or planned; and
Approximate date on which deposition is proposed to begin and the approximate duration of the operation.

Note that where there are no objections it takes approximately four months from receipt of the application to issuing the authorisation

Notable Projects

Project Name	Project Number	Notes
BAOBAB	KW 0463	Notable due to the Pipe in Pipe nature
Greater Plutonio	KW 0617	Deep Water, using SAFEBUCK
Qatar Gas	KW	Large Diameter Pipe Shallow Water Snake Lay Solution

Other Projects

Project Name	Project Number	Notes
EPC2B	KW 0728	Controlled Buckles on Existing Pipeline Crossings
Algeria Pipeline	KW 1071	Onshore
Deep Panuke

Codes & Standards

Company	Title	Doc Number / Date
SAFEBUCK JIP	Safe Design of Pipelines with Lateral Buckling - Design Guideline	BR02050/SAFEBUCK/B August 2004
DNV	Global Buckling of Submarine Pipelines	DNV-RP-F110
DNV	Submarine Pipeline Systems (Strain Based Limit State)	DNV-OS-F101

Course Notes

Author	Title	Notes
C. Sicilia	Lateral Buckling Assessment and Mitigation Design
Trevor Gee IBC	Pipeline Course

Books

Author	Title	Chapter
Mikael Braestrup	Design and Installation of Marine Pipelines	6.5

Papers

Author	Title	Notes
Hobbes, R. E.	In-service Buckling of Heated Pipelines, Journal of transportation Engineering, ASCE, Vol. 110, No.2, March 1984, pp. 175-189	Approximate method for determining propensity for lateral buckling
Taylor, N. and Gan, A. B	Submarine pipeline Buckling – Imperfection Studies, Jour. Of Thin-walled Structures, Vol. 4, 1986, pp 295-323	A developed version of ‘Hobbs’, including the effects of initial OOS

Prepared Calculations

Title / Software	Description	Owner / Athor
Hobbs / Excel	Predicts the onset of buckling	KAJW / CSG