Offshore Presentation for BJ1

8/11/2019 Offshore Presentation for BJ1

1/22

ASPROFOS ENGINEERING S.A.

OFFSHORE SECTION OF STEFANIALIVERI

PIPELINE

Construction Supervision Overview


2/22

Project Overview

Installation of a N.G.H.P Offshore Pipeline

with the purpose to supply natural gas to

Evia island and a Power Plant in Aliveri.

Size of the pipeline :20

Total length of the Pipeline approximately

14.2 km

Maximum water depth along the pipeline

route: 70m.

Offshore pipeline was consist of two offshore

sections, joined together offshore by Above

Water Tie In method.

2


3/22

3

Pipeline Route Layout

Varnavas

Landfall

KaravosLandfall

AWTI


4/22


5/22


6/22

The Team

The Team was divided into two (2) sub teams.

The Supervising Engineering Team (Field):

Site Construction Supervision Head

Site Offshore Pipeline Supervising Engineer

Site Shore Approach Supervising Engineer

Site Engineer

Management/Review /Support Team (Head Offices):

Project Management

Pipeline Specialists

6


7/22

Main Documents Review

Project Management Documents: Project Overview Manual, Quality Manuals, Project Control Docs, Projects HSE Docs etc

Design Engineering Documents:

PIPELINE ON BOTTOM STABILITY ANALYSIS

PIPELINE FREE SPAN ANALYSIS

CATHODIC PROTECTION PHILOSOPHY AND DETAILED DESIGN REPORT

PIPELINE PROTECTION DESIGN

TECHNICAL SPECIFICATION FOR SACRIFITIAL ANODES

GEOTECHNICAL CROSS SECTIONS

VESSEL POSITIONING PROCEDURE

SURVEY REPORT & CHARTS (PRE LAYAS LAID)

FLOODING, CLEANING, GAUGING AND HYDROTESTING PROCEDURE

PIPELINE ABOVE WATER TIE IN MANUAL

7


8/22

Main Documents Review

Design Engineering Documents: SHORE APPROACH METHOD

START-UP MOORING ARRANGEMENT

SHORE PULL SEQUENCE

PIPELINE AWTI SEQUENCE

PIPES TRANSPORTATION (METHODS)

PRE-LAY SURVEY CHARTS FOR ANCHOR CORRIDOR

GEOTECHNICAL STUDY FOR THE TRENCH DREDGING AND BACKFILL

PRE-LAY SURVEY AT LANDFALLS

TRENCHING AND BACKFILLING MANUAL

WAVE PREDICTION STUDY

WAVE PREDICTION STUDY AT LANDFALL POINTS

WELDING COATING PROCEDURE

8


9/22

9

Main Field Activities Sequence

Pipe/Material/Equipment Deliverance.

Installation of Anchors and Concrete Blocks.

Dredging Activities Mooring Activities

Welding/Sandblasting/Coating Activities

Shore Pull Activities

Normal Pipe Laying

AWTI

Backfilling/Wave Protection/ Reinstatement


10/22

10

Main Field Activities

1. Pipe/Material/Equipment Deliverance.


11/22

11


2. Anchoring - Mooring.


12/22

12


3. Dredging Activities


13/22

13

Main Field ActivitiesTrench Long. Profile


14/22

4. Welding/Sandblasting/Coating Activities

14



15/22


16/22


17/22

17


6. Normal Pipe Laying


18/22

18


7. AWTI


19/22


20/22

20


8. Backfilling/Wave Protection/ Reinstatement


21/22

21

Wave Protection Design


22/22

22

284, EL. VENIZELOU str. GR-176 75 KALLITHEAATHENS, GREECE

Tel.: +302109491600

Fax: +302109491610

http://www.asprofos.gr

THANK YOU FOR YOUR ATTENTION!

22