1

PRS Pool Base at KillingøyRemote Hot tap Sveising av T-stykke for påkobling av grenrør i full drift, uten

bruk av dykkere

2 - Classification: Internal 2011-07-01

PRS Pool – What and Why?

• The PRS Pool is a cooperation between pipeline operators established in 1987:

− to be prepared in case of emergency repairs

− to share costs for investments and operations

− to maximise experience transfer and competence

− to provide services not readily supplied by commercial market

• PRS Pool is organised as a non-profit membership club, where members share operational costs based on an agreed formula. (Pipeline size, depth, length, transported medium).

• PRS Pool is a large tool pool of emergency preparedness equipment that allows fast repairs of offshore pipelines

• Statoil has the operating responsibility, and has on behalf of the owners and members entered into necessary contracts to ensure the system is operational at all times:

− equipment is stored, maintained and modified as necessary

− ensure access to well trained personnel, equipment and suitable vessels

Remote Hot Tap Technology

Diver assisted hot tap

Remote hot tapping

Retrofit tee hot tap

Jotun

1997

Gullfaks

2000

Åsgard Subsea Compression

2012

Tampen Link

2008

OL Hot Tap 860 m

2009

Gas Infrastructure Reinforcement

2016

Creating business opportunities

Ormen Lange

Ormen Lange field location

Pipeline Forum - 15th April 2010, IB Senteret – Forus Øst

Kjell Edvard Apeland

Ormen Lange Southern Field Development

Template A

Template B

Template D

Ormen Lange Offshore Project – SFD Scope

HTT1 Location

6

Ormen Lange - Phase I – Hot-tap Tees

- 6 Hot Tap Tee pieces

Installed:

Approximately 850 msw

Tee rotations 0° til 5°

Classif

ication:

Interna

l

TQP Challenges for Hot-tap

Secondary: Cut Ø 300 mm hole with a WT of 50 mm

8 - Classification: Internal 2011-07-01

9 - Classification: Internal 2011-07-01

Cla

ssifi

cati

on:

Inte

rnal

201

1-

09-

16

10

Subsea Compression Station

Remote Hot Tap System - Retrofit Tee concept description

• Remote installation of a structural reinforcement clamp

containing the branch pipe

• Pressure barrier (seal) made by internal weld inside the

branch pipe

• Clamp to contain preliminary elastomeric seals to enable

initial sealing for “blow down” and welding

• Weld head placed inside branch pipe and branch pipe

section flushed, gas filled, cleaned, dried and prepared for

welding

• Weld head using main components from previously built

system for the Remote Operated Welding System (Remote

PRS)

Remote Hot Tap System – Retrofit Tee concept of sealing

• GMAW welding to provide a seal

at the “saddle” intersection of

branch and mother pipe

Animasjon

The welding quality for the Hot-tap is controlled by:

• - Extensive pre-qualification work performed by welding in the actual conditions (Welding parameters,

materials, temperatures, pressure and humidity)

• - The welding environment for the pre-qualification work is picked based on a "worst case" philosophy

(Qualifying for the extremities)

• - The pre-qualification work also covers sensitivity of the normal welding parameters/the equipment

• During the offshore welding, the process is computer controlled and monitored by an online QA/QC

software.

• - Acceptance levels for the welding process monitoring are defined during the pre-qualification period

and loaded into the offshore QA/QC system.

• A close visual inspection is also performed and recorded after each pass offshore.

• Once the welding has been completed, a hydrostatic pressure test is performed as the final verification.

System status June 2012: Several full scale deep water trials have successfully been carried out at water

depths down to 350 msw. The QA/QC system has been proven and the principles are accepted by both

Statoil material department and DnV.

Material testing has been performed for the full scale subsea welds with excellent results.

The Åsgard Subsea Compression project is currently in the process of closing out the last qualification

activities for the system and is targeting first offshore use on a live pipeline system in August 2012.

13 - Classification: Internal 2011-07-01

F-Pipe scanner med contact probes

Contact probes for •Corrosion •Wall thickness •Lamination •Surface defects

F-Pipe scanner with ovality probes

Distance probes for

•Ovality •Diameter •Weld height

16 - Classification: Internal 2011-04-06

Hot tap tee assembly

tap – sveising av T-stykke for påkobling

av grenrør i full drift, uten bruk a dykkere

Presenters name

Presenters title

E-mail address ……@statoil.com

Tel: +4700000000

www.statoil.com

Classification: Internal 2012-05-15 17