Bergen International Diving Seminar 2019TUP with SPHL CONCEPT

David ChampionDiving Manager

TYPICAL TUP SYSTEM

INDUSTRY GUIDANCE and STANDARDS

• Who Involved /Regulates

• Health and Safety Executive, PFEER, SCR

• Petroleum Safety Authority

• IMO, SOLAS

• IMCA D 052 & D 053 provides guidance

on equipment specifications

• OGP Report 478 describes

Hyperbaric evacuationplanning requirements

• DNV GL RP E403 provides SPHL Technical Specifications

ALL REFERENCE TO SATURATION DIVING OPERATIONS ONLY

HOWEVER –April 2017 – UK HSE Diving Inspectorate

Advice on the Emergency Evacuation of Divers, including Divers Involved in TUP Diving Operations

DSV Based TUP Diving

The introduction of TUP systems, and their use in deeper and longer duration dives means that there is the potential for divers to require longer duration decompression requirements.

The use of accelerated emergency decompression may not be appropriateas the primary means of evacuation due to the increased risk of decompression illness, and

the use of an SPHL may be considered to be more appropriate.

This decision will be based on a suitable and sufficient risk assessment. It is best to hold detailed discussions with HSE in relation to specific diving projects and systems.

INDUSTRY GUIDANCE and STANDARDS

TYPICAL TUP SYSTEM WITH SPHL

MINI SAT SYSTEM ?

• Single Door• Sealed using internal pressure• Unable to decompress Divers to surface• Requires Hyperbaric Evacuation Plan and Reception Facility

DSV ADAPTABILITY

TUP DIVING – NEW CONCEPT – WHY?

SubseaPartner Solution

• Diving Bell Access via Side Door• Access /Egress to DDC via SPHL cockpit• SOLAS Compliant• DNV Certified• Life Support Applicable to Diving Method

Member of Team A experiences DCS after Surfacing and Team B has past No Decom Dive Profileand an Abandonment is required

Team B immediately recovered to SPHL and transferred to EL and decompression Initiated. Team A blown down in Transfer Lock, Transferred to SPHLML with DMT and Therapeutic Initiated SPHL deployed

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TUP 70(21msw)/180 SCHEDULE Example Dive Profile

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ABANDONMENT - WHAT IF SCENARIO’S

Detached / Trapped Diving Bell requiring Stand-By Diver Intervention and external factor requiring vessel abandonment

Stand-By Diver recovered with Dive Team BTeam A (DMT) Blowdown in Transfer LockDeploy SPHLAll 7x Divers decompressed in ML & EL

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TUP 70(21msw)/180 SCHEDULE Example Dive Profile

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ABANDONMENT - WHAT IF SCENARIO’S

TUP DIVING – NEW CONCEPT - WHERE & WHEN

TUP DIVING – NEW CONCEPT - WHERE & WHEN

TUP DIVING v SURFACE DIVING COMPARISON

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24 Hour Tidal Diving

TUP

SlackWater

In-WaterDecom

TUP Diving 30msw/ 110mins =440 mins Bottom Time ( Shallow Saturation)

In-Water Decom 30msw /50mins schedule = 200 mins Bottom Time

TYPICAL MANPOWERREQUIREMENTS

Position Saturation Diving Conventional Surface Diving

TUP Diving

Offshore Manager 1 1 1

Dive Supervisors 4 4 4

Saturation Divers 15 (3 in decom) 0 0

Divers 2 10 14

Life Support Personnel 6 0 0

Dive Technicians 2 2 2

TOTAL 28 17 18

£ £31,981.59 £ 10,282.94 £ 12,861.72

TUP DIVING – NEW CONCEPT – COST ANALYSIS

OR in Water Productive Times Cost Per MinuteSat Diving = £72.68Surface Diving = £ 51.41TUP Diving = £ 29.23

• TUP Diving is an Accepted method of Diver Intervention.• Need to consider Hyperbaric Evacuation due to longer decompression times compared to conventional surface

Diving Techniques, IE- SUR D02 and In-Water. • TUP Diving with Hyperbaric Evacuation offers significant cost savings (estimate 50% dependent on project

requirements) in comparison to shallow Saturation Diving in the range up to 40msw – 50msw.• At present there is no industry guidance for TUP Hyperbaric Evacuation.• In an abandonment situation it is safer to Decompress Divers in the SPHL and on reaching ambient pressure the

SPHL is considered a Lifeboat• TUP Hyperbaric Evacuation does not require any Hyperbaric Reception Facility.• Not practical to adapt existing DSV,s for TUP Diving – unable to Decompress Divers.

SUBSEAPARTNER SOLUTION TO OFFER THE FIRST

• DNV certified, Lightweight System with a Bespoke DDC installed in a SOLAS compliant SPHL.• Capable of Mobilising within 24 hours.• Potential to re-commence Diving Operations from Installations.• Available for 2020 Season or earlier if required.• Have already developed TUP Decompression Tables and Procedures.

QUESTIONS?

CONCLUSIONS