WEST LEDA – SAT DIVING PLATFORMLEARNING EXPERIENCE

By

Ranjith Kumar &Kuldipak Pednekar

PROJECT OUTLINE

First of it’s kind project, as so far Sat diving system is never placed on any Jack up rig

S4 sat system is most compact diving system available in market.

Typical Fast Track project

Type: Jack up rig

Name: West Leda

Owner: Seadrill

Vessel Info

Type: Saturation diving

Name: S4 Sat system

Owner: Cal Dive

Diving system Info

INITIAL SCOPE OF WORK FROM SEADRILL

Design Saturation Diving System (4 person chamber) Platform at a height of 5 to 6m above main deck.

General Arrangement of all S4 diving equipment is provided.

Need to arrange equipment on platform

Weight of diving equipments around 100T

DESIGN PHILOSOPHY

Main chamber, HRC, Umbilical basket, Reclaim van, and Workshop to go on platform

In case of emergency, HRC (diving rescue boat) to be launched in sea by using onboard crane

Platform not to extend beyond anchor pocket arrangement

Platform to be well above Anchor winch

ISO FORMAT MINUTES OF ONBOARD MEETING WITH RIG MASTER

MEETING AT CAL DIVE WORKSHOP

Initial Preparation

General layout drawing showing all items of diving system

3D model prepared on basis of initial scope of work

Summary of meeting In case of emergency

HRC have to have its own launching system

Opening for HRC to launch

HRC launching davit with self powered winch arrangement

Two more containers to be added

Gas quads to be located on platform

ISO FORMAT MINUTES OF THE MEETING CONDUCTED AT CAL DIVE

KICK OFF MEETING AT PPL SHIPYARD

PARTIES PRESENT

Seadrill ABS PPL shipyard Cybermarine

SUMMARY

PPL has been given two weeks deadline to finish complete job

AutoCAD drawing to be provided to PPL

ABS was more concerned about Stability

DRAWING PREPARED

Platform structural drawing

Main deck structural drawing

INFORMATION TRANSMISSION

INFORMATION TRANSMISSION

Initial info received from client via email, same has been forwarded

Minutes of meeting prepared and sent

Design changes have been conveyed over phone

Hand sketches made at site sent via email

Drawings collected from client scanned and sent via email

Photos clicked by phone sent via mobile network

Maximum information collected and forwarded

SAMPLE HAND SKETCHES

SAMPLE CONCEPT HAND SKETCHES

SAMPLE DESIGN PHILOSOPHIES

INFORMATION TRACKING

Created hard copy of project file for easy reference

All layout drawings, information collected in hard copy format, concepts hand sketches and design philosophies maintained in project file

MODIFICATIONS DONE IN INITIAL STAGE

INTERFERENCES AT SITE

Interference of platform support bracings with vent pipe

Interference of offloading hose with support bracing

Interference of pipe with underdeck newly added web

VENT PIPE INTERFERENCE

PIPE INTERFERENCE WITH UNDER DECK WEB

DESIGN CHANGES

Overturning procedure Platform extension on offloading platform Introduction of HRC lifting spreader Collapsible beam design change Introduction of hydraulic ram arrangement and later

same is canceled Umbilical basket location change Opening on platform for umbilical to pass Fixed platform for HRC outboard access HRC frame height increase Change in HRC launch opening

DESIGN CHANGES

HRC leveling to match with flange on main chamber Collapsible foldable platform to access control panel

on main chamber which was later changed to fixed platform

New inboard platform to be added to access valves on reclaim van

Introduction of Air diving system HRC pull out pad eye Container access platform modification Pad-eye reorientation on HRC lifting spreader Winch shifted on platform

OVERTURNING PROCEDURE

ISSUES ENCOUNTERED

INCORRECT DETAILS HRC FRAME PULLEY

INCORRECT ORIENTATION OF PULLEY ON HRCFRAME

Extension plate was provided on aft where as it was required on fwd side

INCORRECT ORIENTATION OF PAD EYE ON HRCLIFTING SPREADER

Top pad eye orientation has been changed to suit sheave assembly with hydraulic pin

UMBILICAL BASKET

Wire lengths were different and drawing was not followed properly

Issue was solved by using wire at correct location

PHOTO GALLERY

PLATFORM WAITING FOR SAND BLASTING

•NEW ACCESS LADDER •PULLEY ON HRC FRAME

HRC HOOKED UP TO MAIN CHANBER

BOTTOM VIEW OF HRC LAUNCH OPENING

TOP OF HRC

COLLAPSIBLE BEAMS WITH PIN ARRANGEMENT

HRC PULL-OUT PAD EYE

HRC FRAME

PULLEY ON HRC FRAME

FIXED PLATFORM TO ACCESS PANEL DOOR

CONTAINER ACCESS PLATFORM

AIR DIVING SYSTEM

AIR DIVING LAUNCHING PAD EYE

HRC LIFTING WINCH

SHEAVE ON TOP OF HRC LIFTING FRAME

HRC LIFTING HYDRAULIC SHEAVE

THANKS FOR YOUR PATIENCE