UDT 2020 Maintaining quality in the submarine supply chain. - - PowerPoint PPT Presentation

Carolyn Valentine & Matthew Palmer 26th May 2020

UDT 2020 – Maintaining quality in the submarine supply chain.

Introduction

Lloyd's Register 2

• Background of the

submarine supply chain

• Management of

Transverse issues

• Potential problems in the

submarine supply chain

• Can we use the principles

from the ship supply chain?

• Level of assurance based
• n safety function

Submarine supply chain

Lloyd's Register

Verify Visit Report

Site team

Submarine builder/maintainer

Supplier Assurance

Purchase Order

ITP

Independent third party verification (optional)

Supplier ITP ITP

Comms Comms

Builder/maintainer design teams input

Kick Off

Basic Differences (Transverse issuses)

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• Stealth Power
• Submarines Stability
• Closed Atmosphere
• Defect Tolerance
• Weight Watchers
• System Integration

What are the potential problems in the submarine supply chain

• Local vs global
• Long lead items ‘lock out’
• Maintain the design
• Limited supply chain and bespoke items
• Spares
• Record keeping

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Surface ship supply chain and its application for submarines

• Developed over many years
• Ship Rules demanded by industry to protect assets
• Built on vast a knowledge & experience base
• Classification Society Rules work across the shipping industry
• Readily adopted by naval ships
• Share common features
• Similar compliance demands
• Exist in large numbers so good knowledge & experience base
• Resource pressure on standards

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Surface ship supply chain and its application for submarines

• Compliance with prescriptive standards doesn’t address every safety risk.
• Ship standards set minimum safety requirements.
• Whole boat transverse requirements are derived from the ConOpS.
• Transverse whole boat issues apply to every design level.
• Higher quality requirements depending on risk category.
• Ship standard with modifications or additions is an acknowledgement the

rule does not in itself address the requirements.

• This approach can provide cost effective solutions for the designer.

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Level of assurance bases on safety function

• How and where the material/component is used?
• Consequence of failure
• Safety function could be broken down by hazard:

– Structure – Watertight integrity – Buoyancy and control – Propulsion – Power generation and distribution

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Lloyd's Register

Manufacturing Risk

Risk Consequence of Material Failure

Likelihood Likelihood per Annum

Catastroph ic Critical Significant Marginal Negligible

Fatalities per Event >10 10 to >1 1 to >10-1 10-1 to >10-2 <10-2

Frequent

>1

Probable

1 to >10-1

Occasional

10-1 to >10-2

Remote

10-2 to >10-3

Improbable

10-3 to >10-4

Highly Improbable

10-4 to 10-5

Incredible

<10-5

Safety Function (c) Pipe Manoeuvring & Control Safety Function (p) Pipe Clips Power & Propulsion Safety Function (c) Pipe Manoeuvring & Control Safety Function (c) Compressed Air System Manoeuvring & Control Safety Function (c) Compressed Air System Manoeuvring & Control

• Supplier Performance
• Novel Process
• Product Complexity
• Product Value
• Programme Critical
• Common Mode Failure

Safety Function (i) Pressure Hull Valve Strength & WT Integrity Safety Function (i) Pressure Hull Back Up Valve Strength & WT Integrity Safety Function (i) Pressure Hull Back Up Valve Strength & WT Integrity

Level of assurance based on safety function

Lloyd's Register

Pressure Hull Valve

Functions

Watertight integrity

Transverse

Whole Boat

• Transverse
• Survivability
• Product Verification
• Categorisation

System

Pressure and Piping System components

• Performance Requirements
• Construction and Installation
• Trim and Compensating System
• Sea Water Cooling Systems
• System Testing, Integration and

Trials

Component

Pressure and Piping System components

• Performance Requirements
• Assessment
• Materials
• Copper and copper alloy piping

components

• Valves
• Testing

Materials

Rules for Materials

• Approved Works
• Testing Procedures
• Copper Alloys
• Corrosion Prevention

System & Component Risk Combinations

Lloyd's Register

Risk based approach

• Traditional

– Inflexible – Assumes everything works as new – Is difficult to run ‘what ifs’

• Goal Based

– Flexible – Allows for manipulation at lowest level – Can be extended if circumstances change – Copes with multiple degradation of systems – More easily updated

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Safety case

Summary

Lloyd's Register

• Consequence of failure drive higher build quality
• Product & Build Quality key to through life reliability & availability
• Supplied product is the foundation of build quality
• Quality cannot be INSPECTED into a product
• SQEP Independent verification provides Assurance
• Verification supported by well defined solutions
• Solutions that reflect product risk category
• Quality can be BUILT into the product

Lloyd's Register 14

Thank you

Carolyn Valentine & Matthew Palmer

LR Submarine Programme Manager

Naval Centre of Expertise

2nd Floor, The Sion, Crown Place, Nailsea Bristol BS48 1RB T +44 (0) 1275 515000 M +44 (0) 7764430644 E roger.coles@lr.org www.lr.org/marine