3d technical design td - rehau · 3d technical design - summary • uk based specialist heat...

3D TECHNICAL DESIGN LTD.

Always in Partnership

Heat Networks

De-risking the Civil Environment

&

Installation Cost Comparison

23rd March 2017

PRESENTATION CONTENTS

1. Introduction to 3D-Techncial Design.

2. Best Practice Route Proving/Development.

3. Buried Network Project Development/Planning.

4. Design and Installation Quality.

5. CAPEX considerations.

6. Installation Cost Comparison Study.

7. Any Questions.

3D TECHNICAL DESIGN - SUMMARY

• UK Based Specialist Heat Network – Buried Infrastructure Consultant.

• Practical Backgrounds of Designing, Delivering and Expanding City

Wide UK Schemes for over 15 years.

• Focused on the early de-risking of complex projects through:

• Technical and Commercial Feasibility

• Proving Routes and Major Infrastructure Crossings.

• Stakeholder Liaison.

• Detailed Network Design.

• GPR and 3D Modelling.

• Project Planning and Development

• Driving down CAPEX through early identification, mitigation and

management of risks, and establishing shallow and clear environments

within congested areas.

3D TECHNICAL DESIGN LTD.

COLLABORATIVE PARTNERSHIP STRUCTURE

Collaboration with a mature network of specialists across the Industry

District Energy

Project

Client

Contractor

Consultant

Reduce Network Costs

Improve Quality

Reduce Disruption

Risk Management

Detailed Planning

Accurate Tenders

Improved Safety

Technical Submissions

CURRENT UK MARKET/DESIGN PROCESS

Commercial and delivery process differs from Best Practice.

Contractor often prices and plans against a GA and available Service

drawings.

However, heat networks are almost always across areas of dense

services.

Significant volume of unknown/redundant buried services.

Aged utilities (cast iron water mains).

Non-Compliant with CDM regs 2015/ BIM II

Typically all-risk contracts (depth/welds/services).

Minimal due-diligence and planning prior to excavation.

Significant volume of mitred welds to overcome buried services.

Contractor undertakes their own QA of the installation.

As-built drawings are often incomplete.

3D TECHNICAL DESIGN

BEST PRACTICE GUIDES

CIBSE – BEST PRACTICE

HEAT NETWORK CODE OF PRACTICE

Best Practice includes obtaining and reviewing drawings of the existing

utilities and other record information in the area covered by the heat

network.

Determine additional barriers e.g. no space underneath certain roads due to

congestion of other utilities or opportunities e.g. the use of existing service tunnels,

basements etc.

This could be supplemented by undertaking ground penetrating radar

surveys to map existing services at critical points.

NETWORK DESIGN STAGE 1

FEASIBILITY SUPPORT

Heat Mapping & Energy Masterplan.

Identify Generation Source and Consumers

Route Option Appraisal.

OS Map,

Utility Drawings,

Desk Top Study

Identify Consents Required

Network Length

Risk Matrix Preferred Route Identified & Agreed with

Consultant and Client

GA with Utility Overlay

Early Cost Estimates

High Risk/Cost

Input from

Consultants

Output to

Stage 2

GA – ROUTE OPTIONS

• Starts from Energy

Masterplanning.

• Map Building Connections.

• Identify options and strategy

based on land rights

(highways/Public/Private Land).

• Assess Linear Route

Differences.

• Identify and measure alternative

routes.

C2 - UTILITY OVERLAY

• Overlay of all C2 (Utility Drawings)

• Inc. Gas, Elec, Water, Drainage, Data etc.

• Establishes Service Density to informs

route options

Highlights risks and observations such as:

• Age/likely condition on Asset.

• Nature of Asset (MDPE/Cast Iron)

• Size of Installation (11kv/ 33kv)

• Density of Chambers

• Significant density

ANNOTATED HISTORICAL

- OS MAP OVERLAYS.

Typically every 30 years, from

~1850 onwards

Identifies Legacy:

• Train/Tram

• Church/Burial

• Land use

• Structures

• Infilled Subways

• Industrial Contamination

• Historical Street Layout

• Canals

• Utility Infrastructure

TECHNICAL HAZID AND

COMMERCIAL RISK REGISTERS

PRIORITY ZONES/ANNOTATED

DIMENSIONED ROUTES

ANNOTATED – CONCEPT DESIGNS FOR

MAJOR INFRASTRUCTURE CROSSINGS

• Rivers/Canal

• Bridges

• Rail/Tram

• Complex Junctions

• Roundabouts

• Motorways

• Interface close to protected

assets

TYPICAL LAYOUT DRAWINGS


DESIGN DEVELOPMENT

Preferred Route

GA with Utility Overlay

GPR and Network Development.

GPR Drawing/Survey

GPR Modelling

Dimensioned route

Refined Expansion Strategy

Weld Positions

Approval to Commence 3D Design Modelling

GA of Detailed Network Route

Revised Cost Estimates and schedule of rates.

Risks can be minimized further

Input from

Stage 1

Output to

Stage 3

UTILITY DETECTION – GPR/EML

RED LINE DRAWING

• PAS 128

• Grid Size

reflective of

environment

• Topographical

Survey Area

REVISED NETWORK ROUTE AND WELD

POSITIONS

DETAILED GA –

GPR AND TOPOGRAPHICAL SURVEY

• Weld Positions

• Chambers

• Alignment with

highways, trees,

structures.

• Accurate Trial

Hole Identification

• Coordinated and

informed decision

making


3D MODEL AND CONSTRUCTION DRAWINGS

Detailed Route

GA of Detailed Route

GPR Model

Technical Consents Identified

3D Design and Modelling

Model Network Through Services

Finalise Expansion Strategy

Construction Drawings

Technical Submissions for Consents

Project Ready for Tender, Phasing and Programming

Tender pack with all construction drawings.

Accurate phasing.

Consents secured.

Programme Agreed.

Risks Managed and reflected in Contractor Pricing

Input from

Stage 2

Output to

Construction

3D MODELLING EXAMPLES

CONSTRUCTION DRAWING EXAMPLE

CONSTRUCTION HAZID

• Evolves from Feasibility

Phase HAZID.

• Design Led.

• Project Specific.

• Developed throughout

the Design Process.

• Compliance with CDM

2015.

DETAILED DESIGN PLANNING

KEY BENEFITS OF DETAILED

UPFRONT 3D NETWORK DESIGN

Engineering and Contracting Best-Practice

Client (Often Local Authority): Reduced Network Costs and Programme.

Therefore - Scheme and connection viability improves.

Improved Operational Life - Reduced stresses and mitres.

QA measures in place for Contractor Performance.

Consultants: Complements existing skills in Heat Mapping, Energy Masterplanning

and Feasibility.

Improved assurance to clients.

Contractors. Quality-led approach thrives.

Reduced risk.

Improved Temporary Works and Safe Material Handling.

Improved planning, programming and phasing.

Policy/Society HNDU delivers against its core objectives.

INSTALLATION COST COMPARISON STUDY

POLYMER VS STEEL


POLYMER VS STEEL - SCOPE

Review/ Budget analysis - Between the installation costs/factors of

equivalent Polymer and Steel system designs.

It is highlighted that this is was a high level initial study, where further investigations and

limitations have been advised.

• Purpose - Stimulate

understanding/dialogue within

an area with little existing

evidence.

• 3D-TD produced an equivalent

Steel design to Polymer.

• Based on a recent Project

connecting 120 dwellings.

• Assess costs of:

• Excavation

• Jointing

• Prelims

• Installation

• Commissioning


POLYMER VS STEEL

• Steel Design Criteria:

• Accommodated Expansion.

• Used Curves/Straight Pipes on Spine and

Localised Spine.

• Offered Building Connections in both rigid and

flexible steel.

• Jointing Criteria

• Compression fittings for Polymer

• Class 1 weld/Fusion Sleeves for Steel main

• Trench Criteria

• Calculated by reference to pipe manufacturer’s

typical trench detail.

• Provision for Jointing Pits.


KEY FINANCIAL FINDINGS:

Cost Type Polymer Cost Steel/Aluminium Cost Variance

Jointing / welding costs 30,870.00£ 226,311.00£ 195,441.00£

Civils (Fencing, Excavation and re-instatement) 204,009.47£ 238,022.25£ 34,012.78£

Prelims (Compound, Welfare, Site Management) 60,000.00£ 77,000.00£ 17,000.00£

Pipe laying costs 10,808.00£ 15,655.63£ 4,847.63£

Testing and commissioning costs 11,814.90£ 11,892.92£ 78.02£

Key Variance Analysis

• Jointing

• Significant difference between Polymer and Rigid Steel

• Strong conclusion of the study

• Civils

• Marginal increased costs for Steel Design

• Jointing Pits

• Prelims

• Increased project length due to welding/sleeving

• Larger Compound required for pipe storage.

THANK YOU FOR LISTENING

ANY QUESTIONS

Always in Partnership

Contact Details

Craig Grobety

Phone: (UK) 07825 108940

e-mail: [email protected]

mailto:[email protected]

3d technical design td - rehau · 3d technical design - summary • uk based specialist heat...

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