Design and Construction Standards

Information SessionMarch/April 2018

Agenda

• Context• Where are at, what we are trying to do• Hierarchy of the new Icon Water Standards• Asset creation and acceptance• WSAA codes• Safe access, egress and working at heights• Approved Products List• Drafting standards• WAE records, surveying and tolerancing

Context• Population growth (5,000 to

6,000 per annum)• Lowest construction safety

scorecard in Australia• Renewals and urban infill

becoming a larger issue• Smaller leases, roads and public

areas• Gifted (new) assets in the

suburbs• Pump stations• Reservoirs• Detention tanks• “Best For Region” STP or ???

Context

Construction Safety

Urban Infill Development

The existing situation…

Existing WSSS Standards

Total Content:300 pages of text approx.40 standard drawingsOnly covers water supply and sewerage network assets

Island mentality?

What are we trying to do?

Harmonise

Benefit from collective knowledge

“Raise the bar” on design/construction outcomesWSAA Design Assurance Scheme• Improve designer competency• Set a minimum standard• Encourage a national approach• Ensure portability of competencies• Retain knowledge • Develop competencies

Who is WSAA and what are WSA codes?

Publications Industry Contact

Flowchart of where WSAA publications (should) apply…

BW PumpStations

WTP

Bulk Supply Pipelines

Bulk Supply Pipelines

Dams

Reservoirs

Water Network(includingPump Stations)

Mains-toMeter

Indicates WSA-03 applies

Indicates WSA 201 applies

Indicates WSA PS apply

Flowchart of where WSAA publications (should) apply…

SewerNetworks

SPS

Sewer Ties

STP

Discharge

Indicates WSA-02 applies

Indicates WSA 201 applies

Indicates WSA PS apply

Indicates WSA-04 applies

From 1 July 2018…

• Asset Creation and Approval Process• Supplement to WSA-02 Sewerage & WSA-03 Water Supply• Supplement to WSA-04 Sewage Pumping Stations• Supplement to WSA 201 Surface Coatings• Customised WSA Product Specifications

• Service and Installation Rules• Drafting Standards and Other Specifications• Approved Products List

The Proposed Situation For Network Assets…

Total Content:1400 pages of text (up from 300 pages right now)160 standard drawings (up from 40 right now)

The Proposed Situation for Facilities…• Mechanical Specification Set (95% complete)• Piping and Valves Specification Set (80% complete)• Civil and Structural Specification Set (85% complete)• Documentation and Training Specification Set (85% complete)• Surface Coatings Supplement to WSA 201 (100 complete)• EI & C Specification Set (100 % complete)• Safe Access, Egress and Working at Heights (100 % complete)• Approved Products List (100 % complete but ongoing)• Drafting Standards (85% complete)• Surveying and Tolerancing (80% complete)• Standard Drawings - 60 approx. (25% complete)

A focus on networks and WSAA codes…

+ Icon Water supplementSTD-SPE-G-012

+ Icon Water supplementSTD-SPE-G-010

+ Icon Water supplementSTD-SPE-G-011

STD-SPE-G-019 Asset Creation & Approval Process

Plus…• Drafting Standard• Survey and Tolerancing Standard• “SD series” drawings (160 approx.)

Revision in progress

WebsiteThe plan is to follow the lead of SA Water…

A Focus on Standard Drawings

DRAWING No.

DRAWING TITLE

1100 SERIES DRAFTING SYMBOLS AND NOMENCLATURE1200 SERIES PROCESS 1300 SERIES SIGNAGE, LABELS, PLACARDS, MARKERS2000 SERIES SEWERAGE NETWORK - PIPELINE LAYOUT2100 SERIES SEWERAGE NETWORK - EMBEDMENT AND TRENCHFILL2200 SERIES SEWERAGE NETWORK - BELOW GROUND MAINTENANCE POINTS & STRUCTURES

2300 SERIES SEWERAGE NETWORK - ODOUR & VENTILATION3000 SERIES WATER NETWORK - PIPELINE LAYOUT3100 SERIES WATER NETWORK - EMBEDMENT AND TRENCHFILL3200 SERIES WATER NETWORK - INSTALLATION PRACTICES AND STRUCTURES3300 SERIES WATER NETWORK - WATER SERVICE CONNECTIONS4100 SERIES SEWAGE PUMPING STATIONS AND PRESSURE MAINS5000 SERIES BURIED AND ABOVE-GROUND PIPELINES - TYPICAL DETAILS5200 SERIES BURIED PIPELINES - INSERTION AND REPAIR METHODS5300 SERIES PIPING DETAILS - PIPE SUPPORTS AND OTHER STANDARD PIPING DETAILS5500 SERIES VALVE & FLOWMETER INSTALLATIONS - ABOVE GROUND5700 SERIES VALVE AND FLOWMETER INSTALLATONS - BELOW GROUND6000 SERIES TANKS AND VESSELS7000 SERIES CHEMICAL STORAGE, HANDLING AND DOSING8000 SERIES LADDERS, STAIRS & ASSOCIATED COVERS ARRANGEMENTS AND INSTALLATION DETAILS8100 SERIES LADDERS, STAIRS & STEP IRONS8200 SERIES ACCESS HATCHES AND COVERS8400 SERIES FALL PREVENTION - DAVITS, ANCHOR POINTS AND GUARDRAILING9000 SERIES SITE SECURITY AND ACCESS - FENCING, GATES, BOLLARDS AND BARRIERS9100 SERIES STEELWORK & ALUMINIUM WORK - MISCELLANEOUS9300 SERIES EARTH & CONCRETE WORKS - MISCELLANEOUS

1 9400 SERIES MECHANICAL & PIPING - MISCELLANEOUS

WSA 02

WSA 03

WSA 04

AS 1100

Concept versus Detailed Design

Asset Area Applicability

Example Drawings

We have made some errors

We have not aimed for perfection. We have tried toBe pragmatic.

We have drafted our standards primarily using“in-house” resources.

We are open to feedback and suggestions.

A Focus on Specifications

Access, Egress and Height Safety

SpanSet (Xtirpa) Manhole Guards

Manhole Guards and Standard Hatch Designs

Manhole Guards and Standard Hatch Designs

Hazardous Manual Tasks

Limited Free Fall Arrest Equipment

Only a Type 3 SRL which limits the maximum arrest force to 4 kN and maximum arrest distance to 600 mm is approved for use. Refer to the new Approved Products List. This is more stringent than the Australian Standard (AS/NZS 1891.4) which allows a 6 kN maximum arrest force.

Preference Order

1A. Fixed Davit Base (for treatment plants and SPS wet wells only) otherwise…

1B. Portable davit solution (e.g. hitch-mounted, manhole guard or H-base)

2. Tripod or “Arachnipod” etc.

3A. Fixed Davit Base – Cored-In3B. Fixed Davit Base – Flush Mount3C. Fixed Davit Base – Bolt Through3D. Fixed Davit Base – Bolt-In

4. Clamp-On Davits (only to be used at certified locations)

Limited Free Fall Arrest Equipment

Clamp-on davit bases can only be installed at a location previously certified by a Structural Engineer. The location should be treated in the same way as a permanent davit base (i.e. a certification plate is installed).

Reliance on Portable Ladders

Buried Maintenance Structures – The Use of Step-Irons (and Single Stile Ladders)

Step irons must be staggered and not plastic encapsulated – refer to the Icon Water SD Series of drawings

Slips and TripsPublic Footpaths: No protrusions allowed for access hatches and covers etc.

Slips and TripsWalkways: “Flush-Fit” access hatches and covers (i.e. 5 mm protrusions allowed above vertical or bevelled/rounded edges).

Otherwise: Access hatches and covers can have exposed handles, hinges and locks etc., as they are not in an area where they will be used for pedestrian access.

Slips and Trips

Ladders and Access Hatches

Ladders shall have an even rung/tread spacing and the chance for an uneven step should be eliminated.

Maintenance holes with DN600 openings are the only exception.

Ladders and Access Hatches

1. All stanchions to be fixed (ideally) or pull-up. Removable stanchions are not allowed.

2. All access hatches to be hinged unless not practicable. All other covers to be fixed.

3. Gas-struts not allowed for assisted hatch lifting. Torsion springs are allowed.

4. Access hatches to open to 95 degrees. Otherwise they shall be “fold-flat” if low headroom in a pit.

5. Hatches to be sized for SpanSet manhole guards and AS 1657 requirements. Note: SD Series drawings already show standard sizes.

Torsion-Spring AssistedAccess Hatch

Standard Detail – Vertical Rung Ladder With Pull-Up Stanchions

Ladders and Access Hatches

Supplement to AS 1657: Guardrailing Not Required…

Supplement to AS 1657: Ladder Rules and Preferences (Excluding Sewer MHs)

1. Vertical rung ladders – no fall arrest required for fall potential ≤ 3.0 metres2. Inclined step and rung ladders are the default unless the vertical height is ≤ 2.0 metres3. Ladder selection is based on frequency of use4. Step-irons are not allowed (except in DN1050 sewer MHs)5. Single-stile ladders are not allowed6. Fixed stanchions at top landing are preferred otherwise pull-up stanchions. Removable are not allowed.7. Top rung/step to be integrated with access hatch wherever practicable to avoid a misstep.8. Bottom of ladder landing can be benched up to 6 degrees, otherwise alternative measures required.9. All other details as per AS 1657

Don’t get confined space rescue requirements mixed up with working at heights requirements (i.e. a Type 3 SRL and harness may be required regardless of fall potential as part of a confined space rescue plan).

Where can you find our standards?

The Approved Products List

Approved Products List – Key Points• Trying to give at least 3 options per product

type/family to avoid “monopoly supply” (except SPS pumps)

• Just because another urban water agency has approved a product doesn’t mean Icon Water will. We have our own constraints.

• Just because a product has a WSAA appraisal does not mean that we will approve the product.

• We are aiming at approving in batches – 3 times per year.

• Project specific approvals are not a precedent.• Non-approved products shall not be used.

Approved Products List – Polyethylene• Special approval required for anything other

than mains-to-meter applications ≤ DN63.• Potential reasons for use: Trenchless

construction, curved pipeline alignments, mains renewals.

• We are looking at a “blanket” approval late 2018 (once repair options have been locked in).

Property Service Connections(Sewer ties and mains-to-meter)

Dedicated Specification for Plumbers (STD-SPE-M-006)• No need for plumbers to

purchase WSAA codes if they are only installing meters and consumer plumbing outside Icon Water’s limit of responsibility.

• This specification is a distillation of WSA 02 and WSA 03 requirements as amended by Icon Water in STD-SPE-G-011 and G-012.

Dedicated Specification for Plumbers (STD-SPE-M-006)• We now allow above-ground

meter enclosures.• We now allow PRVs and back-

flow prevention to be installed in enclosures and pits downstream of the Icon Water limit of responsibility (subject to certain conditions).

• Above-ground enclosures must be fully enclosed and insulated.

• No longer a need to allow for future fire flow metering.

Dedicated Specification for Plumbers (STD-SPE-M-006)

Trenching (Bedding and Backfill)

• 100% adoption of WSAA requirements

WAE, Survey and TolerancingProposed adoption of SA Water requirements1. Registered Surveyor checks as constructed

works (during and at end)2. Registered Surveyor certifies the drawings if

“in tolerance”.3. Superintendent and Icon Water notified if

“out of tolerance”.4. Authorised Consultant may certify on behalf

of the Registered Surveyor (under certain conditions).

5. Using AS 5488 Classification of Subsurface Utility Information (SUI) as a basis for survey tolerances and accuracy required for different asset types.

Drafting Requirements• It is clear our current drafting

standard is not suitable for gifted assets.

• We have taken feedback from the last 18 months on board.

• A new drafting standard is being developed.

• We will be making available standard blocks and line-types in native (ACAD) format.

A Focus on WSA 02 and WSA 03

WSA 02 Gravity Sewerage Code of AustraliaIcon Water Differences (as per supplement STD-SPE-G-011)1. Flow estimation (ADWF, PWWF etc.)2. Minimum sewer grades3. Additional Approval: Polyethylene and GRP4. Colour coding5. Corrosion protection (DICL pipes, HDG bolting)6. Maintenance structures (no MCs, sizing, height safety etc.)7. Location (easements, zone of influence)8. Clearances (as agreed with TCCS)9. WAE records (based on SA Water standards)10. Surveying and tolerancing (based on SA Water standards)

WSA 03 Water Supply Code of AustraliaIcon Water Differences (as per Supplement STD-SPE-G-012)1. Network Basis of Design (flow estimation including fire flow requirements)2. Higher allowable service pressures 3. Tighter requirements for stop valve spacing4. Reliance on a reservoir based system (explicitly stated)5. Additional Approval: Polyethylene and GRP6. Corrosion protection (DICL pipes, HDG bolting)7. Maintenance structures (sizing and height safety etc.)8. Location (easements, zone of influence)9. Clearances (as agreed with TCCS)10. WAE records (based on SA Water standards)11. Surveying and tolerancing (based on SA Water standards)