TESTING AND VERIFICATION OF GAS PROTECTION SYSTEMS [CIRIA ...CIRIA_C735]_Hugh_Mallet.pdf · Guidance on membranes as VOC barriers [CIRIA C748] Testing and verification of gas protection
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S Y S T E M S [ C I R I A C 7 3 5 ]
July 2015
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Guidance on membranes as VOC barriers [CIRIA C748]
Testing and verification of gas protection systems [CIRIA C735]
1. The Project
2. Project Issues
3. Verification Procedure
4. Integrity testing
5. Reporting
6. Recommendations
Case study
Conclusions
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S . O U T L I N E O F P R E S E N TAT I O N
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G U I DA N C E O N M E M B R A N E S A S V O C B A R R I E R S [ C I R I A C 7 4 8 ]
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G U I DA N C E O N M E M B R A N E S A S V O C B A R R I E R S [ C I R I A C 7 4 8 ]
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G U I DA N C E O N M E M B R A N E S A S V O C B A R R I E R S [ C I R I A C 7 4 8 ]
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G U I DA N C E O N M E M B R A N E S A S V O C B A R R I E R S [ C I R I A C 7 4 8 ]
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S Y S T E M S [ C I R I A C 7 3 5 ]
October 2014
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Cover slide 1: White (no picture) Use cover slide 1 to start a presentation (or cover slide 2 with an image, if appropriate) Title and date must appear in ‘Brown, Accent 1’ from the colour pallet, in caps, using Segoe UI Semibold at 18pt and 14pt respectively Keep title to a maximum of three lines. Text box can be extended, but must always be centred on the slide NB – there are additional slide master layouts available to those demonstrated in this guidance presentation – use drop down menu under new slide button to see full selection
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S C 7 3 5 P R E S E N TAT I O N S T R U C T U R E
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Need Installed gas protection systems often inadequate Verification - fundamental to remediation Little current guidance for verification of gas protection systems Verification absent in design/ construction of buildings with gas protection systems Membrane resilience and integrity and well designed venting systems fundamental
to performance of gas protection systems
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S C 7 3 5 1 . T H E P R O J E C T
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 1 . T H E P R O J E C T
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 1 . T H E P R O J E C T
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 1 . T H E P R O J E C T
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Team CIRIA - J Kwan PSG Chair - G Card (GB Card) - L Cox neeTaffel -Andureau (Buro Happold/Arup) Research - M Corban (MEC Environmental) Contractor - H Mallett (Buro Happold) - S Wilson (EPG) PSG - 27 members from: NHBC LA & EA regulators contractors consultant suppliers
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 1 . T H E P R O J E C T
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3. Describe integrity test methods and their selection
4. Identify practical constraints
5. Set out details of Verification Report [ CLR11 and SC030114]
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 1 . T H E P R O J E C T
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Part 2A [Statutory guidance] Any remedial treatment action should include appropriate verification measures. In arranging for such measures, the enforcing authority should ensure that the person responsible for verification is a suitably qualified experienced practitioner. (Defra, 2012)
NPPF Responsibility rests with developer Competent person
CLG 2008 [Standard Conditions] “Following completion of measures identified in the approved remediation scheme, a verification report (referred to in PPS23 as a validation report) that demonstrates the effectiveness of the remediation carried out must be produced, and is subject to the approval in writing of the Local Planning Authority”.
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 1 . T H E P R O J E C T
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NHBC [Chapter 4.1] Robust design and verification required [Cl D6 and D7] Specialist membrane installers [CSC – National Occupational Standards VR612,613; NVQ level 2 Diploma – Installation of gas membranes] “Suitable person” to prepare Verification Reports [Appendix 4.1D] Verification required on “higher risk” sites (Amber 2 and above)
CIRIA [C735] The role and responsibilities of the local authority as primary regulator of land contamination, including land affected by ground gas emissions, is important for their assessment and approval of both the developers’ initial planning proposals (including remedial strategy) and the post development verification report
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 1 . T H E P R O J E C T
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 2 . P R O J E C T I S S U E S
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1. Verification – “currently insufficient attention in design of gas protection systems”
A Verification Plan should be prepared as an integral part of the gas protection system at the design stage and submitted to the local authority regulator as an integral part of the remediation strategy. The verification plan should address
i. Gas regime and gas protection system
ii. Inspection regime
iii. Integrity test programme (if any)
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 2 . P R O J E C T I S S U E S
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“Ventilation is a very effective first line of defence in gas protection systems”.
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 2 . P R O J E C T I S S U E S
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3. Integrity of membranes BRE – Minimum 1200g polyethylene Intact survival during construction.
CIRIA C735
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 2 . P R O J E C T I S S U E S
Critical property – ability to survive construction intact. Key parameters – material type; tensile strength, puncture resistance; permeability; need for protection; thickness (if welded).
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4. Robustness and levels of redundancy Increase with Characteristics Situation [Basis of approach in Wilson&Card 99, CIRIA C665, British Standard 8485, NHBC 2007].
5. Conceptual site model An appropriate understanding of the conceptual site model is a critical element in the verification process
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 2 . P R O J E C T I S S U E S
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Verification by competent experienced trained personnel.
Third party verification
Risk based approach to verification activities.
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 3 . V E R I F I C AT I O N P R O C E D U R E S
Verifying that a gas protection system works is as important as design and installation.
A Verification Plan should be prepared as an integral part of the gas protection system at the design stage and submitted to the local authority regulator as an integral part of the remediation strategy.
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Risk based approach to verification and independence
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 3 . V E R I F I C AT I O N P R O C E D U R E S
Requirement for 3rd party verification increases with risk.
Environment Agency recommends avoidance of conflicts of interest in verification [independent verifier]
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 3 . V E R I F I C AT I O N P R O C E D U R E S
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Appropriately experienced & qualified workforce install gas protection system
If not more intensive verification required
Relevant qualification – CSC level 2 NVQ Diploma in sub structure work occupations (Construction) – installation of gas membranes.
Qualification helps ensure work complies with National Occupational Standards V612, V613.
A qualified workforce helps ensure adequate gas membrane installation and can make provision for less onerous verification plans.
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 3 . V E R I F I C AT I O N P R O C E D U R E S
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Not – Substitute for well designed/ installed gas protection systems
Not – to be used to obtain BS 8485 points
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 4 . I N T E G R I T Y T E S T I N G
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b) Areal - Tracer gas - Smoke - Dielectric porosity
All have advantage and limitations.
Risk based decision on need
Planned
Practical application/ limitation.
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 4 . I N T E G R I T Y T E S T I N G
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 4 . I N T E G R I T Y T E S T I N G - M E T H O D S
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 4 . I N T E G R I T Y T E S T I N G - M E T H O D S
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 4 . I N T E G R I T Y T E S T I N G
Annex 1 Risk based structure for verification and integrity testing Considers; • Development type • Gas regime • Slab type • Installer experience Provides • Level of verification • Type of integrity testing Read the explanatory Notes
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 5 . R E P O RT I N G
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1. Recognition of CLO role and responsibility 2. Use of Conditions to require verification 3. Reject unsuitable reports 4. Upskill workforce [CSC - competent person] 5. Installers have / working towards NVQ 6. Verification plan – integral element of strategy
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 6 . R E C O M M E N DAT I O N S
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7. Recognition of independent verification as important element 8. Risk based decision on verification (independence, gas regime, gas protection
system, quality of product, installer competence) 9. Verifier – independent, competent, experienced 10. Proprietary gas membrane should be specified [material type, tensile strength,
puncture resistance, permeability, thickness (welded) & protected] 11. Research into integrity test methods 12. Use of standard inspection pro formas
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S 6 . R E C O M M E N DAT I O N S
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T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S C A S E S T U D Y
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Presentation Notes
Text slide Three text slide layout options available Slide heading must be black, in caps, using Segoe UI Semibold Body text should be black and left aligned, using Segoe UI (regular) at 16pt Use the bullet points and line spacing preformatted within text box, ensure style and text indentation remains consistent throughout presentation To turn bullet points on and off, click inside text box before adding text (or highlight existing text), then click bullets button in paragraph tool bar on home tab NB – there are additional slide master layouts available to those demonstrated in this guidance presentation – use drop down menu under new slide button to see full selection
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S C A S E S T U D Y
Presenter
Presentation Notes
Text slide Three text slide layout options available Slide heading must be black, in caps, using Segoe UI Semibold Body text should be black and left aligned, using Segoe UI (regular) at 16pt Use the bullet points and line spacing preformatted within text box, ensure style and text indentation remains consistent throughout presentation To turn bullet points on and off, click inside text box before adding text (or highlight existing text), then click bullets button in paragraph tool bar on home tab NB – there are additional slide master layouts available to those demonstrated in this guidance presentation – use drop down menu under new slide button to see full selection
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S C A S E S T U D Y
Presenter
Presentation Notes
Text slide Three text slide layout options available Slide heading must be black, in caps, using Segoe UI Semibold Body text should be black and left aligned, using Segoe UI (regular) at 16pt Use the bullet points and line spacing preformatted within text box, ensure style and text indentation remains consistent throughout presentation To turn bullet points on and off, click inside text box before adding text (or highlight existing text), then click bullets button in paragraph tool bar on home tab NB – there are additional slide master layouts available to those demonstrated in this guidance presentation – use drop down menu under new slide button to see full selection
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S C A S E S T U D Y
Presenter
Presentation Notes
Text slide Three text slide layout options available Slide heading must be black, in caps, using Segoe UI Semibold Body text should be black and left aligned, using Segoe UI (regular) at 16pt Use the bullet points and line spacing preformatted within text box, ensure style and text indentation remains consistent throughout presentation To turn bullet points on and off, click inside text box before adding text (or highlight existing text), then click bullets button in paragraph tool bar on home tab NB – there are additional slide master layouts available to those demonstrated in this guidance presentation – use drop down menu under new slide button to see full selection
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S C A S E S T U D Y
Presenter
Presentation Notes
Text slide Three text slide layout options available Slide heading must be black, in caps, using Segoe UI Semibold Body text should be black and left aligned, using Segoe UI (regular) at 16pt Use the bullet points and line spacing preformatted within text box, ensure style and text indentation remains consistent throughout presentation To turn bullet points on and off, click inside text box before adding text (or highlight existing text), then click bullets button in paragraph tool bar on home tab NB – there are additional slide master layouts available to those demonstrated in this guidance presentation – use drop down menu under new slide button to see full selection
3. Devise solution [in conjunction with specialist & contractor]
4. Implement and
5. Verify and record
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S C A S E S T U D Y
Presenter
Presentation Notes
Text slide Three text slide layout options available Slide heading must be black, in caps, using Segoe UI Semibold Body text should be black and left aligned, using Segoe UI (regular) at 16pt Use the bullet points and line spacing preformatted within text box, ensure style and text indentation remains consistent throughout presentation To turn bullet points on and off, click inside text box before adding text (or highlight existing text), then click bullets button in paragraph tool bar on home tab NB – there are additional slide master layouts available to those demonstrated in this guidance presentation – use drop down menu under new slide button to see full selection
7. Risk based approach to verification [activities, type, frequency, competence]
T E S T I N G A N D V E R I F I C AT I O N O F G A S P R OT E C T I O N S YS T E M S C O N C LU S I O N S
Presenter
Presentation Notes
Text slide Three text slide layout options available Slide heading must be black, in caps, using Segoe UI Semibold Body text should be black and left aligned, using Segoe UI (regular) at 16pt Use the bullet points and line spacing preformatted within text box, ensure style and text indentation remains consistent throughout presentation To turn bullet points on and off, click inside text box before adding text (or highlight existing text), then click bullets button in paragraph tool bar on home tab NB – there are additional slide master layouts available to those demonstrated in this guidance presentation – use drop down menu under new slide button to see full selection
Sample end slide Use end slide layout as final slide for all external presentations Logo hyperlinked to BuroHappold website NB – there are additional slide master layouts available to those demonstrated in this guidance presentation – use drop down menu under new slide button to see full selection
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