Balbriggan-Skerries WWT Scheme - Method Statement - SBR 2 Membrane Head Replacement

Sep 11, 2026

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Method statement for balancing operations and safety during membrane head replacement for SBR 2 at the Balbriggan-Skerries WWT Scheme. Covers preparation and controlled isolation of SBR 2 from incoming flow, drain down sequence, electrical isolation using Lock-Out Tag-Out, and management of confined space entry conditions. Includes handover for removal of residual liquid and solid waste, power washing requirements, scaffold access/egress provisions, and step-by-step removal of existing diffusers and installation workflow. Prepared for internal review, signing, and client acceptance.

LanguageEnglish

CategoryLetters

FormatPDF

Pages8

Reading Time3 min

AccessFree to download

Contents

1 Introduction – Scope of Works

2 Pre-commencement Requirements

3 Resources – Materials, Plant and Labour

4 Methodology

5 Programme

6 Quality

7 Safety

8 Environmental

9 Appendices

9.1 Appendix A-Safety Risk Assessment

9.2 Appendix B-Site Layout

9.3 Appendix C-JC Enviro Method Staement & Risk Assessment

9.4 Appendix D-Scaffold Elevation Method Staement & Risk Assessment

| LINK TO PROCEDURE & PROCESS MAP | | | --- | --- | | Preparation & Issue of Method Statements Procedure | Preparation & Issue of Method Statements Process Map | | CLIENT | Irish Water | | --- | --- | | CONTRACT TITLE | Balbriggan-Skerries WWT Scheme | | CONTRACT NUMBER | 5015020000 | | OPERATING UNIT | M6 | | METHOD STATEMENT | | --- | | BALBRIGGAN-SKERRIES WWTS
SBR 2 MEMBRANE HEAD REPLACEMENT | | | | | | | --- | --- | --- | --- | | Owen Sheill
Plant Manager | Charlotte Maguire
SHESQ Advisor | Pat Phibbs
Operations Manager | Client Name
Client Job Title | | AUTHOR | REVIEWER | APPROVER | ACCEPTED BY CLIENT (if applicable) | | DOCUMENT No. | | | Click here to enter text. | | | --- | --- | --- | --- | --- | | | | | | | | CURRENT REVISION | | | CURRENT STATUS CODE | SECURITY CLASSIFICATION | | P01 | | | D2 | Internal | | | | | | | | REVISION HISTORY | | | | | | REVISION | STATUS CODE | DATE | REVISION DESCRIPTION | | | P01 | D2 | 11/11/19 | Issued for review | | | C01 | A1 | | Issued for signing | | | | | | | | | | | | | | --- | --- | --- | --- | Controlled Copy Distribution List EDIT THIS TABLE TO MATCH THE ACTUAL PROJECT TEAM – MAKE SURE YOU INCLUDE ALL KEY MANAGEMENT/ SUPERVISORS AS THEY WILL BRIEF THE REQUIREMENTS TO OTHERS E.G. OPERATIVES WHO HAVE RESPONSIBILITIES UNDER THIS METHOD STATEMENT | CONTROLLED
COPY NO. | JOB TITLE | | --- | --- | | 01 | Operations Manager | | 02 | Safety Advisor | | 03 | Site Copy – Plant Manager | | 04 | | | 05 | | | 06 | | | 07 | | | 08 | | | 09 | | | 10 | | | 11 | | Contents 1 Introduction – Scope of Works 4 1.1 The Project 4 1.2 The Works 4 1.3 Reference Documents 5 2 Pre-commencement Requirements 5 3 Resources – Materials, Plant and Labour 5 3.1 Materials 5 3.2 Plant 6 3.3 Personnel and Labour 6 4 Methodology 6 5 Programme 7 6 Quality 7 7 Safety 7 8 Environmental 8 9 Appendices 8 9.1 Appendix A-Safety Risk Assessment 8 9.2 Appendix B-Site Layout 8 9.3 Appendix C-JC Enviro Method Staement & Risk Assessment 8 9.4 Appendix D-Scaffold Elevation Method Staement & Risk Assessment 8 1 Introduction – Scope of Works 1.1 The Project Balbriggan-Skerries WWT Scheme consists of a 70,000 PE WWTP at Barnageeragh with pumping stations at Rush Road in Skerries and Hampton Cove in Balbriggan. The WWTP at Barnageeragh is a Sequencing Batch Reactor (SBR) plant. There are four SBRs that were built in two phases. 1.2 The Works 1.2.1 Isolation of SBR 2 and drain down – works due to take place w/c 18th November 2019 ◼ In order to drain SBR 2 this area will need to be isolated from incoming flow by Murphy Process Engineering (MPE) .This will be achieved by: ◼ Manually close SBR 2 Inlet Penstock by local control which is located at the Splitter Chamber. ◼ Manually operate sludge wasting pump, labelled as SAS Pump 2 to reduce mlss level in SBR 2. ◼ An external diesel powered pump will be located at ground level, adjacent to the south east corner of SBR 2. This will be available for pumping mixed liquor and SBR effluent back to Splitter Chamber during SBR draining. Mixed liquor/Effluent that has been returned to Splitter Chamber will gravitate to remaining SBRs. ◼ SBR draining from approximately 3.25m Bottom Water Level (BWL) to approximately 1m water level will not involve Confined Space Entry. ◼ Aeration is used in accordance with the SBR sequence during this period to maintain aerobic conditions and reduce risk of odour emissions. ◼ Once the SBR has been isolated from incoming wastewater the drain down exercise may take 1 to 2 days. ◼ When the desired levels have been reached, the SBR equipment must be electrically isolated in accordance with MPE Lock-Out Tag-Out (LOTO) procedure. Inlet Penstock, Air Main Actuated Valve, Return Sludge Pump (RAS Pump), SAS Pump and Effluent Decanter are to be isolated before Confined Space Entry. 1.2.2 Handover prior to SBR entry f

FAQs

What is the scope of works for SBR 2 under this method statement?

The works include isolating SBR 2, draining down, power washing after waste removal, and replacing the membrane/diffusers with scaffold-based access and controlled installation steps.

How is SBR 2 isolated before drain down and maintenance activities?

Isolation is achieved by manually closing the SBR 2 inlet penstock, operating sludge wasting pump SAS Pump 2 to reduce MLSS level, and using an external diesel pump to return mixed liquor/effluent to the splitter chamber.

When is electrical isolation and confined space control required?

After isolation from incoming wastewater and when target levels are reached, the SBR equipment must be electrically isolated according to MPE Lock-Out Tag-Out. Inlet penstock, air main actuated valve, RAS pump, SAS pump, and effluent decanter are to be isolated before confined space entry.

Sep 11, 2026

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