Table of Contents
1. The Scope of Work Method Statement
2. The Purpose of Work Method Statement
3. Abbreviations
4. Reference & Related Standards
5. Health & Safety Requirements
6. Installation Sequence for Drainage Accessories
7. Installation of Parking Drains
8. Connection Methods
9. Checking the Slope of the Drainage Pipe
10. Inspection Checklist for Drainage Accessories Installation Testing and Commissioning
11. Attachments
1. The Scope of Work Method Statement
Below is a precise method of statement that describes the procedure for the installation of Drainage Accessories.
2. The Purpose of Work Method Statement
2.1. This document defines the methods to be used to ensure that the plumbing works to be conducted at the site follow the approved designs and approved material submittals.
2.2. Before the installation of drainage accessories, the supervisor and foreman will verify and ensure that all the health and safety requirements have been complied with.
2.3. The supervisor will verify that all relevant approved latest revisions of shop drawings, technical submittals, inspection, and test plans are in the workplace for installation reference including the installation procedures.
3. Abbreviations
3.1. SWMS: Safe Work Method Statement
3.2. IDA: Installation of Drainage Accessories
3.3. SD: Shop Drawings
3.4. TS: Technical Submittals
3.5. ITP: Inspection, and Test Plans
3.6. IP: Installation Procedures
3.7. BMS: Building Management System
3.8. HS: Health and Safety
4. Reference & Related Standards
4.1. Project Quality Plan / Commissioning Plan
4.2. Project Technical Specifications
4.3. Project-Approved Material Submittals
4.4. Safe Energy and Isolation Method of Statement
4.5. Manufacturer Recommendations for Installation & Commissioning
4.6. Project HSE Plan
5. Health & Safety Requirements
5.1. Solvent cement is flammable. Do not work near a naked flame or smoking is prohibited in any area of the site.
5.2. Solvent cement should be used in well-ventilated conditions.
5.3. The instructions on the solvent cement tin, especially those relating to first aid, should be strictly adhered to.
5.4. If solvent cement is spilled in the trench or on the backfill material, the contaminated material must be removed from the working area and disposed of following local municipality regulations.
5.5. The solvent in the cement evaporates quickly, so the tin should be closed immediately after use.
5.6. Ensure the work area is clean and tidy.
6. Installation Sequence for Drainage Accessories
Examine areas and conditions in preparation for installation, for compliance with the specification.
General locations and arrangements:
6.1. Drawings (Plans, schematics, and diagrams) indicate the general location and arrangement of drainage pipes and accessories.
6.2. Install drainage accessories as indicated, except where deviations to the layout are approved on coordinated drawings.
6.3. Ensure the installation of drainage accessories and components as per the approved drawings and material submittals.
6.4. Install drainage accessories in concealed interior and exterior locations except in equipment rooms and service areas, as per approved drawings.
6.5. Install exposed interior and exterior drainage accessories at right angles or parallel to building walls.
6.6. Diagonal installations are to be avoided, except where indicated.
6.7. Install drainage accessories tight to slabs, beams, joists, columns, walls, and other building elements where possible.
6.8. Allow sufficient clearance space for maintenance purposes.
6.9. Install hangers and supports, clamps, and attachments as required to properly support drainage accessories from the building structure.
6.10. Install cleanouts in aboveground piping and building drain piping.
6.11. Install floor drains at low points of surface areas to be drained.
6.12. Set grates of drains flush with the finished floor unless otherwise indicated.
6.13. Position floor drains for easy access and maintenance.
6.14. Install trench drains at low points of surface areas to be drained. Set grates of drains flush with the finished surface unless otherwise indicated.
7. Installation of Parking Drains
7.1. Be sure that the bottom forms are already fixed and leveled. This will be carried out through the coordination of a competent supervisor from the civil contractor.
7.2. Marking out the location of the parking drain to the bottom forms using a marker pen as shown on the approved drawings.
7.3. In case the location of the parking drain conflicts with the location of the slab reinforcements, proper adjustments to the reinforcement are to be carried out.
7.4. Install the parking drain as per approved drawings and adjust the upper rising frame that will make the removable grate 1cm lower than the tower area’s preferred slope for gradient allowance during the concrete.
7.5. Fixing the parking drain body by locking the bottom part of the using nails punched to the form and lock bars tied into the parking drain body and slab reinforcement.
7.6. Shear bars are to be provided after the parking drain is already fixed and the height is already adjusted.
7.7. Once the drain is already fixed, remove the removable grating, provide caulking inside the drain and cover the drain with fabricated plywood wrapped by sealing tape to avoid ingress of concrete during the concrete pour.
7.8. The removable grate is to be kept and installed once the slab is cleared.
8. Connection Methods
Installation of piping adjacent to equipment to allow Service and Maintenance (SM).
Oil Interceptor s Installation:
8.1. Check clear access for installation has been handed over by the main contractor & ensure preceding trades have completed their respective works at the site.
8.2. A concrete pit must be prepared as per the approved Builder work drawing.
8.3. Check that the level of the concrete foundation is within the permitted toleration in all directions ± 5mm also the solidity and the thickness of the concrete foundation must correspond/conform with the load capacity of the ground and the weight of the tank when full.
8.4. 110 mm diameter inlet/outlet connection to be made using push-fit solvent system couplers.
8.5. Oil collection tank high-level provision should be provided for monitoring by BMS. When the level in the oil collection tank reaches a high level, a volt-free signal is actuated by the level sensor switch to the BMS panel.
8.6. After successful installation & inspection by MEP Consultant Engineer, charge the system and check for leaks. If a leak is found, repair leaks and retest until no leaks exist.
8.7. Engage factory-authorized personnel for training operations and maintaining oil interceptors.
8.8. Install & fasten permanent nameplate for interceptors as per specifications.
9. Checking the Slope of the Drainage Pipe
9.1. Select the spirit level that will rest against the drainage pipe you are measuring without contacting fittings or other obstacles.
9.2. The level must be put and or kept only on the pipe.
9.3. Set the spirit level on the top of the pipe or hold it against the bottom.
9.4. Note the position of the spirit level’s bubble, it should not be centered.
9.5. Lift the end of the spirit level until the bubble is centered.
9.6. Measure the distance between the end of the spirit level and the drainage pipe.
9.7. The distance is the slope of the pipe along the length of the spirit level. The standard slope for most soil and waste pipes is 1 percent downward in the direction of flow.
9.8. Verify that the slope is in the right direction. The pipe must slope downward from the source of water or waste towards the main sewer or catch basin.
10. Inspection Checklist for Drainage Accessories Installation Testing and Commissioning
11. Attachments
11.1. Risk Assessment Sheet
11.2. Pre-Commissioning & Start Up Check List
11.3. Testing & Commissioning Test Sheets
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