Method Statement of Drainage Pipe Installation

Introduction

This method statement outlines the proper procedure for the installation of drainage pipes inside a toilet. The installation process involves careful planning, precise measurements, and adherence to approved shop drawings to ensure the efficient functioning of the drainage system.

PVC Drainage Pipe

The installation of PVC drainage pipes within a toilet is a crucial component of the plumbing system. This section will guide you through the necessary steps to ensure a successful installation.

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Installation Steps

1. Review Approved Shop Drawing

Begin by reviewing the approved shop drawing, which includes essential details about the drainage pipe layout, toilet specifications, and the location of mechanical pipe sleeves.

It is essential to complete block work (excluding shaft walls) and waterproofing activities before proceeding with the installation.

2. Prepare Pipes and Fittings

Ensure that all required pipes, drainage pipes, stub pipes, and fittings are on hand before commencing work inside the toilet.

Maintain access to a nearby vertical shaft or duct to facilitate work, particularly in connection to the risers.

3. Mark Pipe Locations

Follow the approved shop drawing to mark the exact locations of pipes on the wall or floor.

Use appropriate guidelines to outline the areas where pipes will be buried, both in the wall and for the lavatory and A/C drain.

4. Cut Block Openings

To accommodate the sanitary pipes, use a block cutter or a portable grinder to carefully cut along the marked lines.

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Take extreme care not to damage pre-installed pipe sleeves for fixture vents and A/C indoor units.

5. Prepare Block Surface

Using sharp-pointed steel rods and suitable chipping tools, chip the block sides to achieve the required thickness for securing the sanitary pipes.

6. Use Approved Fittings and Materials

Ensure that standard fittings and materials are utilized and that all drainage pipes and fittings are properly joined using approved glue.

For vent pipes, install sanitary tee fittings inclined at a 45° angle or sloping from the center line of the serving pipe.

How to Lay Drain Pipe

7. Confirm Slab Levels

Before installation, consult with a surveyor to confirm the level of the slab. Establish alternative reference points for pipe and pipe fittings installation.

8. Install Pipes at Designated Heights and Slopes

Place the pipes at the designated heights, locations, and slopes. Aim for a 1% slope for sanitary fixtures and a 0.5% slope for the A/C drain.

Ensure that the outlet locations for sanitary fixtures are correctly installed and identified.

9. Ensure Proper Drainage Flow

All drainage pipes, apart from the water closet drain (e.g., A/C drain, lavatory drain, bidet drain, bathtub drain, and shower tray drain), should slope toward the gully trap floor drain by the approved shop drawing.

10. Provide Stable Support

Connect the pipes and pipe fittings on compacted fine sand and a partially small amount of cement mortar for support.

Maintain a height distance of two (2) centimeters between the gully trap bottom and the slab for all toilets.

How to Install Drains

11. Protect Waterproofing

Exercise extreme caution to prevent damage to the waterproofing during the installation process.

12. Install Sleeves for Wall Penetrations

When pipes pass through concrete or masonry walls, install sleeves and apply sealant between the pipes and sleeves.

13. Check Secure Installation

Ensure that the pipes are securely fixed, joints are properly sealed, and caps are in place before proceeding to the leak testing phase.

14. Perform Leak Testing

Leak testing of the installed drainage pipe should be conducted in the presence of the inspector engineer.

15. Final Covering

Upon approval from the inspector engineer, cover the drainage pipe with cement plaster or sand where applicable.

By following these steps, you can ensure a well-executed installation of drainage pipes inside the toilet, promoting effective wastewater management and maintaining the integrity of the plumbing system.

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