Drainage Accessories Installation Method of Statement

Below is a precise method of statement that describes the procedure for installation of Drainage Accessories.

This document defines the methods to be used to ensure that the plumbing works to be conducted at site are in compliance with the approved designs and approved material submittals.

Prior to installation of drainage accessories, the supervisor  and foreman will verify and ensure that all the health and safety requirements have been complied with.

The supervisor will verify that all relevant approved latest revisions of shop drawings, technical submittals, inspection and test plans are in the work place for installation reference including the installation procedures.

Health & Safety Requirements

Solvent cement is flammable. Do not work near a naked flame or smoking is not allowed in any area of the site.

Solvent cement should be used in well-ventilated conditions.

The instructions on the solvent cement tin, especially those relating to first aid should be strictly adhered to.

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 in accordance with local municipality regulation.

The solvent in the cement evaporates quickly, so the tin should be closed immediately after use.

Ensure work area is clean and tidy.

Installation Sequence for Drainage Accessories

Examine areas and conditions in preparation to installation, for compliance with the specification.

General locations and arrangements:

Drawings (Plans, schematics and diagrams) indicate the general location and arrangement of drainage pipes and accessories.

Install drainage accessories as indicated, except where deviations to lay out are approved on coordinated drawings.

Ensure the installation of drainage accessories and components as per the approved drawings and material submittals.

Install drainage accessories in concealed interior and exterior locations except in equipment rooms and services areas, as per approved drawings.

Install exposed  interior and exterior drainage accessories at right angles or parallel to building walls.

Diagonal installations are to be avoided, except where indicated.

Install drainage accessories tight to slabs, beams, joists, column, walls, and other building elements where possible.

Allow sufficient clearance space for maintenance purposes.

Install hangers and supports, clamps, and attachments as required to properly support drainage accessories from building structure.

Install cleanouts in aboveground piping and building drain piping.

Install floor drains at low points of surface areas to be drained.

Set grates of drains flush with finished floor, unless otherwise indicated.

Position floor drains for easy access and maintenance.

Install trench drains at low points  of surface areas to be drained. Set grates of drains flush with finished surface, unless otherwise indicated.

Installation of Parking Drains

Be sure that bottom forms is already fixed and leveled. This will be carried out through coordination of competent supervisor from the civil contractor.

Marking out the location of the parking drain to the bottom forms using marker pen as shown on the approved drawings.

In case the location of the parking drain conflicts with the location of the slab reinforcements, proper adjustments to the reinforcement to be carried out.

Install 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 concreting.

Fixing the parking drain body by locking the bottom part of the using nails punched to the form and lock bars tied-in to the parking drain body and slab reinforcement.

Shear bars to be provided after the parking drain is already fixed and the height is already adjusted.

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 concrete pour.

Removable grate to be kept and installed once the slab is cleared.

Connection Methods

Install piping adjacent to equipment to allow service and maintenance.

Oil Interceptor s Installation:

Check clear access for installation has been handed over by main contractor & ensure preceding trades have completed their respective works at site.

Concrete pit has to be prepared as per approved Builders work drawing.

Check that the level of the concrete foundation is within the permitted toleration in all direction ± 5mm also the solidity and the thickness of the concrete foundation must correspond with the load capacity of the ground and the weight of the tank when full.

110 mm diameter inlet / outlet connection to be done using push fit solvent system couplers.

Oil collection tank high level provision should be provided for monitoring by BMS. When the level in the oil collection tank reaches at high level, a volt free signal is actuated by the level sensor switch to the BMS panel.

After successful installation & inspection by MEP Consultant Engineer, charge system and check for leaks. If leak found, repair leaks and retest until no leaks exists.

Engage a factory authorized personnel for training operation and maintaining oil interceptor.

Install & fasten permanent nameplate for interceptors as per specifications.

Checking the Slope of Drainage Pipe

Select the spirit level that will rest against the drainage pipe you are measuring without contacting fittings or other obstacles. The level must rest only on the pipe.

Set the spirit level on the top of the pipe or hold it against the bottom. Note the position of the spirit level’s bubble, it should not be centered. Lift the end of the spirit level until the bubble is centered.

Measure the distance between the end of the spirit level and the drainage pipe.

The distance is the slope of the pipe along the length of the spirit level. The standard slope for most soil and waste pipe is 1 percent downward in direction of flow.

Verify that the slope is in right direction. The pipe must slope downward from the source of water or waste towards the main sewer or catch basin.