Method Statement for Installation of Waste Water & Sanitary Waste Water Line

This Method Statement is applicable to all PVC Wastewater & Sanitary wastewater Plumbing activities regardless of sizes and classes, which are to be installed on the [Project Title] Project, [Location]. 

The procedure is intended to provide general application guidance and establish controls during preparation and installation and to ensure that the installation of PVC Waste Water & Sanitary Wastewater Lines are carried out safely, efficiently and in accordance with good working practice, as per OWNER Job Specification.

Pre-Installation Activities of Waste Water & Sanitary Waste Water Line

•  Ensure that all relevant documents have been approved by OWNER prior to installation, and that the latest revisions of IFC drawings, specifications including, approved procedures are disseminated to concerned personnel who will carry out the work.

•  Ensure that all PVC Underground Plumbing Materials to be transported from warehouse / laydown area to the work area comply with the project specifications. Site handling and identification of all piping materials and components shall be in accordance with SUBCON Standard Operating Instructions. 

•  PVC Pipes & Fittings should be given adequate support at all times. Pipes & Fittings Should not be stacked in large piles, especially in warm temperature conditions, as the lower layer may distort; Any Pipe with ends prepared jointing (socket & spigot joints, “A” joints, etc.) should be stacked in layers with socket placed at alternate ends of the stack and with socket protruding.  

•  For field storage, where racks are not provided, ensure that the ground is level and free from loose stone. Pipes must be stored off the ground on proper dunnage and should not exceed three layers high and should be stacked to prevent movement. The storage area should be barricaded and sign boarded.

•  Ensure that the PVC Pipe is always stored in shaded area or provide polyethylene blue sheet cover to avoid ultra-violet (U/V) degradation from the sun’s rays.

•  Check and verify the location and orientation of piping to plant North on IFC isometrics / plan drawings. Establish good reference points for proper alignment.

Installation Activities of Waste Water & Sanitary Waste Water Line

CUTTING & CHAMFERING

•  Pipes should be layed in proper bedding material to avoid damage during installation.

•  Pipe should be cut square. Method of cutting pipes square is to place a wraparound around pipe with no overlap of the edges. Mark a line around pipe (felt pen is ideal). Cut to line with a fine toothed saw. (See Figure 1, available on the native file)

•  Pipe end should be chamfered at an angle 15 degrees to about one third (1/3) of the wall thickness with the course file, sub-form tool or chamfering tool. (See Figure 2, available on the native file).

•  Check the angle is correct with a bevel gauge.

SOLVENT WELD JOINTS

•  Mark Depth of entry of the pipe into socket and alignment mark and make an alignment mark parallel the long axis of the pipe.  (See Figure 2, available on the native file)

•  Roughen the outside of the pipe and the inside of the socket using sand paper or emery cloth up to the entry mark. ( See Figure 3, available on the native file)

•  Clean both surfaces and remove all dust, grease and stain using dry clean cloth and cleaner (See Figure 4, available on the native file)

•  Stir Solvent adhesive thoroughly.

•  Apply adhesive with out delay after cleaning, using a flat clean brush. Apply an even unbroken layer brushing axially to the pipe end socket mouth with a heavier layer on the pipe. Where loose fits are found, the pipe should be given a second coat.  

(See Figure 5, available on the native file)

•  Immediately insert the pipe into the socket up to the entry mark, align pipe & socket, Hold in position for a few seconds, then wipe off excess cement (DO NOT TWIST).

(See Figure 6, available on the native file)

•  Always replace lid of the can after making a joint and follow the instructions on the can observing any warning.

AFTER JOINTING

•  New joints should not be moved or disturbed for 10-15 minutes after which the jointed pipe may be handled with care. Allow four (4) hours if the jointed pipe lengths are to be laid in an extended pipe run.

•  Ensure that the pipe is properly supported by use of sufficient approved bedding materials, which must be free from large stone, sand, sharp object that could damage the pipe.

•  Check compliance of slope & elevation to the approved for construction drawing.

•  Ensure that all type of inspection & testing including service testing has been executed before commencing back filling.

•  Carefully backfill and compact as per project specification requirement.

•  Upon completion and acceptance of inspection, conduct housekeeping properly.

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