Aug 26, 2021

Internal CPVC and PVC concealed plumbing Work - Standard Work Procedure

Plumbing Work

(Internal CPVC, PVC concealed)


This work procedure enumerates the scope of Plumbing work to be executed in Tower area as specified in the approved drawings and at places when instructed by the Tower-in-charge.


The respective Tower-in-charge is responsible to execute the work as per procedure.

Safety & protection:

PPEs like safety belts at height, helmets, safety goggles, ear plugs and hand gloves etc. should be used properly. 

Ensure the working area is kept clean for easy access.

Proper illumination to be provided during the work, if required.

Educate the workmen through pep-talk meeting. 

Internal CPVC concealed plumbing:

Preparatory Works:

Ensure the plumbing materials received are as per the approved drawing and specification.

Check the tile layout marking on walls and level pads showing the finish wall face after tiling.

Do mark the reference level on wall at 600mm above FFL.

With the help of tile layout and plumbing drawing mark the points and plumbing lines on wall.

Check the layout and do adjustment to bring points at correct location as per tile layout, required if any.

Chase the marked wall portion first with cutting machine by making small slices on wall and then remove it with chisel and hammer.

Mark the plumbing point on wall again in order to measure the length of pipe required to be cut.

On ground assemble the skeleton of pipes and fittings (Elbow, T, brass elbow, socket etc.). Use CPVC adhesive supplied by manufacturer for jointing.

Check the alignments of elbow fitted on pipe for their alignment, if elbows are fitted incorrectly then same should be removed by cutting pipe and new fittings should be made (Record the wasted material due to poor workmanship).

Work Method: 

Fix the assembled skeleton on wall with plumbing nails and binding wire as per layout.

Do pressure testing of installed line as follows;

For pressure testing ensure hydraulic pressure testing machine of capacity 20kg/cm2 is available.

Fix the connector pipe to machine and on the end point on wall or on point which is most feasible for doing testing.

Fix a ball valve at another end point to release the entrapped air in pipe to avoid false result during testing.

Fix plugs on all other points.

Apply the pressure at 10kg/cm2 and keep it for 45 minutes.

Do check for any visible leakages at joints and at plugs.

If pressure drop observed or any leakage is observed rectify the same and do pressure testing again.

After successful testing, record the result. Fix all elbow points in position with the help of cement paste.

Check all points for its correct alignment. All elbow points should be fix 10mm in from finished tile face to ensure proper grouting and sealing of joint at later stage of work. Flush wall should be fixed in position as per the specification of manufacturer.

Do fill the chased portion with cement mortar of 1:4 and cure it for minimum 4 days.

Internal PVC Concealed Plumbing:

Preparatory Works:

Ensure the material received is as per approved plumbing drawing and specifications.

Do check leakage testing of waterproofing base coat is completed.

Do check all cutouts on wall for drainage are in plumb to ease the external plumbing work.

As per the tile layout and approved plumbing drawing do dry laying of points and measure the length of pipe required.
Fitting are push type (Ring fitting) which have rubber ring in fitting. File the cut pipe portion to avoid damages to rubber after fitting.

Apply lubricant supplied by manufacture on inner face of fitting and then insert filed edge of pipe inside it.

For Multi floor trap (MFT)  when there are two MFT or need to fit the WHB or any other pipe. Reducer of 50 x 40 should be used at MFT and it should be fixed to it, by using PVC solvent specified by manufacturer.

MFT should be fixed as close as to wall or max at 150mm from wall finish face.

Lay the assembled skeleton to its final location and fix in slop as specified with the help of cement mortar of 1:4.

Do check the all points and slop is as per approved tile layout and plumbing drawing.

At points where pipe crosses the wall, portion of pipe which goes into wall area should be made rough by applying PVC solvent and sprinkling sand on it to ensure bonding.

CBEC India


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