Internal CPVC and PVC concealed plumbing Work - Standard Work Procedure

Plumbing Work

(Internal CPVC, PVC concealed)

Introduction:

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.

Responsibility:  

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.

Team 

CBEC India

Gypsum Plaster/POP - Standard Operating Procedures

Gypsum Plaster

Introduction:

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

Responsibility:

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

Safety & protection:

Working space to be clear of debris so that easy access is ensured

Scaffolding to be checked for the load carrying capacity and ensure no overloading.

Lifting, manual transporting of materials have to be carried out by workers who are properly trained. Otherwise this may cause serious injuries to workers.

Throwing of debris from height strictly prohibited.

PPEs should be used properly.

 

Preparatory Works: 

All the nails, binding wire, masking tapes and wooden piece shall be removed from concrete surface.

All the dust, oil spots, and green algae, if any shall be cleaned from concrete and Blockwork surface with the help of wire brush.

Proper scaffolding shall be provided to allow easy approach to every part of the work. 

In no case, holes in Blockwork should be done for supporting scaffolding.

At place of work where sufficient natural daylight is not available, artificial light shall be made available.

Level pads of size 1 x 1 shall be made on the walls. 

Level pads shall also be checked for vertical alignment with the help of plumb bob, for right angle with the help of try square and for diagonal dimension of room with the help of tape.

Fiber mesh should be fixed on all concrete and blockwork joints (except base course joint). 

In case of level differences in adjoining surfaces, the same shall be made up before fixing of chicken mesh.

Ensure Concrete surface roughened for proper bonding.

All electrical chases shall be filled with cement mortar and properly rendered with non-shrink grout and application of fiber mesh over it. 

Curing should be done for 7 days before starting any type of plaster.

All the conduit drops shall be checked and concealed with plaster, if any visible in opening area.

All the ceiling points and wall points shall be checked for level and dimensions as per drawing or as per clients requirement if any. 

Ensure electrical boxes and light point boxes are in line with finish face of plaster.

Gypsum plaster thickness shall be restricted to 10 - 15 mm for walls and 6 to 8 mm for ceiling. 

If because of undulations the final thickness is expected to be more than 15 mm, back coat is recommended before applying Gypsum Plaster.

Back coat of 6 to 10 mm thick (cement sand mortar) shall be applied on Blockwork. 

Curing of Back coat shall be done for 7 days before starting gypsum work. 

Back coat shall be in rich 1:4 cement mortar.

After applying Back coat (wherever required if any) or after checking the thickness of gypsum plaster, Level strips of Gypsum shall be made through full height of wall and shall be checked for vertical alignment with the help of plumb bob, for right angle with the help of right angle and for diagonal dimension of room with the help of tape.

Level strips of Gypsum 6 wide shall be made on ceiling at wall  ceiling Junction and it should be checked for right angle.

Work Method: 

Gypsum plaster shall be applied only after back coat dries off completely.

Mixing of gypsum should be done in clean buckets/ trays as per proportions specified by manufacturer.

Old left out mix should not be used with new mix at any time.

The Gypsum shall be dashed against the prepared surface. 

The dashing of the coat shall be done using a strong whipping motion at right angles to the face of the wall.

The coat shall be led hard and tight forcing it to surface depressions to obtain a permanent bond and finished to smooth surface.

The finishing is made with the help of trowel and Metal straight edge.

Surface should be smooth after application and should be check for plumbs, right angles.

No chasing shall be done after application of final coat on walls /ceilings.

Electric switch boxes, fan boxes etc. shall be cleaned immediately after completion of plaster.

Floor should be cleaned on completion of days work.

Team 

CBEC India 

Electrical Work - Standard Work Procedure

Electrical Work

Introduction:

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

Responsibility: 

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

Safety & protection:

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

 

Ensure the working area is kept clean for easy access.

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

Educate the workmen through the pep-talk meetings. 

 

Work Method:

Slab Conducting:  

Customer changes shall be reviewed at the time of slab conducting work and changes should be incorporated.

Conduits for electrical work shall be fixed as per drawing and only after completion of reinforcement work completely.

A minimum 1-inch gap shall be kept between two conduits to ensure uniform concreting. 

In lobby areas keep the gap by bunching two conduits.

Ensure drops of beam light points and wall light points are not placed in the opening area.

For wall conduit points, ensure drop goes in the wall area by checking wall alignment in drawing (This will ensure no conduit projecting out from beam bottom on wall face after doing wall conducting).

Conduits should be fixed firmly by tying with reinforcement at the approx 1-meter intervals.

Check for uniform application of cement solvent at pipe joints and at bends.

Electrical and telephone conduit should have, a minimum distance of 150 mm between them.

Conduit shall be fixed with a minimum cover of 5mm.

Protection of ends of conduit, lightbox, and fan box shall be done to ensure no choke after concrete.

Wall Activity:

After De-shuttering, all electrical points should be opened and wire passing should be done. The wire should of GI 18 SWG.

Record the points which are choked and can't be rectified. Make a correction plan for the same.

After Completion of Blockwork and level pads for internal plaster, mark reference floor level on walls at 600mm from FFL.

Chase wall portion for fixing switch boxes by using a cutter, chisel, and hammer.

The switch box shall be fixed as per drawing, in line with internal plaster level pads on the wall and with the help of reference level.

Chasing for conduits on walls shall be done with the chasing machine only.

In case points are choked and are taken through the floor, the saddle clamp should be fixed at the wall and floor corner on both sides.

Filling of conduit chase shall be done by Blockwork contractor with cement mortar of 1:4 and it should be cured for minimum of 7 days.

Wiring and Fittings:

After Approval from Tower-in-charge, wiring activity should be started and done as per color coding shown on the drawing.

At the time of wiring, if any wall finish gets damaged, it should be shown to Tower-in-charge to ensure repairs.

Once the 2nd coat of putty is completed in the flat area or as per instruction from Tower-in-charge light fitting fixing should be started.

If the embedded box is damaged or the edge finishing around it is incorrect or the wall finish around the board is not in line then the switch plates or cover plates should not be fixed in position without rectifying the defect.

To connect wires on the switch as per color coding and as shown in the drawing.

 

Fix switch plates in position and check for their level and alignment.

Do fix cover plate on top of switch plates and check for its alignment and fitting.

In case a wall point is made on the wall by doing the local adjustment, check its feasibility by overlooking other finishes.

Void should not be seen around the cover plates, in case there is void it should be rectified by removing the switch plate. Do not allow local repair touch without removing it.

Do check operation of all switches and light point for their correctness, its responsibility of Electrical engineer to ensure wiring done correctly and all switches and light points are working correctly.

Team 

CBEC India

Internal Plaster Work - Standard Work Procedure

Internal Plaster Work

Introduction:

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

Responsibility:  

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

Safety & protection:

Working space to be clear of debris so that easy access is ensured.

Scaffolding to be checked for the load carrying capacity and ensure no overloading.

Lifting, manual transporting of materials have to be carried out by workers who are properly trained. Otherwise this may cause serious injuries to workers.

Throwing of debris from height strictly prohibited.

PPEs should be used properly.

 

Preparatory Works: 

All the nails, binding wire, masking tapes and wooden piece shall be removed from concrete surface.

All the dust, oil spots, and green algae, if any shall be cleaned from concrete and Blockwork surface with the help of wire brush.

Proper scaffolding shall be provided to allow easy approach to every part of the work. 

In no case, holes in Blockwork should be done for supporting scaffolding.

At place of work where sufficient natural daylight is not available, artificial light shall be made available.

Level pads of size not less than 2 x 2 shall be made on the walls and if required on ceiling also to serve as finished reference level surface. 

The distance between level pads shall not exceed 6 in any direction so that their surface alignment can be checked with the help of aluminum straight edge.

Level pads shall also be checked for vertical alignment with the help of plumb bob, for right angle with the help of right angle and for diagonal dimension of room with the help of tape.

Fiber mesh should be fixed on all concrete and blockwork joints (except base course joint). 

In case of level differences in adjoining surfaces, the same shall be made up before fixing of chicken mesh.

Ensure Concrete surface roughened for proper bonding.

All electrical chases shall be filled with cement mortar and properly rendered with non-shrink grout and application of fiber mesh over it. Curing should be done for 7 days before starting any type of plaster.

All the conduit drops shall be checked and concealed with plaster. If any visible in opening area.

All the ceiling points and wall points shall be checked for level and dimensions as per drawing or as per clients requirement if any. All electrical boxes and light points should be in line with finish face of plaster.

Ensure all electrical boxes are protected with plastic sheet packing before plaster.

Do wet the surface to receive plaster one hour before, so that while starting plastering, the surface is skin dry.

Work method for plastering: 

The mortar for plastering has to be prepared in Tray or on a firm or on metal sheets only.

Do prepare the mortar in clear area in proportion as follows;

Bond Coat / Key Coat  1:4 with 6mm fibers @ 100 grams per bag of cement (Strongplast)

Finish Coat  1:5 with 6mm fibers @ 100 grams per bag of cement (Strongplast).

Do mix mortar which can be consumed with in next 2 hours.

For kitchen and ducts plaster 100% Crush Sand should be use.

For toilets plaster Crush sand and river sand in 50:50 % proportions should be use.

Do add water to the dry mixed sand and binder (not otherwise).

While applying plaster on walls, empty cement bags shall be placed on floor near walls and rebounded mortar fallen on bags shall be put back into mixed mortar before it sets and 10% additional cement should be added in that mix and remixing should be done before its use.

Proper checking and supervision for plumb, line, right angle, measurement of openings after application of plaster should be done by site supervisor / engineer.

Electrical switch boxes shall be perfectly in line with plaster.

For Bond Coat / Key Coat curing should be done for minimum 3 days.

For finish Coat Curing should be done for minimum 10 days.

After completion of plaster clean the floor and all electrical boxes.

Team

CBEC India