INSTALLATION PROCEDURE OF EXTERNAL PLUMBING

INSTALLATION PROCEDURE OF EXTERNAL PLUMBING

External Plumbing

Pre Installation Procedures:

1)    A licensed plumber shall be employed to carry out all plumbing works and a Photo Copy of his license shall be kept ready for producing before any authorized agency coming for inspection.

Schematic layout of external plumbing

2)    Approved plumbing drawing shall be made available on site.

3)    For CPVC pipes, technical literature and manufacturer’s user guide manual shall be made available on site

4)     Layout of pipes shall be marked on external wall surface as also on terrace and shall get approved from plumbing consultant. It shall be ensured that vertical lines so drawn are in plumb.

5)     Holes shall be made in parapet wall. Diameter of holes shall be 1” more than the respective diameter of pipes.

6)     In Over Head Water Tank and Under Ground Water Tank GI pipe sockets shall be provide as inserts at the inlet / outlet locations to avoid puncturing of RCC walls later.

During Installation Procedures (External plumbing):

Installation of GI Pipes:

1)    GI pipes shall be cut to the required length as per layout on walls and terrace. Coconut oil shall be used while threading.

2)    Pipes shall be cut at perfect right angles and burrs, if any, shall be removed by deburring tool. Round wheel cutter OR cutter recommended by manufacturer shall be used for cutting CPVC pipes.

3)    Number of threads in GI pipes shall be minimum 11 per 1” length, Pitch of threads shall be around 2.4mm and depth of threads shall be 1.48mm.

4)    All GI fittings shall be washed with kerosene to remove rust inside, prior to their installation.

5)           Fittings   shall   be   fitted   using   “Habak”   and   “Teflon”   tape   only    while    jointing    pipes. Vertical pipes shall be laid truly vertical by checking their plumb. Horizontal pipelines shall be truly horizontal. Slant piping shall be avoided.

6)      Adequate distance shall be maintained between main pumping lines and wall surface for maintenance purpose.

7)    Vertical pumping mains shall be double clamped near joints, connections, bends and turns to avoid bursting of pipes.

8)    Clamps for CPVC pipelines shall be of plastic or PVC as specified by manufacturer. (Metal clamps shall be avoided). Clamps for vertical CPVC pipelines shall be kept loose for free movement of pipes near expansion loop, if specified. Expansion loop shall be adequately supported.

9)    Entry of pipes through walls shall be at right angles.

10)     Pressure reducing valves shall be provided for high rise buildings and Control valves shall be provided for each branch line of OHWT. Control valve position shall be easily accessible for operating through toilet window, if possible.

11)      Foot valve location shall be kept 4” - 6” above tank bottom / sump level. Non return valves shall be provided near pumps.

12)     Vent pipes shall be provided for all outlets through OHWT to prevent air locks.

13)     Cleanout provision at bottom shall be provided for each line separately.

14)     Pipeline on terrace shall necessary run along parapet and be properly anchored to parapet wall with the help of saddles / clamps.

15)     Underground main GI pipeline including fittings shall be applied 2 coats of bituminous paint (Black Japan) before installation and shall be preferably supported on concrete pedestals.

16)       In case internal piping network is to be connected to outside water supply lines of different material, suitable adapters with sealants shall be used. Refer joinery at the end of this section.

17)      Open GI pipes shall be applied with oil paint as an anti corrosive treatment over a base coat of red oxide primer.

18)     Exterior grade latex paint shall be applied on CPVC pipes for UV resistance.

19)     In case, solar water heating system is provided, temperature control system shall be installed and adequate precaution shall be taken to avoid mixing of hot and cold water. Also GI hot water pipes shall be wrapped with wool piles and Aluminum foil for which minimum 1” clear distance between wall and pipe surface shall be kept.

Post Installation Procedures:

1)     After complete erection of pipeline and plugging open ends, flushing of entire pipeline shall be carried out by keeping only one of the pipe fitting open.

2)    Gravity pressure testing shall then be carried out by completely filling the entire pipeline with water for 24 hrs and leakages through pipelines, if any, shall be observed.

3)  If leakages are observed during Pressure test, necessary repairs shall be carried out which may involve replacing part of pipeline. Pressure testing shall then be carried out again.

4)  After the pressure test is successfully carried out, holes in masonry shall be filled with non-shrink grout and the grout shall be cured for at least 3 days.