FIELD OF INVENTION:

The invention relates to the development of a dual thickness pipe and the pipe threading used in water discharge piping system and more particularly to the method of reducing the weight of the pipes and to give more strength to the piping in the threaded PVC pipe joint couplings used for submersible pump applications in bore wells to connect and support the submersible pumps and also to act as delivery pipes to draw water from underground for drinking and irrigation purposes.

BACKGROUND OF THE INVENTION:

The application of PVC is widely accepted by the market and day-by-day increasingly new models are emerging for different usages.

Substitute for Irrigation: PVC pipes are first designed to become substitutes in the fields for irrigation purposes to distribute water. These PVC pipes are placed underneath the soil by which they are more- advantageous than the metal pipes from rust and damages.

Substitute for drainage & plumbing: PVC pipes are designed to use for supply waste water & potable water to take care of house hold necessities and are used as the plumbing pipes to supply the water from the over head water tanks to the bathrooms and at necessary outlets. Also these are designed as the drainage pipes to carry the drainage from the bathrooms to the common outlets.

Bore wells: Until now for the bore wells in case herewith submersible pumps it was widely acceptable method of drawih'g the water from the bore wells through steel galvanized pipes. These -sleel galvanized pipes are threaded both sides and by using threaded steel galvanized couplings two pipes are joined. The main disadvantage in these pipes are that they get rusted in the long run and the pipes breaks in the bore well damaging the whole bore & loss of pump.

In addition, these pipes being very heavy requires more staff or special equipments like chain pulley to remove the pipes from bore well when needed for any repairs.

While the galvanized steel pipes are suspended with the load of the pump & filled with water, they corrode & get rusted over a short period of time and the pipe breaks putting the whole equipment at risk of falling inside the borewell. The threads are prone to corrosion & resistance even more as they are not galvanized.

To over come this drawback many have tried in developing the alternative light weight, high strength, long life pipes. As the PVC is one alternative to replace the steel galvanized pipes, there have been very few successful inventors to create an alternative for this application.

One of such alternative is making pipes & coupling with PVC material. The disadvantages in these pipes are many.

Main drawbacks of this type of the models are :-

1. The pipes are totally made with PVC with equal width and thicknes at all levels by which the unnecessary thickness at the center / middle of the pipes forms as the overload to the pipe when filled with water. 2. The thickness being the same at all levels and the ends are cut in the shape of threads by which there is a loss of material and at last the end of the pipe becomes thin. 3. When the threads are fixedjnto a copuler, due to the less thickness formed out of threads will jpfot have much load bearing capacity. Since all the alternatives were having some type of problem and dis-advantages therefore a right product for use with submersible pumps was most necessary.

The inventor has developed a PVC pipe which is more reliable and has got more grip threads for high strength. and more advantageous.

OBJECTIVES OF THE INVENTION:

1. The objective of the invention is the pipes are made with Polyvinyl Chloride, very rigid and lightweight & user friendly.

2. Another advantage is the pipe thickness is maintained different at ends & barrel to give lighter weight and also to have more strength.

3. Another advantage is the threads are specially designed square threads having very high load holding capacity.

4. Another advantage is the pipe are very economically priced as the thickness and the quantity of material used is very much less than compared to ordinary PVC pipes.

SUMIVIARY OF THE INVENTION:

The pipes used for the piping system to draw the water from the bore wells after being joined using a coupler are manufactured individually having a length of 3000 mm to 5000 mm depending on the requirement. These pipes are made with polyvinyl chloride having the different thickness at ends & barrel. The both ends of the pipes are highly thickened to a thickness of 2.0 mm to 11.0 mm. The thickness at the ends are maintained to a length of 200 to 250 mm inwards starting from the both ends. The thickness after these ends in the barrel is reduced to a minimum thickness of 1.0 mm to 8.0 mm. At the both ends after the pipes are manufactured with more thickness than the barrel threads are being made which are in square shape. The threads are cut to a depth so that the thickness at the both ends under the threads is equal to the thickness at the barrel of the pipe. Thus after the pipe is manufactured and threaded the thickness at the both ends under the thread and barrel became almost same.

DESCRIPTION OF THE DRAWINGS:

Figure 1 is the longitudinal section view of the pipe showing the different thickness at the both ends along with the threads and also the same and equal thickness of the pipe after cutting the threads.

DESCRIPTION OF THE PREFERRED EMBODIMENTS:

Figure 1 depicts the PVC pipe showing the thickness at the center (1), higher thickness at the ends or below the threading (2), Square thread cut to a specific depth (3), thickness below the threading (4).

Here the invention addresses the thickness of the pipe so designed to maintain the same thickness after the threads are made at the end of the pipe (3). As the pipe before the threads are made is of different thickness at two different levels i.e., at the ends the thickness is mainaitned between 2.0 mm to 11.0 mm (4) and center the thickness is maintained between 1.0 mm to 8.0 mm (1). A chart is made indicating the thickness of the pipes at ends and inside the barrel with different outside diameters.

When the PVC pipe is thus manufactured with the two different thickness the thicker level is called as the end (4) and the thinner level is called as the center (1). At the thicker level (4) or at the ends of the pipes the threads (3) are cut to be used in fixing or joining both the pipes with a coupler. These threadsvare cut to a depth such that the thickness after the threads / below the threads is"equal to the thickness at the center of the pipe. Thus the dual thickness of the pipe is adjusted and by which the threads are made in extra thickness provided at the ends of the pipe. By this a major drawback as studied in the objectives is over come which point the thickness after the threads are made is maintained equal to the thickness of the pipe.

The pipe after designed and made the extra thickness is visible in the section view at the neck of the threading or at the portion after the threading. Another advantage of the pipe is that the outer shape of the total pipes looks equal when the pipe is shown externally. The threads cut in the thicker portion will have more grip as the thickness below the threading is maintained equal to the overall thickness of the pipe.