uPVC Pipes

Rolex PVC Pipes uses the best quality resin and compound which results in the best physical properties and is maintained in every production run. A well trained and highly skilled staff is employed to check and maintain a strict quality control at each step of pipe manufacturing process such as material formulation, mixing and extrusion. A well-equipped laboratory is engaged round the clock to control the quality of the product at each stage of pipe production. Rolex PVC Pipes has wide range of products in PVC for different usage as below.

Rolex PVC Pipes are Applicable for

• Water supply
• Pressure piping systems
• Vent & Drain system
• Irrigation
• Potable water supply
• Industrial piping for chemicals
• Electrical Conduits & Sewerage

Advantages of Rolex PVC pipes

Rolex PVC pipes has technical advantage over other systems

Strength

• . Rolex PVC pipes are highly resilient, tough and durable with high tensile and impact strength. Besides that they are five times lighter in weight as compared to other systems. Non Corrosive & Non toxic.
• • Rolex PVC Pipes are designed for domestic water applications. The standard ensures the safety of products coming into contact with water.
• • With many other slight corrosion may occur which result in the odor and taste of water but with the Rolex PVC Pipes there is no corrosive by products, therefore no contamination of the piped fluid.

Low friction loss

• • Rolex PVC Pipes has smooth surfaces inside and outside which results in high flow rates of the fluids, since they are resistant to rusting, pitting, scaling and corrosion, the high flow rate can be maintained for the life time of the piping system.

Fire resistant and low thermal conductivity

• Rolex PVC Pipes does not support combustion and had very negligible thermal conductivity. Therefore fluids being piped maintain a more constant temperature and no insulation is required.

Cost effective and maintenance free

• Rolex PVC Pipes are extremely light weight, convenient to handle, relatively flexible, and easy to install. These features lead to lower installed cost than other piping system.
• Once PVC system is properly selected, designed and installed, it is virtually maintenance free. Therefore years of trouble free service can be expected when using Rolex PVC pipe system.

Standards of Rolex PVC Pressure and Non-Pressure u-PVC Pipes
For Pressure Pipes:
(For Cold Potable pipes)         1.BSS 3505 B, C, D & E
                                                2. PS 3051-91
                                                3. Sch: 40, Sch: 80
                                                4. DIN 8061 & 8062
 For Sewerage and Vent Pipes:

1. ASTM D 2665 & ASTM D1785

 
For Electrical Conduit:
1. BSS 6099
2. ANSI/UL651

Range of Rolex PVC Pressure and Non-Pressure U-PVC Pipes
Nominal Diameter: From 2” to 10”
Rolex PVC Pressure and Non Pressure Pipes are available in any length Provided that the order is not less than 200 meters. The Pressure Pipes are supplied in Plain and socketed ends.
Table 1: Pipe Dimension for Class B, C, D & E

Sewerage and Drainage Pipes

Rolex Sewerage and drainage pipes can be used for the following purposes

• Sewers and underground building drains for home and industry
• Storm sewers for home and industry
• Disposal fields for septic tank drains and leaching systems
• Subsoil drains for lowland and surface water drainage
• Sewer mains and sewer service

Rolex Electrical Conduit Pipes

Rolex electrical conduit pipes are the state of the art PVC pipes for electrical installation inside ground and in open atmosphere. Rolex Schedule-40 and Schedule-80 is sunlight resistant. Meets or exceeds the requirements of NEMA TC-2 and UL-651.

Fluid Flow Properties

Fluid flow rate
Calculations of volume flow rate for PVC pressure and Non-Pressure Pipes
Q= aV where
a=cross sectional area of flow, ft2.
V=Flow velocity, ft/sec
Q= Volume flow rate, ft3/sec
For pipe with velocity given, the volumetric flow rate can be calculated as
Q=aV……… (1)
2” Schedule 40 Pipe with fluid velocity
V=2.9 ft/sec…. (i)
Di= inside diameter of pipe in inches
A= ∏di2/4=3.14(2.06712)2/4=0.0233ft2…….. (ii) Putting (i) & (ii) in equation (1)
Q=0.0233×2.9=0.0676ft3/sec
Q=0.0676ft3/sec ×7.48 gal/ft3×60 sec/min=30 gals/min

Pressure Flow in PVC Pipes

The Darcy-Weisbach equation is considered to be the most accurate model for estimating frictional head loss for a steady pipe flow. Since the Darcy-Weisbach equation requires iterative calculation an alternative empirical head loss calculation like the Hazen-Williams equation may be preferred:
h = 0.2083 (100 / c) 1.852 q1.852 / dh4.8655                          (2)
Where
h = friction head loss in feet of water per 100 feet of pipe (fth20/100 ft pipe)
c = Hazen-Williams roughness constant(C=150 for PVC Pipe) q = volume flow (gal/min)
dh = inside hydraulic diameter (inches)
If the flow is transient - 2300 < Re < 4000 - the flow varies between laminar and turbulent flow and the friction coefficient is not possible to determine. The friction factor can usually be interpolated between the laminar value at Re = 2300 and the turbulent value at Re = 4000.
Re=Reynolds Number

EARTH LOAD

The load of backfill acting upon a buried pipe is calculated from the empirical formula of master and Anderson:
PE = Cd, V B------------------------- (3)
CD = (1-e (-2k tan θ). H /B) / 2k tan θ
K = 1-Sin θ /1+Sin θ
Where,
PE = Static earth load, in Kg/cm2
V = Specific weight of backfill, in Kg/cm3 (Normal soil = 0.0018 Kg/cm3)
H = Depth of cover, in cm  
θ = Angle of repose of soil, in deg. (Normal soil = 40 deg.)
B = Width of trench, in cm.

WHEEL LOAD

Kogler formula is used to calculate the wheel load when loads such as those of trucks act upon a buried pipe:
Pt = 2w t (1+i)/(a+2H)(c+b+2H)--------------------(4)
Where:
Pt = Wheel load, in Kg/cm2
i = Impact coefficient (normally 0.3)
Wt = Load per wheel, in Kg
a = Length of wheel in contact with ground, in cm
b = Width of wheel in contact with ground, in cm
c = Distance between wheels of two parallel trucks, in cm
H = Depth of cover, in cm

COMBINED EXTERNAL LOAD

Combined external loads acting upon a buried pipe are expressed by:
P = PE + Pt
Where P = Combined external load, kg/cm2
PE = Static earth load, Kg/cm2
Pt = Wheel load, Kg/cm2

ELONGATION & CONTRACTION OF PVC PIPES

OPEN PIPING
In case of open piping the elongation and contraction should be studied by the following relation:
dL = a L. dt--------------------------(5)
Where:
dL = Length of elongation or contraction, m
a = Coefficient of linear expansion per ˚C (PVC) Pipe = 7 x 10(-5)/ ˚C
L = Length of piping in m
dt = Temperature difference, in ˚C

Measure the maximum and minimum atmospheric temperature and the maximum and minimum water temperature. Then take the highest and the lowest temperatures of the four. The difference between these two should be used.

BURIED PIPING

Each temperature varies throughout the day or the year due to atmospheric temperature and sunlight. The earth temperature at 0.6 to 1.2-m. depth is nearly equivalent to mean monthly temperature and that to around 10 m. depth to mean annual atmospheric temperature. Therefore, PVC pipes installed underground are subjected to extremely small temperature fluctuations. The elongation and contraction owing to temperature fluctuations is inhibited by the friction force developed between the pipe and soil and is built up in the pipe as thermal stress. This obviates the need for providing a remedy for elongation and contraction.
The thermal stress is computed by:
h = a.E. dt--------------------------(6)
Where:
h = thermal stress in Kg/cm2
a = coefficient of linear expansion per degree ˚C.(PVC Pipe = 7x10(-5)/ ˚C
e = Young’s Modulus in Kg/cm2
dt = temperature difference in ˚C

WATER HAMMER

Pressure increase by water hammer is given by:

P = C.V. g
Where:
P = head of increased pressure, in m.
C = velocity of pressure propagation, in m/Sec
V = velocity of flow in pipe before valve operation in m/Sec
g = acceleration due to gravity, (9.8 m/Sec2)

Laboratory Testing

Rolex PVC Pipes industry has the state of the art PLC laboratory in which following tests are being carried out on regular basis by qualified and skilled personnel in order to ensure the quality of pipes round the clock.

• Methylene test
• Heart Reversion test
• Impact test
• Fracture toughness test
• Opacity test
• Specific gravity test
• Hydrostatic pressure test

Storage and Transportation

In storage of Rolex PVC Pipes it’s taken care of, that each and every stack has its own support which provide adequate support to the every category of pipes i.e. Belled ends, pallets etc. Our storage is also protected from the harsh weathers of thunder lights, rain and sun.