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Variety of PPR Pipe and PPR Fitting
articles. Topics ranging from pipe networks to plastic pipes and many more. |
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In Pilsa ’Total Quality Control’ perceptive is taken as a principal while performing the mission. Our main policy is to provide the present and future needs and demands of our customers in the most economic way and on time.
In all our processes, we adopt in the principle of customer oriented understanding, aim for improvement and full participation of our staff
In this process management, our main goal is to continuously improve our production and to respond the demands of our customers, personnels, suppliers and shareholders
One of the important applications of random poly(ethylene propylene) copolymer (PPR) is the production of hot water pipes. The pipes can be used under hydrostatic pressure as well as at elevated temperatures up to 70 °C continuously for 50 years and at short time at 80 °C. If a pipe is used at higher temperatures for longer times it could fail earlier. Knowledge of usage time and temperature is vital for determining the origin of a failure of PPR pipes. Several techniques are used for determining changes in chemical and physical structures upon long-time annealing of PPR pipes at different temperatures. Techniques, which are sensitive to thermo-oxidative degradation of PPR and consumption of stabilizers, are not very sensitive for determining storage time longer than one year. The molar mass of PPR does not change upon long-time annealing. It is shown that crystallinity of the samples, as determined by wide angle X-ray diffraction (WAXD), is not largely affected by storage time at elevated temperatures. It is also shown that onset of melting, as measured by differential scanning calorimetry (DSC), increases with increasing storage temperature, which is apparently caused by the perfection of crystalline structure at higher temperatures. Onset of melting allows determining the maximum storage temperature of PPR pipes. It is shown that proton solid-state NMR transverse magnetization (T2) relaxation analysis is the most sensitive tool for determining changes in PPR samples that are caused by storage time of PPR pipes under hydrostatic pressure. The method provides information on molecular mobility and phase composition of PPR samples. Four different phases are analysed with this method: (1) crystalline phase and rigid fraction of the amorphous phase, (2) semi-rigid crystal-amorphous interface, (3) soft fraction of the amorphous phase and (4) rubbery-like material. The most pronounced changes upon long storage time are observed for the rigid fraction of PPR (fraction 1). This suggests that long time annealing of the samples at temperatures far above Tg (about 0 °C) results in (1) perfection of existing crystals and the formation of new crystals, which act as physical junctions leading to immobilization of the amorphous phase, (2) chain elongation in the amorphous phase due to creep under hydrostatic pressure, and (3) an increase in the gradient of concentration of ethylene-rich chain fragments through the mobile fractions of the amorphous phase. All these changes cause embrittlement of the samples. Thus, the combination of DSC and solid-state NMR measurements is a powerful tool for determining the critical time and temperature conditions causing breakage of PPR pipes and fittings.
Keywords: Proton solid-state NMR relaxation; The phase composition; Molecular mobility
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Quality of OSN
Product Testing & Quality Control
The company is maintaining a high and consistent quality standard with help of a modern laboratory having all latest testing equipments.The Quality tests are being conducted by highly skilled & trained technicians. The following reference standards are being used for testing & inspection:-
IS 15801 : 2008Â Â Â Â Â Polypropylene-random copolymer pipes for hot and cold water supplies.
DIN 8077Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Polypropylene (PP) pipes Dimensions.
DIN 8078Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Polypropylene (PP) pipes; General quality requirements and testing.
DIN 16962 Part 5- Pipes joint assemblies and fittings for (PP) pressure pipes
General quality requirements and testing.
Part 6- Pipes joint assemblies and fittings for (PP) pressure pipes
Injection moulded Elbows for soket welding.
Part 7- Pipes joint assemblies and fittings for (PP) pressure pipes
Injection moulded Tee pieces for socket welding.
Part 8- Pipes joint assemblies and fittings for (PP) pressure pipes
Injection moulded Sockets and caps for socket welding.
Part 9- Pipes joint assemblies and fittings for (PP) pressure pipes
Injection moulded Reducers and nipples for socket welding.
Part 10- Pipes joint assemblies and fittings for (PP) pressure pipes
Injection moulded Fitting for but welding.
IS 2530 : 1963Â Â Â Â Â Â Â Methods of test for polyethylene moulding materials and polyethylene compounds.
IS 9845 : 1998Â Â Â Â Â Â Â Methods of analysis for determination of overall migration of constituents of plastic
Materials and articles intended to come into contact with foodstuff.
IS 10909 : 2001Â Â Â Â Â Positive list of constituents of polypropylene and its copolymers in contact with
Foodstuffs, pharmaceuticals and drinking water.
IS 10910 : 1984Â Â Â Â Â Specification for polypropylene and its copolymers for its safe use in contact with
Foodstuffs.
IS 10951 : 2002Â Â Â Â Â Â Â Â pharmaceuticals and drinking water.
IS 12235 : 2004Â Â Â Â Â Â Â Â Polypropylene materials for moulding and extrusion.
Thermoplastic pipes and fittings –
Methods of tests:-
Part 3Â Â Â Â Â Â Â Â Â Â Test for opacity
Part 5Â Â Â Â Â Â Â Â Â Â Â Longitudinal reversion, Determination methods.
Part 8Â Â Â Â Â Â Â Â Â Â Resistance to internal hydrostatic pressure. Resistance to internal hydrostatic
Pressure at constant internal water pressure.
Part 14Â Â Â Â Â Â Â Â Â Â Determination of density / relative density (specific gravity).
IS : 13360Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Plastic methods of testing :
Part 3          Physical and dimensional properties, Determination of density / relative density Of non –cellular plastics.        Â
Part 4          Rheological properties, Determination of melt mass flow rate (MFR) and the melt        Â
Volume flow rate(MVR) of thermoplastic.
Part 5Â Â Â Â Â Â Â Â Â Â Mechanical properties, Determination of charpy impact strength.
The Testing Procedure involves:-
- Raw material inspection & control : Melts flow index of basic raw material.
- Controls during the production process : Visual appearance and dimensions.
- Inspection & testing of final Products : Products are tested for the following:
3.1 Pipes
a. Visual appearance and surface finish
b. Dimensional checks
c. Internal hydrostatic Pressure test/ Internal Creep Rupture test
d. Impact strength (Charpy pendulum impact test)
e. Reversion Test
f. Effect on water test
g. Density
h. Melt Flow rate
I. Thermal stability by hydrostatic pressure testing
j. Opacity
3.2 Fittings
a. Visual appearance and surface finish
b. Dimensional checks
c. Internal hydrostatic Pressure test/ Internal Creep Rupture test
d. Reversion Test
e. Effect on water test
f. Density
g. Opacity
3.3 Pipe Line Assembly
a. Hot and cold water cycle test
b. Fusion compatibility of pipes & fitting
URO- ALLWIN Â
RESISTANCE TO ULTRA VIOLETS (UV) RAYS :
URO ALLWIN  PP –R pipes & fittings are having sufficient U.V. stability in order to protect them from UV rays during storage in open air for a period of about 6 months. However , it is not advisable to use these pipes and fittings under direct sunlight continuously. The pipelines outside the building should be laid in sanitary ducts. If exposed to direct sunlight than it should be covered with proper isolating material, such as elastomeric nitrite rubber and U.V. protection tapes.
RESISTANCE TO SCALING :
Due to the unique feature of extremely smooth inter surface , non polar nature of the material and its low surface energy, lime stone or other deposits cannot form and hence there is no scaling or blockage in the pipelines, throughout the life of the piping system. This system is free from encrustation.
RESISTANCE TO FIRE :
URO ALLWIN  PP –R pipes & fittings are have combustion point 330* C & burning point #^)* C. These conform with B2 class fire requirements of normal combustibility according to DIN 4102. On fire, PP-RC pipes & fittings emits carbon dioxide and water. Other than this, carbon monoxide gas , molecular hydrocarbon and oxidation products of these are also emitted in proportion to the availability of oxygen. Even if the fire is incomplete, the materials emitted are less poisonous than wood or similar materials of fire under the same conditions.
RESISTANCE TO FROST:
Because of low thermal conductivity and typical elasticity of PP-Random, this system is most suitable for such application where fluids freeze. This system can be used up to -5* C . However, at lower temperature of 0* C and below, the flexibility of PP-R pipes reduces and impact strength also reduces. This makes pipes more prone to mechanical damages against impact loads. To avoid the damages at low temperature, it is advisable to insulate the pipe lines.
RESISTANCE TO CHEMICALS :
URO ALLWIN  PP –R pipes & fittings are resistant to most chemicals. This detail is given in the chemical resistance charts in following tables :
What is PPR : PPR is a thermoplastic polyolefin which is easy to process into pipes & fittings with superior chemical & physical properties.
Why we need PPR : They are Best carriers of potable water (both Hot or cold) in domestic as well as in industrial application in terms of quality and price.
When we need PPR: When long- term performance under adverse conditions without deviations in standards is required.
Where we need PPR : Areas of Plumbing/Water tight systems/corrosion resistance/No encrustation tendency/Noise dampening plastic material/Long term pressure resistance applications.
Advantages of PPR Pipes :
· Resistance to abrasion and corrosion
· No corrosion by acid and alkaline fluids with pH values between 1 and 14
· High chemical resistance
· Excellent ESCR – Longer life
· High abrasion resistance => high flow velocities possible
High internal pressure resistance
· Minimum 50 years life time at 60 or 70°C and 10 bar maximum pressure
No negative influence on water quality
· Compliance with the international standards on the use of plastic materials for the transportation of drinking water.
Prevents UV passage – prevents growth of bacteria & algae
Very smooth surface of pipes and fittings
· No lime stone or other deposits
· Head loss / pressure drop reduced to a minimum
Welding capacity
· 100% homogeneous connections, guaranteeing leak-tight, long lasting system
· fast and easy installation
Threaded insert fittings
· Watertight assemblies with other metal elements in the installation
Silence / sound absorption
· Considerable noise reduction in comparison to metal
Low specific weight
· Easy transport and handling
· Lowest density as compared to conventional metal pipes
Energy saving
· Low heat conductivity of PP-R leads to 10-20% energy saving
Reduced Condensation
· Low heat conductivity reduces the condensation of water on the outer surface of cold water pipes
Resistance to stray currents
· PPR has a low electrical conductivity perforation phenomena caused by stray currents are unknown
Fitness for use in seismic areas
· Flexibility and toughness of the PP-R pipes allow their use also in seismic areas
Applications of PPR Pipes :
· Hot and cold water supplying pipes
· Sanitary lines
· Water lines
· Water purifying plants
· Lines for conveying liquid food products
· Industrial systems like : conveying air pressure, aggressive fluids like acids, alkaline solutions
· Pipes for Agriculture use.
· Radiator heating pipes.
· Under floor heating pipes
Precautions of PPR Pipes :
Transport & Handling
· The products should be handled with normal care. Pipes and fittings with imperfections should not be installed.
Exposure to UV Rays
· It is recommended neither to store nor to install the product in places which are directly exposed to UV rays.
Bending
· Large bends can be obtained by cold forming. If the bend radius is shorter than 8 times the dia of the pipe, it is recommended to heat up the part concerned by means of a hot air blower.
Threaded Joints
· To ensure tightness, Teflon or similar products can be used.
Thermal Expansion
· The thermal expansion of plastics is higher than that of metals, hence the length expansion compensation should be considered.
Welding
· Only chemically similar materials are supposed to be welded. Thus Polyethylene and polypropylene should not be welded. For the same material, the products to be welded should have approximately the same fusion index.
Support
· The PP-R pipes are not self-contained so it is necessary to support them at specific distances.
Pipe Cutting
· Cuttings should be carried out using tools which ensure a clean cut free from burrs and perpendicular to the axis.
Low temperatures
· At temperatures below 0 deg C, following precautions should be taken :
· Pay attention when cutting the pipe,
· Check the cut made,
· Avoid impact and excessive strains,
· Not to make elbows with vary narrow radius.
· In presence of cold draughts, welding must be carried out in protected areas, to avoid a quick cooling of the surfaces to be welded.
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