Faqs of MLC Pipes

Jindal MLC Pipes (Generic Name Pe-Al-Pe Pipe) are made of five layers. The inside & outside layers comprise of HDPE (High Density Polyethylene) tightly bonded with melt adhesives to intermediate layer of Aluminum Core, which is longitudinally overlapped. These Pipes offer the advantages of both metal and plastic pipes with none of their shortcomings.

PE is a semi-crystalline thermoplastic material and one of the most commonly used plastics. HDPE is the high density version of PE plastic which is harder, stronger and a little heavier than other variant of PE, but is less ductile.

After extrusion of internal and external layers of PE material together with melt adhesive, the tube function as single component for operating in temperature range of -20°C to 95°C and there is no differential expansion of PE layers and aluminum tube. Because of aluminum in between, the resultant thermal expansion coefficient is low. It also sustains more pressure because of aluminum core inside.

The working Life of Jindal MLC pipes is more than 50 years.Because the internal surface of the Jindal MLC pipes are smooth, the flow rate of fluid is in these pipes is 30% more than GI Pipes 

Jindal MLC Pipes are bendable and hence require less number of fittings 
Jindal MLC Pipes & Fittings are hygienic, toxic free and have no growth of micro organism.
Jindal MLC Pipes are Light in weight and come in Coils of 200/100 Mts. lengths, therefore they are Easy to Carry & Store and require minimum joints. 
Jindal MLC Pipes are Corrosion Resistant and Scale Free.

Jindal MLC Pipes can be used for variety of Applications such as: 
Cold and Hot Water Supply 
Solar Water Heater System 

Piped Gas Distribution 
Compressed Air Lines for Industrial Applications, 
Under Floor Heating Systems 
Medical, Foodstuff and Chemical Industry’s Pipe System

Jindal MLC Pipes can be used for Hot Water application up to 95°C. UV stabilized pipes are also available for external installations exposed to Sun. These Pipes are “Black” in color. Jindal MLC Pipes come in five types: 

White - Pipe A - For Cold Water Supply -20° C to 60° C, 
Orange - Pipe B - For Hot Water Supply -20° C to 95° C, 
Yellow - Pipe C - For Gas Supply -20° C to 50° C, 
Blue - Pipe D - For Compressed Air Supply -20° C to 60° C, 
Black - Pipe UV - For External Use (Both Hot & Cold) -20° C to 95° C,

Jindal MLC Pipe is bad conductor of heat. Hence the insulation thickness required is less as compared to metal pipes. Approximate equivalent insulation thickness can be calculated as follows: 

The outside diameter (OD) of insulation pipe in case of Jindal MLC Pipe will be 60% of the OD of insulation pipe required for equivalent metal pipe. Thus, for example, for 0.5 inch NB GI pipe if the insulation pipe OD is 100 mm, 60 mm OD insulation pipe for 1216 Jindal MLC Pipe will give the same results.

In case of concealed piping, it is recommended not to provide any insulation. In case of metal pipes, the insulation is provided for following reason: As the conductivity of metal pipes is very high as compared to tiles/plaster covering the pipe, the differential temperature leads to discoloration of tiles. In many cases, this may lead to cracks in the wall. 

Hence, some insulation is required to be provided. In case of Jindal MLC Pipe pipe, due to low thermal conductivity, this phenomenon does not occur and hence insulation is not required to be provided.

Jindal MLC Pipes come in size range 1014 mm (10mm Internal Diameter and 14mm Outer Diameter) to 4150 mm (41mm ID and 50 mm OD.)

We supply complete range of Fittings with our Pipes which can be broadly classified into Screw Fittings and Press Fittings. Following are the type of fittings available: Brass-fit (Screw fitting) 

Com-fit (Screw fitting) 
Crimp-fit (Press fitting)

These fittings do not require any special tool. The pipe joint is achieved by tightening the nut against the coned shaped olive, the profiles of the two pieces are designed to cause a progressive shrinkage of the cone olive and distribute the compression force across the entire contact surface. These fittings can be unscrewed and reused in case of any change in the installation layout.

All kind of fittings are available as per requirement. It can be Equal Elbow, Unequal Elbow, Male Elbow, Female Elbow, Equal Union, Unequal Union, Male union, Female Union, Equal Tee, Unequal Tee, Female Tee; Male Tee etc These fittings are compatible with all kind of fixtures.

These fittings require a Pressing Machine with suitable jaws. The Machine presses the outer sleeve of the fittings and creates dents in the sleeve which comes in contact with the O rings and creates leak proof joint.

A range of fittings are required in a Plumbing system, which may vary in every individual Project. All kind of fittings are available as per requirement, i.e., Equal Elbow, Female Elbow, Equal Union, Unequal Union, Male union, Female Union, Equal Tee, Unequal Tee, Female Tee etc. These fittings are compatible with all kind of fixtures and can be used to connect with other Piping Systems also.

The tools required for Jindal MLC Pipes are Cutter, Reamer, Bending Spring and Spanner. In case of Press Fittings, along with the above-mentioned Tools a Pressing (Crimping) Tool and its Jaws will be required. For bending of long pipes, Bending machine is also available.

The Prices of Jindal MLC Pipes are less than GI Pipes by 10-15 percent, if Com-fit or Crimp-fit Fittings are used. However, with Brass Fittings the overall cost of the installation may be equal compared to GI Pipes. But the Working Life of Jindal MLC Pipe System is over 50 years, in comparison to 8-10 years of GI Pipe system, which makes Jindal MLC Pipes more Cost effective in the long run.

Jindal MLC Pipe pipe is having smooth inside surface and hence is having better flow property as compared to GI pipes. The calculations for equivalent pipe sizes are as follows: a. The graph is based on Hazen William’s Flow Equation. 

It can be seen that the flow carrying capacity of Jindal MLC Pipe is higher than equivalent GI pipe. 
The formula is as follows: 
Q = F0.54 x 1002 x C x D2.63 
Where, Q = Water Flow Rate Cubic Meter per Hour 
F = Friction drop Meter per meter 
C = Surface factor
For Jindal MLC Pipe C = 150 For GI C = 100 D = Inside Diameter of Pipe mm

The PE materials have very high resistance to ageing, if utilized at the pressures upto 10 bar and working temperature up to 95 C. Artificial ageing tests performed in the laboratory indicate that the pipe has a Working life of more than 50 years.

Yes, Jindal MLC Pipes are UV resistant. For external installation exposed to Sun, UV Resistant Pipes are available in complete Size Range (from 1216mm to 4150mm), which are “Black” in color.

The grades of Polyethylene used for Hot Water pipe and Cold Water Pipe are different. For Hot Water Pipe, the material used is PE-RT (Polyethylene – Raise Temperature), whereas HDPE (High Density Polyethylene) is used for Cold Water. Also Color Codes of the Pipes are in accordance with the International Standards, which is White Color for Cold Water Pipe and Orange Color for Hot Water Pipe.

The Co-efficient of Thermal Conductivity of Jindal MLC Pipes is 0.45 W/mk, about 1/100 that of steel pipe but it is higher than the insulating materials. Normally there is no need of using any insulating material for Hot water distribution.

Jindal MLC Pipes do not react with chemicals. Below 60° C, PE is able to stand all kinds of acid and alkali solutions. It is static resistant and thus can be used in chemical industry without extra protection. Brass fittings may not be suitable for all types of Chemicals and alkalies and will require compatibility check before installation.

Conventional PE pipes are weakened due to swelling when they come in contact with these chemicals, leading to failure of the pipe. In case of Jindal MLC Pipe, because of the bonded Aluminum tube, the swelling does not take place. Hence, Jindal MLC Pipe does not lose any strength when used for these chemicals. As Aluminum itself does not come in contact with fluid, chemical reaction of the chemicals with Aluminum is ruled out.

Only free chlorine can react with PE. Dissolved chlorine does not have any effect on PE. Hence, there is absolutely no adverse effect due to dissolved chlorine in potable water.

The bending radius may vary from 2.5 to 5 times the Outer diameter (OD) of the pipe. Once the pipe has been bent it remains in the desired position like a metal pipe

The tensile and compressive stresses developed on outermost and innermost layer of the pipe cross section, respectively, are well within the allowable limits when the bending radius is more than or equal to 5 times of OD of pipe. Hence the pipes bent within this limit are safely used without any reduction in basic strength of pipe.

The bending radius is low because of following factors: 

Resultant modulus of elasticity is higher because of introduction of Aluminium tube 
Aluminium and PE are malleable materials

There are Internal and External Springs available as tool for bending the pipes for Sizes up to 2632mm. Pipe Bending Machine is also available.

Yes, we have fittings available through which Jindal MLC Pipes can be connected with different types of Plumbing Pipes and Fittings.

There will be some friction Loss in Jindal MLC pipe due to internal fittings but the overall performance of the Piping System will be better than other Pipes as there are less number of fittings required.

Jindal MLC Pipes do not burn readily due to the internal metal layer. According to tests performed by the National Fire Proof Construction Material Quality Supervisory Test Center, the fire resistance of Jindal MLC Pipes is proved to reach grade B1 of GB 8624, which are stipulations for Wire & Cable Conduit Plastic material.

Jindal MLC Pipes come in Coil form. The length of the coil varies from 50 Mts to 200 Mts depending on the Size of the pipe. The maximum length of the installation without a joint will be the length of the Pipe Coil.

The Working pressure for Jindal MLC Pipes is as under:-

White Pipe A - For Cold Water Supply 1.0 Mpa /145 Psi 
Orange Pipe B - For Hot Water Supply 1.0 Mpa / 145 Psi 
Yellow Pipe C - For Gas Supply 0.4 Mpa / 58 Psi 
Blue Pipe D - For Compressed Air Supply 1.2 Mpa / 175 Psi 
Black Pipe UV - For External Use (Both Hot & Cold) 1.0 Mpa / 145 Psi

Yes, Jindal MLC Pipes & Fittings can be used for concealed installations. It is the perfect Pipe for concealed applications.

These pipes can be used for underground installation in Lawns and Gardens and the soil will not affect the pipes. But after the installation, care should be taken that pipes are not cut during Spading Work in the area of underground installation of pipes.

The inside surface of Jindal MLC Pipes is very smooth. In addition to this, because of inherent properties of PE, there cannot be any bonding between PE and the minerals. Hence the minerals, which are separated from the stagnant water, cannot stick to the wall of the pipe. When the flow starts again, the minerals are flown out of the piping system.

The stability and durability of Jindal MLC Pipes and Fittings are much better than GI system. GI system life is much shorter than MLC Pipes System due to corrosion effect on GI Pipes.

Jindal MLC Pipes conforms to ASTM F-1282 (American Standard) and IS 15450 (Indian Standard).

No, there is no effect of corrosive soil on Jindal MLC Pipes

Yes, Jindal MLC Pipes are suitable for Compressed Air applications. In fact, these pipes are a better alternative to traditional Piping systems being used for Compressed Air such as GI Pipes, Aluminium Pipes, PPR Pipes etc.

Yes, Jindal MLC Pipes and fittings can be used for RO systems.

Yes, Jindal MLC Pipes can be used for Solar Water Heater.

Linear Thermal expansion is approx 7 times more in PPR as compare to Jindal MLC Pipes. As a result of this PPR Pipes develops cracks in the Plaster and also results in leakages on joints. 

Hot Fusion Jointing in PPR is complicated. Pipe and fittings are to be heated precisely at 26000 C to make the joints proper. The time available to the plumber for fusion is 3 seconds. Each pipe size needs to be marked for insertion. Only experienced plumbers can do the job properly. In our case the installation is very easy and can be done by a normal plumber without any constraints on time. 
As the time available for fusion in PPR is very less and many times the fittings are not aligned properly resulting into wastage of fittings and pipes. 
PPR Pipes require electricity at the point of installation, whereas, in case of Jindal MLC Pipe there is no such requirement. 
In case of PPR, it is very difficult to work in small corners and small shafts as heating machine requires some space for heating & jointing. 
PPR Pipes burn like candle but Jindal MLC Pipes are fire resistant to an extent.

Hairline cracks develop in CPVC Pipes while lying at site in open space which widens with the passage of time resulting in leakage. 

Plumber has to wait for one joint to dry before he works for another joint on the same installation. 
Pipe lengths are small and require more number of fittings. In our case Pipes are of 200 Mts /100 Mts /50 Mts lengths. 
There are chances of leakages in joints due to hot and cold water cycle. 
The Linear Thermal Expansion in CPVC Pipes is 3 times more than Jindal MLC Pipes. 
CPVC Pipes are not 100% Food Grade, whereas Jindal MLC Pipes is made of 100% Food Grade Material. 
CPVC Pipes are not suitable for Solar Water Heaters as it can withstand temperatures upto 82 C only, whereas Jindal MLC Pipes can withstand temperatures upto 95 C and are highly recommended for Solar Water Heater Application.

As the coefficient of thermal expansion is very low, no clamping is required to arrest the expansion of the piping. The stresses are also very low (same as that for copper pipe). As Jindal MLC Pipe is totally malleable and does not have any spring back action once formed into curves, it is not required to provide any special clamping to keep the pipe in place. Considering both these points, it is not required to provide any special clamping for installation of Jindal MLC Pipe pipes in concealed installation.

Mpa (Mega Pascal) is unit of Pressure. 1 Mpa = 10 Bar = 1 N/mm2 (Newton per sq mm) = 145 Psi (Pounds per sq inch)

Jindal MLC Pipes can withstand multiple freezing cycles. Jindal MLC Pipe, being flexible, can withstand the stresses, developed due to increase in volume because of formation of ice at subzero temperature. PE as well as Aluminium does not lose any strength at sub-zero temperature upto –20° C. Hence, the recommended min. operating temperature is – 20° C. For Hot water, Jindal MLC Pipes are designed for 10 bar pressure at 60° C. For hot water application, Jindal MLC Pipe pipes are used up to 80° C temperature when the pressure is less than 4 bar. Maximum allowable short term increase in temperature is 95° C.

Because of tie layers, PE layers and Aluminium tube function as single component pipe for operating temperature range of –20° C to 95° C. This ensures that there is no differential expansion of PE layers and Aluminium tube. The resultant expansion coefficient is very low and approximately same as that of copper pipe.

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