Are GRP and PFVF pipes similar?

Yes they are the same, the difference is that one of the acronyms is in English: Glass Reinforced Polyester (GRP) and the other one in Spanish: Polyester Reforzado con Fibra de Vidrio (PRVF)

Is GRP piping flexible?

Yes the glass fiber reinforced polyester pipes are part of the flexible piping family.

Flexible piping has the capacity to deform diametrically and form a ground-pipe structure. The PVC, PEAD, GRP, steel are flexible.

Is a welded joint system more reliable than one with synthetic rubber gaskets?

No. Both welded joint systems as elastic systems (with synthetic gaskets) have certain characteristics that must be met to perform correctly and both systems are designed and tested.

In the case of welded systems must be taken into account climatic conditions, side cleaning etc. The elastic REKA joints are approved based on extreme conditions of strength, shear, angle, unplug etc.

What is the relationship between thickness and strength?

In composite materials, there is no direct relationship between thickness and strenght.

In composite materials is necessary to know for example the structural thickness and elasticity module in tension, and with this parameters several structural verifications could be carried out.

Do all types of pipes need compaction or is it only GRP?

All types of piping need a certain type of conditioning and compaction. The PVC, PEAD, GRP, steel pipes are flexible pipes and are calculated with the help of the ground that surrounds them. In the case of rigid pipes as the ones made of concrete, equally, different types of fillings and compaction and are considered to be able to materialize the different types of support, foundation and stability.

What is the difference between the installation of flexible piping and other materials?

Generally, calculation indicated installations, by traditional literature as the AWWA manuals’ examples, indicate substantially similar installations for various types of flexible pipes (which respect a minimum transverse stiffness).

Is the trench width different for the different materials (and same diameter)?

About the trench with, it must generate the space for a right filling compaction and also form the structure ground-pipe that is generated by all flexible pipes. This is why flexible piping trenches width its substantially similar. In the case of rigid concrete pipes due to its important with and flare is common to make wider trenches to be able to make the right filling to achieve the right wedging degree.

Why do O-tek pipes have a 12 meter maximum length?

This is the length that can be carried by a truck or standard trailer without any type of special permit. Besides, the length allows inexpensive installations of great performance.

Are plugging times a critical activity within the work periods?

The plugging times in the O-tek piping are not part of a critical activity. Important properties such us unit length, low weight, easy connection system, etc. allow for a quick and easy installation.  The activity that commonly forms the critical path is the excavation of the trench.

Is there a difference between a joint system and belll Spigot system?

Among flexible joint systems, coupling or joint, spigot-spigot and spigot-bell systems are very used. The REKA coupling is used with Flowtite pipes, it makes the hydraulic seal through an elastomeric gasket wedge shaped with multiple lips.

This allows both a hydraulic seal by the deformation of the gasket and by its shape wich fluid presses against its lips generating a better performance. Gasketed closures of circular cross section – O ring – generate pressure on the gasket by closing, besides being sensitive to that thread can generate rubbers. "bites". To control this, is coming for O-ring closures the installation of a double gasket, generating an intermediate chamber that allows through the application of low-pressure, to ensure that they are not spinning.

Are GRP pipes suitable for drinkable water transportation?

They GRP Flowtite pipes are commonly used for the transportation of drinkable water, counting with specific approvals in the most diverse countries around the world. (Toxicity test)

Are GRP pipes fragile?

The Flowtite GRP pipes are not fragile. They present a very important resistance to the diverse solicitations, they accomplish widely the most diverse international standards, being flexible adoptable through controlled deformations interacting with the ground around them, they are utilized in highly seismic regions.

Can the pipe be installed in the air?

That GRP Flowtite pipes can be installed underground, in the air, and under water. There is an important quantity of aerial projects where typical properties from piping are taken into account, such as low weight, adaptability to the most varied landscape (steep hills), resistance to vacuum pressure, corrosion resistance, etc.

What is the effect of UV rays on the GRP pipe?

UV rays produce a color change on the surface of GRP pipes and no evidence of alterations to the mechanical properties. Inhibitors might be used to delay, or paints, for example with Top-coats to present a surface with an aesthetic appearance which is Maintained over time.

How are the GPR accessories manufacturing process?

The GRP Flowtite accessories are generally manufactured by a cutting technique of sections and laminated pipes( fiber glass + resin). This methodology allows a wide variety of accessories that can adapt to the project, generating a great advantage for the system designer. Great examples are the curves that are manufactured at any angle without needing to be restricted to determined angles manufactured by molding technique.

What is the manufacturing process of the Flowtite pipes?

The GRP pipes are in general manufactured by three methods. Filament winding, on continuous advancing Mandrel, continuous rolling over a mold and centrifuged (spinning). Flowtite pipes are manufactured by the filament winding process on continues a balancing mandrel, this being the most common method for the production of large diameters and substantial lengths.


For which applications is the tank recommended?

Epoxy bolted tanks with steel frames are particularly specified for storage of both raw and potable water, and other applications in the treatment of effluents or sewage, and even oil products. They can also be used in other applications such as storage of grains, cement, and other solids.

Can the storage capacity be increased?

Yes, the storage capacity can be increased gradually if it was considered this way by the initial design. The capacity increase is based on greater height adding additional rings at the top of the tank.

Can it be transported?

The epoxy bolted thanks are totally removable, which makes possible their transportation.

How long does it take to install a 2.000mtank? And a 10.000mtank?

The installation of a 2000 m³ tank could demand around 30 days, when it comes to a 10,000 m³ tank is feasible to be mounted in 60 days.

What kind of bottom is used and how is the union with it the tank?

Depending on the need, the floor of the tank might be the same material, epoxy resin reinforced with the steel frame or concrete in which case the first ring is embedded in the same concrete slab.


In which situations is recommendable to use these methodology?

Wherever the piping diameter could be reduced (because of the couplings bigger diameter).

On what does the length of the pipe to be inserted depends? Could it vary?

It generally depends on the installation conditions, surroundings, available equipment and other building factors that need to be analyzed on each particular case.


Is it a new technology?

The CIPP methodology, was created in 1971 by engineer Eric Wood from the United Kingdom then a trial phase, in the year 1977 this methodology of trenchless rehabilitation, was introduced in the United States and was widely accepted worldwide. 

Does it work for potable water piping?

Yes, this piping rehabilitation method is used for sewage and also for raw or potable water piping with or without pressure.

What about the flow and that rehabilitated pipe connections?

They diameter decrease obviously decreases the transporting section but a smoother lower new surface translates into lower pressure drops, this is why the difference in loads is not significant the flowtate might even be higher after rehabilitation.

As for the connections, these can be reconstructed by robots with special tools from inside the pipe itself.

Can a pipe with infiltrations be rehabilitated?

Of course. Is only needed to bring down the water flow level and/or stop the infiltrations to be able to implemented rehabilitation methodology, preliner on the sleeves can be used when stopping the dripping is impossible.

How long does the curing cycle take?

It depends on the curing method, (vapor, hot-water, ultraviolet light), the diameter of the pipe, the curing time could vary between 5 to 30 hours.

CCTV - Pipeline inspection

Do any standards apply in the elaboration of the inspection report?

When it comes to video inspection and diagnosis of pipes is commonly use around the world the standard codification of PACP (pipeline assessment and certification program), developed by NASSCO and Walter research center (WRC).


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