GRP TECHNOLOGY - valveIT srl - PRO AT FLUID · PDF file · 2017-07-12GRP technology...


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IN FLUID CONTROL

valveIT produces Custom Designed GRP pipes, fittings and spools suited for both aboveground and underground applications.

valveIT provides System Solutions for its varied customers.

Main applications are in the Industrial Sector (power generation, chemical and desalination plants, oil&gas production, utilities, marine/offshore, deep water wells, etc.) where corrosion resistance and performance together with ease of installation is required.


GRP technology

Alkyl chloride

Ballast water and piping

Boiler feed water

Brine

Condensate

Cooling water

CO2

Drains

Emulsions (oil and water)

Inert gas

Injection water

Fire water

Formation water

Fuel

Fresh water

Gas

Glycol

HCL

Jet-A fuel

Mogas

Oil

Oil plus associated gas

Potable water

Process water

Produced water

Sea water

Service water

Sewer (grey water)

Sewer (red water)

Shallow gas

Sodium hypochloride

Sodium hydroxide

Unstabilised oil

Waste water

Vents


typical GRP applications

DN 200 / PN 60

DN 400 / PN 40

DN 1000 / PN 30

DN 2000 / PN 16

DN 3000 / PN 10


current experience envelop PN/DN range of GRP piping

Resin type Temperature

Vinylester 95 °C

Bisphenolic 90 °C

Isopolyester 65 °C

Orthopolyester 45 °C


temperature operative range


resins regression lines

PPW : pipe without sand

PPS : pipe with sand

PPG : gravity pipe

PPM : marine pipe

PPR : ribbed pipe


dual helix filament winding


discontinuous F.W. machine

GRP pipes wall consists of three layers perfectly adherent one to the other and each having different

characteristics and properties according to their function.

Liner or chemically resistant layer The liner or chemically resistant layer is manufactured using vinylester/polyester resin reinforced with glass fibres. The liner is in contact with the conveyed fluid and guarantees the resistance to chemical corrosion due to the fluid and increases the characteristics of impermeability of the whole pipe. It is smooth without defects, cracks or delaminated zones that reduces to minimum the fluid head losses and pumping head losses, and furthermore reduces to minimum the growth of algae or of mineral deposits.


pipe wall structure



Filament or mechanical resistant layer The filament wound layer confers the mechanical resistance to the whole pipe against the stresses due to all design conditions (internal and/or external pressures, vacuum, flexural stresses due to the external loads of earth and traffic load, etc.) and also against the loads due to transports and laying operations. The filament layer is obtained by applying, on the partially cured liner, continuous strands of glass filament roving, impregnated with vinylester/polyester resin, wound with a selected angle and under a controlled tension, according to the "Dual Helix Filament Winding" technique. The thickness of the mechanical resistant layer varies according to the pipe’s specific design conditions. No silica sand is included in the mechanical wall.


pipe wall structure



Gel coat or external layer

The gel coat is the external layer of the pipe. This has a thickness of not less than 0.2 mm as requested by

specifications and consists of a layer of resin, which guarantees the complete impregnation of all peripheral

fibres.


pipe wall structure

Restrained joints

B/2RLJ

Butt & strap

Flanged

Adhesive

Unrestrained joints

B/2R

Mechanical coupling

Sleeve joint (2)

B/T (Reka gasket)


joints types

The laminated butt and strap joint is applied to connect pipes to The lamination is obtained by applying glass mats and woven roving or coupled glass, resin impregnated, alternately wound by means of the “hand lay up” technique around the ends of pipe and/or fittings suitably bevelled at the ends.

Butt and strap joint allows for fabrication of spool on site and also for possible modifications or adjustment of the lines.

Thrust concrete anchor blocks at elbows and reducers are not necessary except for stress analysis requirements if any. fittings and fittings to fittings in fabricated spools. The activity can be carried easily both at shop and on site.


butt and strap lamination


butt and strap lamination without putty for DN <600


Butt and Strap Lamination with putty for DN >=600

Flanges are fixed integral type and are drilled according to ANSI B16.5 / B16.47 Series A Class 150# rating according to piping class specification.

Flanges are produced by hand lay up techniques by applying, on moulds, layers of chopped strand mats, woven roving and/or coupled glass, impregnated of resin. This operation is repeated until the required thickness is achieved.


fixed flange and loose flange


fixed flange and loose flange

Elbows up to ND1000 included and reducers are produced by hand lay up techniques by applying, on moulds, layers of chopped strand mats, woven roving and/or coupled glass, impregnated of resin. This operation is repeated until the required thickness is achieved. Radius of elbows is R = 1,5 diameters.

ND

L

L

90°

R=1.5ND

t

ND

L

45°

L

R=1.5ND

t

DN

1

DN

2

L

t

DN

1

DN

2

L

t


fittings (elbows – reducers)

TYPE “A” TYPE “B”


branch Joint

TYPE “A”: with integral sleeve reinforcement, surrounding all the main pipe. TYPE “B”: with pad reinforcement.

Spool prefabrication will be carried out by means of butt & strap joints (laminations) in the factory workshop according to the isometric drawings received from Customer or prepared from our engineering office.


spool prefabrication


spool prefabrication

Some of the customers supplied by valveIT:

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references


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Notes

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GRP TECHNOLOGY - valveIT srl - PRO AT FLUID · PDF file · 2017-07-12GRP technology...

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