FRP/GRP Mortar Pipe

1. The property and advantage of RPM pipe

As the RPM pipe is accompanied with sand in its structure,compared with the pure FRM pipe,it not only-has property of lightweight and high strength,but also possess high stiffness as the buried pipe and low cost.So it is welcomed from its presence.The usage in conveying water or other fluid is more and more. The relative information reported that 160 thousand kilometers long RPM pipe had been installed in America during the middle period of 1990s.In Europe,the length of new laid large and middle diameter RPM pipe for conveying water and sewage accounted for 30~50% of total installed length.In Japan,this kind of RPM pipe account for a certain share,its total installed length had exceeded the aggregate of steel pipe and concrete pipe.And in Mid-Fast area.almost all the pipes for conveying water,sewage and desalinated seawater are RPM pipe.

2. Characteristics of RPM pipe

2.1 Lightweight,high strength and high stiffness

The RPM pipe is composed of inner layer,wound layer,resin-mortar layer and exterior corrosion-resistant layer,its density is 1.7~2.1,equals one fifth of steel pipe,one fourth of cast steel pipe and three fourth of pretensioned concrete pipe(PCP).As the filament wound reinforced structure exists at the two sides of resin-mortar layer,and its fiber contedt is 70%,so it can meet the strength requirement of the pipeline.Else,as the resin-mortar layer is between the middle areas--lower stress area,so it has increased the stiffness meantine no any decrement to the strength of the pipe.

2.2 Corrosion-resistant property

The corrosion-resistant property of RPM pipe is mainly relied on the inner resin,and be selected in accordance with the condition of the media.It is adopted the reinforced rich resin layer by fiberglass,the resin content is 80%，it can ensure that the RPM pipe prevent corrosion and leakage.

2.3 Good hydraulic property

The inner surface of the RPM pipe is very smooth; the roughness coefficient is very small.Not only the inner surface of

new produced pipe is very smooth,but also it is same smooth as the beginning after has been used many years,and no seaweed

and other aquatic derivative be adhered.The water conservancy factor(C)can be kept within 140 and 150 during a long period.

After the relative testing,its friction factor(f)is 0.0009 15,it is smaller than the PCP(f=0.00232) and the steel pipe (SP)(f=0.0O 179).

It can decrease the pressure head loss obviously;capacity above 20%.So when the conveying the increase conveying capacity 1S same,can adopt the RPM pipe with lower diameter,can save the investment of the project.The conveying capacity comparison can see the following Table and Diagram.

Water head loss per 10km

2.4 Health property of RPM pipe

The main material of RPM pipe is unsaturated resin and fiberglass,are formed by a specified procedure.So its inner surface is very smooth and the stiffness is above Barcol 40,the unsaturated resin itself was passed the certification by the relative national sanitary authority and the RPM pipe also has been verified by the relative water and it has national sanitary authority.So the RPM pipe can be completely used in the conveying drinking above 20 years practical example.

2.5 Shock resistance

Since the RPM pipe is between the stiff pipes and flexible pipe,so its shock resistance property is good,it bring its breakdown and deformation will deform under the action of strong foreign force,but it will not

because it doesn't bring delamination and cracking under the condition of deformation is 25%.

2.6 Abrasive resistance

The inner surface is made of one kind of resin with high good abrasive resistance,so it can improve the abrasive resistant property of the pipe,and can pro-long the life of the product.

2.7 Low temperature resistant property

There will not be cracking under the condition of -40-Cand the strength of the RPM pipe doesn't decline.

2.8 Compliance against the environment

The RPM pipe is applicable for the different kind of environment,

such as beach,bottom of the sea,river.

Mountain area,marshland,desert and plain,etc.It has the following Characteristics.installation fast, convenient transportation and long life,etc.

2.9 Comparison with the other kind of pipe

Property comparison among the different pipes

2.10 Comparison of different kind of pipe in economy

Note:
1. The Table is calculated upon the Budgetary Standard of 2000
2.
RPM: ReinfOrced Plastics Mortar
PCCP: Pretensioned Concrete Casing Pipe
PCP: Pretensioned Concrete Pipe
SP: Steel Pipe
NCIP: Nodular Cast Irom Pipe

3. Specification of RPM pipe

3.1 Usual nominal pressure class

3.2 Usual Stifness Class

SN(N/m²)

2500N/m² 5000N/m² 10000N/m²

Stiffness SN(N/m²)

2500N/m² 5000N/m² 10000N/m²

3.3 Nominal diameter

The RPM pipe that its diameter is between DN25 and DN4000

3.4 The length per piece

It is any length Within 2 meters piece

3.5 Type of joint

The type of joint is socket-spigot with double “O”seal rings,flange joint,butt-joint and socket-pigot with adhering,etc.(The detail of the type can see illustration)

3.6 Fittings

In order to satisfy the different types of joint of pipe or pipeline, we also can produce many kinds of flanges,tees, reducers,manholes and other fittings to meet the differentstandards,such as GB,JB,HG,DIN and others.

3.7 Main mechanical property index of RPM pipe

1) Inner surface roughness coefficent:0.0084

2) Barcol hardness:>40

The special pressure class and stiffness grade can be designed especially.

Parameter of RPM Pipe

Note:The serial paramcter listed in the aove table is only applicable for water supply or drainage.Normally the pipe is not lager than DN400 doesn’t add sand.

HOT PRODUCTS

---

Pipe diameter(mm):

Quantity(m):

Medium: □Sewage, □drinking water, □corrosive liquid or gas, pls specify content _____ _____

Pressure(Mpa): □gravity, □0.6, □1.0, □1.2, □1.6, □other _____

Application: □aboverground,□underground, pls specify stiffness (N/m2): □SN2500, □SN5000, □SN7500, □SN10000, □other _____

Design temperature(℃):

Connections: □spigot & socket with double O ring, □butt & strap joint, □flanged joint, □other _____

Quartz sand: □with, □without

Length of single pipe: □3m, □6m, □9m, □12m, □other _____

Standard: □GB/T21238, □AWWA C950, □ASTM D2996,□other _____