056stormwaterpe

uPONOr PE STOrMWATEr SySTEM 103

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The heavy-duty stormwater drainage solution

UPONOR INFRASTRUCTURE

uPONOr PE STOrMWATErSySTEM

104 uPONOr PE STOrMWATEr SySTEM

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The uponor PE Stormwater System meets

the majority of requirements related to

the storage and drainage of high storm-

water volumes.

The system consists of gravity sewer

pipes used primarily:

•for stormwater drainage

•as stormwater harvesting tanks

•for ventilation

•as culverts

•as stormwater attenuation tanks

The system and its inspection chambers

can be connected to all known sewer

system brands.

The PE stormwater system forms a

com pre hensive and flexible system,

comprising standard components with

a 800–1,600 mm diameter, as well as

fittings and special inspection chambers.

The pipe delivery length is 3 m and 6 m,

although these can be supplemented

with 1.5 m fitting pipes for optimal fitting

on site.

uponor PE Stormwater System pipes are

double-wall pipes with a smooth inner

surface. These pipes are designed for

maximum durability.

5.6 Uponor PE Stormwater System

The inside smoothness of the pipe guar-

antees optimal flow properties.

For a guaranteed long service life and

maximum strength, the system's com-

ponents are made of abrasion resistant

polyethylene. The material has high

impact resistance, even at –20 °C, and

is resistant to hydrogen sulphide and

similar corrosive substances.

The pipe sockets are equipped with a

fixed EPdM rubber seal. Once installed,

this guarantees high sealing pressure and

100% joint tightness.

The system comprises lightweight pipes

that are easy to transport and handle.

The pipes come in two stiffness classes:

– SN 4 and SN 8 – making them ideal for

a wide range of applications.

Jointing is quick and simple: the spigot

end slots directly into a socket containing

a fixed seal.

The uponor PE Stormwater System is

highly resistant to most solvents, acids,

oils and alkalis. A detailed description of

the system’s chemical resistance is given

in the chapter Materials and Service Life.


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Socket

Seal

Sample pipe profile

Figure 5.6.1

SN 4 pipes SN 8 pipes

Inside diameter Volume Outside diameter Weight Outside diameter Weight

mm m3/m mm kg/m mm kg/m

800 0,50 920 32,4 920 42,8

1000 0,79 1120 56,1 1140 106,8

1200 1,13 1320 97,2 1340 134,4

1400 1,54 1640 133,3 1640 193,3

1600 2,01 1840 225,0 1840 275,0

Pipe dimensions

Table 5.6.2

Properties PE100 Unit Standard/test method

density ≥ 940 kg/m3 ISO 1183

ring stiffness SN 2-4-8 kN/m2 ISO 9969

Long-term elastic modulus E50

180 MPa ISO 527-2

Short-term elastic modulus E0 800 MPa ISO 527-2

Thermal expansion factor 0,17 mm/m · °C

Thermal conductivity 0.4 W/m · °C dIN 52 612 / 23 °C

Impact resistance test temp. -20 °C EN 1411

Maximum continuous operating temperature 45 °C

Maximum momentary operating temperature 85 °C

Max. angle of joint deflection ≥ ø800 1 °

System and material specifications

Table 5.6.3


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Approvals & Markings

Approvals

The PE stormwater system is manufactured

according to uponor’s strict quality require-

ments. All pipes are produced in compliance

with uponor factory standard 750, which is

based on the EN 13476-1 standard.

Markings

The pipes carry the following markings

at the socket end:

1000 SN 8 02 2007 PE

Inside diameter Stiffness class Production date:

month/year

Material: polyethylene

1000

SN

8

02 2

007

PE

Table 5.6.4


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Handling

This section describes how the products

are to be loaded, transported, unloaded

and stored.

PE stormwater pipe must be stored on

wooden racks, to protect the pipe sockets

from loading. The maximum stacking

height for pipe bundles is shown in the

table below.

Storage in direct sunlight/heat must be

avoided wherever possible as, due to

their material properties, the pipes can

bend or lose their roundness.

To prevent damage to pipes and fittings,

unloading must be carried out care-

fully and in the proper manner. Never

use chains or cables for fastening down,

unloading or handling pipe loads. Never

unload by tipping.

The storage site must be properly pre-

pared before receiving pipe deliveries.

Stands or racks must be provided for

loose pipes, the storage site must be on

level ground, and suitable pallets must

be provided for storing pipe fittings and

similar products.

Diameter 1 bundle 2 bundles 3 bundlesmm

800 x

1000 x

1200 x

1400 x

1600 x

Pipe storage

Table 5.6.5


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PE Stormwater System Design

Structural design

For suitable installation conditions for

the pipe, refer to the table in the intro-

duction section of the drainage and

Sewer Systems chapter.

Flow design

When determining the pipe system’s

dimensions, it is important to ensure that

the system has sufficient flow and self-

cleaning capacity to ensure trouble-free

operation. The main design principles are

presented in the introduction section of

the drainage and Sewer Systems chapter.

Flow charts for the PE Stormwater System

are presented in appendices 8.1, 8.2 and

8.3. These charts use a roughness coef-

ficient value of 0.25 mm for the whole

system, including fittings and inspection

chambers. The roughness coefficient of

the pipe alone is 0.06 mm.

Protection against

hydrostatic uplift

The pipes can be anchored down, for

example, with a geotextile or geonet, to

protect them against hydrostatic uplift

due to rising groundwater levels. An

alternative option is to drain the site.

According to experience, hydrostatic up-

lift is not problematic if the backfill above

the pipe crown corresponds to the pipe

diameter, and the volume weight of the

backfill is 18 kN/m or higher.

The uplift of an empty PE pipe below

groundwater level and the ballasting

effect of the backfill can be calculated

using the chart given below. This calcula-

tion is performed per pipe metre. The

chart can also be used to calculate the

hydrostatic uplift of cylindrical tanks.


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The following chart shows the minimum

required depth of backfill above the pipe

crown, for the SN 4 uponor PE Storm-

water System pipe.

Minimum required depth of cover to prevent hydrostatic uplift in groundwater areas

Dep

th o

f co

ver

abov

e cr

own

(m)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500

soil type 1: bulk density = 16 kN/m3 soil type 2: bulk density = 18 kN/m3 soil type 3: bulk density = 20 kN/m3

Pipe size - inside diameter (mm)

As the chart shows, the bulk density of

the backfill is crucial with respect to how

deep the pipe must be laid to prevent

hydrostatic uplift.

The chart is based on the use of SN 4

stiffness class pipes, but can also be

applied to SN 8 pipes.

Geotextiles and geonets are used to

increase pipe ballast and prevent uplift.

After the pipe or tank is laid, the trench

is filled with a suitable initial backfill

material(haunching)uptothepipe's

centerline.

Minimum required depth of cover for SN 4 class Uponor PE

Stormwater System pipe to prevent hydrostatic uplift in groundwater areas

The geotextile or geonet is wound over

thepipe(inmostcasestransverselyacross

the pipe, although the direction depends

on the roll width and which direction

hasthehighesttensilestrength).When

laying the textile or net, it is important to

ensure that the anchorage length meets

minimum requirements on both sides of

the pipe. This requires a separate calcula-

tion. Initial backfilling and compacting is

then continued.

This chart is based on the pipe diameter

and backfill depth for three different

backfill soil types.

Diagram 5.6.6


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Geotextile

Geotextile

The geotextile or geonet should be

covered with non-cohesive soil as, due

to superior interaction between non-

cohesive soil and geotextiles/nets, the

anchorage length of the textile/net can

normally be shortened.

If the geotextile or geonet is used to sta-

bilise the pipe, the width of the textile/

net must be calculated separately.

Figure 5.6.7 Laying a geotextile or geonet

Geotextile or geonet installation for increased pipe ballast


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PE Stormwater System Installation

The following section describes the

handling and jointing of uponor PE

stormwater pipe.

3. Remove any sand etc. from the socket

and seal.

4. Clean the spigot end and lubricate

it with Uponor lubricant.

1. The ideal method for unloading PE

stormwater pipes is to use two lifting

slings on each pipe. This method protects

the socket and seal, and the spigot end,

from damage.

2. Check each pipe for transport damage

or flaws.


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5. The pipes are coupled by pushing the

spigot end fully home to the base of the

socket. If an excavator bucket is used to

push the pipe into place, always place a

block of wood between the bucket and

the pipe. The pipe must not be cut.

6. Initial backfill must be evenly com-

pacted on both sides of the pipe. Uneven

compaction can result in the transverse

displacement and deformation of the pipe.

7. After final backfill and compaction, the

pipe interior is inspected as necessary, for

any deformation and for angular deflec-

tion of the joints.

In the case of deeper trenches, a pipe

grapple can be used as an excavator

attachment for safer pipe placement.


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Jointing with other pipe types

The uponor PE Stormwater System,

including all inspection chambers, fittings

and adaptors, is fully compatible with all

known piping systems on the market.

1. Uponor PE Stormwater System

– concrete chambers or structures

The PE pipe can be connected to a

concrete chamber using a concrete-cast

PE socket.

Installation and casting of a concrete-cast

PE socket:

•An expansion sealing strip is installed

alongside the fixed collar of the PE

socket to be cast, on the water pressure

side of the collar.

•The castable PE socket is fastened to

a casting form, which is sealed around

the socket.

•A 35 MPa strength concrete suitable

for harsh environments is then cast

around the socket.

•The embedded socket is coupled to

the pipeline.

Concrete

Concrete-embedded socket

Water pressure

Expansion sealing strip

Concrete-cast PE socket installation

Figure 5.6.9

Pipeline direction changes are achieved

using socket bends. The maximum allow-

able angular deflection of the joints is 1 °.

Angular deflection, degrees 3 m pipe displacement 6 m pipe displacement

SDgr mm mm

1 52 105

Max. allowable angular deflection

Table 5.6.8

NOTE: The length of standard pipes and

fittings cannot be changed. Special-

length fitting pipes are used for fine-

tuning the pipeline length.


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– concrete pipes

uponor's PE stormwater chambers can

be connected to concrete pipelines using,

for example, Fernco adaptor couplings.

An alternative option is to cast a castable

uponor PE socket onto a concrete socket.


– PVC pipes

Smooth PVC pipes are coupled to PE

chamber inlets/outlets via a PVC double

socket. uponor also delivers bespoke

solutions and joints that require welding.

Connection to Uponor Stormwater Syste

m DW

Connection to sm

ooth PVC pipe

Connection to Ultra

Rib 2 system

Connection to sm

ooth ProFuse pipe

Connection to concrete pipe


– Ultra Rib 2 and Dupplex pipes

ultra rib 2 or dupplex pipes are con-

nected to PE chamber inlets/outlets with

spigot or socket adaptors. uponor also

delivers bespoke solutions and joints that

require welding.


– PE pipes

Smooth PVC pipes are coupled directly to

PE chamber inlets/outlets and the joint

is then electrofusion welded. These pipes

can also be coupled with a slip coupler.

Coupling with other pipe types can be

carried out, either using separate fittings

or by using inspection chambers equipped

with fixed inlet/outlet connections.

Coupling methods

Figure 5.6.10


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PE stormwater pipe connections

If, for example, a surface water drain

is to be connected to the stormwater

sewer, uponor can deliver pipes or fit-

tings with ready-welded connections.

An alternative option is to use special

PE inlets designed for 110 or 160 mm

diameter pipes. In such a case, a hole is

drilled into the pipe, a PE inlet is installed

in the hole, and a short PVC socket pipe

or bend is fitted to the inlet.

1. Drill the inlet hole with a hole drill.

2. Install the PE inlet in the hole.

3. Apply lubricant to the socket pipe. 4. Install the socket pipe.


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Ln1,500 mm

250 250 250 250 250 250

Bevel

Point of cut

Shortening a fitting pipe

1. Cut the fitting pipe flush with the rib

edge using e.g. a circular saw.

2. Bevel the end in accordance with

Table 5.6.12 with e.g. an electric plane.

3. To ensure a watertight joint, check the

spigot end for cracks or damage.

4. Couple the spigot end with the socket

in the normal manner.

Bevel

Pipe Bevel

Width (mm) Width (mm)

800 30

1000 40

1200 40

1400 40

1600 40

Pipe sizes and bevelling

Table 5.6.11

Figure 5.6.12

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