ridgistorm-xl - the latest innovative solution to suds...

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Building regulations and legislative guidance now

require Architects, Consulting Engineers, Contractors

and Developers to seek out alternative ways to

manage and control surface water run-off from a

developed site. Ridgistorm-XL offers an effective

and adaptable solution to this issue, without

impacting on development footprint.

Combined with the technical expertise, knowledge and support of Polypipe WMS,

Ridgistorm-XL is designed as a bespoke application for each project and offers the

most advanced large diameter plastic pipe solution available in the UK.

Ridgistorm-XL - the latest innovative solution to SUDS and stormwater management

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Products and Solutions 2A

Page

Pipe Profiles and Key Benefits 2A 24 - 25

Unique Pipe Stiffness 2A 26 - 27

Bespoke Design, Fittings, Manholes and Applications 2A 28 - 29

Unique Electro-Fusion Jointing System 2A 30 - 31

Frequently Asked Questions 2A 32 - 33

Case Histories 2A 34 - 37

Products and Solutions Ridgistorm-XL Contents

Ridgistorm-XL an innovative pipe solution

Ridgistorm-XL is the latest innovative solution to SUDS and stormwater

management applications. With a range of large diameter pipes from 750mm up

to 2100mm plus the design and product technology features, it offers an effective

and adaptable solution, without impacting on the development footprint.

Bespoke pipe profile providing individual stiffness class

Ridgistorm-XL can be engineered to suit any application. By analysing the site

conditions and installation parameters, our design engineers can create a solution

with the appropriate profile strength and stiffness that is neither over nor under

engineered, thus saving material cost. Our production flexibility allows pipe

strength to be produced at varying stiffness classes to meet the design

requirements of a project, without the need to step-up pipe specification.

750mm 900mm 1050mm 1200mm 1500mm

Ridgistorm-XL - the most advanced large diameter plastic pipe solution

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The Ridgistorm-XL Technical Manual is available to

download at www.polypipewms.co.uk/downloads

25


25

Exceptional leak tightness

Ridgistorm-XL is designed as a flexible structure to minimise the

effects of ground movement and deformation and prevent leakage

from the pipeline or attenuation structure. Exceptional pipeline

integrity is achieved with Ridgistorm-XL due to the reduced number

of joints, therefore minimising the number of potential leakage

points and removing the risk of groundwater pollution.

Ridgistorm-XL versus rigid materials

Ridgistorm-XL offers a robust, durable and adaptable solution in

comparison to rigid materials such as concrete and steel. Due to its

longer lengths and lighter weight, Ridgistorm-XL can be 70% cheaper

to transport than equivalent size concrete pipes and can be handled

and stored much more safely on-site.

WRc Approval

Ridgistorm-XL and all pipe profile options, stiffness classes SN2 to SN8

and diameters from 750 to 2100mm are approved by WRc. The approval

also extends to all work carried out by Polypipe’s in-house Fabrications

Department, the design software used to engineer the product

(for SN1 - SN8) and Ridgistorm-XL’s unique and patented electro-fusion

jointing method, which covers the tensile strength of each joint, the

jointing method and Polypipe’s installation manual and guidance.

1800mm 2100mm

PT/193/1102

BBA BRITISHBOARD OFAGRÉMENT

CERTIFICATE No. 10/H159

Key benefits

• Ideal for use as large-scale

attenuation system

• Fabricated tanks to any size

• Light weight for ease of

handling and installation

combined with high stiffness

and durability

• 100% recyclable

• Strong yet flexible design

• Able to withstand ground

movement without leakage

• WRc Approved

• BBA Approved*

• Superior hydraulic

performance achieved

through smooth bore

• Up to 2100mm diameter

• Durable materials

• Excellent resistance to

sulphate and chemical attack

• Longer pipe lengths for

improved pipeline integrity

and fewer joints

• Unique patented

electro-fusion jointing system

• Excellent load bearing

capability

• Approved by most water

companies

*750mm and 900mm as a sealed system

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Individual pipe profiles

Following many years of development, structured wall pipe technology has

been designed and engineered to maximise the strength of the pipeline.

Utilising the latest manufacturing technology and unique, state of the art

software enables Polypipe WMS to create unique profile designs to match

customers’ site requirements. Pipe profile designs can be adapted to maximise

strength and minimise use of material within the pipeline, which improves

pipeline performance and provides a value engineered solution.

Our bespoke range of profiles are integral to the strength and performance

of the pipeline. Optimised wall thickness and pipe profile design ensures that

the pipeline can cope with both external and internal pressures and any

subsequent deformation.

Ridgistorm-XL is designed as a flexible structure to withstand point loading

and ground movement once installed.

PR profile

Pipes produced with a PR profile

achieve high stiffness with relatively

low weight. This is a common pipe

profile for use in sewer and surface

water drainage applications.

VW profile

Profile type VW enables the

production of a solid pipe with a

smooth inner and outer surface.

These pipes can be produced with

a wall thickness of 5mm to 80mm.

LIGHT LOADING

Ridgistorm-XL - unique pipe stiffness providing flexible and variable loading specifications

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This profile option has a smooth

inner and outer surface, including

internal profile to one layer. High

stiffness is achieved through the SQ

profile, making it ideal for extremely

high loads or larger diameters.

SQ profile

SQ2 offers the same benefits as the

single-layer SQ profile, yet it can be

produced with additional profile

layers for added ring stiffness.

SQ2 profile

In addition to the PR profile, the

Olympia profile option can achieve

greater pipeline stiffness with a

comparatively low weight.

Olympia profile

HEAVY LOADING

Polypipe WMS is unique in its ability to produce large diameter pipe and attenuation

solutions to match your exact requirements and site conditions. The flexibility of our

manufacturing process enables you to specify exact stiffness requirements and utilise

a value engineered solution that is neither under nor over specified.

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Bespoke project design

Ridgistorm-XL is designed as a bespoke solution to suit

each individual project. Our team of Design Engineers

and Drainage Specialists utilise the latest design and

manufacturing techniques to engineer a drainage

scheme to specific requirements. This flexibility enables

us to design-in required elements such as inspection

chambers at determined intervals and manhole access.

Ridgistorm-XL fittings

Utilising the skills of our in-house Fabrications Team we

can offer customers a complete range of bespoke

fittings, reducers, bends and attachments to the standard

Ridgistorm-XL pipe. Our bespoke fittings also enable the

Ridgistorm-XL system to be connected to a variety of

other applications, including concrete chambers and steel

carriage pipes. Reducers and bespoke bends also

facilitate the integration of Ridgistorm-XL into existing

drainage networks.

Large diameter manholes

Ridgistorm-XL pipe can be used in the construction

of bespoke large diameter manholes for use in both

surface water and foul sewer applications.

The Ridgistorm-XL range can also be manufactured

with integral manhole access to offer a complete

pipeline solution with maintenance access.

Bespoke and off-set manholes

The flexibility and adaptability of the Ridgistorm-XL

system, alongside the experience and capability of our

in-house Fabrications Team enables us to design and

manufacture bespoke manholes to meet site

requirements. Off-set manholes can be integrated into

a Ridgistorm-XL pipeline or attenuation system to

provide easier maintenance access to the system.

This utilises a unique step feature within the

construction of the manhole to reduce the need for

direct access into the pipe with improved Health and

Safety benefits, particularly in foul sewers.

Ridgistorm-XL

Bespoke fabrication

Pre-cast manhole

Ridgistorm-XL - applications

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Applications

With a range of diameters

from 750mm to 2100mm,

Ridgistorm-XL offers a

durable and engineered

solution to large-scale

attenuation and pipeline

requirements for use in:

• Surface water drainage

• Large-scale attenuation

structures

• Specialist pipeline

applications

• Foul sewers

• River diversions

and culverts

• Sea outfalls

• Rainwater HarvestingFilters in large diameter pipes Step irons or ladders

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Total flexibility

Polypipe WMS has designed the Ridgistorm-XL system to offer customers a range

of options. This flexible approach ensures that customers can take advantage of

systems designed and manufactured to their exact requirements and to project

specification. The range of jointing options available for Ridgistorm-XL offers

customers the greatest flexibility over other comparable systems.

Unique, patented electro-fusion jointing

Polypipe WMS offers the only large diameter plastic pipe solution with integral

electro-fusion jointing. Electro-fusion wire is connected to the socket end of

the pipe during manufacture and supplied with a unique barcode containing

the settings and installation parameters for the pipe.

Exceptional joint performance

Once the two connecting pipes have been brought together, internal and

external support rings are fitted to apply pressure to the seal during the

jointing process. The electro-fusion wire is then connected to an electrical

supply which joins the pipes together. Using the electro-fusion jointing

method, 100% seal tightness can be achieved to guarantee exceptional

joint and pipe performance.

Speedier jointing

In comparison with other large diameter systems, Ridgistorm-XL can be handled,

jointed and installed much quicker, resulting in time and cost savings on-site.

Insert support ring

Electro-fusion jointing

Barcode scan for jointing parameters

Ridgistorm-XL - advanced jointing system

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Multiple jointing options

Ridgistorm-XL can be designed and manufactured to suit any jointing

requirement on-site. EPDM, internal-welds and flange connections can all be

achieved with the Ridgistorm-XL system, depending on the installation and

application requirements of the project.

Less joints, less leakage

Ridgistorm-XL is available in standard lengths of 6 metres. With less joints,

Ridgistorm-XL significantly reduces the potential for leakage. Ridgistorm-XL

offers flexibility in specifying a joint that is appropriate for the project.

Health & Safety benefits

Electro-fusion jointing offers improved Health and Safety benefits over

traditional jointing methods reducing the need to work within confined spaces.

On-site, Ridgistorm-XL can also be jointed at the side of the trench before

being craned into position, reducing Health and Safety risks during installation.

Installation

Ridgistorm-XL units are installed in the same tried and tested way as twin-wall

flexible pipe systems. Ridgistorm-XL units are suitable for installations under car

park areas or roads. Separators are required only in high risk areas with

sustainable drainage systems. Consult Polypipe WMS Technical Team for

further advice.

Maintenance

Properly designed Ridgistorm-XL attenuation systems, incorporating suitable

catchpits, require no maintenance other than the removal of silt and leaves

from the catchpit, which may be done easily by on-site maintenance staff.

Placing next pipe in position

Release external compression chain

Ridgistorm-XL*

* Based on standard 6m length, other lengths available on request** Based on 2.5m length concrete pipe

Concrete**

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1. Can Ridgistorm-XL be recycled? Ridgistorm-XL is manufactured from polyethylene and is 100% recyclable

at the end of its useful life.

2. What quality standards does Ridgistorm-XL meet?

Ridgistorm-XL is approved by WRc (see page 25 for details) and is designed

to meet the performance requirements of the European sewer pipe

standard BS EN 13476. Ridgistorm-XL also meets the requirements of

DIN 16961. BBA approved for sizes 750mm and 900mm as a sealed system.

Approved by most water companies for capital works and section

104 schemes.

3. Do Ridgistorm-XL pipes deform under loading?

Ridgistorm-XL pipes are designed to deform. The deflection of flexible

pipes is controlled by the settlement of the soil. After settlement, traffic

and other loads do not affect pipe deflection. With rigid materials such as

concrete, traffic and other loads must be resisted by the pipe itself, making

the pipe prone to cracking. However with flexible pipes such as

Ridgistorm-XL the surrounding soil absorbs the stresses ensuring that the

pipeline remains intact.

4. What happens to the Ridgistorm-XL joints when deformation occurs?

The joints within the Ridgistorm-XL pipe system are tested for leakage

under deformation. This stringent test ensures that the joint remains water

tight even when pipes are deformed by 5% and the socket by 10%,

deformation far in excess of that encountered by the pipes in application.

5. Does Ridgistorm-XL have a proven track record? The technology used to produce Ridgistorm-XL pipes and fittings is tried

and trusted and has been in operation for 20 years. In fact, over 40

production lines are in operation worldwide including Germany, Italy

and Australia.

6. What is the Co-efficient of friction for the Ridgistorm-XL pipes? Ridgistorm-XL pipes benefit from a smooth inner wall, providing superior

hydraulic performance when compared with rigid materials such as clay

or concrete. See bar chart (left) for details.

Pipe deformation

inches

PE Clay Steel Ductile Concrete

3

2

1

0

Wall roughness

Ridgistorm-XL - frequently asked questions

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7. Are Ridgistorm-XL pipes abrasion resistant?

Pipes manufactured from polyethylene (PE) or polypropylene (PP) offer far

greater abrasion resistance than alternative materials. The graph (right)

shows the abrasion curve of various pipe materials according to the results

of the Darmstadt procedure. This graph demonstrates the superior

performance of PE and PP pipes.

8. Are Ridgistorm-XL pipes UV resistant?

Yes, Ridgistorm-XL pipes are resistant to UV attack and can be safely stored

on-site without any damage or ageing effects. Ridgistorm-XL pipes may also

be suitable for some above ground applications.

9. What is the standard bedding detail for Ridgistorm-XL pipes?

Type S bedding detail is standard for the installation of the Ridgistorm-XL

system. However, by using the unique Easypipe software, we are able to

engineer alternative trench bed and surround details to ensure optimum

construction methods to suit each individual project.

10. Are Ridgistorm-XL pipes easy to handle and store on-site?

Yes, Ridgistorm-XL pipes can be handled by forklift without the need

for any additional equipment on-site. Ridgistorm-XL pipes can be

unloaded and transported to the trench by excavator which will already

be present on-site.

11. How should Ridgistorm-XL pipes be stored?

When storing Ridgistorm-XL pipes and fittings it is necessary to ensure that

they are stored on flat ground, free of stones or other sharp objects to

avoid any point loading on the pipes. It is also important to rotate each

pipe layer by 180 degrees so that the sockets of the upper layer are not

lying directly over the sockets of the lower layer. See diagram below.

Do not stack Ridgistorm-XL pipes more than four metres high. It is also

important to use wood bearing supports between the pipes to ensure even

load distribution and wooden chocks to prevent pipes from rolling. Please

carry out an appropriate Health and Safety risk assessment for your site.

2.0

abrasionin mm

concrete pipeconcrete pipecoated GFK pipe

Clay pipe

PVC pipe

PP or PE pipe

cycles

1.5

1.0

0.5

0 50 100 150 200 250 300 350 400 450

0.25

Abrasion resistance

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Working alongside the main contractor, Dawnus Construction and project

engineers Peter Brett Associates, Polypipe WMS has supplied and installed

72 metres of 1200mm diameter Ridgistorm-XL pipe along two separate runs.

Ridgistorm-XL’s patented electro-fusion jointing process achieved quicker and

safer installation in comparison with other large diameter pipe solutions and

guarantees 100% seal tightness for each joint. Ridgistorm-XL was specified for a

section of this diversion due to its inherent strength and cost effectiveness when

compared to traditional rigid materials. The system was installed in an enclosed

concrete structure and then covered with wet-cast concrete. This then enabled the

construction of a temporary road for heavy plant and vehicles to travel across the

watercourse, whilst allowing the re-routed water to flow through the pipeline.

Polypipe WMS completed a challenging river diversion project at the Ffos-y-Fran

Land Reclamation Scheme in Merthyr Tydfil, Wales using its Ridgistorm-XL

large diameter pipe system.

Ridgistorm-XL case historiesRiver diversion project using Ridgistorm-XL

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Having proved that Ridgistorm-XL large diameter pipe system could achieve

significant savings on the whole-cost of the project, Polypipe WMS worked closely

with the contractor to design a 400 metre balanced attenuation tank with a storage

capacity of one million litres, using Ridgistorm-XL large diameter pipe in 1.8 metre

diameter to manage surface water run-off from all hard standing areas. In addition

to the attenuation tank, Polypipe WMS also designed and fabricated a bespoke

300,000 litre rainwater harvesting solution using Ridgistorm-XL pipe in

2.1 metre diameter, to re-use rainwater from the 6,000 square metre roof area

on-site. Alongside its full design and technical support service, Polypipe WMS

supplied a wide variety of bespoke fabrications for the non-standard elements of

the project, including bespoke 150mm stubs at intervals along the attenuation

structure to connect gullies from each cattle grid. The rainwater harvesting tank

also included a fabricated ‘T’ section that features an in-line leaf filter to prevent

debris from entering the tank.

A detailed cost analysis carried out by the main

contractor, on the cost-effectiveness of plastic

and concrete materials resulted in Polypipe WMS

re-engineering a bespoke SUDS solution for a new

livestock market.

Bespoke - Large diameter attenuation and rainwater harvesting solution for new livestock market

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Ridgistorm-XL - Electro-fusion joint delivers stormwater diversion for Gatwick Airport

Ridgistorm-XL was specified by the main contractor for its electro-fusion jointing

system. The existing storm drain needed to be relocated and the Ridgistorm-XL

pipeline installed prior to the piling work being carried out for the new building.

Concerns over the pipeline integrity as a result of the piling work were negated by

using Ridgistorm-XL. The patented electro-fusion jointing method guarantees

100% seal tightness within the pipeline and is the only large diameter plastic pipe

system in the UK to incorporate such technology.

Polypipe WMS supplied a bespoke large diameter pipeline solution

using Ridgistorm-XL for the construction of a new airside building at

Gatwick Airport’s North Terminal.

Ridgistorm-XL Large Diameter Pipe System Provides the Solution for Landfill Project

Using its patented and WRc approved pipe design software and a soil report provided by the main contractor, Polypipe

WMS determined a bespoke stiffness class for the Ridgistorm-XL discharge and collection pipe that was value-engineered

to meet the project specifications. Polypipe WMS engineered the solution based on the soil conditions, burial depth

and installation parameters and are the only manufacturer of large diameter plastic drainage pipe with this capability.

This enabled Polypipe WMS to optimise the amount of material used to manufacture the Ridgistorm-XL pipeline, which

in turn provided a more effective solution for the project. Polypipe WMS supplied over 600 metres of its Ridgistorm-XL

system in 1050mm diameter. This was installed around the perimeter of the site to manage surface water run-off from

the capped areas of the landfill. Sections of the Ridgistorm-XL pipe were also perforated to collect excess stormwater for

carriage through the discharge pipe. In addition to its Ridgistorm-XL large diameter pipe, Polypipe WMS also supplied

over 700 metres of 300, 450 and 600mm diameter Ridgisewer and Polysewer sewerage pipe.

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Polypipe WMS re-engineers original specification for Northumbrian Water flood alleviation scheme based on Ridgistorm-XL’s proven performance and electro-fusion jointing.

Early involvement in a capital projects scheme in

Penshaw, County Durham for Northumbrian Water

enabled Polypipe WMS to work closely with consultant

engineers Mott MacDonald and supply its Ridgistorm-XL

large diameter pipe system. An alternative system was

originally specified but this was re-engineered after

Polypipe WMS demonstrated the performance capabilities

and electro-fusion jointing technology of the

Ridgistorm-XL system. 114 metres of Ridgistorm-XL pipe

in 1050mm diameter were supplied to the scheme, along

with 1050mm elbow joints and two large diameter

1800mm manholes fabricated at Polypipe WMS’s dedicated

facility in Loughborough - the largest fabrications

department for plastic drainage products in the UK.

Ridgistorm-XL’s electro-fusion jointing method was a

significant factor for Northumbrian Water, Mott

MacDonald and contractors Seymour Civil Engineering as

this eliminated the need for internal welding within the

pipework. Once on-site, the improved handling and

quicker installation of the Ridgistorm-XL system compared

to traditional rigid materials enabled Seymour to reduce

the overall construction programme by two weeks. In

addition to the design and technical support provided by

Polypipe WMS during the initial stages of the project,

Seymour’s on-site team were also trained on the

electro-fusion welding of the Ridgistorm-XL system to aid

in the rapid installation of the products. This offered

further Health and Safety benefits as the need for working

in confined spaces was reduced. This project marks the first

capital works scheme to use the Ridgistorm-XL large

diameter pipe system, with all parties working closely

together to trial the new technology. As a modern

alternative to traditional rigid materials that provides

unique factors such as electro-fusion jointing and bespoke,

site-specific design, Ridgistorm-XL can deliver tangible

benefits in terms of reduced health and safety risks,

improved pipeline performance through joint integrity

and an overall reduction in the construction programme.

Bespoke - Ridgistorm-XL Large Diameter Pipe system

ridgistorm-xl - the latest innovative solution to suds...

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