Download Water Sewer Design Guide PDF

TitleWater Sewer Design Guide
TagsPipe (Fluid Conveyance) Liquids Civil Engineering Hydraulic Engineering Sanitary Sewer
File Size3.9 MB
Total Pages60
Document Text Contents
Page 1

Pipe & Fittings
Water & Sewer

Design Guide

Page 2

Saint-Gobain Pipelines is the UK’s leading supplier of ductile iron pipe systems for

potable water and sewerage applications.

Saint-Gobain Pipelines is part of the Saint-Gobain Pipe Division, a global company with

a presence in Europe, Asia, South America and the Far East. The pipe division has over

9000 employees, and sells product in 120 different countries with approximately

100,000km of ductile iron pipes being installed worldwide per year.

The Saint-Gobain Pipe Division is part of the Saint-Gobain Group, one of the world’s

leading multi-nationals, which currently employs over 180,000 people in 48 countries

and over 1200 consolidated companies.

Everyone at Saint-Gobain Pipelines is dedicated to meeting customer expectations.

We encourage open communication between staff, customers and related

organisations to make a positive impact on the future of the marketplace and help

improve the quality of life for people worldwide.

UK customers benefit from the global network of the Pipe Division through our long

term commitment to improve and develop innovative products and processes. We

achieve this through continual investment in Research and Development on a global

scale. In excess of £10million per annum is spent on R&D programmes worldwide,

meaning an unrivalled product range of next-generation, ductile iron pipe systems

being constantly developed and delivered to the UK market.

For further information on Saint-Gobain Pipelines visit

www.saint-gobain-pipelines.co.uk

of ChoiceA World

Page 30

Soil classification
Table 7, shows the classification of soils together with the range of modulus (E1) which

can be obtained for various compactions (expressed as % Standard Proctor Density).

Table 8 shows the compaction method needed to obtain the required densities.

Practical considerations
Fig 3 shows a typical trench for a ductile iron pipe installation, with the pipe laid on a

trimmed flat bottom trench. The trench should be as narrow as is practical taking into

consideration the type of native soil and backfill and, where necessary, the required

compaction.

Special consideration should be given to the minimum depth of cover:

-to avoid any frost penetration (UK recommendation of 0.9m minimum), and

-to withstand any surcharge loading at the surface (e.g. traffic, railways etc.).

Joint holes should be provided to ensure that the pipe rests on the barrel.

In rocky ground, the trench should be excavated at least 100mm deeper than normally

required and then made up to the level with the addition of a suitable bedding

material.

Where necessary suitable precautions should be taken to avoid any risk of pipe

floatation prior to backfilling.

The embedment should be compacted as required (see Table 8). Where compaction of

the embedment is required, this should be carried out in layers and any trench

sheeting must be pulled progressively to enable the specified compaction to be

achieved.

Shallow Road Trenches
Where Saint-Gobain Pipelines’ water pipe installations of DN600 and above are

designed with a minimum depth of cover under highways, the majority of total load

acting on the pipe is vehicular loading. In this situation higher E1 values may be

required from the pipe surround to prevent deterioration of the road surface.

Narrow Trenching
In the range DN ≤ 300, because of its high inherent strength, Saint-Gobain Pipelines’

water pipes are ideal for narrow trenching installations. In the case of narrow trench

installations for larger sizes it may be necessary, in very poor ground, to use soil

stabilisation matting during compaction in order to obtain the required E1.

Exceptional Cases
Should conditions more severe than those covered by Table 7 occur e.g. exceptionally

weak native soil, or buried pipes laid on intermittent supports (piers) please contact

Pipelines Technical Sales Department, Tel: 0115 930 0700.

28

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Page 31

29

Table 7: Soil Classification and Embedment Class

Table 8: Soil Compaction Requirements

Description
Casagrande Group

Symbol

Degree of

Compaction % Sp

No. of Passes with

Standard Vibroplate

Thickness of

Layer

Gravel GW, GU

80 1 450

85 1 450

90 1 300

95 2 300

Gravel, Sand and coarse grained soil

with <12% fines
GP, SW, SP

80 1 450

85 1 300

90 2 300

95 3 300

Coarse grained soil with >12% fines GM, GC, SM

80 1 450

85 1 300

90 2 150

95 3 150

Fine grained soil LL <50% with medium

to no plasticity and containing >25%

coarse grained particles

CL, ML,

ML/CL

ML/MH

80 1 450

85 2 300

90 2 150

95 3 150

Fine grained soil LL <50% with medium

to no plasticity and containing <25%

coarse grained particles

CL, ML,

CL/CH

ML/MH

80 1 300

85 3 300

90 3 150

95 4 150

Soil Type/Embedment

Material

Casagrande

Group

Symbol

Embedment Class (E1) kN/m2

Uncompact

ed

Lightly

Consolidated

>80% SP

Light

Compaction

>85% SP

Medium

Compaction

>90% SP

High

Compaction

>95% SP

Gravel, single size GU 5000 7000 7000 10000 14000

Gravel, graded GW 3000 5000 7000 10000 20000

Sand & coarse grained soil with

<12% fines
GP, SW, SP 1000 3000 5000 7000 14000

Fine grain with >12% fines

Fine grain soil LL <50% with

medium to no plasticity and

containing >25%

coarse grained particles

GM, GC, SM

CL, ML

mixtures

ML/CL

ML/MH

0 1000 3000 5000 10000

Fine grained soil LL <50% with

medium to no

plasticity and

containing <25%

coarse grained particles

CL, ML

mixtures

ML/CL

CL/CH

ML/MH

0 0 1000 3000 7000

Sp = Standard Proctor Density

LL = Liquid Limit

Page 60

visit: www.saint-gobain-pipelines.co.uk
The information given in this literature is, to the best of our knowledge, correct at the time of going to print. However, Saint-Gobain Pipelines is
constantly looking at ways of improving their products and services and therefore reserve the right to change, without prior notice, any of the
data contained in this publication. Any orders placed will be subject to our Standard Conditions of Sale, available on request.

© 2006 Saint-Gobain Pipelines

Brochure Hotline
Tel: +44 (0)800 028 2134
Fax: +44 (0)115 932 9513
[email protected]

Technical Enquiries
Tel: +44 (0)1952 262529
Fax: +44 (0)1952 262592

Sales Enquiries
Tel: +44 (0)115 930 0630

Head Office
Lows Lane, Stanton-by-Dale, Ilkeston,
Derbyshire, DE7 4QU
Tel: +44 (0)115 930 5000
Fax: +44 (0)115 932 9513

Your local stockist is:

Other products and services available from Saint-Gobain Pipelines:

Ensign
Cast iron above and below ground drainage system BSI
Kitemark approved to BS EN 877.
Used for soil and waste, rainwater, suspended, buried and
bridge drainage applications, providing lifetime service for
commercial and public buildings.

Timesaver
Cast iron above ground system BSI Kitemark approved to
BS416 part 2, used for soil and waste refurbishment, and
external soil stacks for traditional appearance.
Cast iron below ground system BSI Kitemark approved to
BS437, favoured for under building drainage, and unstable
ground conditions due to its superior strength performance.

Classical – Classical Plus
Cast iron rainwater and gutter systems to BS460 BBA Certified.
Seven gutter profiles and circular and rectangular downpipes
systems supplied in a black primer coat. Classical Plus is
a standard range of gutters and downpipes available in
a factory applied semi-gloss black finished coat for
immediate installation.

EPAMS
A new syphonic rainwater system in cast iron BBA certified.

Integral and Integral Plus
A complete range of sewerage pipeline products available
from DN80 to DN1800, fully compliant with the
requirements of BS EN 598.

Natural
A new generation of potable water pipeline products available
DN80 to DN800 with a new revolutionary system of external
protection, fully compliant with the requirements of BS EN 545.

Large Diameter Water Pipes
Large diameter water pipeline products available DN900 to
DN1600, fully compliant with the requirements of BS EN 545.

Couplings and Flange Adaptors
Accommodating a wide range of external diameters and
pipe materials in accordance with British, European
Standards and ISO 9001 requirements. A diversified range
from wide tolerance fittings to dedicated products.

Valves
A comprehensive range of valves and accessories suitable
for water and sewerage applications. All valves are supplied
in compliance with WRAS requirements where applicable,
and manufactured in accordance with ISO 9001.

• Gate valves, resilient and metal faced DN50 to DN300
• Non return valves DN80 to DN300
• Tidal flap valves DN80 to DN600
• Air valves
• Fire hydrants

Rapid Flange
A business unit dedicated to offering fast and flexible service
to M&E and pump market sectors – specialising in providing
high quality flanged products and offering technical support
and rapid response – www.rapidflange.com

Induct Plus
An installation accreditation scheme, designed to give
peace of mind and confidence to water utilities and
contractors in the knowledge that the ductile iron pipeline
that they have purchased will be installed effectively and in
its optimum condition.

Access Covers and Gratings
A comprehensive range of ductile iron and fabricated steel
access covers and gratings. For high performance products
which meet the increasing demands from traffic to a
purpose designed range for low density applications,
Saint-Gobain Pipelines access cover products provide
targeted solutions for the key civil engineering, utility and
infrastructure sectors.

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