Flick sofia 26 11 2013 v1

Sofia 26.11.2013 BCC and BWA Conference

Challenges in the choice of materials for inlet collectors
Bau.-Ass. Dipl.-Ing. Karl-Heinz Flick
Association of German Vitrified Clay Pipe Industry, Frechen (D)

Dipl.-Ing. K.-H. Flick; Association of German Vitrified Clay Pipe Industry (FVST)


The four objectives of drains and sewer systems in accordance with EN 752:

o

Public health and safety

o

Occupational health and safety

o

Environmental protection

o

Sustainable development



Principles of wastewater engineering

o

Sewer systems provide a service to the society

o

The proper disposal of wastewater ensures public health and hygiene

o

With sewer systems overflow in residential areas is avoided and the
environment is protected

o

Main sewer systems cover for the functions:
collection / transport / treatment / discharge



Combined or
mixed sewer system

Source: BWB Berlin



Steps towards implementation

o

Fix objectives

o

Fix functional requirements

o

Fix strategic and policy activities related to planning, design,
construction, operation, maintenance and rehabilitation



EU legal implementations



water law



environmental law



technical standards



What inputs are required for planning and design?
What requirements have to demonstrated?
How to calculate the pipe’s resistance to stress?
What are the risks?
How to guarantee success?
And many other questions in addition!


7


Hydraulic design
i.e. transport of sediment and performance
Wastewater properties
i.e. chemical, biological, thermal and mechanical stresses
Mechanical and dynamic loads
i.e. during construction and operation
Construction
structural design for pipe / soil system
Operation
maintenance and rehabilitation
Safety
preserve for future stresses


8


Salient features of sewer system networks

Operator View

User / Client View

Operational reliability

High comfort

Underground installation

No problems

Once-only installation

Cost-efficient

Immutable implementation

Secure for the future

Low operational cost

Low maintenance and repair
costs

Long service lifetime

High security at low cost

High functionality

High reliability

9


EN 752 Drain and sewer systems outside buildings



To build and operate sewer system networks in a reliable and secure way –
Individual requirements and praxis



Pipe systems from the inside



To build and operate sewer system networks
in a reliable and secure way – Sustainable Development
Sewer system networks must be planned, build and operated
under optimal conditions for environment, society and economy.
Objectives
Use of renewable energy resources
Minimal energy consumption for operation
No impact on the environment
Source EN 752


To build and operate sewer system networks
in a reliable and secure way – Sustainable Development
„Drains, sewers and other components should be
designed, constructed, maintained and operated
to ensure structural integrity over the design life.”
Source EN 752
It is not sufficient to properly construct a sewer system,
it also has to be built in a way to ensure long operational life.
H.R. Steiner, Zürich (CH)



Good hydraulic performance

Environment-friendly

Abrasion resistant
Easy cleaning
possibilities

High mechanical strength

Chemical and
thermal
resistance

Completely tight

70°C
-10°C

pH
Particles

Parameters that will determine the longevity


Decision diagram

vitrified clay

Longevity
Corrosion
resistance

PVC

Impermeability

concrete
ductile iron

Mechanical
resistance

Abrasion
resistance

Thermal
stability

Hydraulic
smoothness
Impact resistance

PETZOW, G.; SCHUBERT, H.: Materialeigenschaften
im Spiegel des Kanalrohreinsatzes, Korrespondenz
Abwasser, (39) 1992, Heft 5, Seite 688-706


Evaluation-matrix of pipe materials and products based on technical properties
Criteria
Weightin
g points

Hydraulic
performance

Chemical
Resistance

Structural
design and
conditions

Construction
and
conditions

Tightness

Program

Environ
mental
aspects

Rehabilitation

Sum

5

20

15

5

20

15

10

10

100

Concrete
Vitrified
Clay (VC)
Ductil
Iron
PVC
PP
PE
GRP



Main properties of vitrified clay pipes according EN 295
crushing strength
32 – 140 kN/m
wall roughness
0,02 mm

bending tensile strength
12 – 25 N/mm2
compressive strength
100 N/mm2
elasticity module
50 000 N/mm2

hardness (Mohs)
~7
abrasion resistance
max 0,25 mm

resistance to
high pressure jetting
280 bar



Sustainability and sewer systems
COST-EFFICIENT

INTERGENERATIONAL EQUITY

Long service lifetime

No permanent financial burden

Low maintenance costs

through rehabilitation, repair, or

Economical safeguarding of

reconstruction

fixed assets

Sparing use of resources
Service life span > 100 years

ECO-FRIENDLY
Outstanding technical, chemical and physical properties:
- high strength, density and robustness
- high resistance to wear, tear and corrosion
100% recyclable



Vitrified clay pipes and the raw material

60-70% Clay

30-40% secondary raw materials



Vitrified clay pipes and the environmental life cycle

60-70% Ton

30-40% Sekundärrohstoffe



Competition in the underground
Quelle: IKT Gelsenkirchen, Prof. Dr.-Ing. B. Bosseler



Challenge Climate Change
•

Häufigere und größere
Starkregenereignisse



Conclusions for sewer systems
• Key function in the water cycle
• Essential part of municipal infrastructure
• Intergenerational engagement
• Long service life of over 100 years
• Challenge: Life Cycle Assessment vs. short term
invest budget

31

Flick sofia 26 11 2013 v1

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Flick sofia 26 11 2013 v1