Geberit HDPE User manual

Geberit Sales Ltd
Geberit House
Academy Drive
Warwick
Warwickshire
CV34 6QZ
T 0800 077 8365
F 0844 800 6604
Eire: [phone]
Literature: 0800 007 5133
→ www.geberit.co.uk
Subject to change without notice. The information in this document contains general descriptions of the
technical options available, which do not always have to be present in the individual cases. The required
features should therefore be specified in each individual case at the time of closing the contract.
© Geberit, February 2013.
DRAINAGE
SYSTEMS
INSTALLATION
GUIDE
VALID FROM1. NOVEMBER 2018

1
Geberit Drainage Systems
Introduction
BBA British Board of Agrément
Geberit HDPE pipes and fittings have been certified by
many European authorities and in 1976 also received
BBA certification.
European Quality Certificate IS0 9001.2000. For its
manufacturing plants in Europe Geberit has received the
highest quality system available, issued by theSwiss
EQ-Netmember SQS for compliance with the ISO 9000/
EN 29000 series. EQ-Net members are in all countries
throughout Europe, includingBSI QA United Kingdom.
DIN Standards Geberit conforms to:
•EN1519: Plastics piping systems for solid waste and
discharge (low and high temperature) within the building
structure. Polyethylene (PE)
•DIN 19535-10: High density polyethylene (PE-HD)
pipes and fittings for hot-water resistant waste and
soil discharge systems (HT) inside buildings-Part
10: Fire behaviour, quality control and installation
recommendations.
•DIN EN 12666-1: Plastic piping systems for
non-pressureunderground drainage and sewerage
systems. Polyethylene (PE).
Introduction
Geberit HDPE is the total solution for all types of drainage
including above ground, below ground and chemical waste.
It provides the appropriate solution for every requirement
whether it is conventionally installed or prefabricated.
Geberit Silent-db20 gives all the benefits of HDPE with
increased levels of sound proofing which is achieved by its
patented high density material. The ribbed fittings and
acoustic brackets further improve sound dampening near
impact zones.
This guide has been designed to assist you and provide
technical support for all your Geberit HDPE and Geberit
Silent-db20 installation needs. Geberit Silent-db20 has
specific requirements that should be considered when
planning and installing.
We hoped to haveincluded all your needs but should you
need further assistance please contact our Technical
Services department on 0800 077 8365.
Standards and Approvals

2
1 Geberit HDPE and Geberit Silent-db20 systems – general information 4
1.1 Geberit HDPE overview 4
1.2 Geberit Silent-db20 overview 5
1.3 Features and benefits of Geberit drainage systems 6
1.4 Pipe specification Geberit HDPE 10
1.5 Pipe specification Geberit Silent-db20 11
2 Characteristics and chemical resistance 12
2.1 Chemical resistance – The significance of pH values 12
3 Geberit Silent-db20 systems – acoustics 13
3 Best practice for acoustics 13
3.1 Additional acoustic products 14
4 Jointing methods 16
4.1 Butt welding17
4.1.1 Butt welding by hand 18
4.1.2 Butt welding by machine 19
4.2 Electrofusion coupling 20
4.2.1 Electrofusion coupling (for pipes ø 40 to 160mm) 21
4.2.2 Electrofusion coupling (for pipes ø 200 to 315mm) 22
4.2.3 Conversion to a slip coupling 23
4.3 Ring-seal sockets 24
4.4 Expansion fittings for Geberit HDPE 24
4.5 Flanged joint 25
4.6 Screw-threaded joints 26
4.6.1 Screw-threaded joint with flange bushing 26
4.7 Jointing for Geberit Silent-db20 27
4.8 Expansion fittings for Geberit Silent-db20 27
4.9 Jointing Geberit drainage systems to other materials using adapters 29
Drainage Systems Installation Guide
Contents

3
5 System installation 34
5.1 Spacing for bracketry 34
5.1.1 Guide brackets 34
5.1.2 Bracketry for Geberit Silent-db20 35
5.2 Managing thermal movement – above ground systems 36
5.2.1 Controlled expansion 36
5.2.2 Deflection leg – guidance on use 40
5.2.3 Rigid fixing 41
5.2.4 Suspended rail system 43
5.3 Waterproofing 44
5.4 Fire protection 45
6 Alternate stack ventilation system 46
6.1 Geberit Sovent overview 46
6.1.1 Geberit Sovent – planning 46
6.1.2 Geberit Sovent – stack sizing 52
6.1.3 Geberit Sovent – installation 52
6.2 Geberit air admittance valve overview 53
6.2.1 Geberit air admittance valve – GRB90 53
6.2.2 Geberit air admittance valve – GRB50 55
7 Buried drain systems 56
7.1 Buried drain systems – overview 56
7.2 Trench details 57
7.3 Managing thermal movement – buried drain applications 58
7.4 Rigid installation – embedded in concrete 59
7.5 Pipes penetrating through building walls 60
7.6 Connection to manhole 61
Appendix: Chemical Resistance 62
Drainage Systems Installation Guide
Contents

4
1.1 Geberit HDPE overview
1 Geberit HDPE and Geberit Silent-db20 systems – general information
Geberit HDPE represents state of the art in drainage
systems and is a real alternative to more traditional
material installations. It combines flexibility, durability
and reliability complemented by environmental
properties that put other pipe systems to shame.
Geberit HDPE is the total solution for all types of
drainage including above ground, below ground (within
building footprint) and chemical waste. The system is
manufactured from High Density Polyethylene, a material
with inherent properties that provide many advantages
over other traditional piping systems. This has made HDPE
the material of choice across Europe.
Geberit HDPE provides specifiers and installers with
complete flexibility above and below ground.
The properties of HDPE mean that pipes and fittings
are resistant to fracturing, abrasion, impact and
extremes of temperature. Combined with the flexibility of
several jointing methods and the option of off-site pre-
fabrication, Geberit HDPE offers substantial material and
labour savings.
Introduction
Geberit Drainage Systems

5
Geberit Drainage Systems
Introduction
Geberit Silent-db20 is a drainage system for buildings
with increased levels of sound proofing. Its outstanding
acousticinsulationpropertiesareachievedby:
•Patented high density material specifically developed
for this purpose (PE-S2).
•Fittings with ribs for further improvement of sound
dampening near impact zones.
•Non compressible rubber lined acoustic brackets
to reduce the transfer of structure-borne noise by
decoupling the stack from the structure.
The complete range consists of pipes and fittings in
dimensions from 56mm to 160mm. This guarantees
complete acoustic insulation from the appliance connection
through to the drainage system.
Advantages of the Geberit Silent-db20 system:
• Improvedacousticproperties.
• GeberitSilent-db20pipesandfittingsarecompatible
with the existing Geberit HDPE Drainage System.
• Timesavinginstallationtechniquesduetomany
different connection possibilities.
• Simplifiedfasteningtechniqueforuseincommercial
drainage systems.
• Bracketingsystemoptimisedfortheinsulationof
structure-borne sound.
1.2 Geberit Silent-db20 overview

6
1.3 Features and benefits of Geberit drainage systems
Geberit High Density Polyethylene (HDPE): Density 951 – 955 kg/m3
The density of polyethylene varies between 910 – 960 kg/m3. Geberit HDPE, up to 955 kg/m3,
is of the highest quality and has excellent durability. HDPE is light weight, which is beneficial
particularlywithregardstohandling,transportationandinstallation.GeberitSilent-db20:Density
1700kg/m3 Increased density improves acoustic properties.
Tempered 10mm per metre (licence Geberit International AG)
The safest way of avoiding the inevitable reversion (shortening of the dimensions) after heat load in the
plastic pipe, is to take preventative measures during manufacture. Geberit HDPE pipes and Geberit
Silent-db20 are therefore stored in hot water baths after manufacture. This process increases the
safety of the joints, as there is no chance of joints pulling apart later due to shortening of length.
Resistance to cold
When Geberit HDPE and Geberit Silent-db20 parts are filled with water and then freeze, they stretch
elastically as the ice expands. Once the ice melts they resume their original shape, remaining completely
intact and undamaged.
Flexibility
The flexibility of Geberit HDPE makes it ideal for certain buildings or on bridges, especially when
pipes have to pass through expansion joints or are in buildings that are subject to traffic vibrations.
Melt-flow index 0.4 – 0.5g/10min
This describes the working properties of the pipe and at the same time gives information on the
molecular weight, which is crucial for a number of raw material properties. The smaller the melt-flow
index, the higher the molecular weight and thus the pipe’s resistance to stress corrosion.
Thermal conductivity 0.43 W/m.K
Geberit HDPE and Geberit Silent-db20 are poor conductors of heat. For this reason the pipe does
not become completely warmed through when heat loaded for a short period. Heat loss is about 90%
less, for instance, than a similar copper pipe.
Introduction
Geberit Drainage Systems

7
Resistance to radioactive effluents
There is no risk of damage as a result of slightly radioactive water. However, please ask
our Technical department for more information relevant to the particular application.
Resistance to abrasion
Drainage systems are increasingly becoming hidden refuse chutes. A pipe’s resistance to abrasion is
a particularly important factor in branch pipes, soil stacks and ground pipes. Geberit HDPE is highly
resistant to abrasion and its extra thick walls offer additional protection.
Thermal expansion 0.17mm/m.K
Heat expansion of Geberit HDPE is relatively high. As a rule of thumb, for every 50°C increase
in temperature, an expansion of 10mm per linear metre of pipe can be anticipated.
Resistance to hot water
Geberit HDPE can be safely used as a waste pipe with continuous flow temperatures
of up to 80°C and for intermittent discharges of up to 100°C for short periods (maximum
1 minute flow for a maximum of 400 times per year).
Resistance to impact
Geberit HDPE and Geberit Silent-db20 are unbreakable at room temperature. Their resistance to
impact is very high even at extremely low temperatures (down to approximately -40°C) thus meeting
the requirements for externally installed pipes.
Condensation
Geberit HDPE and Geberit Silent-db20 are poor conductors of heat. No condensation
should form during short periods of undercooling. For areas with longer periods of
cooling in high humidity conditions, insulation may be required so please seek advice.
In particular internal rainwater pipes passing through a warm building would benefit
from thermal insulation
Introduction
Geberit Drainage Systems

8
Not electrically conductive
Plastics have an excellent reputation as insulators in the electrical industry, e.g. HDPE cable protection
ducts, cast resins, insulating paint etc.
Sealing material
Although the chemical resistance of the seal does not equal that of Geberit HDPE, there is no risk
of the seal being destroyed because the rubber ring is installed under compression on all sides and
therefore cannot swell. In addition, the wetting factor of the rubber ring in the joint is very low. Many
years of experience has shown that the sealing material can endure even the harshest conditions.
NB: Such conditions do not occur in drainage pipes.
Solar radiation
Geberit HDPE pipes are protected against ageing and embrittlement caused by UV rays by the
addition of approximately 2% carbon.
Introduction
Geberit Drainage Systems
Behaviour in fire
Geberit HDPE and Geberit Silent-db20 are flammable materials in open combustion. They have
however been installed throughout Europe for over 40 years and, when installed in accordance with
local regulations, present no greater risk of fire propagation than similar plastic based systems. Use
with Geberit fire collars is recommended and these should be installed in strict accordance with the
instructions provided.
Joint integrity
Many years of experience with welding Geberit HDPE pipes have shown that butt welds do not give any
problems as the welding parts are circular on the inside and do not add to the normal risk of blocking.
Chemical resistance
Because of its paraffinic structure, Geberit HPDE and Geberit Silent-db20 are highly resistant
tochemicals.Theirresistancecanbesummarisedbrieflyasfollows:GeberitHDPEand Geberit
Silent-db20 are insoluble in all inorganic and organic solutions at 20°C. Geberit HDPE and Geberit
Silent-db20 are only soluble in aliphatic and aromatic carbons and their chlorinating products at
over 90°C. The material will be attacked by heavily oxidised media (conc. HN03, conc. H2SO4)
when exposed over long periods at room temperature. See chemical resistance charts on pages
64–72 for more information.

9
Protection against blockages
Geberit HDPE’s water-repelling properties are highly beneficial in this regard.
• Rapidoutflowofwater
• Preventionofdeposits
Welding temperature
Thermoplasts are processed with a high level of energy efficiency. The temperatures required are
relatively low in comparison with metals. The welding temperature for Geberit HDPE and Geberit
Silent-db20 is approximately 230°C. Simple tools allow for easy processing.
Non-toxic
Plastics are well suited for use in the food industry as packaging materials, containers, bottles etc.
Geberit HDPE pipes are used for milk transportation lines in mountain areas and in the food canning
and packaging industry.
Working pressures
Geberit HDPE and Geberit Silent-db20 pipes are designed for drainage systems. Their use in low
pressure areas (swimming pools, transportation lines etc) is subject to a maximum internal pressure
load of 15m Water Column (1.5bar) and a temperature of 30°C (10 years).
Painting
Geberit HDPE is not suitable for painting. Its water repellent properties and the flexibility of the material
both have a negative impact on paint. If painting is unavoidable, the paint product to be used should
be tested for compatibility with Geberit HDPE.
Geberit Drainage Systems
Introduction
Noise
Improved acoustic properties. Structure-borne sound must be cushioned by taking appropriate
measures (acoustically insulated pipe brackets, insulating material).

10
1.4 Pipe specification Geberit HDPE
Standard length of Geberit HDPE pipes is 5 metres (5000mm).
ISO = International Standard Organisation.
HDPE pipes
Nominal Wall Inside Area Weight Weight Series
O/D thickness dia. empty full (ISO)
d (mm) s (mm) di (mm) A (cm2) kg/m kg/m S PN Number Article No.
40 3 34 9 0.331 1.239 6.3 8.1 360.000.16.0
50 3 44 15.2 0.420 1.940 8 6.4 361.000.16.0
56 3 50 19.6 0.471 2.434 - 5.7 363.000.16.0
63 3 57 25.4 0.536 3.087 10 5 364.000.16.0
75 3 69 37.3 0.644 4.383 12.5 4.1 365.000.16.0
90 3.5 83 54.1 0.903 6.313 12.5 4 366.000.16.0
110 4.3 101.4 80.7 1.350 9.424 12.5 4 367.000.16.0
125 4.9 115.2 104.5 1.750 12.171 12.5 4 368.000.16.0
160 6.2 147.6 171.1 2.840 19.947 12.5 4 369.000.16.0
200 7.7 184.6 268.4 4.442 31.158 12.5 4 370.050.16.0
250 9.7 230.6 418.2 6.993 48.683 12.5 4 371.050.16.0
315 12.2 290.6 663.8 11.083 77.289 12.5 4 372.050.16.0
Nominal Wall Inside Area Weight Weight Series
O/D thickness dia. empty full (ISO)
d (mm) s (mm) di (mm) A (cm2) kg/m kg/m S PN Number Article No.
200 6.2 187.6 276.4 3.580 31.216 16 3.2 370.000.16.0
250 7.8 234.4 431.5 5.630 48.774 16 3.2 371.000.16.0
315 9.8 295.4 685.3 8.920 77.442 16 3.2 372.000.16.0
Thinner wall HDPE pipes Only use for above ground drainage and low (less than 450m bar negative pressure)
siphonic rainwater applications
Introduction
Geberit Drainage Systems
5 (m)
d
s
di
A
cm2
d

11
Standard length of Geberit Silent-db20 pipes is 3 metres (3000mm).
Geberit Drainage Systems
Introduction
1.5 Pipe specification Geberit Silent-db20
O/D Wall Thickness Inside Dia. Area Water Volume Weight Full Article No.
d (mm) s (mm) di (mm) A (cm2) (l/m) (Kg/m)
56 3.2 49.6 19.3 1.93 2.83 305.000.14.1
63 3.2 56.6 25.1 2.51 3.53 306.000.14.1
75 3.6 67.8 36.1 3.60 4.97 307.000.14.1
90 5.5 79 49 4.90 7.38 308.000.14.1
110 6 98 75.4 7.54 10.87 310.000.14.1
135 6 123 118.7 11.87 16.00 312.000.14.1
160 7 146 167.4 16.74 22.50 315.001.14.1
3 (m)
d
s
di
A
cm2
d

12
Geberit Drainage Systems
Characteristics and chemical resistance
2.1Chemical resistance – The significance of pH values
One of the most crucial factors in selecting a material
for a drainage installation is the chemical loading of the
effluent being discharged.
Effluent with a low or high pH is harmful because of its
corrosive effects, e.g. some drain cleaning fluids have a
pH value of up to 12.
Therefore in order to select the most suitable material
to handle a specific discharge it is important not only
to know the pH value of the effluent but the chemical
resistance of the pipe materials.
For full details see chemical resistance tables in the
appendix to this guide to assess the performance of
Geberit HDPE at various temperatures.
The pH value is therefore important in assessing the
chemical level as it will indicate whether the effluent is
acid, neutral or alkaline. The pH scale ranges from 0 to 14
(see table below).
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
increasingly acid
NEUTRAL
very acid very alkaline
slightly
acid
slightly
alkaline
increasingly alkaline
HDPE
… can be used safely with pH values from 0 to 14.
… is suitable, for example, for use with effluents
containing over 30% hydrochloric acid.
pH values of some drinks and cleaning agents
pH-value
Cola drinks 2.8
Apple juice 3.5
Tartaric acid 2.2
Citric acid 2.8
Washing solutions 9 -13
Toilet cleaner 2 - 4

13
Geberit Drainage Systems
Geberit Silent db20 systems – acoustics
Basic principles of minimising sound transmission
from noise source.
• Airbornesoundrapidlyattenuateswithdistanceand
transfers through multiple layers (barriers).
•Structure-borne sound travels faster and further (Fig 1).
• Thebestwaytominimisenoiseisthroughthe
construction of the building.
- Plan bathrooms so they are not next to living rooms.
- Decouple walls from one another (Fig 2)
- Use pre-wall installation and wall-hung WC’s
to decouple the flushing noise from the building
structure (Fig 3).
To minimise noise transfer from drainage pipes:
Isolate pipe from structure using acoustic brackets and
foam barrier when passing through structure. Contain pipes
inductworkpreferablywithanacousticmaterialeither:
•Wrapped around the pipe (Geberit Isol).
•On two surfaces of the duct inner face.
Additional considerations:
•When pipes pass through concrete floor slabs and walls
the pipe must be isolated with Geberit Insulation Hose.
•All vertical offsets must be made using 2 x 45° bends
to minimise noise emissions. No offsets are preferred to
minimise noise.
15° minimum angled bends preferred to minimise noise
generation. However, for practical reasons 45° should
be the maximum.
For increased structure-borne noise reduction, install
Geberit Duofix installation systems and associated
components together with the Geberit Silent-db20
acoustic drainage system.
*standard Geberit HDPE
Fig 1
Fig 2
Fig 3
Pre-wall
construction
Acoustic pan
isolator
3Geberit Silent-db20 systems – acoustics
3.1 Best practice for acoustics

14
Geberit Drainage Systems
Geberit Silent db20 systems – acoustics
13452
L
B
s
13452
L
B
s
13452
L
B
s
Geberit Isol Acoustic Wrap
3.1 Additional acoustic products
Pos. Description Material Thickness Details
(mm)
1 The covering foil PE 0.07 Black with printed
prevents moisture product logo
penetration at the
same time as serving
as a vapour barrier
2 Heavy foil EVA with mineral 1.4 Anthracite grey basis
filler (BaSO4) and weight 3kg/m2
flame retardant
3 Semi open-cell PU foam, 15 Anthracite grey volumetric
acoustic foam open cell weight 30kg/m3
4 Self-adhesive layer Polyolefin Colourless used as
(only applicable to self-adhesive foil installation aid
self-adhesive version)
5 Protective paper PE 0.07 Yellow-brown can be
(only applicable to pulled off silicon-coated
self-adhesive version) on one side
The covering foil prevents moisture penetration at the same
time as serving as a vapour barrier. The heavy foil insulates
the airborne sound while the semi open-cell acoustic foam
layer prevents the propagation of solid borne noise.
L (cm) B (cm) S (mm)
118 78 17

15
Geberit Drainage Systems
Geberit Silent db20 systems – acoustics
Installation instructions
The pipe must be free from dust and grease
before processing.
For optimum performance the Geberit Isol must cover all
the pipework and be overlapped at joins and fixed with
tape to prevent the escape of sound.
Installation dimensions
5Use commercial adhesive tape (approximately 7cm
wide) to mask off adjacent point against condensation.
1
2
3
4
Fastening distance with binding wire is 10-15cm.
Ø / DN AB(cm) m2
40 / 40 26 0.260
50 / 50 29 0.290
56 / 56 31 0.310
63 / 60 33 0.330
75 / 70 37 0.370
90 / 90 43 0.430
110 / 100 49 0.490
125 / 125 54 0.540
135 / 125 57 0.570
160 / 150 65 0.650
200 / 200 78 0.780
250 / 250 91 0.910
315 / 300 111 1.110

16
Jointing methods
Geberit Drainage Systems
Within an ever more competitive culture, installers
and specifiers are continually striving to reduce costs,
labour and materials used in the construction process.
Flexibility of any construction system is paramount in the
reduction of many cost factors, allowing a more open
view to design and installation.
Geberit HDPE drainage provides installers and specifiers
with a wholly more flexible, multi-application drainage
solution. The system incorporates several jointing methods
that present many advantages over other piping systems.
It allows the installer to choose a preferred or appropriate
jointing method as well as aiding pre-fabrication of the
drainage system off-site. Jointing methods are fast and
easy - installers can become proficient in installation after
training provided on-site or at Geberit’s Training Academy.
4Jointing methods
Butt weld Electrofusion
coupling
Ring-seal
socket
Screw-
threaded
joint
Linear
expansion
socket
Flange joint Contraction
sleeve
The many Geberit jointing methods offer solutions for
all situations and each type of connection has different
properties that are classified according to the way in which
theyareassembled:
a To be opened
Jointing methods which can be disconnected
after assembly.
bNot to be opened
Jointing methods which can not be disconnected
after assembly.
cTension-resistant
Connections that can withstand tensional forces.
dNon-tension-resistant
Connections that can not withstand tensional forces.
Tension resistant
Not to be opened
Tension resistant
To be opened
Non-tension resistant
Not to be opened
Non-tension resistant
To be opened
Jointing
methods
Situation
Butt weld Electrofusion coupling Ring seal socket Screw threaded joint
without flange bushing
Screw threaded joint
with flange bushing
Expansion socket Flange joint Contraction sleeve Mechanical Coupling
3
3 3 3
3
3 3
3
3

17
Geberit Drainage Systems
Jointing methods
4.1 Butt welding
All diameters from Ø 40 to 315mm can be butt welded.
Connection properties
a Permanent leak free jointing.
b Rigid, non-removable.
c Tension-resistant.
d A simple reliable connection.
Application
Butt welding is the easiest jointing method, providing
the many advantageous benefits of prefabrication;
Geberit HDPE needs no other component in order to
be butt welded.
It can be used in all circumstances where prefabrication
is used on site or in the workshop.
The essential conditions for a perfect weld are:
• Cleanlinessoftheweldingplateandtheparts
that are to be welded.
• Acorrectweldingplatetemperaturewiththegreen
light showing.
• Thecorrectpressureforjointingtheparts.
• Thepartstobeweldedmustbecutsquare<) 90°.
• Thepipesareroundandendsmatch.Onlarger
diameter pipes the use of centering rings may be
required to reform pipes to true circles.
Butt welding takes up little space. The edge of the weld
does not obstruct the pipe, leaving its internal cross-
section virtually unchanged. Even quite complicated
distribution parts can be assembled in a small space,
without wastage of material, because lengths of pipe or
elbow sections can be easily reused through butt welding.
Allowance for butt welds
Butt-weldingcreatesalossinlengthinthemeltingand
joining of the welded ends. This needs to be accounted
for during assembly.
Preparation for butt welding
Pipe must be cut square using pipe cutters or a hand
mitre saw as shown in the diagrams below.
Pipe Cutter
The cutting surface must stay clean, therefore do not
touch the cutting surface with your hands.
Depending on the diameter of the pipe, Geberit HDPE
can be butt welded either by hand or machine.
Hand Mitre Saw
PD (mm) 40-75 90 110 125 160 200 250 315
BW (mm) 3 4 5 5 7 7 8 10
PD = Pipe Diameter BW = Butt Welds
Ø 40 – 160mm
Ø 200 – 315mm
✘

18
5
4
3
2
1
0
246810 12 14
Welding time
Warming-up time
Pipe wall thickness in mm
Welding time in minutes
Visually check the welding joint
Correct
Incorrect:
Out of axial alignment
Incorrect:
Too much pressure at
the start of the welding
procedure
Incorrect:
Uneven welding heat.
✘
✘
1Check temperature
of the welding plate.
Do not start with the
welding procedure
before the green
light is on.
2Only press the pipe
sections at the
beginning against
the welding plate.
Then hold without
pressure. Watch
melting process
carefully.
4Maintain the
maximum pressure
until the welding
seam has cooled
(approximately
30 seconds). Do
not accelerate the
cooling down by
contact with cold
objects or water.
3When melted bulge
is about as big
as half of the wall
thickness, take off
both pipe sections
simultaneously and
quickly press them
carefully together.
Increase welding
pressure until you
attain necessary
pressure (as shown
in the table to the left).
Indicative values for
welding pressure
Ø kg
40 6
50 7
56 8
63 9
75 10
✘
✘
3
4.1.1 Butt welding by hand
(for pipes Ø 40 to 75mm)
Indicative values for welding and warming up times.
A Geberit welding plate KSS-160 or KSS-200,
must be used.
Jointing methods
Geberit Drainage Systems

19
Jointing methods
Geberit Drainage Systems
4.1.2 Butt welding by machine
(for pipes Ø 40 to 315mm)
A Geberit MEDIA 160 or UNIVERSAL 315 welding
machine must be used.
Geberit MEDIA
welding machine 160
Ø 40 to 160mm
1Place pipe parts in
the tension plates
and fix them in a line.
2Press pipe parts
lightly against the
planing disc and cut
the ends until they
are completely clean
and plane. Check the
cut faces by bringing
them together.
3Melt pipe ends
with welding plate
(green light on) until
the melted bulge is
about as big as half
of the wall thickness,
depending on the
size of the pipe.
4Carefully press
together both parts
with necessary
welding pressure
(see table to the
left). Do not release
the locking handle
before the cooling
is complete
(approximately
40 seconds).
Indicative values for welding pressure
Ø kg
40 6
50 7
56 8
63 9
75 10
90 15
Ø kg
110 22
125 28
160 45
200 57
250 90
315 140
Geberit UNIVERSAL
welding machine 315
Ø 40 to 315mm