EN 806-4:2010

SLOVENSKI STANDARD
01-april-2011
Specifikacije za napeljave za pitno vodo v stavbah - 4. del: Inštalacije
Specifications for installations inside buildings conveying water for human consumption -
Part 4: Installation
Technische Regeln für Installationen innerhalb von Gebäuden für Trinkwasser für den
menschlichen Gebrauch - Teil 4: Installation
Spécifications techniques relatives aux installations d'eau destinée à la consommation
humaine à l'intérieur des bâtiments - Partie 4 : Installation
Ta slovenski standard je istoveten z: EN 806-4:2010
ICS:
13.060.20 Pitna voda Drinking water
91.140.60 Sistemi za oskrbo z vodo Water supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 806-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2010
ICS 91.140.60
English Version
Specifications for installations inside buildings conveying water
for human consumption - Part 4: Installation
Spécifications techniques relatives aux installations d'eau Technische Regeln für Trinkwasser-Installationen - Teil 4:
destinée à la consommation humaine à l'intérieur des Installation
bâtiments - Partie 4 : Installation
This European Standard was approved by CEN on 23 January 2010.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 806-4:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .7
4 Work on site .7
4.1 General .7
4.2 Handling of materials.7
4.3 Bending pipes .7
4.4 Jointing of pipes .7
4.4.1 General .7
4.4.2 Pipe materials and jointing methods .8
4.4.3 Boilers and instantaneous water heaters connection . 12
4.5 Joining pipes to cisterns . 12
4.5.1 General . 12
4.5.2 Steel pipes to steel, fibre cement or glass reinforced plastics cisterns . 12
4.5.3 Copper or plastics pipe to steel, fibre cement or glass reinforced plastics cisterns . 12
4.5.4 Concrete cisterns . 13
4.5.5 Thermo-plastics cisterns . 13
4.6 Underground pipe laying . 13
4.7 Pipework in buildings . 13
4.7.1 Allowances for thermal movement and prevention of noise . 13
4.7.2 Pipe fixings . 14
4.7.3 Concealed (hidden) piping . 14
4.7.4 Piping passing through structures . 16
4.7.5 Clearance of structural members . 16
4.7.6 Penetration of fire walls and floors . 17
4.7.7 Drainage and prevention of air locks . 17
4.7.8 Pipe positioning . 17
4.8 Valves and taps . 17
4.9 Identifying and recording piping locations . 17
4.9.1 Location of pipes and valves . 17
4.9.2 Identification of above ground piping. 17
4.9.3 Record of installation . 18
4.9.4 Identification of valves installed above ground . 18
4.10 Water conditioning devices . 18
5 Dissimilar metals. 18
5.1 General . 18
5.2 Combination of pipes and fittings/valves made of different metals . 18
5.3 Flow-direction-rule . 19
6 Commissioning . 19
6.1 Filling and hydrostatic pressure testing of the installations inside buildings conveying
water for human consumption . 19
6.1.1 General . 19
6.1.2 Steel pipes, stainless steel pipes and copper pipes (linear elastic material) . 19
6.1.3 Plastics pipes (elastic or visco-elastic material) . 20
6.2 Flushing the pipework . 23
6.2.1 General procedure . 23
6.2.2 Flushing with water. 23
6.2.3 Flushing procedure with water/air mixture . 24
6.3 Disinfection . 25
6.3.1 General. 25
6.3.2 Selection of disinfectants . 26
6.3.3 Methods for using disinfectants . 26
6.3.4 Disinfection of storage cisterns and distributing pipes . 27
6.3.5 Localised repairs . 27
Annex A (normative) Pipe system material specifications, jointing procedures and pipe
installation for different types of materials. 28
A.1 General. 28
A.2 Connections between different materials . 28
A.2.1 Above-ground pipework . 28
A.2.2 Below-ground pipework . 28
A.3 Ductile iron . 28
A.3.1 General. 28
A.3.2 Types of joints . 28
A.3.3 Jointing procedures . 29
A.4 Stainless steel piping . 29
A.4.1 General. 29
A.4.2 Types of joints . 29
A.4.3 Preparation of tube . 30
A.4.4 Corrosion . 31
A.5 Hot dip galvanised steel piping . 31
A.5.1 General. 31
A.5.2 Types of joints . 31
A.5.3 Welded joints . 32
A.5.4 Corrosion . 32
A.6 Copper piping . 32
A.6.1 General. 32
A.6.2 Categories of joints . 32
A.6.3 Jointing procedures . 33
A.6.4 Bending. 36
A.6.5 Drift expanding . 36
A.6.6 Corrosion . 36
A.7 Plastic piping . 36
A.7.1 Types of joints . 36
A.7.2 Preparation of pipe . 37
A.7.3 Fused joints . 37
A.7.4 Solvent cement fittings . 38
A.7.5 Compression fittings . 39
A.7.6 Push-fit fittings . 40
A.7.7 Flanged fittings . 40
Annex B (informative) Calculation and compensation for thermal effects of pipes . 42
B.1 Thermal expansion of metal pipes . 42
B.2 Thermal expansion of plastics pipes . 43
B.3 Positioning of anchor points . 44
B.4 Installation of pipes allowing expansion by means of a flexible arm . 44
B.5 Installation of pipes allowing expansion by means of an expansion loop . 46
B.6 Installation of pipes allowing expansion and with continuous support and guide brackets . 47
B.7 Installation of pipes allowing expansion and with guide brackets . 48
B.8 Installation of pipes on continuous horizontal supports . 48
B.9 Installation of pipes not allowing expansion . 48
B.10 Positioning of anchor points . 49
B.11 Installation between anchor points where continuous pipe stiffening is provided (PE-X,
PB, PP and PE) . 49
B.12 Installation of pipes supported only at the anchor points (for PE-X, PB, PP and PE) . 50
Annex C (informative) Recommended maximum spacings of fixings for metal pipes . 52
Bibliography . 53
Foreword
This document (EN 806-4:2010) has been prepared by Technical Committee CEN/TC 164 “Water Supply”, the
secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by September 2010, and conflicting national standards shall be
withdrawn at the latest by September 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document is intended for the use of engineers, architects, surveyors, contractors, installers, water
suppliers, consumers and regulatory authorities.
This standard has been written in the form of a practice specification. It is the fourth part of a European
Standard consisting of five parts as follows:
 Part 1: General
 Part 2: Design
 Part 3: Pipe sizing — Simplified method
 Part 4: Installation
 Part 5: Operation and maintenance
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

1 Scope
This European Standard specifies requirements and gives recommendations for the installation of potable
water installations within buildings and for pipework outside buildings but within the premises in accordance
with EN 806-1. This European Standard is applicable to new installations, alterations and repairs.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 200, Sanitary tapware — Single taps and combination taps for water supply systems of type 1 and type 2
— General technical specification
EN 545:2006, Ductile iron pipes, fittings, accessories and their joints for water pipelines — Requirements and
test methods
EN 681-1, Elastomeric seals — Material requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber
st nd rd
EN 751-1, Sealing materials for metallic threaded joints in contact with 1 , 2 and 3 family gases and hot
water — Part 1: Anaerobic jointing compounds
st nd rd
EN 751-2, Sealing materials for metallic threaded joints in contact with 1 , 2 and 3 family gases and hot
water — Part 2: Non-hardening jointing compounds
st nd rd
EN 751-3, Sealing materials for metallic threaded joints in contact with 1 , 2 and 3 family gases and hot
water — Part 3: Unsintered PTFE tapes
EN 805, Water supply — Requirements for systems and components outside buildings
EN 806-1:2000, Specifications for installations inside buildings conveying water for human consumption —
Part 1: General
EN 806-2, Specification for installations inside buildings conveying water for human consumption — Part 2:
Design
EN 817, Sanitary tapware — Mechanical mixing valves (PN 10) — General technical specifications
EN 1044, Brazing — Filler metals
EN 1057, Copper and copper alloys — Seamless, round copper tubes for water and gas in sanitary and
heating applications
EN 1092 (all parts), Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated
EN 1111, Sanitary tapware — Thermostatic mixing valves (PN 10) — General technical specification
EN 1254-1, Copper and copper alloys — Plumbing fittings — Part 1: Fittings with ends for capillary soldering
or capillary brazing to copper tubes
EN 1254-2, Copper and copper alloys — Plumbing fittings — Part 2: Fittings with compression ends for use
with copper tubes
EN 1254-4, Copper and copper alloys — Plumbing fittings — Part 4: Fittings combining other end connections
with capillary or compression ends
EN 1254-5, Copper and copper alloys — Plumbing fittings — Part 5: Fittings with short ends for capillary
brazing to copper tubes
EN 1514-1, Flanges and their joints — Dimensions of gaskets for PN-designated flanges — Part 1: Non-
metallic flat gaskets with or without inserts
EN 1717:2000, Protection against pollution of potable water in water installations and general requirements of
devices to prevent pollution by backflow
EN 10088-2, Stainless steels — Part 2: Technical delivery conditions for sheet/plate and strip of corrosion
resisting steels for general purposes
EN 10226 (all parts), Pipe threads where pressure tight joints are made on the threads
EN 10240, Internal and/or external protective coatings for steel tubes — Specification for hot dip galvanized
coatings applied in automatic plants
EN 10242, Threaded pipe fitting in malleable cast iron
EN 10255, Non-Alloy steel tubes suitable for welding and threading — Technical delivery conditions
EN 10312, Welded stainless steel tubes for the conveyance of aqueous liquids including water for human
consumption — Technical delivery conditions
EN 13443-1, Water conditioning equipment inside buildings — Mechanical filters — Part 1: Particle rating 80
µm to 150 µm — Requirements for performances, safety and testing
EN 15161, Water conditioning equipment inside buildings — Installation, operation, maintenance and repair
EN 29454-1:1993, Soft soldering fluxes — Classification and requirements — Part 1: Classification, labelling
and packaging (ISO 9454-1:1990)
EN 60335-1, Household and similar electrical appliances — Safety — Part 1: General requirements (IEC
60335-1:2001, modified)
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation (ISO 228-1:2000)
EN ISO 4016, Hexagon head bolts — Product grade C (ISO 4016:1999)
EN ISO 4034:2000, Hexagon nuts — Product grade C (ISO 4034:1999)
EN ISO 7091, Plain washers — Normal series — Product grade C (ISO 7091:2000)
EN ISO 9453, Soft solder alloys — Chemical compositions and forms (ISO 9453:2006)
EN ISO 15874-3, Plastics piping systems for hot and cold water installations — Polypropylene (PP) — Part 3:
Fittings (ISO 15874-3:2003)
EN ISO 15875-3, Plastics piping systems for hot and cold water installations — Crosslinked polyethylene (PE-
X) — Part 3: Fittings (ISO 15875-3:2003)
EN ISO 15876-3, Plastics piping systems for hot and cold water installations — Polybutylene (PB) — Part 3:
Fittings (ISO 15876-3:2003)
EN ISO 15877-3, Plastics piping systems for hot and cold water installations — Chlorinated poly(vinyl
chloride) (PVC-C) — Part 3: Fittings (ISO 15877-3:2009)
EN ISO 21003-3, Multilayer piping systems for hot and cold water installations inside buildings — Part 3:
Fittings (ISO 21003-3:2008)
IEC 60449, Voltage bands for electrical installations of buildings
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 806-1:2000 and EN 1717:2000 apply.
4 Work on site
4.1 General
This Clause gives requirements and recommendations on how installation work should be carried out in order
to ensure the system fulfils its requirements for long-term safe and economic use and maintain environmental
sustainability.
All products shall comply with the relevant product standards and, while awaiting the adoption of verifiable
European criteria, with the national regulations.
4.2 Handling of materials
Pipes, fittings and other components shall be protected, handled and stored carefully to avoid damage and to
prevent contamination by dirt, building materials, vermin and other extraneous matter.
Manufacturers' advice shall be followed concerning how their products should be loaded, transported,
unloaded and stored.
4.3 Bending pipes
Bending of a straight pipe shall be carried out by using purpose designed equipment.
When forming bends, care shall be taken to avoid rippling and throating and restricting the diameter of pipes
when forming bends.
Bent pipes shall be inspected for damage before use.
Hot dipped zinc coated steel pipes over DN 50 shall not be bent (see EN 10240 and EN 10255).
4.4 Jointing of pipes
4.4.1 General
All joints shall be made in accordance with the relevant standards and the manufacturer's instructions. Care
shall be taken to establish satisfactory jointing techniques for all water service pipework. Pipes shall be cut at
right angles to their axes. Burrs and ridges shall be removed before assembling a joint. If gouges, splits or
damage to the pipe end are apparent, the end of the pipe should be re-cut to remove them. Materials used to
make the joint should be prevented from entering the waterways. All pipes and fittings shall be internally clean
and free from particles of sand, soil, metal filings and chips, etc.
All pipe joints shall be permanently watertight. Pipe joints shall be clad, plastered over or otherwise covered
only after having been pressure tested (see 6.1), unless national regulations require accessibility of certain
joints, then compliance with those national regulations shall be achieved.
During installation all inlets and outlets of finished or partly finished pipework, to which draw off fittings or other
components have not yet been connected, shall be tightly closed with stoppers, caps or blind flanges. Closed
stop valves shall not count as tight closures.
When the installation is complete, flushing shall be carried out (see 6.2) to remove dust, debris and flux
residues. Disinfection should also be undertaken when necessary (see 6.3).
All components shall be prepared in accordance with the relevant European Standards. Where threaded joints
are used on metallic components, the sealing materials shall comply with EN 751-1, EN 751-2 and EN 751-3.
Where threaded joints are used on plastic components, the sealing materials shall comply with EN 751-3.
For pipes in buildings and buried pipes within the premises, all joints shall be of endload bearing type.
4.4.2 Pipe materials and jointing methods
A listing of different jointing methods for different pipe materials and connection joints is listed in the following
tables:
 Table 1: Jointing methods for metallic pipes;
 Table 2: Jointing methods for plastics pipes (PE-X, PE, PVC-U);
 Table 3: Jointing methods for plastics pipes (PVC-C, PP, PB);
 Table 4: Jointing methods for multilayer pipes.

Table 1 — Jointing methods for metallic pipes
Material for pipes
Hot dip galvanised steel
Ductile Iron Stainless Steel Copper
(HDGS)
Available jointing methods
for metallic piping systems
Materials for fittings
Hot dip galvanised malleable
Ductile Iron Stainless steel and brass Copper and copper alloys
cast iron
Soldering - - - X
d d c
Brazing - X X X
d c
Welding - X - X
a b b b
Threaded joint X X X X
Compression fittings - X X X
Press-fit fittings - X - X
Sockets with elastomeric
X - - -
sealing ring and spigot ends
Push fit joint X X X X
Flanges X X X X
b b b b
Demountable unions X X X X
NOTE   For written description of jointing methods, see Annex A.
a   Thread in accordance with either EN 10226-1 or EN 10226-2
b   Thread on transition fittings
c   See national regulations and standards.
d   Corrosion risks have to be considered, see also national regulations and standards.
X   Existing
-   Not existing
Table 2 — Jointing methods for plastics pipes (PE-X, PE, PVC-U)
Material for pipes
PE-X PE (cold water only) PVC-U
Available jointing methods
Material for fitting
for plastics piping systems
Plastic Metallic Ductile Malleable Copper POM PP PE Ductile PVC-U
fittings fittings Iron Cast Iron alloys Iron
Welding (electro fusion, - - - - - - - X - -
butt… fusion…)
Solvent cemented joints - - - - - - - - - X
a b b b b b b b b b
Threaded joint  X X X X X X X X - X
Compression fittings X X X X X X X - X X
Crimped / Press-fit fittings X X - - - - - - - -
Sockets with elastomeric
- - X X - X - X X X
sealing ring and spigot ends
Push fit joint X X - - X - - - - -
Flanges X X X X X - X X X X
Demountable unions X X - X X - - X X X
NOTE   For written description of jointing methods, see Annex A.
a  Thread in accordance with either EN 10226-1 or EN 10226-2
b  Thread on transition fittings
X  Existing
-  Not existing
Table 3 — Jointing methods for plastics pipes (PVC-C, PP, PB)
Materials for pipes
PVC-C PP PB
Material for fittings
Available jointing methods for
Metallic
Plastic Plastic
plastics piping systems
fittings,
Stainless Copper fittings fittings Metallic
PVC-C except CU PP PB
Steel Alloys other than other than fittings
and CU
PP PB
alloys
Welding - - - - - X - - X
Solvent cemented joints - - X - - - - - -
a b b b b b b b b b
Threaded joint X X X X X X X X X
Compression fittings X X - X X X X X X
Crimped / press-fit fittings - - - - - - X X -
Sockets with elastomeric sealing
- - - - - - - - -
ring and spigot ends
Push fit joint - - - X X - X X X
Flanges X X X X X X X X X
Demountable unions X X X X X X X X X
NOTE For written description of jointing methods, see Annex A.
a  Thread in accordance with either EN 10226-1 or 10226-2
b  Thread on transition fittings
X  Existing
-   Not existing
Table 4 — Jointing methods for multilayer pipes
Available jointing method Material for fittings
Plastic fittings Metallic fittings
Welding X -
a b b
Threaded joint X X
Compression fittings X X
Crimped / press-fit fittings X X
Push fit joint X X
Flanges X X
Demountable unions X X
a  Thread in accordance with EN 10226-1 and 10226-2
b  Thread on transition fittings
X  Existing
-   Not existing
NOTE Multilayer pipes are not mentioned in EN 806-2.
4.4.3 Boilers and instantaneous water heaters connection
Boilers and instantaneous water heaters shall not be connected directly to plastics pipework where the safety
devices allow short term (< 10 s) maximum temperatures higher than 95 °C and a water pressure higher than
the maximum design pressure (MDP) (< 10 %).
4.5 Joining pipes to cisterns
4.5.1 General
Where appropriate, cisterns shall be fully supported across the base to avoid deformation when filled and to
avoid undue stress on the pipe connections. Holes shall be correctly positioned for the connection of pipes to
cisterns. Holes shall not be cut with flame cutters. Where practicable, all outlets from a cistern should be taken
from the bottom of the cistern to prevent the retention of sediment. All debris, fillings, borings and blanks shall
be removed from the inside of the cistern.
4.5.2 Steel pipes to steel, fibre cement or glass reinforced plastics cisterns
The threaded end of the pipe shall be secured in the hole in the cistern either by backnuts and washers both
inside and outside (soft washers being used additionally with glass reinforced plastics and fibre-cement
cisterns or where there are irregular surfaces) or by using bolted or welded flanged connections.
4.5.3 Copper or plastics pipe to steel, fibre cement or glass reinforced plastics cisterns
A copper alloy connector, having a shoulder to bear on the inside, of the cistern and secured by a backnut to
the outside shall be used. Corrosion resistant support washers shall be used both on the inside and the
outside of the cistern, additional soft washers shall be used as in 4.5.2.
Because of the risk of galvanic corrosion of the cistern connection of copper pipework to galvanized steel
cisterns shall be avoided (see Clause 5).
4.5.4 Concrete cisterns
Connections to concrete cisterns shall be made preferably by the use of short thread flanged connections
having an anchor flange (fixing point) either cast or welded on. Alternative suitable methods of connection can
be used. Care shall be taken to ensure that the connections are properly aligned both in the horizontal and
vertical planes when being cast into the concrete, which shall be compacted around the anchor flange to
ensure a watertight joint.
4.5.5 Thermo-plastics cisterns
The following detailed items shall be followed in accordance with the manufacturer's instructions.
Pipes shall be carefully connected to plastics cisterns and supported to avoid distortion of the cistern.
Scribing tools shall not be used to scratch or mark the position of a hole to be cut in a plastics cistern.
Holes for pipes shall be cut in plastics cisterns with a tank cutting bit or hole saw. They shall be truly circular,
having clean edges and be free from notches. The cistern wall shall be supported during the cutting operation
by a wooden or other suitable strut.
A supporting back plate shall be used on the outside of the cistern where the float-operated valve is fitted, to
spread the thrust of the lever arm over a greater area of the side wall. Corrosion resistant support washers
shall be used both on the inside and the outside of the cistern with additional soft washers.
4.6 Underground pipe laying
Requirements for underground pipe laying within the curtilage of the building shall be in accordance with those
specified in EN 805.
Where ground contamination is encountered or suspected suitable impermeable pipework shall be used or the
pipe shall be sleeved. No pipe susceptible to deterioration by contact with any substance shall be laid or
installed in a place where such deterioration is likely to occur.
Every underground pipe entering a building shall do so with due regard to frost protection and accessibility.
Where a pipe enters a building it shall be accommodated in a suitable sleeve that prevents the passage of
water, gas or vermin, i.e. the ends of the sleeve shall be sealed.
4.7 Pipework in buildings
4.7.1 Allowances for thermal movement and prevention of noise
In installations that do not have limited straight runs and many bends and offsets, allowance for expansion
and contraction of the pipes shall be made by:
 forming expansion loops;
 introducing changes of direction to avoid long straight runs;
 fitting proprietary expansion joints.
In installations with limited straight runs and many bends and offsets, thermal movement is accommodated
automatically.
Where applicable, pipes should be fitted clear of joints, beams, floor boards and other pipes. Where this is not
possible, pads of insulating material should be fitted between the pipe and the structure to minimise noise.
At all times, installations shall be such as to minimize noise and in accordance with national regulations.
4.7.2 Pipe fixings
4.7.2.1 General
Pipe support should be designed to provide a permanent fixing. Where fittings such as valves and manual
controls are used, these should be firmly anchored to minimise any movement imparted to the pipe by
operations of hand wheels or levers for example.
Support spacing should be given in accordance with the manufacturer's installation instructions or local and
national regulations. Where clamps are used the function of the piping system shall not be affected.
Pipe brackets are designed to secure pipes directly to the structure and shall not be used to fix components.
The parts of the structure to which brackets are fastened shall have adequate strength, or be strengthened.
4.7.2.2 Spacings for pipe fixings
The spacings for fixings for internally located piping should be in accordance with the recommendations of the
producers and, if missing, with Annex B and Annex C.
4.7.2.3 Fixings for copper and stainless steel pipe
Where required, clips or brackets made of suitable materials that fulfil the requirements for fire and noise
protection shall be used. Galvanised clips shall not be used for fixing copper and stainless steel pipes unless
insulated.
For spacings, see Annex C.
4.7.2.4 Fixings for hot dipped galvanised steel pipe
Where required, hot dipped galvanised steel piping shall be secured by suitable plastic or steel clips or
brackets that fulfil the requirements for fire and noise protection. Copper clips or brackets shall not be used for
fixing steel piping.
4.7.2.5 Fixings for plastics and multilayer pipes
Plastics piping shall be secured by suitable metal or plastic clips or brackets. Allowance shall be made for free
axial movement within the clips and brackets, except for anchor points (see Annex B).
Annex B shows the calculation method of and means of compensation of thermal effects for metals, PE,
PVC-U, PVC-C, PE-X, PP and PB.
4.7.2.6 Fixings for insulated piping
Piping that is or is to be insulated shall be secured with clips or brackets that allow sufficient space between
the pipe and the surface (batten or wall) to which the pipe is fixed for the insulation to be properly installed.
4.7.3 Concealed (hidden) piping
4.7.3.1 General
If national regulations require accessibility of certain joints, then compliance with those national regulations
shall be met.
4.7.3.2 Pipes laid within protective pipes and/or insulation
This piping shall be housed in properly constructed builders work floor ducts or wall chases and where
possible access for maintenance and inspection shall be provided.
Where pipes in protective pipes and/or insulations are embedded within the fabric of the building (e.g.
concrete floors and walls) it is important to ensure that deformation or displacement does not occur and that
no liquid concrete can enter the annular gap.
Protective pipes in floors shall be cut off at a minimum distance above the finished floor level of 30 mm to
avoid liquid ingress.
Protective pipes carrying plastics pipes should be laid with bending radius not less than eight times the
outside diameter of the water carrying pipe.
When plastics pipes are installed in protective pipes thermal expansion is automatically accommodated but it
is advisable to fix the pipe and the protective pipe where they emerge from the wall or floor.
4.7.3.3 Plastics pipes and protective pipes hanging or looping free
Pipes carrying hot water will expand with heat. When these pipes are hanging or looping free within wall or
floor constructions, the ends of the pipes shall be fixed where they emerge from the structure as shown in
Figure 1.
a) Individual junctions
b) Single distribution lines
c) Closed loop distribution system
Figure 1 — Pipes hanging or looping free
4.7.4 Piping passing through structures
Structural elements shall not be notched or bored in such a way that the integrity of the structure is
compromised.
4.7.5 Clearance of structural members
Piping laid through notches, holes, cut-outs or chases shall not be subjected to external forces and shall be
free to expand or contract. Piping passing through walls and floors shall be sleeved.
4.7.6 Penetration of fire walls and floors
Pipework penetration of compartment walls, floors and fire barriers shall not adversely affect their integrity and
shall be installed in accordance with national or local regulations.
4.7.7 Drainage and prevention of air locks
Pipes shall be laid so as to prevent the formation of air locks; drainage fittings shall be provided at the lowest
points of the system. Where pipes are likely to suffer frost damage they can be drained or protected by other
methods, e.g. electrical trace heating.
4.7.8 Pipe positioning
Where pipes for hot and cold potable water are arranged one above another, the hot water pipe shall be
located above the cold water pipe.
4.8 Valves and taps
All installed sanitary taps shall conform to the relevant product standards, e.g. EN 200, EN 817, EN 1111 and
shall be provided with protection against backflow and back siphonage in accordance with EN 1717.
Valves and hose taps shall be installed in accordance with EN 806-2, EN 1717 and national regulations.
Taps not fixed directly to an appliance shall be fixed to a suitable pipe fitting and the fitting, or the pipe
immediately adjacent to the tap, shall be firmly secured to a suitable support, to prevent strain on the pipe and its
joints when the tap is operated.
Locate taps and pipes in such a way as to reduce stagnation.
4.9 Identifying and recording piping locations
4.9.1 Location of pipes and valves
Valves shall be accessible for service and maintenance.
Supply pipes and valves shall be marked to indicate the service they carry except in the case of single family
dwellings.
Pipes carrying and taps providing reclaimed water shall be ma
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