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BRITISH STANDARD BS EN806-3:2006

Specifications forinstallations inside

buildings conveying

water for human

consumption

Part 3: Pipe sizing Simplified method

The European Standard EN 806-3:2006 has the status of aBritish Standard

ICS 91.140.60

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Contents

Page

Foreword......................................................................................................................................................................3

1 Scope ..............................................................................................................................................................4

2 Normative references ....................................................................................................................................4

3 Terms, symbols and units ............................................................................................................................4

4 Principles of pipe sizing calculations..........................................................................................................5

5 Simplified method of pipe sizing..................................................................................................................6

6

Special-installations ......................................................................................................................................8

Annex A (informative) Example for the determination of pipe sizes for standard-installations .......................9

Annex B (informative) Design flow rates in relation to total flow rates .............................................................12

Annex C (informative) List of national pipe sizing methods...............................................................................14

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Foreword

This European Standard (EN 806-3:2006) has been prepared by Technical Committee CEN/TC 164 Watersupply, 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of an identical text orby endorsement, at the latest by October 2006, and conflicting national standards shall be withdrawn at the latestby October 2006.

NOTE This is the third part of the European Standard (EN 806) consisting of five parts as follows:

Part 1: General

Part 2: Design

Part 3: Pipe sizing

Part 4: Installation

Part 5: Operation and maintenance

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, 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 UnitedKingdom.

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1 Scope

This European Standard is in conjunction with EN 806-1 and EN 806-2 for drinking water systems within premises.

This European Standard describes a calculation method for the dimensioning of pipes for the type of drinking waterstandard-installations as defined in 4.2.

It contains no pipe sizing for fire fighting systems.

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 anyamendments) applies.

EN 806-1, Specifications for installations inside buildings conveying water for human consumption Part 1:General

EN 806-2, Specifications for installations inside buildings conveying water for human consumption Part 2:Design

3 Terms, symbols and units

This Clause is enlarged in completion to EN 806-1, to have in the field of pipe sizing the same definitions inEuropean standards.

Table 1 Terms and definitions

Term Symbol Unit Explanation (definition)

Flow-velocity v m/s

Flow-rate, volume flow Q l/sm3/h

Ratio of the volume of water passing through a specified flowcross-section and the time required for this

Minimum flow-rate at draw-off point Qmin l/s Flow-rate at draw-off point which is just sufficient for theappliance to function

Draw-off flow-rate QA l/s Assumed draw-off flow-rate at appliance for calculationpurposes

Total flow-rate QT l/s QA, sum of all draw-off flow-rates of the water appliancessupplied

Design flow-rate QD l/s Flow-rate for hydraulic calculations, taking into considerationthe probable simultaneous demand

Static pressure pR Pa Gauge pressure at a measuring point in the water supplysystem when no water flowing

Flow pressure pFl Pa Gauge pressure at a measuring point in the water supplysystem when water flowing

Minimum flow pressure pminFl Pa Gauge pressure required at the connection to a draw-off pointat its draw-off flow-rate

Pressure difference, head loss p Pa Difference in pressure between two points in the drinking waterinstallation, resulting from wall friction and individual head loss

(To be continued)

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Table 1 (concluded)

Term Symbol Unit Explanation (definition)

Head loss as a consequence of differencein elevation

pe Pa -

Pipe length I m -

Internal diameter of pipe di mm -

External diameter of pipe da mm -

Wall thickness of pipe s mm -

Loading unit LU 1 Factor taking into account the flow-rate required at anappliance, the length of time the appliance is in use and thefrequency of use. One loading unit (1 LU) equalises a draw-offflow rate QAof 0,1 l/s.

4 Principles of pipe sizing calculations

4.1 General

Pipe sizing takes into consideration the character of the installation, the pressure conditions and the flow velocities.This part includes the underground pipes within the premises.

4.2 Characters of installations

In a building there are standard-installations and special-installations.

An installation can be called a standard-installation, when:

the draw off flow rates do not exceed those set out in Table 2;

the kind of demand does not exceed the design flow-rate as shown in Figure B.1 (see Annex B);

it is not designed for continuous use of water. Continuous use being defined as use lasting more than15 min.

Other installations are called special-installations.

4.3 Pressure conditions

Static pressure at draw off point max. 500 kPa(Exception: garden/garage taps max. 1 000 kPa);

Flow pressure at draw off point min. 100 kPa.

Several draw off points, e.g. thermostatic mixing valves, need a higher flow pressure. Calculations have to considerthis matter.

The difference between the static pressure at the lowest draw off point and the flow pressure at the hydraulic worst-

case draw off point, reduced by the pressure losses (resulting from wall frictions and individual head losses), givethe possible head of difference in elevation within a pressure section.

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4.4 Maximum flow velocities

The figures given in Table 3 are based on the following flow velocities:

header pipes, rising pipes, floor service pipes max. 2,0 m/s;

connection pipes to one fitting (dead legs) max. 4,0 m/s.

NOTE National regulations may require lower flow velocities to avoid water hammer and noise.

5 Simplified method of pipe sizing

5.1 General

This clause shows a possibility for a simplified pipe sizing for standard-installations. This method can be used for alltype of buildings, which do not have measurements, which highly exceed the average. That means that in most of

the buildings the simplified method can be applied.

This method is equally used for cold and for hot water pipes.

5.2 Detailed calculations

The designer is free to use a nationally approved detailed calculation method for pipe sizing (see Annex C).

5.3 Hot water return pipes

As hot water return pipes have to fulfil other hydraulic requirements, they cannot be sized with this method. Theflow-velocity in the hot water return pipes shall be calculated according to national or manufacturers

recommendation.

5.4 Loading unit

1 loading unit (LU) is equivalent to a draw-off flow rate QAof 0,1 l/s.

Table 2 Draw-off flow-rates QA, minimum flow-rates at draw-off points Qminand loading units for draw-off points

QA QminDraw-off point

l/s l/s

Loading units

Washbasin, handbasin,bidet, WC-cistern

0,1 0,1 1

Domestic kitchen sink, -washing machine a, dishwashing machine, sink,shower head

0,2 0,15 2

Urinal flush valve 0,3 0,15 3

Bath domestic 0,4 0,3 4

Taps /garden/garage) 0,5 0,4 5

Non domestic kitchen sinkDN 20, bath non domestic

0,8 0,8 8

Flush valve DN 20 1,5 1,0 15

a For non domestic appliances check with manufacturer.

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The values in this Table do not correspond with the values in product norms. They are only used for pipe sizing.

5.5 Application of the simplified method

Beginning at the last draw-off point, the loading units for each section of the installation have to be determined. Theloading units must be added. The probability of simultaneous demand has been taken into consideration in Tables3.1 to 3.8. Depending on the material chosen by the designer the pipe size can now be taken out of Tables 3.1 to3.8. The design flow-rate QD as given in Figure B.1 is taken into account for the values in Tables 3.1 to 3.8.

Table 3 Loading units for determination of pipe diameters

Table 3.1 Hot-dip galvanised steel

Max. load LU 6 16 40 160 300 600 1 600

Highest value LU 4 15

DN 15 20 25 32 40 50 65

di mm 16 21,6 27,2 35,9 41,8 53 68,8

Max length ofpipe

m 10 6

Table 3.2 Copper

Max. load LU 1 2 3 3 4 6 10 20 50 165 430 1 050 2 100

Highest value LU 2 4 5 8

dax s mm 12x 1,0 15x 1,0 18 x 1,0 22 x 1,0 28 x 1,5 35 x 1,5 42 x 1,5 54 x 2 76,1 x 2

di mm 10,0 13,0 16,0 20,0 25 32 39 50 72,1

Max length of

pipe

m 20 7 5 15 9 7

Table 3.3 Stainless steel

Max. load LU 3 4 6 10 20 50 165 430 1 050 2 100

Highest value LU 4 5 8

dax s mm 15x 1,0 18 x 1,0 22 x 1,0 28 x 1,2 35 x 1,5 42 x 1,5 54 x 1,5 76,1 x 2

di mm 13,0 16,0 19,6 25,6 32 39 51 72,1

Max length of pipe m 15 9 7

Table 3.4 PE-X

Max. load LU 1 2 3 4 5 8 16 35 100 350 700


dax s mm 12 x 1,7 16 x 2,2 20 x 2,8 25 x 3,5 32 x 4,4 40 x 5,5 50 x 6,9 63 x 8,6

di mm 8,4 11,6 14,4 18,0 23,2 29 36,2 45,6

Max length of pipe m 13 4 9 5 4

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Table 3 (concluded)

Table 3.5 PB

Max. load LU 1 2 3 3 4 6 13 25 55 180 500 1 100


dax s mm 12 x 1,3 16 x 1,5 20 x 1,9 25 x 2,3 32 x 3 40 x 3,7 50 x 4,6 63 x 5,8

di mm 9,4 13,0 16,2 20,4 26 32,6 40,8 51,4

Max length of pipe m 20 7 5 15 9 7

Table 3.6 PP

Max. load LU 1 2 3 3 4 6 13 30 70 200 540 970


dax s mm 16 x 2,7 20 x 3,4 25 x 4,2 32 x 5,4 40 x 6,7 50 x 8,4 63 x 10,5 75 x 12,5

di mm 10,6 13,2 16,6 21,2 26,6 33,2 42 50

Max length of pipe m 20 12 8 15 9 7

Table 3.7 PVC-C

Max. load LU 3 4 5 10 20 45 160 420 900


dax s mm 16 x 2,0 20 x 2,3 25 x 2,8 32 x 3,6 40 x 4,5 50 x 5,6 63 x 6,9

di mm 12,0 15,4 19,4 24,8 31 38,8 49,2


Table 3.8 PEX/AL/PE-HD resp. PE-MD/AL/PE-HD

Max. load LU 3 4 5 6 10 20 55 180 540 1 300


dax s mm 16 x 2,25/16 x 2,0 18 x 2 20 x 2,5 26 x 3 32 x 3 40 x 3,5 50 x 4 63 x 4,5

di mm 11,5/12,0 14 15 20 26 33 42 54


For materials not mentioned in the tables, the table with the most similar material and in this table the column withthe most similar or equal diameter shall be chosen.

6 Special-installations

Special-installations are installations, which do not fulfil the conditions for standard-installations or if the buildinghas measurements, which highly exceed the average.

There are installations, where only parts of the project shall be called special-installations. In these cases the partswhich fulfil the conditions for standard-installations can be sized with the simplified method.

Pipes for special-installations shall be sized by nationally approved detailed calculations (see Annex C).

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Annex A(informative)

Example for the determination of pipe sizes for standard-installations

Figure A.1 Example for standard-installation

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Appliance

Beginning at the end of the pipe the loading units must be added. Resulting from this calculation the size of thatpart of the pipe can be determined.

Task according to the drawing

The cold water pipe from the under ground floor to the draw-off points has to be sized.

The pipe shall be in hot-dip galvanised steel.

In every apartment the following draw-off points will be installed:

1 domestic bath

1 WC-cistern

1 washbasin

1 domestic kitchen sink

There are five equal apartments.

Result

Find the loading units from Table 2:

1 domestic bath 4 LU

1 WC-cistern 1 LU

1 washbasin 1 LU

1 domestic kitchen sink 2 LU

Part 1

connected is 1 domestic kitchen sink = 2 LU

Table 3.1 demands for 2 LU = DN 15

Part 2

connected are 1 domestic kitchen sink = 2 LU

1 domestic bath = 4 LU

total = 6 LU


Part 3



1 washbasin = 1 LU

total = 7 LU

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Part 4



1 washbasin = 1 LU

1 WC-cistern = 1 LU

total per apartment = 8 LU


Part 5

connected are 2 apartments = 16 LU


Part 6



Part 7



Part 8



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Annex B(informative)

Design flow rates in relation to total flow rates

The diagram (Figure B.1) shows a possibility to determine the design flow-rate QD from LU for standard-installations. Where nationally approved further such diagrams (e.g. for various types of buildings) may be used.

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Annex C(informative)

List of national pipe sizing methods

The following survey gives information about existing national calculation methods which can be used as analternative to this European Standard or in cases where reasons for differentiated pipe sizing are given e.g. for bigbuildings, industrial and commercial plants etc. If any other national calculation methods exist, which are not listedhere, it is recommended that the national standardization body should give information in the foreword of thenational edition of EN 806-3.

Table C.1 National pipe sizing methods

Country Document No Title

Austria NORM B 2531-2 Trinkwasserversorgungseinrichtungen inGrundstcken; Bemessung der Rohrleitungen

Denmark DS 439 Code of Practice for domestic water supply installations

Finland National Building Code ofFinland, D1

Water supply and drainage installations for buildings Regulations and recommendations 1987

France NF P40-202(ref DTU 60.11)

Rgles de calcul des installations de plomberie sanitaire et desinstallations d'vacuation des eaux pluviales

Germany DIN 1988-3 Technische Regeln fr Trinkwasser-Installationen (TRWI);Ermittlung der Rohrdurchmesser; Technische Regel des DVGW

The Netherlands VEWIN Working SheetsWB 2.1WB 2.1 A

WB 2.1 CWB 2.1 G

Principles of calculation: General and overviewPrinciples of calculation: Flow rate and working pressures fortapware and apparatusPrinciples of calculation: Calculation and design criteriaPrinciples of calculation and tables for determining pressurelosses in pipes

Spain Cdigo Tcnico de laEdificatin, Seccin HS4

PNE 149201

Suministro de aguaAbastecimiento de agua. Dimensionamiento de instalaciones

interiores de agua

United Kingdom BS 6700:1997 Specification for design, installation, testing and maintenance ofservices supplying water for domestic use within buildings andtheir curtilages

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