Embedded Files
This section covers the design requirements for Cold Water Systems
This section covers the design requirements for Cold Water Systems
Water Regulations Guide Book
BS 6700 Design and Installation
BSEN 806 in 5 parts
Approved Document G
This list above is not exhaustive however, it covers a range of documentation that will be required when designing a Cold Water System to a single or multi occupancy dwelling.
Single Occupancy Dwelling
Single Occupancy Dwelling
A house (or flat) that is occupied by a family
Multi Occupancy Dwelling
Multi Occupancy Dwelling
A collection of flats or apartments that is occupied by single families in a large building
First Steps of Design
First Steps of Design
Installation #001
Installation #001
The first thing to do is to make a drawing of the proposed pipe layout, preferably on scale plans so that measurements of pipe lengths and changes in level can be shown. Then, number each branch and discharge point that needs to be sized, from the water main or cistern, to give an easy reference. For example the section of tube from the water main to the branch entering flat 1 is referenced 1-2, see Figure 5 hot and cold water systems diagram. The reference numbers are then transferred to column 1 on the tabulation chart, see Table 2. Loading units Next we have to determine the loading units for each referenced pipe, for example: pipe 2-3 serves all the fittings in flat 2 and so has a value of:
Bathroom 3/4" bath taps 2 @ 10 = 20
1/2"basin taps 2 @ 1.5 = 3
WC cistern 1 @ 2 = 2
En-suite Shower 2 @ 3 = 6
Kitchen 1/2" sink taps 2 @ 3 = 6
15mm w/machine taps 2 @ 3 = 6
Cloaks Basin spray tap 1 @ 0 = 0
WC cistern 1 @ 2 = 2
Total loading units 45
Table 3 — Loading units for determination of pipe diameters
Table 3 — Loading units for determination of pipe diameters
Application of the simplified method
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. The loading units must be added. The probability of simultaneous demand has been taken into consideration in Tables 3.1 to 3.8. Depending on the material chosen by the designer the pipe size can now be taken out of Tables 3.1 to 3.8. 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.
This clause shows a possibility for a simplified pipe sizing for standard-installations. This method can be used for all type 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.
Figure B.1 — Design flow rate Q D in l/s for standard-installations in relation to the total flow rate Q T in LU
Key:
1 Design flow rate Q D
2 Total flow rate Q T in LU
3 Example of highest single value LU
Figure B1 from BSEN 806
Figure B1 from BSEN 806
Diagram of the Installation Installation #001
Diagram of the Installation Installation #001
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