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Pre
-
Installation
HP Installation and User Instructions R00918
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1 03/11
Page 9
4.4.1 Discharge pipe D2
The discharge pipe (D2) from the
Tundish should:
- “have a vertical section of pipe at
least 300mm long below the
tundish before any elbows or
bends in the pipework and be
installed with a continuous fall of
at least 1 in 200 thereafter.”
The discharge pipe (D2) should be
made of:
- “metal; or other material that has
been demonstrated to be capable
of safely withstanding
temperatures of the water
discharged and is clearly and
permanently marked to identify
the product and performance
standard”
The discharge pipe D2 should be at
least one pipe size larger than the
nominal outlet size of the safety
device unless its total equivalent
hydraulic resistance exceeds that of a
straight pipe 9m long, i.e. for
discharge pipes between 9m and 18m
the equivalent resistance length
should be at least two sizes larger
than the nominal outlet size of the
safety device; between 18 and 27m at
least 3 sizes larger, and so on; bends
must be taken into account in
calculating the flow resistance. See
Figure 2, Table 2 and the worked
example.
Note: An alternative approach for
sizing discharge pipes would be to
follow Annex D, section D.2 of BS
6700:2006 + A1:2009).
Figure 2: Typical discharge pipe arrangement
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