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4.4.1
Discharge pipe D2
The discharge pipe (D2) from the
Tundish should:
- "have a vertical section of pipe at
least
300mm
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
temperatures
discharged and is clearly and
permanently marked to identify
the
product
standard"
long
below
the
withstanding
of
the
water
and
performance
Figure 3: Typical discharge pipe arrangement
Pre-Installation
Dimplex strongly recommends the use
of metal pipework only and Dimplex
does not take responsibility for any
damage caused from discharges.
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 3, Table 4
example.
Note: An alternative approach for
sizing discharge pipes would be to
follow Annex D, section D.2 of BS
6700:2006 + A1:2009).
and the worked
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