Viessmann Vitocell 200 Cylinder Design, Installation, User & Servicing Instructions page 12

iNSTALLATiON
Typical Discharge Pipe Arrangement
15 mm
discharge
pipe
500 mm max.
P & T
Relief
Valve
300 mm
min.
22 mm metal pipe with continuous
fall up to 9m equivalent length (D2).
NOTES:
The discharge will consist of scalding
water and steam. Asphalt, roofing felt
and non-metallic rainwater goods may
be damaged by such discharges.
It is not acceptable to discharge straight
into a soil pipe.
Locations to be avoided when siting a discharge
pipe at high level:
The example below is for G1/2 temperature relief valve with a discharge pipe (D2)
1. The discharge pipe should not be located
having 4 elbows and length of 7m from the tundish to the point of discharge. above a pedestrian area, or above a window,
door, ventilator etc.
From the table below:
2. Subsequent freezing of the discharge
should not create a hazard to persons
about the building.
Maximum resistance allowed for a straight length of 22mm copper discharge pipe
3. The adjacent structure should be impervious
(D2) from a G1/2 temperature relief valve is: 9m subtract the resistance for 4 x 22mm
to water at 80ºC.
elbows at 0.8m each = 3.2m.
Therefore the maximum permitted length equates to: 5.8m.
5.8m is less than the actual length of 7m therefore calculate the next largest size.
Maximum resistance allowed for a straight length of 28mm pipe (D2) from a G1/2
temperature relief valve equates to: 14m.
As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.
Sizing of copper discharge pipe 'D2' for a temperature relief valve
with a G1/2 outlet size (as supplied)
Size of discharge
pipework
22mm
28mm
35mm
Expansion
relief
valve
Dotted line showing
alternative route with
single tundish being used
Discharge below
fixed grating
WORKED EXAMPLE
Deduct the figure below
Maximum length of from the maximum
straight pipe length for each bend or
(no bends or elbows) elbow in the discharge
Up to 9m
Up to 18m
Up to 27m
Pressure & Temperature/expansion Relief
Valve Pipework
The relief valve should be installed to discharge
in accordance with G3 of the Approved
Document of the Building Regulations and
should be piped to where it is visible, but will
not cause danger to persons or damage to
materials.
The following information is taken from
Approved Document G3 of the Building
Regulations and is provided to assist with
the design and installation of the discharge
pipework. However, the information is not
exhaustive and reference should always be
made to Approved Document G3 of the Building
Regulations. The final decision regarding any
arrangements rests with Building Control and
it is recommended that their advice is sought
if you have any concerns regarding this aspect
Fixed
of the installation.
Grating
The two safety valves will only discharge
water under fault conditions. When operating
normally water will not be discharged.
Trapped gully
The tundish should be vertical, located in the
same space as the unvented hot water storage
system and be fitted as close as possible and
within 500mm of the safety device e.g. the
temperature relief valve.
The discharge pipe (D2) from the tundish should
terminate in a safe place where there is no risk
to persons in the vicinity of the discharge, be
of metal and:
x= dia. of discharge
a) Be at least one pipe size larger than the
pipe
nominal outlet size of the safety device unless
its total equivalent hydraulic resistance
exceeds that of a straight pipe 9m long
i.e. discharge pipes between 9m and 18m
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. Refer to the table and
the worked example.
An alter native approach for sizing
discharge pipes would be to follow BS6700
Specification for design installation, testing
and maintenance of services supplying water
for domestic use within buildings and their
curtilages.
pipe
0.8m
b) Have a vertical section of pipe at least
300mm long, below the tundish before any
1m
elbows or bends in the pipe work.
1.4m
c) Be installed with a continuous fall.
Page 12