Page 3
Medium pipe
Mass (kg/m)
Heavy pipe
Mass (kg/m)
M1
5.3
M1
6.1
M2
10.3
M2
11.8
M3
15.6
M3
17.8
M4
20.6
M4
23.6
Table 3: Approximate masses per linear metre of Dunham Strip without accessories
INSTALLATION
Refer to the Dunham-Bush BL drawing provided.
Fixing
Leave sufficient clearance at each end, to make pipe
connections. Fit sliding brackets at 3m centres to
suit fixing points and adjustable hanger rods
previously installed. Lift and position each panel into
the brackets.
Grading
Grade each run by means of adjustable drop rods
Hot water installations are usually graded to a
minimum 1:250 in the direction of flow, to the highest
point of the return main, which should have an air
vent. Steam installations must be graded to a
minimum 1:200 in the direction of flow, down to a
suitable steam trap.
Cover Plates and End Closers
If supplied, fit cover plates to joints between
individual lengths and fit end closers at the end of
each run or between individual strips. Fix using
screws, lock nuts and washers supplied.
Cover plates cannot be used with MF or HF (flanged
connection) type panels.
Pipework Connections
The system should be designed to allow for
expansion of radiant panels. Refer to the mechanical
services drawings.
Connections will be supplied as specified, from a
choice of plain ends for welding, screwed ends for
use with unions or flanged ends.
The position of flow and return connections will
depend upon the circuitry of the installation. Tubes
should be connected in parallel to minimise bowing
due to differential expansion. Expansion
compensators, expansion loops or floating pipe
connections should be used depending on the size
and layout of the system,.
N.B. Sliding brackets are designed to give variable
installation position only, not to accommodate
expansion movement i.e. hanging rods should be
long enough to allow for expansion movement
Diagram 3: Cover plate CP1 for M1 Dunham Strip
Diagram 4: End closer EC1 for M1 Dunham Strip
COMMISSIONING
Fill and vent the systems and pressure test in
accordance with recognised practice.
Adjust the water volume flow rate in each circuit by
means of balance valves to obtain the specified
water temperature drop.
With the system operational, check that the strip is
not distorted due to expansion movement.
Pipe Type
Cold
test pressure
(barg)
Max. working
pressure
(barg)
Plain ends
(for welding)
25
17
Screwed ends
1¼” BSP taper
21
14
Flanged ends
25
17
Table 2: Site test and working pressures
