l instructions provided in this chapter, the steam outlet hoses are aimed upwards and the distributor
has an upwards slope of at least 2°;
l any curves in the pipes or hoses are sufficiently wide (radius > 300 mm - 12 in) so as to not cause
bending or choking;
l the paths of the steam hose and condensate pipe comply with the instructions provided in this
chapter;
l the slope of the steam hose is sufficient to allow correct condensate drainage (> 20° for upward
sections,> 5° for downward sections);
l the slope of the condensate drain pipe is at least 5° at every point;
l the condensate drain pipe is fitted with a drain trap (filled with water before starting) to prevent
steam from escaping.
Fig.3.e Fig.3.f
Fig.3.g
3.7
Outlet pressure
limits
The back-pressure at the boiler outlet, either positive or negative, depends both on the relative pressure
in the duct/AHU and the pressure drop in the steam hose, due to bends or adapters, and the steam
distributor. Carel steam hoses have a pressure drop of around 150 Pa/m (0.021 psi) (in compliance with
the maximum flow-rate recommended by Carel). Carel DP* series linear distributors have a pressure
drop of around 25 Pa (0.003psi) (in compliance with the maximum flow-rate recommended by Carel).
Considering these values, the boiler outlet pressure must be:
l boiler outlet pressure > 150 [Pa/m]* steam hose length [m] + 25 [Pa] DP + pressure in duct/AHU [Pa]
Boiler outlet pressure values for gaSteam:
UG045 UG090 UG150 UG180 UG300 UG450
pressure limits at boiler outlet Pa (PSI) 0 to 2000 (0 to 0.290)
Tab.3.d
Note: a pressure of around -200 Pa (-0.029 psi) at the boiler outlet corresponds to around 20 mm
28|3. Steam distribution
gaSteam - UG +0300090EN rel. 1.2– 09.10.2018
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