Strebel S-WG 100, Installation, Operating And Maintenance Manual, Page: 56 / 125

E09.012.246 Manual S-WG
57
So for this system, sizes of at least 54

1.5 [mm

mm] are to be applied for all pipes directly connected to the
water heaters and tanks, and pipes sized at least 106

2.5 [mm

mm] for the flow and return connections be-
tween the cascaded water heaters and the tanks. The pipes F2 and R2 must be at least 93

2.3 [mm

mm].
Equivalent length:
From table EL :
The maximum total length of flow and return pipes 106

2,5 [mm

mm] is 36,7 m.
So when 106

2,5 [mm

mm] is applied, the physical distance between water heaters and tanks may be half of
this,
so ~ 18 m, at max. In case bends and/or valves are used, this distance becomes less than 18 m. Use the table.
1 2 3
= 54 x 1.5
= 93 x 2.3
= 106 x 2.5
1 2 3 4 5
R
F
R
F