GE SIGNA Voyager Pre-Installation page 94

Combined Vent Illustration Notes:
1. The distance between the magnet and the tie-in point to the large diameter common pipe
should be minimized as much as possible.
2. The maximum pressure drop for each magnet between the magnet tie-in to the common
pipe and the vent exit to outside shall be less than or equal to 4 psi.
3. An additional pressure drop, equivalent to a standard 90 degree elbow, shall be added to
each magnet branch due to the entrance effect to the common pipe section.
4. Use the hydraulic diameter (instead of pipe diameter) when calculating the pressure drop
after a magnet branch ties-in to common vent pipe until it leaves the edge of the splitter
plate (yellow dashed lines in figure)
5. For a circular cross section of diameter D1, with the divider of height D1:
Hydraulic diameter = (πD1) / (π+2)
6. D2 is typically 8(203) in diameter
94
Illustration 3-21: Combined Vent
(Illustration 3-21
SIGNA Voyager Pre-Installation
Direction 5680008–1EN, Revision 2
is not to scale).
8 Magnet Room Venting Requirements