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Siemens MAGNETOM Skyra Owner's Manual Page 19

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Quench
syngo MR D13
Safety information for the system owner
Quench emergency plan
It is strongly recommended that the system owner establishes
an emergency plan in case gaseous helium escapes into the
examination room.
The emergency plan should include the following information:
Rescue scenarios that can be practiced with personnel
Room-related conditions
Rescue personnel (safety personnel, paramedics and fire-
men)
During a quench, the super-conductivity of the magnet is sus-
A . 1
pended. The energy of the magnetic field is converted into heat.
The magnet field strength falls off to 20 mT within approx.
20 seconds. The liquid helium (coolant) boils off during this pro-
cess and is released to the outside via the exhaust vent line. The
escape of gaseous helium via the exhaust line is rather noisy
(hissing, gurgling).
A quench may occur as follows:
Start-up of the MR system (ramping up or filling the mag-
net)
An accident (earthquake, fire, etc.)
Spontaneously without any obvious external reason (highly
unusual)
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