Before you use this tool

QuenchIQ is a free indicative sizing aid from TradieRoles, provided by FTC Group Pty Ltd. It does not replace the magnet manufacturer's data or a qualified engineer's design.

The magnet manufacturer's peak quench flow and maximum allowable back-pressure are the governing inputs. Always use their figures.
Quench venting is life-safety critical (asphyxiation, cold burns, over-pressure). Final design and sign-off must be by a competent engineer to IEC 60601-2-33 and the manufacturer's requirements.
Results are indicative estimates only. FTC Group accepts no liability for their use.

I understand this is an indicative aid and I am responsible for the design.

QuenchIQ

MRI helium quench pipe sizing · indicative design aid · verify with magnet manufacturer

Indicative only. This estimates helium release, peak quench flow and pipe pressure drop from first principles. Near the magnet the vented gas is extremely cold and dense; it warms and expands along the run. The magnet manufacturer specifies the peak flow and the maximum back-pressure the turret can tolerate. Size the pipe to stay under that limit and have the design signed off by a qualified engineer.

1Helium release

Liquid helium volume in magnet

Liquid-to-gas expansion ratio

@ ambient

2Peak quench flow

Quench duration (boil-off)

Peak factor (avg → peak)

Override: manufacturer peak mass flow

kg/s

Gas temperature at flow condition

3Pipe & back-pressure check

Candidate internal diameter

Straight pipe length

Number of 90° long-radius bends

no.

Friction factor (SS, turbulent)

Max allowable back-pressure (mfr)

kPa

Liquid helium density (fixed)

kg/m³

4Results

Gaseous helium released

–

Helium mass

–

Average mass flow

–

Peak mass flow

–

Gas density @ temp

–

Velocity at candidate ø

–

Indicative pressure drop

–

Suggested min. diameter

–

Enter valuesIndicative back-pressure check will appear here.

Free indicative tool · QuenchIQ · TradieRoles Tools · © FTC Group Pty Ltd (ABN 70 694 989 994). Estimates use ambient helium expansion, ideal-gas density at the entered temperature and a Darcy–Weisbach pressure drop with bend K-factors (K=0.3 per long-radius 90°). These are indicative only and ignore compressibility, phase and thermal effects. Governing peak flow and maximum back-pressure must come from the magnet manufacturer. Final design and sign-off by a qualified engineer to IEC 60601-2-33.

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