• Discovery MR750 3.0T System Service Methods
  • 5690009-2EN Revision 4
  • Object ID: 00000018WIA30C8B950GYZ
  • Topic ID: id_2026059 Version: 1.1
  • Date: May 5, 2020 4:00:10 PM

Draining guidelines for hoses external to HEC

Prerequisites

Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
Tools and test equipment
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Consumables
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Replacement parts
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Required conditions
Safety

Before working in any GE Healthcare MR suite or performing any GE Healthcare service procedure, you must:

  • Have read and understood all hazard conditions and safety requirements in the latest revision of the GE Healthcare MR Service Safety Manual (5452735).
  • Have successfully completed all relevant GE Healthcare Environmental Health and Safety (EHS) courses (or for non-GE employees, equivalent workplace training courses).
  • Comply with all site-specific training and workplace safety requirements.

If you have any safety concerns at any time, do not begin work or immediately stop work and move to a safe location. Immediately contact your supervisor or site safety officer for instructions on how to proceed.

About this task

Perform LOTO on the HEC. See the MR Service Safety Manual, PN 5452735.

Procedure

  1. When troubleshooting a leak at the PGR or gradient coil lines with check valves (5270346):
    1. Isolate PGR or gradient coil lines by shutting off both the supply and return 1 inch ball valves (P/N 5273122). Locations are shown in Figure 1. The maximum volume can be calculated with the following equation:
      Maximum volume of fluid in 1 inch hose = (0.507 x L) liters, where L = length of hose in meters and 1 gallon = 3.78 liters.
    2. Lift the hose with the check valve to drain as much fluid as possible back into the HEC.
    3. Unthread the leaking side of the check valve from the fitting, and drain the fluid into the pail.
  2. When troubleshooting a leak at the PGR or gradient coil lines with ball valves (5272392):
    1. Isolate PGR or Gradient Coil lines by shutting off both the supply and return ball valves (P/N 5273122). Refer to Figure 1 for the ball valve locations.
    2. Kink the appropriate hose to isolate the fluid. If kinking is not enough to hold the volume of fluid between the ball valve and the source, drain into a pail or the gradient coil.
    3. Use a pail to drain the fluid between the check and ball valves. The maximum volume can be calculated with the following equation:
      Maximum volume of fluid in 1 inch hose = (0.507 x L) liters, where L = length of hose in meters and 1 gallon = 3.78 liters.
    4. Lift the hose with the ball valve to drain as much fluid as possible.
    5. Unthread the leaking side of the ball valve from the fitting.
  3. When troubleshooting a leak at the cryogen compressor lines with ball valves (5272392):
    1. Isolate the cryogen compressor lines by shutting off both the facility supply and return 1/2 inch ball valves contained within the HEC.
    2. Kink the appropriate hose to isolate the fluid. If kinking is not enough to hold the volume of fluid between the ball valve and the source, use a pail to drain the fluid. The maximum volume can be calculated with the following equation:
      Maximum volume of fluid in 0.5 inch hose (cryogen compressor) = (0.12272 x L) liters, where L = length of hose in meters and 1 gallon = 3.78 liters.
    3. Lift the hose with the ball valve to drain as much fluid as possible.
    4. Unthread the leaking side of the ball valve from the fitting.