• Object ID: 00000018WIA3088B950GYZ
  • Topic ID: id_2026055 Version: 2.0
  • Date: Feb 22, 2021 1:44:41 AM

Checking the hose and valve connection

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

Procedure

  1. Ensure the hose connections are secure from the HEC to the PGR cabinet, and from the HEC to the gradient coil.
  2. Verify ball (shutoff) and check valve connections to ensure they are tightened properly. (If either can be hand tightened, they are too loose.)
  3. Inspect the orientation of the check valves in the blue, black, green, and red hoses.

    Orientation should be per the schematic in Figure 1. The check valves in the supply hoses to the PGR cabinet (green) and the gradient coil (blue) should have the flow arrow pointing away from the HEC. The check valves in the return hoses from the PGR cabinet (red) and the gradient coil (black) should have the flow arrow pointing towards the HEC.

    If any valve is reversed, do not proceed with the procedure until the check valve is properly installed.

    Figure 1. HEC Coolant Schematic

    To view a high-resolution image of this schematic, , available from the online documentation library.

  4. Make sure the Teflon tape is applied properly to all male fittings as shown in Figure 3.
  5. If there is an issue with any of the connections, retighten or reapply new Teflon tape as needed before adding any coolant to the system.
    1. To apply new Teflon tape, start one thread in from the end of the male NPT fitting. Doing so will prevent tape from entering the fluid passage.
      Figure 2. Applying New Teflon Tape
    2. Because Teflon tape is not adhesive-backed, hold the end of the tape with a finger until one full wrap is completed. Wind the tape in a clockwise direction (as viewed from the end of the fitting). This ensures that the installation of the mating components results in wrapping the tape in the same direction and not unraveling or unwinding it.
      Figure 3. Correct Application of Teflon Tape
    3. After the first wrap, continue wrapping in a clockwise direction with moderate tension applied to the tape roll. Overlap the prior layer by a half width of the tape as shown in Figure 4. This ensures that two layers of tape cover all threads of the fitting.
      Figure 4. Teflon Tape Overlap

Finalization