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What This Guide Helps With
A pipeline supply alarm occurs because of disconnected hoses, unavailable wall supply, damaged connectors, crossed connections, infrastructure problems, or machine-side pressure sensing.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Required Gas Supply
If a pipeline gas alarm occurs during patient care, ensure required oxygen, ventilation, and anesthesia delivery remain available using an appropriate verified alternative or backup supply according to facility procedure. Do not troubleshoot a questionable supply connection while the patient depends on it. Expected outcome: Patient support continues safely independent of the suspected pipeline problem.
2. Identify the Affected Gas
Record whether the alarm involves air, oxygen, nitrous oxide, or more than one supply. Note whether the alarm began after moving the machine, changing rooms, reconnecting hoses, or switching supplies. Expected outcome: The affected gas and circumstances are clearly identified, helping distinguish a local hose problem from a broader infrastructure condition.
3. Inspect the Machine-Side Pipeline Connection
Confirm the affected hose is fully connected to the correct inlet on the Atlan A350. Inspect the connector and visible hose for damage, looseness, kinking, or strain. Expected outcome: The hose is correctly and securely connected to the machine. If reseating it clears the alarm and supply remains stable, continue with final verification.
4. Inspect the Facility Outlet Connection
Verify the other end of the hose is fully connected to the correct pipeline outlet. Check for an obviously loose or damaged connection. Do not modify facility gas outlets. Expected outcome: The machine is connected to the correct facility gas source. If correcting the outlet connection resolves the alarm, verify stability before return to service.
5. Rule Out a Hose or Connector Problem
When appropriate, substitute a known-good approved pipeline hose or test the suspect hose on another verified setup according to facility practice. Avoid cross-connecting gases during comparison testing. Expected outcome: The hose is either confirmed functional or identified as the cause. If replacing a defective hose clears the alarm, complete system testing.
6. Determine Whether the Problem Follows the Room or the Machine
When facility workflow permits, compare the affected gas source using another known-good machine or move the Atlan A350 to a verified pipeline outlet. Coordinate suspected infrastructure problems with Facilities or the responsible medical-gas service group. Expected outcome: The problem is isolated to the room supply, external hose, or anesthesia machine. If the alarm follows the wall outlet, remove that outlet from clinical reliance and escalate the infrastructure issue.
7. Check Backup Supply Availability
If cylinders are installed for backup use, verify their condition and availability according to hospital and manufacturer procedures. Do not allow successful backup operation to obscure an unresolved pipeline problem. Expected outcome: Appropriate backup gas is available when required, while the original pipeline fault remains clearly documented and investigated.
8. Repeat the Machine System Test
After correcting any external supply issue, reconnect the machine normally and repeat the applicable system test. Expected outcome: The pipeline supply is recognized without alarm and the system test completes successfully.
9. Verify Stable Operation
Observe supply status during controlled ventilation and gas-delivery testing. Verify alarms clear appropriately and do not recur with normal machine movement or hose positioning. Expected outcome: Gas supply remains stable and all required functional checks pass. Troubleshooting can stop.
10. Escalate Machine-Side or Infrastructure Faults
If the alarm remains with a known-good hose and verified pipeline source, remove the machine from service. If the fault is isolated to the facility outlet or pipeline, clearly identify the infrastructure problem and prevent clinical reliance on the affected source until repaired. Expected outcome: The unresolved equipment or infrastructure fault is appropriately isolated and escalated.
If the Problem Persists
External hoses, machine and wall connections, known-good substitutions, and facility supply comparisons have been completed. Remaining causes may involve an internal gas inlet, pressure regulator, pressure sensor, pneumatic pathway, electronics, or an unresolved medical-gas infrastructure problem. If the fault follows the machine, the device should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate manufacturer documentation and approved test equipment
- Repaired or configured only by qualified personnel
If the fault follows the building supply, coordinate repair with the appropriate Facilities or medical-gas service personnel and keep the affected outlet unavailable for clinical use until verified. Following repair, repeat all applicable gas-supply, system, ventilation, alarm, and return-to-service testing. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
A gas supply alarm may originate from the building rather than the anesthesia machine, so verify the entire supply path before replacing equipment.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Anesthesia staff reported the Drager Atlan A350 displayed an oxygen pipeline supply alarm after the machine was moved into an OR."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the oxygen hose connector was not fully engaged at the wall outlet."
Resolution
What action was taken.
Example:
"Clinical Engineering properly connected the oxygen hose, verified stable pipeline supply, completed the system test, and confirmed normal gas delivery before return to service."
Helpful Details to Include (If Known)
- Gas named by alarm
- Exact displayed message
- Machine-side connection
- Wall-outlet connection
- Hose condition
- Known-good hose result
- Alternate outlet result
- Backup supply condition
- Whether another machine showed the same problem
- Facilities involvement
- Final system-test result
- Final device status
- Gas named by alarm
- Exact displayed message
- Machine-side connection
- Wall-outlet connection
- Hose condition
- Known-good hose result
- Alternate outlet result
- Backup supply condition
- Whether another machine showed the same problem
- Facilities involvement
- Final system-test result
- Final device status
Final Thought
Treat medical-gas alarms as potential patient-safety and infrastructure issues. Verify the entire external supply path systematically, isolate whether the fault follows the source or machine, and escalate appropriately. That is successful troubleshooting.