ACQUITY UPLC BSM dynamic leak test failure - WKB19234

SYMPTOMS

• Dynamic leak test fails to pressurize or compress
  • When compression occurs, the accumulator actuator suffers very high leaks and the test fails to complete
• Pump heads rebuilt with pump head/seal wash housings, check valves, plunger, and seals
• New vent valve
• Pressurize the system >10,000 psi with flow results in stability and delta <20 psi using any combination of mobile phase
  •  Retention times are consistent and pressure holding stable during overnight runs; sensitivity good

ENVIRONMENT

• ACQUITY UPLC Binary Solvent Manager (BSM)
• ACQUITY UPLC H-Class Quaternary Solvent Manager (QSM)
• ACQUITY UPLC I-Class BSM

CAUSE

Tubing and fittings leak.

Over time, service to pump head components during performance maintenance can contribute to a high leak rate and dynamic leak test failure.

FIX or WORKAROUND

1. Replace the following tubing assemblies to manage suspected leaks at high-pressure fittings:
   • Common pump head tubing and plumbing:
     • 430001120 for the ASSY, TUBE, HEAD OUTLET TO XDUCER INLET
     • 430001121 for the ASSY, TUBE, XDUCER OUTLET TO ACCUM CV INLET
   • Pump A accumulator to vent valve
     • 430001200 for the ASSY, TUBE, ACCUM "A" XDUCER - VENT VALVE (Port 3)
   • Pump B accumulator to vent valve
     • 430001199 for the ASSY, TUBE, ACCUM "B" XDUCER - VENT VALVE (Port 6)

ADDITIONAL INFORMATION

• If tubing is suspect, you may need to replace the following tubing assemblies:
  • Pump A: 430001208 for the ASSY, TUBE, VENT VALVE PORT 2 TO TEE/FILTER
  • Pump B: 430001207 for the ASSY, TUBE, VENT VALVE PORT 5 TO TEE/FILTER
  • Pump outlet tubing: 430001486 for the TUBE ASSY, PUMP OUT, .010" FOR EVERFLOW INJ
• Loosely tightened/worn support plate can also cause excessive leak, part number: 700002601