OM131
77
P1939-OM-131 R11
Chapter 4
4.4 F
AULT
DIAGNOSIS
A schedule of possible faults and remedies for various conditions of reduced performance of the
Backpack is shown in
Table 4.1 to aid fault diagnosis.
Table 4.1 Fault finding
Fault
Probable Cause
Solution
External gas leak from
scrubber door.
Main O-ring cut or torn.
Replace main O-ring seal on
scrubber door.
Scrubber door damaged.
Replace scrubber door.
(See Section 4.5.1)
Internal gas leak from
scrubber canister.
Sealing gasket cut or torn.
Replace gasket.
Scrubber lift mechanism not
providing sufficient sealing.
Replace scrubber lift
mechanism.
External gas leak from upper
part of main housing.
Leak from one of the upper
penetrators.
Replace upper penetrator o-
rings.
(See Section 4.5.2)
External gas leak from lower
part of main housing.
Leak from one of the lower
penetrators.
Replace lower penetrator o-
rings.
(See Section 4.5.3)
External air leak from charging
point.
Check valve seat cut or
damaged.
Replace charging point check
valve seat.
(See Section 4.5.4)
External leak from burst disc.
Burst disc ruptured.
Replace burst disc.
(See Section 4.5.5)
Failure to pass flow test.
Restriction in injection orifice.
Ultrasonically clean injection
orifice and retest.
External gas leak from
demand regulator.
Sealing O-ring cut or torn.
Replace O-ring.
(See Section 4.5.6)
Damaged Diaphragm.
Replace Diaphragm.
(See Section 4.5.6)
Leaking Relief Valve
Replace Relief Valve.
(See Section 4.5.6)
Demand regulator body
damaged.
Replace regulator body.
(See Section 4.5.6)
Harness damaged.
Various.
Replace harness.
(See Section 4.5.7)
External air leak from
counterlung.
Counterlung cut or torn.
Replace counterlung.
(See Section 4.5.8)
Overpressure indicator not
operating.
Various.
Return to Divex Ltd for repair.
Summary of Contents for Divex SLS Mk IV
Page 2: ...Intentionally Blank...
Page 4: ...ii OM131 Approval Sheet P1939 OM 131 R11 Intentionally Blank...
Page 6: ...iv OM131 Preface P1939 OM 131 R11 Intentionally Blank...
Page 8: ...vi OM131 List of Abbreviations P1939 OM 131 R11 Intentionally Blank...
Page 10: ...viii OM131 Warnings P1939 OM 131 R11 Intentionally Blank...
Page 12: ...x OM131 Table of Contents P1939 OM 131 R11 Intentionally Blank...
Page 15: ...OM131 3 P1939 OM 131 R11 Chapter 1 Fig 1 1 SLS System Mk IV...
Page 16: ...4 OM131 Chapter 1 P1939 OM 131 R11 Fig 1 2 SLS system layout...
Page 32: ...20 OM131 Chapter 2 P1939 OM 131 R11 Fig 2 4 Two stage regulator Fig 2 5 Spool valve...
Page 42: ...30 OM131 Chapter 2 P1939 OM 131 R11 Intentionally Blank...
Page 53: ...OM131 41 P1939 OM 131 R11 Chapter 3 Fig 3 3 Hose Lanyards...
Page 54: ...42 OM131 Chapter 3 P1939 OM 131 R11 Fig 3 4 SLS System Mk IV Rear View...
Page 55: ...OM131 43 P1939 OM 131 R11 Chapter 3 Fig 3 5 SLS System Mk IV Front View...
Page 64: ...52 OM131 Chapter 3 P1939 OM 131 R11 Intentionally Blank...
Page 82: ...70 OM131 Chapter 4 P1939 OM 131 R11 Fig 4 7 Annual Maintenance Two Stage Regulator...
Page 86: ...74 OM131 Chapter 4 P1939 OM 131 R11 Fig 4 8 Annual Maintenance Single Stage Regulator...
Page 109: ...OM131 97 P1939 OM 131 R11 Chapter 5 Fig 5 2 Backpack Assembly Drawing P1939229S1...
Page 111: ...OM131 99 P1939 OM 131 R11 Chapter 5 Fig 5 4 Scrubber Housing Assembly Drawing P1939131S1...
Page 118: ...106 OM131 Chapter 5 P1939 OM 131 R11 Fig 5 9 SLS System Mk IV Gas Schematic Drawing P193940S1...
Page 123: ...OM131 111 P1939 OM 131 R11 Chapter 5 Fig 5 14 SLS System Mk IV Bottle Assembly...