20
SEA-3000 LW & 4500 Technical Manual
SYMPTOM
POSSIBLE CAUSE
TREATMENT
System will not remain depressurized after
handwheel is closed and second stage is
purged.
1. The seat disc & retainer (16) is worn or
damaged.
1. Replace seat disc & retainer (16).
2. The seat disc & retainer crown in HP module
body (13) is worn or damaged.
2. Replace HP module body (13).
High or Unstable MP “Creep”
1. HP valve (9) is dirty, worn or damaged.
1. Clean or replace HP valve (9).
2. HP valve crown in LP module body (8) is
worn or damaged.
2. Replace LP module body (8).
3. The seat disc & retainer crown in HP module
body (13) is worn or damaged.
3. Replace HP module body (13).
4. The o-ring (11) inside HP balance chamber
is worn or damaged.
4. Replace o-ring (11).
5. The HP balance chamber in HP module
body (13) is worn or damaged.
5. Replace HP module body (13).
Low MP
1. The MP spring (4) is weakened, damaged
or first stage is improperly adjusted.
1. Replace MP spring (4) or check MP
adjustment using test gauge.
External Air Leak
1. The diaphragm (6) is worn or damaged.
1. Replace diaphragm (6).
2. The diaphragm seating surface is worn or
damaged.
2. Replace LP module body (8).
3. The diaphragm clamp (3) is loose or not
torqued properly.
3. Torque diaphragm clamp (3) to proper
value.
4. O-ring (12) on HP module body (13) is worn
or damaged.
4. Replace o-ring (12).
5. The LP module body (8) is loose.
5. Tighten LP module body (8). Check
safety wire (36) has been installed.
6. Safety plug (35) not seated or torqued
correctly.
6. Check for damage and re-torque safety
plug (35).
Restricted Air Flow or High Inhalation
Resistance
1. Handwheel (26) not completely turned to
the "ON" position.
1. Turn handwheel (26) to the "ON"
position.
TABLE 1: TROUBLESHOOTING GUIDE FIRST STAGE
