TROUBLESHOOTING
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e) Mix Tube restricted causing excess backpressure. Change mix tube.
f) The most common cause is the A-SIDE chemical port of the Mix Cartridge is clogged. Close all ball
valves, disconnect A-SIDE wing, retract rod, and clear out hole with correct drill bit. Replace Mix Car-
tridge if needed.
g) Other restrictions on A-SIDE. Inspect wing, check valve and flow controller for clogs and debris.
Clean or replace as needed.
h) B-SIDE flow controllers are stuck in maximum flow position.
i) Disconnect A-SIDE stratoflex and ensure that grease is removed. Reconnect stratoflex ensuring
that it is fully engaged.
NOTE: Most of the corrective actions for the above problem have been covered in preceding sections and
should be reviewed.
Problem: Foam is crusty or exhibits surface friability. (System is off ratio. A-SIDE high in proportion to B-SIDE)
Probable causes:
1. Flow restricted on the B-SIDE line or cylinders.
2. Too much A-SIDE flow.
3. Poor Mix
Corrective actions:
1. B-SIDE restricted flow has many causes.
a) Ball valves closed on the B-SIDE. Check that all B-SIDE ball valves on gun and tanks are open.
b) Temperatures too cold on the B-SIDE. Bring chemicals up to correct operating temperatures after
reducing nitrogen pressure to 150 PSI.
c) Low pressure on the B-SIDE chemical cylinder. Adjust to correct operating pressure range.
d) High pressure on A-SIDE chemical cylinder. Adjust to correct operating pressure range.
e) Mix Tube restricted causing excess of backpressure.
f ) B-SIDE chemical port of Block is clogged. Close all ball valves, disconnect B-SIDE wing, retract rod,
and ream out hole with correct drill bit. Replace Block if needed.
g) Other restrictions on B-SIDE. Inspect wing, check valve and flow controller for clogs and debris.
Clean or replace as needed.
h) A-SIDE flow controllers are stuck in maximum flow position.
i) Ensure B-SIDE stratoflex is fully engaged.
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