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Created on 04.02
Why PAM Isn't Settling: 10 Troubleshooting Checkpoints (part 2)
Checkpoint 3: Incomplete hydration is the #1 silent failure (fix mixing order and time)
Dry PAM and many emulsions form “fish-eyes” (gelled clumps) if added too fast or into the wrong turbulence zone. The polymer trapped inside never dissolves, so your effective dose can drop dramatically.
Practical hydration tips
· Add polymer to water, not water to polymer.
· Use a vortex, but avoid violent cavitation (see shear checkpoint).
· Allow adequate aging after wetting: many high-MW products need 30–60 minutes to reach full viscosity and performance; some need longer depending on temperature.
Field clue: if the solution has visible “stringy” gel bits, uneven viscosity, or plugs strainers/injectors, assume incomplete hydration and correct preparation process first.
Checkpoint 4: Shear destroys long-chain PAM (and it looks like “no effect”)
PAM works largely because long chains bridge particles. Excessive shear (high-speed pumps, tight clearances, needle valves, static mixers at high ΔP) can cut chains and collapse performance.
High-risk shear points to audit
· Centrifugal pumps on neat polymer solution (especially small impellers at high RPM).
· Recirculation loops used “to keep it mixed.”
· Injecting through small orifices, needle valves, spray nozzles, or clogged check valves.
Quick diagnostic: if your fresh solution is noticeably more viscous than the solution after pumping, shear degradation is likely.
Checkpoint 5: Wrong make-down concentration causes clumping or poor feed control
If the polymer solution is too concentrated, it hydrates unevenly and becomes hard to meter. Too dilute, and your feed pump may not deliver stable dose at low flow, and you may over-shear it to “move enough volume.”
Typical symptoms that point to make-down concentration being too high or too low:
A.What you observe: Gel “fish-eyes,” strings, or unmixed clumps
Likely issue: Too concentrated or too fast addition
What to do: Lower concentration, slow feed-in, improve wetting
B. What you observe: Dose “hunts” or is unstable at low flow
Likely issue: Too dilute for pump control range
What to do: Increase concentration slightly or use better metering
C. What you observe: Viscosity collapses after transfer/pumping
Likely issue: Shear damage amplified by high viscosity
What to do: Reduce shear points; consider lower concentration
Rule of thumb: the “best” make-down concentration is the lowest that still gives stable metering and reasonable storage volume, without forcing aggressive pumping.
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