We are seeing more rigs come in that have multiple colors still inside the
fluid section. I know that these are latex paints, “water based material”, but
water alone will not clean the pump. Any material that is darker than an
off-white will still leave a residue of color in the pump. This layer will then
collect the next material (even off-whites) from then on. This causes wear and
tearing of the packings, which can also cause piston and cylinder wear and
damage.
The cure for this is to use liquid dishwashing soap in the second wash. The
first wash is just water, clearing out the bulk of the material. Recirculate
the second wash for 5 minutes. Let the pump build pressure occasionally during
this time. Then make sure that you completely rinse the soapy water out of the
pump with the third wash. If there is any clouding in the rinse water, repeat
the second wash.
There are some really deep tint colors that will require paint thinner to
dissolve all of the colorant, but that is another article.
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