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Cleaning plugged lines in bottom of 2301 tanks


Bluemooncamera
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Anybody have any good suggestions for cleaning out the lines coming out of the bottom of the tanks? Specifically, when we inherited this 2301 the first stabilizer tank and bleach tanks both have a clogged line. It is thankfully not the four outlets in each corner that route to the pumps, but rather the slightly larger tube near the center of the tank that connects between the bottom of the filter pod and pump. They appear to be plugged with a black carbon-like gunk. Too small and too many sharp turns to get a snake in to rout them out, is the best but to cut the lines out and replace them at this point?

Second question, we are seeing really strong circulation in the tanks in both developer and the last stabilizer, there is a small amount of circulation in the bleach but not nearly as strong and no apparent circulation in the 1-3rd stabilizers. Is this natural or should all tanks be showing strong turbulence?

Thanks in advance.

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First question.. Bit of a tricky one, but if they are that clogged up, you may need to snip and replace. You do not have your country in your profile, but here in the UK we have problems with different types of "water" Epson Salts can help if you have <hard> water

Second Q .... You may have a clogged filter? or some debris in your bleach tank? have you done a drain, a wash and a flush?

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Thanks for the reply Neil.  Yeah, we had pretty much reached that same conclusion, though we were hoping someone had a miracle cure for clearing these lines out.  We are in the US, by the way, so the idea of epson salts is an interesting one.

In terms of the second question, we are running these tanks without filters currently in.  We just acquired this machine, it was apparently running fairly well with some unindentified bleach circulation problem.  The line out of the pump that feeds into each of the nozzels in the four corners of the tank seems to be clear, although the solo line out the bottom of the tank appears to be clogged like the first stabilizer.  We have done multiple fills and flushes to each tank, so perhaps at this point the pump itself it going belly up.  I just wanted to make sure that we were not already seeing the regular amount of circulation, because there is some, just not nearly as turbulent as the developer and last stabilizer tanks where the liquid is really churning.  The bleach tank definitely has a current stirring things up, just not violently so.  Does this sound normal?

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We just acquired this machine

Sorry about this but <<<ALARM BELLS>>>

OK, so  new bit of kit? Right, stop, and think... First, a total drain, empty, wash, clean, wash again, and clean again. A fill with just fresh water, to see what is what etc.. then proceed \Take your time, and then progress

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That is pretty much how we are going.  We have actually spent the better part of two weeks filling and flushing, cleaning racks and making sure everything is as clean as possible prior to our first mixing.  The machine was essentially free and it was the machine we wanted due to the large paper size and optical printing.  So far we have been pretty successful, we have ran paper through the machine filled with water.  Just trying to fix these circulation issues before we are dealing with a machine full of chemistry.  

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I'm presuming this is an SM machine from your description.

The most likely place for dirt to get into is the input side (top) of the pump.

Empty any liquid from the tank and remove the pump, take the top off the pump by removing the screws, check that the impeller spins freely, sometimes the ceramic shaft can get coated in silver (unlikely in the BF!) and cause the impeller to not spin freely, reducing the circulation accordingly, check the input pipe on the pump is not full of debris.

You may want to back flush the pipe work by partly filling the tank, and draining from the pump output pipe. Put a hose pipe on the pump input pipe and back flush into the sub tank. Check the pipe from the sub tank to the pump is not squashed at any point causing a reduction in the flow, if it is you may be able to straighten it out by heating the pipe with a hair-dryer (assuming it is a flexible type pipe) it's such a long time since I've worked on a 2301SM I can't exactly remember how the pipe work is configured.

The BF circulation should be similar to the CD.

All the STB tanks should have a similar amount of circulation.

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I seem to remember that the CD and BL pumps are two speed(?).  With no work they idle, and when the processor is running (work) they ramp up to full revs. This may be why you are observing a visible difference in the agitation.

Not related, but with the QSS27xx series, same processor as the QSS2301, we used to experience problems caused by the inrush when the pump kicks in causing a solution level error messages. When you remove the filters this effect is very obvious.

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