Friday, April 02, 2010

Priming The Pump

In yesterday's post I wrote about monkeying around with our cast-iron water pump.


In a comment, Donna from the terrific blog Irresistible Ideas For Play Based Learning, mentioned that their school was contemplating the acquisition of one of these simple water moving machines, but was concerned about my casual reference to having to regularly take it apart and put it back together. Knowing how to do this, or having someone readily at hand who knows how to do this, is essential to owning one.

I inherited parts of this pump when I took on my current position at Woodland Park. I found it behind a bunch of junk in storage closet, apparently having not been used for several years. I'd never been personally involved with a preschool that had its own water pump, but I'd heard such items discussed among my fellow teachers with great enthusiasm and even reverence. It came already attached to that wooden platform you see in the picture, with its 18-inch intake pipe emerging from the bottom. At the time, we only had one vessel deep enough to accommodate the pipe, a muck bucket like the one pictured below.


It was a perfect fit, telling me that it had been made specifically to fit over such a water supply. I filled the bucket with water, but no matter how hard I pumped, I couldn't get it to draw water. Now, I understood in theory how a pump worked, but my hands-on experience was zilch. The thing wasn't working. Could I really make it worse by taking it apart to see if I could figure out what was wrong?

A quick investigation found that there were only 3 bolts holding the whole thing together, two at the base and one at the top. I started by loosening the one at the top with a wrench and after a few turns the entire lever apparatus came off, attached to the "piston" part. I could see right away what was wrong. I knew that for the piston to create suction, it would need to fit tightly into the cylinder and this one didn't. There was a cup-like fitting (which I was later to learn was made of leather) on the piston that was shriveled and cracked. I could remove it easily by unscrewing the piston from the rod. A little internet research told me that there are, in fact, two "leathers" required to create the seals needed for suction. The second leather was a ring that fit around the base, which I would have discovered if I'd removed the other two bolts.

There are standardized sizes of these leathers and after a little investigation I figured out the size I needed and located an online supplier. Installing the new leathers was a piece of cake. Anyone who can remove and replace a bolt can do it.

Excitedly, I got the newly be-leathered pump ready for its trial run, but again was foiled. It still didn't draw properly and the handle was very, very hard to pump. I left it outside in frustration and went home for the night. Luckily, it rained. The next morning, I tried the handle again. This time it moved easily and after a few pumps began to draw water! The leathers apparently needed to be wet in order to function properly. I've since learned that this is what is meant by the expression "priming the pump." Now, whenever the pump has set idle for a few days without rain, we know to prime the pump by pouring a little water into the cylinder while pumping to get everything re-moistened.

For years, we had fun using our pump as an occasional and temporary installation, usually setting it up near the garden and employing house gutters to create a "raceway" in which the water can flow, but we wanted a permanent water source with our playground redesign, hence all the fiddling around with it over the past month.

If you don't have a pump, I highly recommend one as an addition to your outdoor play area, at least as an occasional, temporary installation. I'll let you know in an other month or so if they're worth the effort on a "permanent" basis.

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7 comments:

Sherry and Donna said...

Okay! So Sherry and I have seen a water pump, just like yours (I think) and now we really, really want one for our Hush Garden. SO ... next week my plan is to go back and sweet talk the garden man into letting me take a peek inside the pump to see if I can handle the repairs ... sweet. He'll let me do that right? ... hmm ... Then again maybe I should enquire about the price before I start pulling his merchandise apart ... We didn't think about how much this brilliant idea might cost us! Oh well, fingers crossed our pump dream doesn't turn into a pipe dream!
Thanks for posting this Tom,
Donna :) :)

jenny said...

Tom, I bet they never taught you this at uni :)

I'm really enjoying reading how you are tweaking your outdoor space and overcoming the little obstacles.

It makes us readers feel like we are a part of the whole process.

I dream of a pump. But first I dream of a water tank. And after reading Sherry and Donna's plans I'm dreaming of a dry creek bed. And a tinkering station. And a greenhouse. So many dreams :)

Life with Kaishon said...

That looks like a wonderful addition to your outdoor classroom. So glad you have had it for many years.

Jen Widrig said...

I love having an old-fashioned working "machine" in school. Too many kids don't appreciate or even recognize simple tools like this anymore.

Lindsey G. said...

I love your blog! Do you know the make and model of your pump? I want to make sure to get one that will last under toddler use, and be able to be operated by preschoolers/toddlers! Thanks!

Jan H said...

A pump - What a great find!
Shared this with my farm-boy husband and he said,"Oh Yeah..." and then proceeded to say that a large can of water was always left by the pump when you were finished, for the next priming of the pump.

femme magazine said...

waw ... great ideas .. love it thank you

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