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SSPB Pump Replacement and Large Tanks

March 28, 2018, 11:43:12 am Lein says: Anyone play MOBAs? Also are you at university Tech?
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Author Topic: SSPB Pump Replacement and Large Tanks  (Read 259 times)
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« on: April 05, 2012, 04:44:32 pm »

SSPB's need too many pumps to be really effective as a sidearm. Here's my go at a pump replacement. The factory pump is simply chopped off leaving an inlet for the new pump. I used a water gun pump from a Buzz-Bee Equalizer. It's about 1" in outer diameter and 6" long. A thinner pump would likely add pressure and perform better. A 45 degree PVC elbow is used to support the pump and act as a grip. I show 2 sizes of tank expansion. I think the smaller will be sufficient for most. I am trying a wye out on the larger with good results.

Here are most of the required parts. You will need some tubing to nest around the pumps outlet. I used the outlet pipe from a UMB pump. You may want some 1/2" thinwall PVC to move the grip back.

First let's chop up the SSPB. We'll use various methods to keep debris out of the guts. A bit of foam works well for the pump inlet. I used grease for the valve this time. A little electrical tape keeps dust out of the trigger. Twist the barrel peg out with needle nose pliers. Stuff a piece of crumpled up, wet paper towel tightly down the barrel to protect the valve from debris on this rough cut. Pull the pump handle all the way out. Chop your SSPB here.

Clean all the debris away and add some white lithium grease to the valve area. Try to get it behind the cross or remove the cross with a razor knife. This will keep debris out. I also removed a support boss at this point. It will get in the way of the grip later.

Chop a little more to get past the cross without hurting the valve. Scoop out the debris and grease with any small tool. I also used a q-tip to clean the valve out thoroughly. If done carefully there should be no need to flush the tank.

Chop a coupler in half, just behind the ridge.

I chamfered the area around the valve a little just for experimentation's sake. Glue on the coupler. While it's drying we can build and fit the tank.

Now onto the tank expansion. I used a PVC stub for the larger tank. I'm not sure if there is a real performance difference. It's a bit trickier to shape than a CPVC stub. Both tanks use a 1/2" PVC elbow. The larger tank uses a PVC endcap instead of a nested CPVC one. Nest a small length of PVC inbetween the elbow and the endcap for the larger.

Dremel the area under the PVC stub until it's paper thin.

Carefully slice out the center. Sorry about the recycled pic.

Afterwards I melted the edges a bit with a wood burning tool. This is optional. It's easy to see that support boss that needs to be removed in this pic.

Test fit the tank. I kept everything close to the SSPB so I could glue it in a few places for strength. Solvent weld the tank together and let it dry. I affixed the tank to the SSPB with super glue but epoxy or solvent welding is a good choice too.

Ok let's move on to the pump. I used a fairly slim pump but a slimmer one would raise the pressure in the tank a bit more. This pump needed the 90 degree bend chopped off to fit of course. This is still to small to nest into the SSPB's pump tube so we'll need a small section of tubing to make up the difference. The outlet tube from an old UMB pump is perfect.

Here it is chopped up and test fitted. I used the tape as a guide to line up the pump with a mold seam on the bottom of the SSPB. Solvent weld everything in. I added a filet of superglue to the join later for extra strength. Now we can fit the pump support/grip handle.

Here it is glued up. Add some glue to the elbow (or thinwall spacer) and pump face when assembling, to support the back of the pump well.

Chop 2 slots down the elbow. The length of the slots can be manipulated to change the grip dimensions. I just twisted the waste material with needle nose to remove it. I needed to dremel away some material from inside the elbow on the shorter grip. I also needed to add a (notched) 1/2" thinwall spacer to the longer grip. Later we can add a length of PVC and a 1/2" endcap to the grip. I used thinwall for weight. Glue the elbow both to the pump and to the SSPB for strength. I later added a slice of coupler to the face of the pump for reinforcement

Now let's make the pump work. I used a piece of 1/2" PVC (conduit) with a piece of CPVC whomped into it. Shave a portion of the PVC to fit inside your pump. The CPVC is whomped in and reamed out until the pump tube slides through it freely. I affixed this with electrical tape for easy maintenance. I added an additional piece of CPVC to the end of the pump to affix my elbow and pump handle.

Shot de Money.

After some tweaks. Note the additional slice of coupler to reinforce the pump.

The smaller expansion takes 4 pumps for 100' ranges. The larger works a homemade wye at the same ranges but takes 5-6 pumps.
« Last Edit: May 11, 2012, 04:55:07 am by iamthatcat » Report Spam   Logged

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« Reply #1 on: April 05, 2012, 09:20:56 pm »

You're going crazy with all these SSPB's! Seriously though, you could walk into a war with just a trench coat full of these, and win.
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Edit #3: I spelled the name wrong, so for about 10 minutes, our website logo was "Hoe of Foam".
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« Reply #2 on: April 05, 2012, 09:46:40 pm »

Heheh yeah. I tried these in the hammer pockets of a pair of carhardt jeans. I may just sport a pair of these at my first war!
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« Reply #3 on: April 06, 2012, 09:18:43 am »

Holy crap!!! Dude, you can use these things as a primary. I've got to try and make one. I just need another pump... Great job.
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« Reply #4 on: April 06, 2012, 10:23:36 am »

In truth the dart speed is a little low imo for use as a really effective primary. However if you can find or build a slimmer pump than I show, I think the added pressure would make it worthy. I have one put to the side to try and my best cherry-picked SSPB waiting!

Having said that the singled ranges and dart speed are amazing with a plugged pump and a few extra pumps. My second story neighbors accross the way can attest to that!
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