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Old 05-02-2007, 09:36 PM   #1
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Why no accumulator?

Our new 20' Safari did not come equipped with an accumulator. There was plenty of room to add a ShurFlo accumulator right next to the ShurFlor water pump and the installation was quick and easy (just had to lengthen one piece of PEX tubing). Pump and water system works much better now. Any reason Airstream doesn't put them in at the outset? Roger S
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Old 05-02-2007, 10:09 PM   #2
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Old 05-02-2007, 10:40 PM   #3
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What is an accumulator and why do I want one?
Thanks,
KL
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Old 05-02-2007, 11:19 PM   #4
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$40 they do not have to spend. I put one in my classic. It took the hammer out of the systems and quieted it down significantly.
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Old 05-02-2007, 11:24 PM   #5
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Michelle,
How many pounds of pressure? Before I knew what an accumulator was, I pressed on the "valve stem" (only for a second!) so I don't know what the pressure should be. Help!
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Old 05-03-2007, 12:22 AM   #6
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Hey Roger S,
I'd like to put one on my 20' Safari, too! Happen to have a picture of your work?

I also found that putting foam pipe insulation around all the loops of PEX under the twin sinks made a huge difference in pump noise. But I definitely want to put in an accumulator. I feared it might interfere with the below-oven drawer...?

Cheers,
-jd.
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Old 05-03-2007, 07:13 AM   #7
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Try one of the new 'Extreme Series' variable speed water pumps and you won't neeed an accumulator at all. They are super quiet and give you domestic quality water pressure.

Not cheap at all, but they really do the job!
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Old 05-03-2007, 07:19 AM   #8
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Quote:
Originally Posted by silverback
What is an accumulator and why do I want one?
Thanks,
KL
I'm not sure, but since no one is anwsering ..... I believe it it a holding tank that is maintained under pressure.
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Old 05-03-2007, 07:27 AM   #9
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An accumulator is a small water tank, usually 1-2 gallons, that acts as a buffer between the demand (faucet) and the supply (water pump) in a water system. It relieves the water pump from constant on/off action when a faucet is opened for ocassional use, as it is pressurized.

It will generally stop water hammering in a system.

Hope this answers your question.
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Old 05-03-2007, 10:16 AM   #10
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I really can't tell you. I set the pressure and tried to check it. Then it was too low. It is somwhere around 50-60 PSI.
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Old 05-03-2007, 11:40 AM   #11
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The accumulator is a small sealed tank that is divided by a flexible rubber partition. One side of the partition has the sytem water going through it and the other side has air under pressure at 10psi. When the pump starts, the pressurized water compresses the air in the accumulator. When the pump stops the water is maintained under pressure by the air trapped in the dry side of the accumulator. This allows some water to be used without causing the pump to start every time and absorbs the hammering of the pump whiile it is pumping. To bias the accumulator, shut off the pump and open a faucet, then put 10 psi in the accumulator via the valve.
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Old 05-03-2007, 01:36 PM   #12
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Here is a shure flow intsruction sheet and URL:

Pressure System Accessories > Water Pressure Systems > Jabsco - ITT
Attached Thumbnails
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Name:	Accumulator.GIF
Views:	188
Size:	107.8 KB
ID:	36755  
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Old 05-06-2007, 12:56 AM   #13
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Thanks to Excella CM's link, I read up on, then found the Jabsco Model 30573-0000 accumulator tank (1 liter) at West Marine in town today. I chose this unit over the Shure-flo 0.65 liter model available at CW because it's nearly twice the capacity with the same diameter -- and I could get it immediately

I installed it this afternoon with no trouble. This accumulator came with both threaded and barbed 1/2" QEST fittings, compatible with the existing water pump. I connected the pump to the accumulator with a short (8-10") length of flexible 1/2" i.d. 200 PSI cold water hose and plugged the existing flex hose -- QEST fitting and all -- into the tank's exit port. I figured it's a good idea to maintain a flexible exit from the pump...

I used neoprene rubber washers to sandwich the tank's mounting flange as well, but I don't think that was absolutely necessary.

All is wonderfully quiet now

Some additional observations:
  1. The factory-installed pump's mounting screws were overly tightened, severely diminishing the effectiveness of the rubber mounting dampers. The installation manual clearly indicates these should be tightened to just-touching the rubber dampers to avoid compressing them.
  2. I wrapped virtually all of the many loops of PEX plumbing under the sinks, as the stiff material vibrated against the walls, sink, and other plumbing quite loudly (before adding the accumulator).
  3. This accumulator provides a lot more running water than I expected, before the pump kicks in again. I'm real impressed.

Karma to you Excella CM, for the link.

Cheers,
-jd.
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Old 05-08-2007, 03:05 PM   #14
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pics

Here are some post-install pics (click for larger):
Pump/accumulator under the oven
Click image for larger version

Name:	accumulator-1.jpg
Views:	376
Size:	157.5 KB
ID:	37095

Side view of accumulator tank
Click image for larger version

Name:	accumulator-side.jpg
Views:	202
Size:	134.3 KB
ID:	37096

Accumulator schrader valve is easy to access
Click image for larger version

Name:	accumulator-2.jpg
Views:	155
Size:	143.1 KB
ID:	37097

Cheers,
-jd.
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