replumb for more pressure

Since the OP started this thread on 1/05/14 and never returned to answer some pertinant questions, and some of the replies now are becoming personal in nature, I am going to close this thread. If the OP does return and decides he did not get a sufficient answer he can let me know and I will reopen it.
Barney

old guy wrote:
what or why? are you building a fire truck?

Old Guy, I love your sense of humor. Rotflmao.

I don't understand the question. If you are connected to a 70 psi supply, you will have 70 psi. If you are connected to a 50 psi supply, nothing you do other than a booster pump will give 70 psi.

If you are looking for better pressure for the shower, I suggest you invest in an Oxygenics shower head. It's patented design will give you a much better result than the traditional OEM shower heads.

In the US, residential bathroom faucets are limited to a maximum flow rate of 2.2 GPM at 60 PSI, and showerheads to 2.5 GPM at 80 PSI by law.

Hey OP........

WHY the need for higher pressure?

Answering that question will result in better ideas/suggestions

Why just 70 psi........here's a 12v DC water pump rated at 100 psi LINK

I personally wouldn't go over 55 psi but would upgrade for higher flow

Whats the reason?

Want more water in your shower?

Adding excessive water pressure is not going to help all that much.

You can only fit so much water through a straw (1/2" Pex Pipe).

My sticks and bricks I have 3/4" water lines through out, run 25 PSI- 38 PSI from a water well. Full blast my shower will pin you against the wall.

You simply are not going to have the same showers in a RV as a sticks and bricks and I for one would not want to test the strength of the plumbing parts in a RV with 70 PSI.

I think you will find a lot of unwanted water leaks in a hurry...

I installed all new PEX and the best ball type valves in my rig. I used all of the old faucets since they are all old time brass with rubber washer. I've had the system hooked up at 65 psi. for days with no problem. The Aqua Magic toilet valve is about the only suspect failure point.

what or why? are you building a fire truck?

PEX can handle a lot more than 70 psi - over 100 psi for sure.
Residential faucets and fixtures have an upper limit of 85 psi- don't know about RV faucets.
Winnebago tests their motor home plumbing systems at 85 psi.

Because of a malfunctioning Watts whole house regulator at the house we bought summer before last, our motor home saw 135 psi for three weeks with no problems.
I don't know how long the house saw the 135 psi - at least a year though.
I didn't test the pressure at the house because I saw the Watts regulator - also didn't connect the one I have for the motor home - same reason.

The new Watts house regulator is set at 65 psi as is the Watts regulator I use on the motor home when the pressure is over 65 psi.