Return pump redundancy

[Tigé21v]

Trying to get all my tanks' circulation divided between different circuits. I'm wondering if I have two return pumps, feeding the same line, will this will work? I figure if I install check valves on each pump line before they join the main run, if one circuit trips, the other pump will continue to feed the tanks albeit at a slower rate? I know that check valves are notorious for leaking if not maintained, but honestly in this application a full seal won't be needed.
I guess my main question is whether or not the two pumps will be working against each other, and if so, how much will it affect their performance? Also, I'm guessing the pumps should be the same size?
TIA

 

[Indymann99]

I keep a "spare" return pump as my "mix tank" pump.

works great and I always have a spare (mag 9.5)

I tried to work out a 2x return pump system but not worth the extra complication, plumbing, heat, and energy usage.

 

[Tigé21v]

My goal is minimal effects on the system if I should have a circuit trip. If I'm not home, no one else in the house would probably realize something was wrong (unless the tanks' lights were off). I have four dedicated circuits for the system, it seems like a no-brainer not to take advantage of it.
The heat is not an issue, the tanks are in the basement. A few bucks in plumbing, and a couple of extra watts a month seem like a steal if it can avert a possible crash.

 

[tkeracer619]

Run separate returns, one for each pump. Do not rely on check valves.

 

[ca1ore]

Agree to run two separate lines. Check valves put resistance onto the pump.

 

[Tigé21v]

Agree to run two separate lines. Check valves put resistance onto the pump.

Maybe some resistance....

 

[tkeracer619]

I've seen the cheap molded plastic split when slamming closed causing massive flood, but beyond that they simply don't work well in a saltwater environment.

 

[ca1ore]

When I bought my first reef-ready tank in 1990 I tried all sorts of check valves - Y-style, flappers, floats - they were all useless. Ended up in my plumbing parts drawer. But, If you're hell bent on using one, by all means proceed

 

[Spaced Cowboy]

If you look at the plumbing in my build thread (http://reefcentral.com/forums/showthread.php?t=2454671), you'll see how I'm intending to do it. Two pumps, only one active at a time, ball valves for a fast change-over from one to t'other in the event of failure or cleaning, and I have the luxury of time to repair/re-order/clean the one just switched out.

Simon