Need help calculating/understanding head loss

[toyopl]

Shopping for new pump, and I'm a bit confused at head loss, and how to calculate it.
I'm lost on the fact if it's intake water only to pump you calculate, or also output length from pump to pool

13.5k above ground pool.
Skimmer Basket ---> 5ft pipe ---> Pump ---> 4ft pipe ---> Filter ---> 50ft pipe ---> Gas Heater ---> 50ft pipe ---> Pool

 

[Texas Splash]

Mr. @mas985 can speak that lingo for you.

 

[mas985]

Calculating head loss requires very detailed knowledge of the pool plumbing, even underground. You can measure the head loss with pressure gauges and vacuum gauges, or you can get a rough estimate with filter pressure and rough description of the suction side plumbing.

However, you really don't need to determine head loss to determine pump size. Get a VS pump and you are good to go. It is variable so will work with any pool. If you want a two speed pump, get the smallest two speed you can find unless it is running a spa, waterfall or other water feature but then you would better off with a VS pump. Don't waste your money on a single speed pump.

But if you still want to determine head loss, I do have some tools in my signature that can help.

 

[toyopl]

Calculating head loss requires very detailed knowledge of the pool plumbing, even underground. You can measure the head loss with pressure gauges and vacuum gauges, or you can get a rough estimate with filter pressure and rough description of the suction side plumbing.

However, you really don't need to determine head loss to determine pump size. Get a VS pump and you are good to go. It is variable so will work with any pool. If you want a two speed pump, get the smallest two speed you can find unless it is running a spa, waterfall or other water feature but then you would better off with a VS pump. Don't waste your money on a single speed pump.

But if you still want to determine head loss, I do have some tools in my signature that can help.

Thank you, I guess once I have the pump in hand, as there is just waaaay to many choices, I will figure out next step, head loss and what % to run specific pump at.
Thanks again for the help.

 

[mas985]

Again, you don't need head loss to determine rpm. In fact, head loss is dependent on the square of rpm.