Replacement Pump: Short inlet & Slip union?

[jeanpascalc]

Hello,
My Hayward Superpump has been loosing prime every morning in the past few days.
It's leaking water from the bottom so am guessing the housing is cracked or some gasket is bad but this is not primary question as I have a Calimar VSP waiting to be mounted so it's a good opportunity to swap.
I already have a union above the check valve so that part is easy to disassemble at least. I may even be able to re-use the check valve if the pipe has the right lengh and I can unscrew the pipe.
What about the grey inlet though?
After reading on this forum, I got slip unions I was planning to use for the installation of the new pump: https://www.amazon.com/gp/product/B003XK7UDO/
My plan is to cut the inlet pipe as close as possible from the pump then hope the dimensions work. Is this a good plan?
In the unfortunate event the pipe too short, is it ok to add a coupling before the slip union? Any concerns with such a setup?

Thanks for your help!

 

[HermanTX]

After reading on this forum, I got slip unions I was planning to use for the installation of the new pump: https://www.amazon.com/gp/product/B003XK7UDO/
My plan is to cut the inlet pipe as close as possible from the pump then hope the dimensions work. Is this a good plan?
In the unfortunate event the pipe too short, is it ok to add a coupling before the slip union? Any concerns with such a setup?

Overall good plan. Ensure the threaded part of the union matches to your pump thread. Will you put the other union on the pump outlet? You don’t need 2 unions on that pipe to the filter but it doesn’t hurt to have them.
Ok to use a coupling if needed for space out. They jammed you up between the filter and the electrical post on left.
You can push the new pump towards the back some if need to create a longer run on the inlet. This may require you to plump the pipe from the pump to the filter.

Ideally, if you are having trouble holding water in your pump or filter when not running, you could put the check valve on the suction side of the pump (this would hold water in both the pump and the filter) but you would need to move that electrical box to create more space to move the pump over to the left.

Also, welcome to TFP
Please read Pool Care Basics - Trouble Free Pool and also view the videos that provide more details on specific topics TFP-TV - Trouble Free Pool

 

[jeanpascalc]

Overall good plan. Ensure the threaded part of the union matches to your pump thread. Will you put the other union on the pump outlet? You don’t need 2 unions on that pipe to the filter but it doesn’t hurt to have them.
Ok to use a coupling if needed for space out. They jammed you up between the filter and the electrical post on left.
You can push the new pump towards the back some if need to create a longer run on the inlet. This may require you to plump the pipe from the pump to the filter.

Ideally, if you are having trouble holding water in your pump or filter when not running, you could put the check valve on the suction side of the pump (this would hold water in both the pump and the filter) but you would need to move that electrical box to create more space to move the pump over to the left.

Also, welcome to TFP
Please read Pool Care Basics - Trouble Free Pool and also view the videos that provide more details on specific topics TFP-TV - Trouble Free Pool

Thanks for your quick reply! I was going to put 2 unions since I have them but I agree it's a bit overkill.
The water used to stay in the pump until it started leaking, I should not have this issue with the new pump.
Pushing the pump back is a good idea, I need to see how this plays with the line to the filter.