Deck Wash-Livewell Combined System

Hello Everyone,
I want to install this system on small fishing boat. (Also dont want to drill underwater area)
For cleaning the fish blood from deck(Required high pressure) and feeding liwevell from 1 pump with 3way valve.

Pump will be self prime for the dry start. I found this one however Im not sure is it suitable for seawater and livewell usage.
https://www.seaflomarinerv.com/uploads/soft/20220905/1-220Z5113225331.pdf
seaflo Best 35PSI 3.3GPM hote sale 12v RV Fresh marine sea Water diaphragm Pump Low Pressure pump-SEAFLO https://www.seaflomarinerv.com/index.php?m=home&c=View&a=index&aid=476

About the system and pump I need your precious comments
Thanks in advance
Tuna

 

You’ll have a hard time keeping a steady flow of water into the baitwell with the intake hose dangling in the water.
Go ahead and install a proper through hull intake fitting with a seacock below the waterline.
An overboard drain line will also be needed.
The deck wash selector valve will work, but delicate baits will degrade quickly without a constant water supply, so a separate deck wash pump is preferable, or a significantly oversized pump to adequately supply both.

 

Tuna,

Do you shop at West Marine? I believe there were a few in Turkey at one time.

The series 21 pump only yields 4-5 litres per minute, maximum.
You won't get much pressure for cleaning your fish table but the volume of water may suffice.
And my final thought is it draws a lot of power, up to 4 amps.

EDIT: One other thing, it's not designed for continuous use, only "intermittent duty".

 

Dear kapnD,
I noted your warnings,
You are right at your point. During the deck washing livewell will close. This livewell will not be kind of tunatube, this will not required high waterflow. If the deck washing not too long this may be not problem. I think small weight with filter at the end of the hose to keep hose under WL.
I will put 2 drain lines one is above to free drain, one is bottom with the stopper to empty the water.
Thanks for your comment

 

Dear BlueBell,
I found this pump in a local marine market in Antalya. After this pump, I learned that this brand is so common in Turkey.
Hard to believe maybe the half of the fishing boats under 6m using bilge pumps of Seaflo.
Thanks for your comment,
I missed the intermittent duty, I was focused on the self priming pumps :/ At this situation this pump is not suitable.
I need to find suitable cost-efficient pump

 

The livewell pump and a washdown pump have different specs, usually. The washdown a super high flow rate. They share the same seacock and the strainer is before both as well.

The best people to call and see if it can be done the way you want is Flow-Rite in Michigan.

 

That is a high pressure pump that will work fine for a washdown. It has an automatic shut down when it reaches the maximum pressure, so you can use a valve to regulate how much flow there is in the livewell. However, the hose on the side will be a problem. If you don't want to drill a hole, a common solution is to install a pickup at the stern.

 

Hi gonzo,
In Turkey commonly used livewell valve is below. You can arrange the flow rate, I think automatic shutdown will suitable for this valve.
Stern pickup is logical solution when on the way, Its noted
Thanks!

 

Thanks for your reply fallguy, I will look at.

 

A high pressure, high volume pump will work for the deck.
Almost all of these pumps will have an automatic max pressure shut down to protect the pump motor.

If you try to restrict the flow to provide low flow to a live bait well, this pump will go to max pressure, shut down, restart, shut down, restart, shut down indefinitely.
You only have to try this with a deck wash down pump, most have a garden type valve on the end, open it part way to get low flow, and you can see what I mean

The life of the motor of such a pump cycling frequently will be pretty short. You said that you wanted it to be "cost-efficient" Purchasing pumps consistently is not cost efficient.
For a livewell you need a pump that will deliver what ever flow rate that you need for however water changes per hour that you are looking for. Liters per hour

 

Barry is right.
I suspect the most cost-effective design will have two, very different, pumps.

 

I've used a rule 17a for a wash down as well as a live well. We had it plumbed to the deck for 1.5 inch plumbing that could go to the deck for a small tote of crab/prawns and a cam lock that reduced it to 3/4 for a mid pressure wash down.

It worked good enough that my subsequent last 3 boats all got them as 12v deck was setups. When we clean halibut it's a mess, and the hydraulic wash downs made to much mess during the day and we're best used only at the end of the day. I'm guessing he bought every 12v washdown pump made, most burned out from the heavy use in about half a season. Some were very expensive, remember them going out mid trip and watching his eye start to twitch. Keep the backpressure low on the 17a and it seems to last a long time. My last one was probably four or five years old and had run many hours when it died.

Sadly they are getting spendy, but I've been happy with them. About three years ago a place had them on a big sale. Hopefully bought enough to finish out my career...

 

To prevent a high pressure pump from excessive cycling a pressure tank is the usual solution. They are cheap but take up some space.