small compressor installed on a boat?

[iain/hsm]

Your other consideration if you go down the 3 phase route would be to consider what is called a soft start.
Again although you have vendor options the best is again the Siemens SIRIUS range

Although in USA the Schneider unit is half the price and popular with the scuba compressor boys its runs way to hot IMHO inside a box with all the other junk on a hot deck inside a yacht in the tropics.

Photo enclosed below kind of explains it better and why I get to swap them out

 

[CG43]

I have enclosed below the ABB Motor IEC 60034-30-1 published standards to add to your brain loading.

Thank you for the ABB efficiency table.

As a private individual on his own yacht, to my knowledge, there is no regulation that specifies the required efficiency class.
With a 230 V/400 V motor, I assume it is located below deck or otherwise well protected against water.
A fast and sensitive residual current device is required for safety but that is self-evident.

Supplement to the speed reduction:
In sliding bearings with liquid friction, the hydrodynamic pressure is generated by the speed of the surfaces in relation to each other and is therefore speed-dependent.
In the linked video, the man allows the motor to ramp up in 20 seconds. That seems unnecessarily long to me; 3 seconds should be sufficient and better for the compressor .

 

[iain/hsm]

Thank you for the ABB efficiency table.

As a private individual on his own yacht, to my knowledge, there is no regulation that specifies the required efficiency class.
With a 230 V/400 V motor, I assume it is located below deck or otherwise well protected against water.
A fast and sensitive residual current device is required for safety but that is self-evident.

Now that's two very Interesting points. Currently in the EU there are requirements on suppliers and manufacturers to comply with a range of increasingly changing government legislation.
For example currently a new build with a 7.5 Kw 10 BHP and all sizes over, the motor must be at least EFF3 and soft start.
While smaller motors that once were exempt we are now expecting these to be dragged in once the EEF 4 efficiency rating motors become mandated by law for the larger motors. Although EFF4 on a 2.2Kw would not be in any way practical. However in the USA a simple DOL starter panel are still common even with the 18 to 22Kw motors 25-30 BHP range.

Although regulations may not be a mandated requirement it is still worth consideration for yacht owners to calculate the capacity KvA of the generator and the starting power requirements of the compressor motor into the mix.

As for your second point I fully agree a high quality residual current operated circuit breaker between live and neutral would be high on any yacht owners list especially being able to operate without a proper land based in the ground earth connection.

To many professional divers have died in harbours cleaning hulls and prop inspections by electrical current induced heart attacks than is currently acknowledged or even considered.
While cause of death on the death certificate may be written up as a heart attack the risk of electrocution should be another item on the headache list for the poor OP.

 

[iain/hsm]

An alternative not yet mentioned would be to find a RIX SA-3 on the used market

No more oil changes or filters to worry about

Here is an old old post from our favorite curmudgeon:
RIX SA-3E Compressor 60Hz Motor Drive Configurations

I personally have a SA-3 and find it similar to the legendary “bees knees”

I resemble that remark.

But someone once said:

"How can I sour like an eagle when I work with turkeys" LOL

 

[BRT]

I'm sorry but that statement is simply not true and for multiple reasons.

1. You have a splash lubricated crankcase on the Bauer Junior 11. As with many other small oil lubricated portable compressors. Some of the larger units may even have an oil pump known as a gearoter pump but again all types of oil lubricated compressor are subject to RPM.

Too slow an RPM and the oil slinger doesn't fling enough oil up from out of the sump and onto the moving parts or by another example take the gearoter mechanism type on the Oceanic when running too slow this hasn't got enough RPM to create enough oil pressure to pump the oil out of the sump and up onto the moving parts the crankshaft bearings, conrod, guide cylinders and pistons etc if running too slow.

2. The inclination of the pump on a rolling deck is another hugely damaging consideration for small portable compressors on a yacht.
Further take say the Coltri MCH6 and their new ICON range these only have a 5 degree and a 6 degree angle of inclination in a stationary position on land any more in one plane and there is in effect no oil in the sump and that coupled with a low RPM is a huge bill a comin. Take the other angles on a yacht the pitch and roll aspects and too much oil slugs up with a hydraulic lock risk conversely the other extreme of the angle incline is oil starvation.

3. Also you need to achieve sufficient cooling and the fan is directly affected by the RPM
Again for offshore we change the pitch angle of the fan blades and the number of fan blades depending on the ambient air temperatures location flow and pressure but again critically the RPM

So I trust you appreciate that while there is granted a very small narrow band range of RPM available it is critical not to under run or over run these limiting factors in a typical oil lubricated recreational sports scuba compressor.

You may not have noticed I was speaking to someone who thought you could only run them at motor speeds. You can run a belt drive compressor at any speed you want to. It may not lubricate or cool correctly.

 

[Tief*]

Bauer JR’s are great compressors! Also great to fill ccr bottles.