filling a scuba tank from empty to 3k psi

[pcpfan37]

just a quick question for some one who has done it 

if i wanted to fill a scuba tank from empty to 3k psi using a hatsan spark compressor do i need to let the compressor fill hose pressure build up to 3 k before opening the valve on the scuba tank ?? or can i start the compressor open the valve on the tank and let it fill ?? ive never filled one from empty before im sure i could figure it out but figured id ask and see if 

anyone has done it that would know the best option to get it filled 

thanks for any info 

pcpfan37

 

[Glem.Chally]

I would get the pressure within a couple hundred PSI in the hose and open the tank valve slowly. Thats what I do on another brand compressor. 

 

[JimNM]

From zero, fill with an open valve. After 20 mins of run time, close the tank valve open the compressor bleed valve and shut off the pump. Leave power on to keep the cooling fan running. Allow to cool for 30+ minutes.

BE SURE TO NEVER START THE COMPRESSOR WHILE THE FILL HOSE HAS PRESSURE IN IT.

Open the bleed valve, start the pump and allow 5 seconds before you close the bleed valve. Bring fill hose close to tank pressure, then slowly open tank valve to put air into your tank.

Again, never start the pump with pressure in the hose. Ask me how I know . Take your time and the pump will give you a long service life.

 

[Eaglebeak]

If the tank that you are filling is empty, there is no reason to pressurise the line before opening the valve. Even if you are topping off a half-full tank, it's not necessary to equalize the pressure as long as you open the valve slowly. Filling a SCUBA bottle from empty is a big ask from a Hatsan Spark. It may be doable but only in stages. Filling without stopping for breaks may be asking for trouble.

 

[Glem.Chally]

Oh right, tank is at zero. Haha, use my directions for topping off a tank.

 

[pcpfan37]

thanks for the info guys 

not looking to do a complete fill from empty in one shot will probably fill 1k at a session then let it cool off once we get it full it will mostly only need topped off after that so 

the spark should be able to handle that pretty well 

ill try filling from zero without pressurizing the line n see how it goes ill fill to 1000 then give it a break fill another 1000 break then top it off at 3 k on the last run 

should work well we will see 

pcpfan37 

 

[JimNM]

Time is more important that bottle pressure. Raise in pressure is not linear. 20 mins at a time. Really.

 

[ChuckHunter]

That spark is not designed for that kind of volume!!! Go real slow or your compressor is not going to last long...that tank from empty is probably like filling 50 guns in run time...

James from Michigan