pressure tanks plastic metal?

[kodiak]

Are the plastic type pressure tanks better than metal?What is the average life on tanks and are they all in the same ballpark?I have a welltroll wx-202 20 gal that is probably shot its about 8 yrs old.Sears has simer and tractor supply has dri something,grainger has dayton in the catalog,on **** they have a plastic one so does grainger its a dayton too.What would a 35 gal tank do for me compared to a 20?Is it all about pump cycles or does the pressure last longer with a bigger tank? thanks for any info steve.

[Bob NH]

Are the plastic type pressure tanks better than metal?What is the average life on tanks and are they all in the same ballpark?I have a welltroll wx-202 20 gal that is probably shot its about 8 yrs old.Sears has simer and tractor supply has dri something,grainger has dayton in the catalog,on **** they have a plastic one so does grainger its a dayton too.What would a 35 gal tank do for me compared to a 20?Is it all about pump cycles or does the pressure last longer with a bigger tank? thanks for any info steve.

The drawdown of a tank is about 30% of the volume of the tank for a pressure switch setting of 30 to 50 psi. Pressure will drop more slowly with a larger tank.

The drawdown should be at least eaqual to the GPM capacity of the pump for small pump (Maybe up to 1 HP) and 2 minutes for larger pumps. That means that for a small pump the actual volume of the tank should be about 3 times the GPM rating of the pump.

"Plastic" tanks are usually fiberglass reinforced plastic. The life-limiting element of most tanks is the bladder, although I have seen some painted steel tanks rust out at a weld before the bladder fails. I have never heard of a fiberglass reinforced vessel failing before the bladder fails.

[speedbump]

I don't care for the bladder in the Fiberglas tanks. They are inferior compared to the two top of the line Manufacturers; Well-X-Trol and Flexcon.

All the places you mentioned where you are shopping sell the inferior tank brands as they are cheaper. Whether they are metal or plastic.

bob...