Is my burner safe?

[saadat68]

Hi
I have a small melting furnace that works with propane gas cylinder.
I have built a homemade burner for it but I am worry about it's safety.

I added a flashback arrestor to my burner but it didn't work so I remove it. Is it safe without flashback arrestor?

I don't use welding torch or oxygen tank but I use an air blower.
Can blower blows oxygen/air to propane gas tank for example when gas proportion in tank is 5 or 10 percent and pressure is low?

Thanks