Larry C wrote:dh wrote:I've read about this while researching the recertification process. As steel prices went up, tank wall thickness went down, as did the pressure rating.
Larry, when you hydro test a hose, how much pressure do you put on it?
dh,
The hoses I work with are High Pressure which have a MWP (max working press) of 350 PSI for LPG (1 PSI for nat gas). The layline on the hose will show the MWP.
Some guidelines recommend a new hose assy. be tested at 2 times the WP (working pressure). In this case, 350PSI WP= 700PSI test pressure (proof pressure). Used hose at 1.5 times WP. For safety I do all testing in a 1/4" welded steel containment box!!
Hydrostatic testing should only be preformed by trained personnel. Also hydro testing is just a spot check to confirm the assembly meets specifications at the time of the test. However, many conditions affect the performance of a hose when it's put into service. Age, operating environment, etc. all affect the longevity of any hose. Periodic re-testing or replacement is strongly recommended.
BTW/ I wouldn't recommend using high pressure air to test your "old" bottle.
L
Do you consider 150 PSI high pressure?
I was asking more for my own curiosity than anything else. I knew it had to be HIGH to get water spraying out of the hose jacket. I've experiance hydraulic hose failures first hand in both ag and industrial settings. The latter on a gas oven door. The hydraulic fluid caught on fire as it was spraying everywhere, almost burnt the entire factory down.