Cylinder ID
- Thread starter Arkman
- Start date
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Norris Industries
OP
Arkman
Contributor
That makes sense, any thoughts on the other specs?
Scared Silly was guessing a LP78, but wasn't sure.
Scared Silly was guessing a LP78, but wasn't sure.
You depict a low pressure steel tank.
DOT = US Department of Transportation
3AA = seamless steel cylinder
2730 = Service pressue of 2730 PSI
3025888Y = manufacturer's serial number
TC = Transport Canada
3AA = Chromoly steel
M = not sure, but I assume "metric"
209 = Service pressure in Bar
REE 51 mL = this means the cylinder cannot expand by more than 51mililiters (51cc) during hydrostatic testing for the cylinder to receive the "+" rating allowing for it to be filled 10% above the stated service pressure.
89 H = I have no idea
First Hydro was August 2004 and the tank received a "+" rating so that it can be filled to 10% above the 2730 PSI rated service pressure, giving it an approximate 3000psi service pressure
2nd hydro was September 2012, no "+" rating was given, so the service pressure drops back to 2730 PSI.
3rd hydro was January 2017, again no "+" rating.
4th and current hydro was January 2022, again no "+" rating so fill/service pressure is 2730 PSI.
The markings between the month and year of the hydro tests indicate the testing facility that conducted the hydrostatic test on the tank.
-Z
DOT = US Department of Transportation
3AA = seamless steel cylinder
2730 = Service pressue of 2730 PSI
3025888Y = manufacturer's serial number
TC = Transport Canada
3AA = Chromoly steel
M = not sure, but I assume "metric"
209 = Service pressure in Bar
REE 51 mL = this means the cylinder cannot expand by more than 51mililiters (51cc) during hydrostatic testing for the cylinder to receive the "+" rating allowing for it to be filled 10% above the stated service pressure.
89 H = I have no idea
First Hydro was August 2004 and the tank received a "+" rating so that it can be filled to 10% above the 2730 PSI rated service pressure, giving it an approximate 3000psi service pressure
2nd hydro was September 2012, no "+" rating was given, so the service pressure drops back to 2730 PSI.
3rd hydro was January 2017, again no "+" rating.
4th and current hydro was January 2022, again no "+" rating so fill/service pressure is 2730 PSI.
The markings between the month and year of the hydro tests indicate the testing facility that conducted the hydrostatic test on the tank.
-Z
Tanks A Lot
Contributor
Just a couple of nitpicks, although Zef got it pretty much spot on.
3AA refers to the DOT standard the cylinder has to adhere to. This is defined in CFR 49 § 178.37 - Specification 3AA and 3AAX seamless steel cylinders.
The TC-3AAM refers to the transport Canada standard this cylinder has to adhere to. In Canada, a cylinder marked TC-3AA can only receive a 10% overfill if the + mark is present at the date of manufacture and the last inspection. A TC-3AAM cylinder however does not require a + mark or even consider it. Hence the service pressure of 209bar (3031psi) for the Canadian TC standard and only 188bar (2730psi) for the states DOT standard. If the + mark is present, the DOT standard would keep up so to speak and also allow a service pressure of 207bar (3003psi). A + mark on a TC-3AAM cylinder would not mean that it could be overfilled by 10%.
However, sometimes a TC-3AAM cylinder can be downgraded, so that it is only allowed 90% of it's service pressure. This is indicated by a "K" followed immediately after the service pressure in bar.
The 89H is very likely a running job number that a test station or shop has put on it for quicker identification.
As to what size the cylinder this is, measuring things like outer diameter, height and possibly weight could narrow it down. The markings do not show this.
3AA refers to the DOT standard the cylinder has to adhere to. This is defined in CFR 49 § 178.37 - Specification 3AA and 3AAX seamless steel cylinders.
The TC-3AAM refers to the transport Canada standard this cylinder has to adhere to. In Canada, a cylinder marked TC-3AA can only receive a 10% overfill if the + mark is present at the date of manufacture and the last inspection. A TC-3AAM cylinder however does not require a + mark or even consider it. Hence the service pressure of 209bar (3031psi) for the Canadian TC standard and only 188bar (2730psi) for the states DOT standard. If the + mark is present, the DOT standard would keep up so to speak and also allow a service pressure of 207bar (3003psi). A + mark on a TC-3AAM cylinder would not mean that it could be overfilled by 10%.
However, sometimes a TC-3AAM cylinder can be downgraded, so that it is only allowed 90% of it's service pressure. This is indicated by a "K" followed immediately after the service pressure in bar.
The 89H is very likely a running job number that a test station or shop has put on it for quicker identification.
As to what size the cylinder this is, measuring things like outer diameter, height and possibly weight could narrow it down. The markings do not show this.
runsongas
Contributor
the 2730+10% tanks along with 3000+10% and 3180+10% were generally referred to as mid pressure to differentiate from the 2400+10% modern LP and 3442/3500 psi tanks. the faber MP78 (technically 77.4cf @ 3003 psi) with the same service pressure were REE 58 i think, so the capacity is likely closer to 68 to 70cf but if you can get a water capacity from the hydrostatic tester, that will let you calculate it out more accurately.
Likely an MP78 but can't tell without dimensions. That seems to be the most popular of the Norris MP tanks.
Don't worry about the plus rating, just tell them to fill it in Metric.
Don't worry about the plus rating, just tell them to fill it in Metric.
OP
Arkman
Contributor
Thanks everyone for the info! I just did some measurements after I picked it up from my fill.
circumference = ~24"
Height = ~23.5"
Weight = 45.6 lbs @3200 psi (not sure why he did that much of an overfill...not my normal dive shop).
Does this help anyone norrow this down?
circumference = ~24"
Height = ~23.5"
Weight = 45.6 lbs @3200 psi (not sure why he did that much of an overfill...not my normal dive shop).
Does this help anyone norrow this down?
runsongas
Contributor
there is an old thread that has the same dimensions, but either 72 or 78 cf at rated + pressure is likely accurate. the buoyancy should be pretty negative though for that size and weight when filled.
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