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How Do DOT and ASME Cylinders Compare?
 
DOT 4500
 DOT 5000
DOT 6000
ASME
Cylinder Classification
DOT E 9421-4500
 DOT E 10869-5000
DOT E 9909-6000
ASME Code,
Section VIII, Division 1
 
 
Working Pressure (PSI)
4500
 5000
6000
5000 / 6000 or
7000 (Appendix 22)
 
 
Capacity (SCF)
444
 472
509
436 / 491 / 537
 
 
Test Pressure (PSI)
6750
 7500
9000
10500
 
 
Retest Period (yrs)
5
 5
5
N/A
 
 
Material
Steel
 Steel
Steel
Steel
 
 
Empty Weight (lbs)
144
 158
188
400
 
 
Internal Diameter (in)
8 3/4
 8 25/32
8 1/2
8
 
 
Outside Diameter (in)
9 5/16
 9 3/8
9 9/32
9 9/16
 
 
Minimum Wall Thickness (in)
0.26
 0.29
0.339
0.783
 
 
Height or Length (in)
without valve
51
 54 1/4
51
55
 
 
Valve
Standard on DOT
Available on ASME
Manifold type
with (2) ¼” ports positioned 180° apart
 CGA 347 with adapter for 1/4" npt male
Manifold type
with (2) ¼” ports positioned 180° apart
Inlet / Outlet
with ¼” connection
 
 
Drain Port
No
 No
No
Yes
         
All chart values are nominal. Capacity referenced to 70 °F.
Under no circumstances are DOT E cylinders to be filled to a pressure exceeding the marked service pressure at 70 °F. 10% overfill is not allowed for these cylinders.
All ASME storage systems must be installed according to OSHA 29 CFR 1910.169, which, in part, states that each pressure vessel must have an indicating pressure gauge, a spring-loaded safety valve and moisture drain.
BAUER recommends ASME cylinders for all permanent installations.
Contact your local BAUER distributor or the local authority having jurisdiction for state and local code requirements pertaining to the use of high pressure air storage cylinders.

 
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