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The complete catalog contents must be reviewed to ensure that the system designer and user make a safe product selection. When selecting products, the total system design must be considered to ensure safe, trouble-free performance. Function, material compatibility, adequate ratings, proper installation, operation, and maintenance are the responsibilities of the system designer and user.
Do not mix or interchange valve components with those of other manufacturers.
Home > Products > Sample Cylinders > DOT Compliant

DOT Compliant

Double-Ended Cylinders
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Swagelok® Sample Cylinders

Sample Cylinders DOT Compliant

Swagelok offers a range of DOT- and TC-compliant doubled-ended and single-ended sample cylinders, as well as miniature sample cylinders, cylinder accessories, and outage tubes.


Pressure Ratings


DOT / TC Compliance
Up to 5000 psig (344 bar)
304L and 316L stainless steel, alloy 400
40 to 3875 cm³ (up to 1 gal)
DOT-3E 1800 / TC-3EM 124;
DOT-3A 1800 / TC-3ASM 124;
DOT-3A 5000 / TC-3ASM 344;
DOT-SP7458 1800
Up to 500 psig (34.4 bar)
304L stainless steel

150 to 500 cm³

DOT-4B 500
1000 psig (68.9 bar)
316 stainless

10 to 50 cm³

Not applicable

Additional Products

See sample cylinders, cylinder valves, and accessories compliant with TPED.


  • Body made of seamless tubing provides consistent wall thickness, size, and capacity.
  • Smooth internal neck transition allows easy cleaning and eliminates trapped fluids.
  • Cold-formed female NPT threads provide greater strength.
  • Heavy-wall end connections provide strength and resist flaring.
  • Full-penetration gas tungsten arc-weld construction provides leak-tight sample containment.


Double-Ended Cylinders
  • Each DOT cylinder is hydrostatically tested to at least 5/3 the working pressure. All testing of DOT cylinders is witnessed by a DOT-approved independent inspection agency.
  • DOT-3E 1800/TC-3EM 124 cylinders are hydrostatically proof tested at 3050 psig (210 bar). One cylinder of each lot is burst tested.
  • DOT-3A 1800 and 5000/TC-3ASM 124 and 344 cylinders are marked with a serial number. Volumetric expansion of each cylinder during hydrostatic testing must be within the limits set by DOT Specification 3A and TC Specification 3ASM.
    • DOT-3A 1800/TC-3ASM 124 cylinders are hydrostatically proof tested at 3000 psig (206 bar) minimum.
    • DOT-3A 5000/TC-3ASM 344 cylinders are hydrostatically proof tested at 8500 psig (586 bar) minimum.
  • DOT-SP7458 1800 cylinders are hydrostatically proof tested at 3000 psig (206 bar).

Single-Ended Cylinders
  • DOT-4B 500 cylinders are hydrostatically proof tested at 1000 psig (69 bar) minimum.

Ministure Sample Cylinders
  • Every miniature sample cylinder is proof tested at 1667 psig (114 bar) with dry nitrogen gas.

Overpressure Protection

Compressed gas cylinders must be equipped with pressure relief devices in accordance with United States DOT regulations and CGA S-1.1.

Rupture Disk Units Rupture Disc Units

Swagelok rupture disc units protect sample cylinders from overpressurization by venting the cylinder contents to atmosphere. The rupture disc is welded to a body that is threaded into a valve body or a rupture disc tee and sealed by an elastomer O-ring. Nonrotating stem needle valves with rupture disc units and rupture disc tees are also available.

Options and Accessories

Sample Cylinders DOT and TC Compliant
  • PTFE coating
  • Electropolishing
  • Additional marking
  • End caps
  • Caps and plugs
  • Carrying handle

Outage Tubes
1. Outage tube
2. Liquid
3. Vapor space
4. Total volume

Outage Tubes

Outage tubes provide a vapor space of the desired volume in cylinders containing liquefied gases, so that liquid in the cylinder can expand if the temperature increases. Without enough vapor space, a small temperature increase can cause the liquid to expand and increase the pressure dramatically. See local regulations and other appropriate guidelines for safe filling limits for your application.

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