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Production Status of Worthington Steel Scuba Cylinders

In January 2014, Worthington ceased production of steel scuba cylinders, meaning there is no longer any manufacturer of hot-dip galvanized steel scuba cylinders qualified to DOT & TC specifications for the North American market. According to Worthington their Tilsbury plant, which primarily produced steel cylinders for the natural gas market, could no longer operate cost effectively in the face of competition from China. XS Scuba, who is the exclusive distributor of Worthington scuba cylinders, arranged to have a large production run prior to the plant closing. While we believe there is enough consumer demand for hot-dipped galvanized steel scuba cylinders that eventually a new source will tool up to fill the need, by Fall 2014 availability of specific sizes may be limited.



> X-Series Steel Cylinders by Worthington
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> X-Series Steel Cylinders by Worthington URL for this product

Prices include FREE continental 48 U.S. shipping!

Pro DIN/K Valve Dive Gear Express is proud to offer Worthington X-Series SCUBA Cylinders. We ship your Nitrox Ready cylinder with the valve installed (domestic ground US only). Unless you select no valve, the valve included in our price is a very high quality Thermo Pro DIN/K valve suitable for use with both DIN or Yoke regulator fittings. The cylinders ordered with valves have a current month Nitrox Ready decal.

SCUBA Tanks must be hydrostatically tested every five years (60 months). The larger primary steel cylinders typically have a factory hydro date between 3 and 12 months old, but not more than 18 months old. X7-80's and X7-65's may have a factory hydro date up to 24 months old as these are manufactured less frequently.

Features of All Steel SCUBA Tanks
from Dive Gear Express

  • Factory cleaned for oxygen service
  • Hot-dip galvanized external finish
  • Both U.S. DOT-SP14157 and Canadian TC-SU4957 markings
  • 0.750-14 NPSM (3/4 NPS) threaded neck opening
  • Thermo Pro valves are factory cleaned for pre-blended Nitrox up to 40% oxygen, using oxygen compatible o-rings and lubrication, and Nylon high pressure seat material.
  • The Thermo Pro valve meets CGA V9-2009 Compressed Gas Association Standard for Compressed Gas Cylinder Valves.

How to Select a SCUBA Tank

Our factual but easy-to-read article helps you make
this big decision by giving you information on:

  • Aluminum tanks versus steel tanks
  • Low-pressure tanks versus high-pressure tanks
  • Tank paints, coatings, and finishes
  • Tank dimensions and capacity recommendations

Click Here to read How to Select a SCUBA Tank.



Worthington Cylinders at Dive Gear Express

Cylinder Service
Pressure
(psi)
Diameter
(inches)
Height
(inches)
Weight
Empty
(pounds)
Buoyancy
Full : Empty
(pounds)
X7 Steel 65 3442 7.25 16.7 25.1 - 8.7 : - 3.9
X7 Steel 80 3442 7.25 19.8 29.9 - 9.0 : - 3.0
X7 Steel 100 3442 7.25 22.7 33.1 - 10.0 : - 2.5
X7 Steel 120 3442 7.25 27.7 39.7 - 11.0 : - 2.0
X8 Steel 119 3442 8.00 23.9 42.5 - 10.9 : - 2.0
X8 Steel 130 3442 8.00 25.3 44.7 - 11.7 : - 2.0
Comparison Only - Aluminum 80 3000 7.25 26.1 31.9 - 1.8 : + 3.2
Buoyancy specification for cylinder and valve in seawater.
Height dimension is cylinder only, i.e. less valve.
Specifications supplied by XS Scuba and accurate as of Fall 2013.

The Dive Gear Express "Deluxe Complete" Setup Includes:

  • Nitrox Ready Cylinder w/Boot
  • Nitrox Ready Thermo Pro DIN/K Valve
  • Spare Viton O-ring for Valve Face
  • Valve Protector Cap
  • Current Nitrox Ready Decal


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What Happened to Low-Pressure (LP) Cylinders?

Many experienced divers have traditionally preferred low-pressure cylinders because they are easier on regulators, have no short-fill concerns, and are more suitable for partial-pressure blending. The Faber LP-50 and LP-85 low-pressure steel cylinders have particular size and trim sidemount diving characteristics that are not currently available with any other cylinder. But with that exception, we no longer offer low-pressure cylinders.

The old low-pressure DOT 3AA design cylinders (2640 psi, i.e., 2400 with a +) are being replaced by modern high-pressure DOT SP design cylinders (3442 psi, no plus needed). That's because you can use the high-pressure 3442 psi cylinders as low-pressure 2640 psi cylinders if you prefer, simply by under filling. Manufactured from high-tech steel alloys, the 3442 psi DOT SP cylinders have the same length, diameter, and capacity at lower 2640 psi pressure as the 3AA cylinders. Even better, the empty weight of the modern cylinder design has been reduced slightly, yet the buoyancy remains slightly negative when empty.

One idea we like is selecting a larger capacity cylinder and then deliberately under fill. For example the X7-100 yields 89 cubic feet at 3000 psi, and the X8-119 yields 107 cubic feet at 3000 psi. That is plenty of gas for most dives, puts an end to short fills, and the lower pressure is easy on equipment, yet allows the option of a high-pressure fill when you need really need more gas. This is how divers have for years been using overfilling with low-pressure cylinders, but with the advent of the large-capacity high-pressure cylinders, it eliminates the concerns regarding overfills.

Variable Capacity of Cylinders

Cylinder 2640 psi 3000 psi 3442 psi
X7 Steel 80 64 cu. ft. 72 cu. ft. 80 cu. ft.
X7 Steel 100 80 cu. ft. 89 cu. ft. 100 cu. ft.
X7 Steel 120 96 cu. ft. 107 cu. ft. 120 cu. ft.
X8 Steel 119 95 cu. ft. 107 cu. ft. 119 cu. ft.
X8 Steel 130 104 cu. ft. 117 cu. ft. 130 cu. ft.


Warning
WARNING
According to our suppliers, their products described as Nitrox Ready are compatible with oxygen and cleaned for oxygen service. Nonetheless, the 'clean state' of this equipment applies only prior to initial use. Thereafter, periodic inspection and cleaning are a necessity. You must meticulously follow the recommendations of the US Department of Transportation (DOT), Compressed Gas Association (CGA), and other federal/state/local agencies, plus your dive training agency for equipment maintenance, handling, storage, labeling, filling, transport and use of compressed gases. Oxygen-related fires and explosions can result in serious injury or death. Ultimately, you must make the final decision to assume all risks associated with the use of any compressed gases, including those in excess of 23.5% oxygen.

Related Products

Aluminum SCUBA Tanks Cylinder Valves by Thermo Doubles Packages for Cylinders Vindicator Handwheels for Scuba Valves
URL for this Pricelist

Pricing for Steel SCUBA Cylinders (Tanks)

Cylinder prices do include FREE continental 48 U.S. domestic shipping.

Cylinder prices do NOT include international shipping, or shipping to Alaska, Hawaii, APO/FPO, APO/FPO, or U.S. Territories. Our cylinders and valves are Imperial 3/4 NPS neck threads, NOT Metric M25 neck threads, and the valves have overpressure relief devices. The cylinders have US DOT and Canadian CTC markings suitable for use only in North America. Our cylinders and valves are NOT CE approved and NOT suitable for use in the European Union.

Image Item SKU Description Ship Status US $ Price
[ ]

  Worthington Industries  
Worthington X7 Steel  80 Cylinder, galvanized  SPM-X7-80 Worthington X7 Steel 80 Cylinder, galvanized
In Stock  $375.00
Worthington X7 Steel 100 Cylinder, galvanized  SPM-X7-100 Worthington X7 Steel 100 Cylinder, galvanized
In Stock  $425.00
Worthington X7 Steel 120 Cylinder, galvanized  SPM-X7-120 Worthington X7 Steel 120 Cylinder, galvanized
In Stock  $450.00
Worthington X8 Steel 119 Cylinder, galvanized  SPM-X8-119 Worthington X8 Steel 119 Cylinder, galvanized
In Stock  $450.00
Worthington X8 Steel 130 Cylinder, galvanized  SPM-X8-130 Worthington X8 Steel 130 Cylinder, galvanized
In Stock  $475.00
  Cylinder Options  
Nitrox Tank Wrap Decal, Small {17 in x 1.5 in | 43 cm x 4 cm}  SPM-D-NITROX Nitrox Tank Wrap Decal, Small {17 in x 1.5 in | 43 cm x 4 cm} In Stock  $4.00
Nitrox Tank Wrap  Decal, Large {24 in x 6 in | 61 cm x 15.2 cm}  FX6520 Nitrox Tank Wrap Decal, Large {24 in x 6 in | 61 cm x 15.2 cm} In Stock  $6.00
Boot, Replacement for X7 Steel Tanks  SPM-TBX7S Boot, Replacement for X7 Steel Tanks In Stock  $16.00
Boot, Replacement for X8 Steel Tanks  SPM-TBX8S Boot, Replacement for X8 Steel Tanks In Stock  $16.00

All Dive Gear Express financial transactions are in United States Dollars (US $).
Prices in currencies other than US $ are approximations and should be used as a guide only.

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