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Bring the Heat: Carbon and Alloy Tubing

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The leading choice of utilities and boiler industries for decades. Plymouth knows the challenges involved in producing quality tubing that can stand up to the rigors of high pressure, high temperature applications. Plymouth Tube’s state-of-the-art manufacturing processes and advanced inspection and testing procedures ensure products that meet the most stringent requirements, such as the Department of Energy’s requirements for fossil fuel plants, electric power plants, industrial processing plants and cogeneration facilities. Oil and natural gas manufacturers rely on Plymouth’s products for their accessory equipment used in exploration, drilling and production. They choose Plymouth products for their strength, corrosive resistance, weight reduction and total cost savings. Plymouth products can prolong equipment life cycles and minimize the need for replacement. An experienced provider to the entire energy industry, Plymouth has the product and market knowledge, and the mill capabilities, to deliver the right solution for tough application requirements.


Boiler Tubing

Seamless cold drawn and hot finished carbon and alloy steel boiler and superheater tubing


Plymouth manufactures according to ASTM/ASME specifications among many other international standards (BS, DIN, JIS).


Seamless Hot Finish Tolerance Variations per ASTM A450

Wall Tolerance (Over 0.180” Wall)

3” OD & Under +22% / -0%

Over 3” OD +22% / -0% OD

Tolerance (All Walls)

3” OD & Under +0.016” / -0.016”

Over 3” OD +0.016” / -0.024”

Tolerances Seamless Cold Finish Tolerances per A450

Wall Tolerance (Over 0.180” Wall) 3” OD & Under +22% / -0% Over 3” OD +22% / -0% OD

Tolerance (All Walls)

Over 1 ½” OD to 2” OD, excl. +0.008” / -0.008”

2” to 2 ½” OD, excl. +0.010” / -0.010”

2 ½” to 3” OD, excl. +0.012” / -0.012”

3” to 4” OD, incl. +0.015” / -0.015”

Over 4” OD +0.015” / -0.025” 1


  • Boilers
  • Heat exchangers
  • Superheaters
  • Gas and steam turbines
  • HRSGs

Pressure Tubing

  • Seamless carbon and alloy steel heat exchanger and condenser tubing
  • Seamless carbon and alloy steel low temperature service tubing


  • Heat exchangers
  • Condenser tubing

Oil & Gas (Mechanical) Tubing

Seamless Cold drawn and Hot finished carbon and alloy steel tubing


Plymouth manufactures according to ASTM. ASME, customer specifications and ensures compliance with API standards.


4130, 4140, 8630



  • Sucker rod couplings
  • Pump barrels
  • Pipe recovery tools
  • Gas lift mandrels
  • Perforator guns
  • Pup joints
  • Blast joints
  • Stator tubes
  • Other accessory products

Value-added Services„

  • Quench and temper
  • Heat treating
  • Special end finishing available
  • Small minimum order quantities
  • Meet specifications of the American Petroleum Institute (API)
  • Local inventory of standard product at Plymouth distributors
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