Techniguard R-Series Vacuum Jacketed Piping (VJP)

High-Efficiency, Configurable Vacuum Insulated Pipe

The high thermal performance of Techniguard R-Series rigid vacuum insulated pipe often saves our customers enough liquid nitrogen to pay for itself in less than a year. Our rigid pipe is maintenance free and warranted for ten years!

  • Delivers significant lifetime savings due to minimal cryogen loss.
  • Easily accommodates future expansions or modifications.
  • Provides longer, care-free service life, backed by our best-in-the-business warranty.
  • Provides a rapid return on your investment.
  • Easy Installation – manufactured in easy-to-assemble sections with high-efficiency, low heat leak bayonet connections. No welding or refitting in the field required, it’s even easier to install than foam covered pipe!
  • Doesn’t need expensive vacuum pumps that require maintenance like dynamic vacuum-jacketed systems.
  • ASME certification and CRN (Canadian Registration Number) are available.

Cryogenic liquids are used in a wide variety of applications from biotechnology to theater, but some of the more common applications for VJP include:

Electronic and Semiconductor

Cryogenic liquids are used for component testing, temperature control, and more efficient storage/delivery of specialized gases. Manufacturers use our products to deliver cryogenic liquids from the supply tank to the use point and liquid control for semiconductor manufacturing.

Laboratory, Medical, Pharmaceutical, and Biotechnology

Techniguard vacuum insulated pipe is used to transfer and deliver many different cryogenic liquids from storage vessels to the point of use with reduced sweating and dripping that other solutions have. We offer special R-Series tube size models for these applications.

Food and Beverage

Food chilling, food freezing, and inerting bottles, containers, and bags before filling. Anywhere cryogenic liquids are used in processing, vacuum jacketed pipe ensures the highest quality liquid is transferred from the bulk tank to the use point with minimal liquid loss.

Aerospace and Industrial

Our vacuum jacketed systems are used in space and aeronautical research applications.

All Techniguard vacuum jacketed pipe is liquid nitrogen, carbon dioxide, argon, and hydrogen ready. Liquid oxygen and liquid helium options, along with ASME B31.3 certification and CRN (Canadian Registration Number) are available.

Techniguard R-Series VJP Specifications
Model Nominal
Pipe Size
Outside Diameter
in Inches (mm)
M.A.W.P. in
PSIG (bar)
Dry Weight
lb/ft (kg/m)
R50T 1/2″1 x 1 1/2″1 1.50 (38) 150 (10.3) 1.2 (1.7)
R65T 5/8″1 x 1 1/2″ 1.90 (48) 150 (10.3) 1.5 (2.2)
R50 1/2″ x 2″ 2 3/8 (60) 150 (10.3) 2.2 (3.2)
R75 3/4″ x 2″ 2 3/8 (60) 150 (10.3) 2.3 (3.4)
R100 1″ x 2 1/2″ 2 7/8 (73) 150 (10.3) 3.4 (5.0)
R150 1 1/2″ x 3″ 3 1/2 (89) 150 (10.3) 4.3 (6.4)
R200 2″ x 4″ 4 1/2 (114) 150 (10.3) 5.5 (8.2)
R300 3″ x 5″ 5 9/16 (141) 150 (10.3) 9.4 (14)
R400 4″ x 6″ 6 5/8 (168) 150 (10.3) 11.5 (17)
1 Stainless steel tubing, not Nominal Pipe Size (NPS).

Rigid pipe is made with welded or seamless ASTM A312 or A269.

Contact a representative for our installation guide if more detailed specifications are needed.

VJP is essentially two pipes, one within the other. The cryogenic liquid flows through the inner pipe. The outer pipe serves as a vacuum jacket which houses the inner line, the vacuum space, a molecular sieve, getters, and the super-insulation. Our vacuum insulated pipe has extremely low heat leak, minimizing cryogen loss from boil-off.

Techniguard vacuum jacketed pipe is constructed of 300 Series stainless steel pipe or tubing.

vjp-cross-section

  • The inner pipe is suspended within the outer pipe by low thermal conductivity radial supports to reduce heat transfer through conduction.
  • Technifab utilizes a vacuum and multi-layer insulation (MLI) to reduce heat radiation and convection, creating the lowest heat transfer rate of any cryogenic piping system.
  • A special molecular sieve and chemical getters remove residual molecules and impurities from any outgassing contamination.

Techniguard R-series construction means the heat loss may be reduced by over 400 times when compared with bare copper pipe. Techniguard VJP is superior to traditional foam insulated pipe; the typical heat loss for foam insulated pipe is 40 times greater than Techniguard!

Cut-away view of Vacuum Jacketed Pipe
Cut-away view of Vacuum Jacketed Pipe

R-series vacuum jacketed pipe offers our lowest heat leak and best performance, with superior durability. Expansion joints are located on the inner pipe to allow for contractions caused by cryogenic temperatures. Our rigid pipe will be maintenance-free for ten years. And the bayonets allow easy connection to our Techniguard B-Series vacuum jacketed pipe.

Technifab has extensive experience in manufacturing vacuum jacketed pipe systems. We were the first to introduce modular vacuum jacketed piping, keeping prefabricated sections of Techniguard VJP, modular valves, gas vents, and gas traps in stock to quickly deliver systems or replacements when you need them. We also custom design and manufacture cryogenic pipe systems to your exact requirements.

Read the article from the May 2004 issue of Food Manufacturing on our VJP installation at Schneider Foods.