Bendable Vacuum Jacketed Pipe (VJP) - Techniguard™

Economical, High-Efficiency LN2 Transfer Piping

Techniguard™ bendable vacuum insulated pipe is an effective, cost-efficient piping system designed to transfer liquid nitrogen (LN2) from a bulk storage tank to points of use.

Flexibility and cost savings are the key factors in considering the implementation of a Techniguard™ vacuum insulated pipe system over traditional rigid piping or vacuum insulated systems.  When low cost rapid installation is of primary concern and insulative qualities are required to prevent excessive loss of product, bendable pipe is a good alternative to rigid vacuum insulated pipe.  Techniguard™ Bendable Pipe has several advantages over more traditional rigid Vacuum Jacketed Pipe (VJP); all of which translate into cost savings to the customer along with improved system options for growing plant operations.

Advantages

• Simplifies system layout requirements

  — Flexibility reduces the necessity for precise system layout measurements.
  
  

• Installation

  — Bendable piping requires less precise layout measurements than rigid pipe.  No welding or refitting in the field required.
  
  

• Reroute/reuse system

  — Flexibility allows much or all of a system to be reused if use-point locations are changed, i.e. plant layout is changed.  You can also add to the existing system without major rework expenses.
  
  

• Lower shipping costs

  — Flexibility allows cryogenic pipe systems to be coiled and crated for shipment via motor or air freight.  The need for expensive dedicated trucks is eliminated.  Overseas shipment is no longer cost prohibitive.
  
  

• Rugged construction for virtually maintenance-free operation

  
  
  

• Costs less than rigid pipe

Suggested Applications

Techniguard™ Bendable Vacuum Insulated Pipe can be used in any situation where liquid nitrogen needs to be transferred from a bulk storage tank to any number of user points.  Techniguard™ is well suited for any of the following installations:

• Start-up operations

• Operations where substantial plant growth is anticipated

• Laboratories where future rerouting of cryogenic pipe system may be necessary

• New product launch facilities that need to be brought on line quickly

• Economical replacement of old, inefficient (leaky) LN2 piping

By its flexible nature, bendable pipe may be used in a variety of applications not possible for rigid pipe, such as the filling of MRI magnets from portable dewars and the connection of liquid nitrogen food freezers and deflashers to liquid bulk storage tanks.

Techniguard™ Specifications for Bendable Pipe

	Series 16	Series 32
End Terminations	1/2 in. MPT or smooth tube Bayonet JIC MPT	1 in. MPT or smooth tube Bayonet JIC MPT
Materials	300 Series stainless steel
Outer Covering	UV resistant shrink tube
Outside Diameter	1.7 in.	2.5 in.
Inside Diameter	.625 in.	1.25 in.
Minimum Bend Radius	12 in.	18 in.
Maximum Length	60 ft.
M.A.W.P.	200 psig	125 psig
Heat Leak	0.8 BTU/ft/hr @-320°F	1.6 BTU/ft/hr @-320°F
Weight	0.9 lb/ft.	1.14 lb/ft.

Pipe Construction

The pipe is constructed of convoluted inner and outer tubing.  The inner tube serves as the LN2 carrier.  The outer tube contains the vacuum jacket.  The inner tube is mechanically insulated with multi-layered super-insulation (MLS).  The MLS consists of alternating layers of reflective foil and non-conductive spacer material.  The insulated inner tube is loaded into the outer jacket.  The space between the two lines is evacuated to the highest industry standards.  The vacuum annulus contains appropriate getter materials to adsorb out-gassed molecules, thereby improving the vacuum.

Pipe Joints

Sections of Techniguard™ Bendable Pipe are connected via vacuum insulated bayonet connectors.  These connections provide a frost-free joint between cryogenic lines.  Bayonet connections simplify installation by eliminating the need for threaded or welded field joints and the associated foam insulation or wrapping.

Quality Assurance

Techniguard™ Vacuum Insulated Pipe and connections are fully guaranteed to be free of defects and are backed by a 3-year warranty.

System design

Regardless of the size, complexity or location you envision, Technifab can design the system right for your installation.

Download Bendable VJP Sales Information

Read the article from the Summer 2006 issue of Cold Facts on Flexible Transfer Hoses for Cryogenic Fluids.

For more information or to request a cost/thermal performance analysis of your plant's cryogenic pipe system or a quote please contact us.