SEMIFLEX® Piping Systems

Major Component Descriptions

SEMIFLEX® is available in both sealed and dynamic vacuum. The sealed vacuum pipe is constructed of Stainless Steel and the dynamic vacuum pipe is constructed by either OHFC copper or Stainless Steel. Dynamic SEMIFLEX® is continuously evacuated by a pump to provide a dynamic vacuum. Both sealed and dynamic systems consist of SEMIFLEX® pipe with the addition of elbows, crosses, tees and end fittings for connection to the source of supply and the points of outlet. These systems can be simple point-to-point hook up, or for a multi-branch network supplying an entire plant from a single storage tank.

Triax pipe is similar to SEMIFLEX® pipe, but consists of three concentric tubes. Vacuum is maintained in the outer annular space. Triax systems consist of SEMIFLEX® line and fittings from the supply source to a Liquid/Vapor Phase Separator. The separator continuously removes any gas generated by heat loss and pressure drop, venting it to the outside and maintaining internal pressures in the system at approximately one atmosphere. Liquid is supplied to the use points via Triax pipe from the separator. Gaseous nitrogen returns continuously to the separator in the annular space between the inside and middle tubing.
Triax systems are used where the rapid discharge of liquid nitrogen caused by high tank pressures is undesirable.

 

MICROtorr II Vacuum Pump

The MICROtorr II Dynamic vacuum pump evacuates and holds the insulation vacuum for SEMIFLEX® systems at levels of 1 x 10-6 torr or better, a range in which liquid nitrogen can be piped with minimum loss and least cost. It is a clean, quiet and vibration free pump station and an air-cooled oil diffusion pump with cooling fan designed for reliable and continuous 24 hours a day operation. Maintenance is extremely simple, requiring only routine oil level checks. The pump station includes an integral
valve which closes in the event of power interruption and keeps your SEMIFLEX® system operable.

 

Installation and service

Installation is quick, easy and less costly than other liquid nitrogen piping systems. A prefabricated SEMIFLEX® system arrives at your facility in numbered sections with illustrated installation manuals. The bendable nature of the pipe reduces the number of joints and plant modifications necessary for hanging.
Bayonet connections help simplify installation. Our engineers inspect each new system after installation and conduct a series of tests to confirm vacuum integrity and proper operation. In addition, our service technicians can be called upon anytime to modify your existing system or accommodate an expansion. Vacuum Barrier's service and support helps you reach your maximum savings from SEMIFLEX® year after year.

 

Quality Control

You can count on SEMIFLEX® systems to provide reliable, trouble free performance over a long product life. The entire manufacturing process for all system components is conducted in house under strict quality control programs. SEMIFLEX® systems are tested before, during and after assembly. Quality control includes a series of helium mass spectrometer vacuum integrity tests to 1 x10-9 std. cc per second. During assembly the test is repeated – again at the ambient temperature and pressure.When the assembled pipe has passed these tests it is cooled down to -320° F with pressure applied. This vacuum integrity test, with the inner line under pressure and at cold temperatures, simulates field conditions and assures reliable performance.

 

Warranty

Both Sealed and Dynamic SEMIFLEX® systems are backed by the industry longest warranties to protect against loss of vacuum integrity and defects in materials and factory workmanship. Inspection services for warranty claims are provided at no charge.

 

 

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