MD ANDERSON Project No. XX-XXXX / MD ANDERSON PROJECT NAME
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SECTION 43 62 23 – VACUUM INSULATED PIPE

PART 1 - GENERAL

1.01RELATED DOCUMENTS

  1. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division01 Specification Sections, apply to this Section.
  2. Specifications throughout all Divisions of the Project Manual are directly applicable to this Section, and this Section is directly applicable to them.

1.02SUMMARY

  1. Perform all work required to provide and install vacuum insulated pipe and accessories for distribution of liquid nitrogen from outside tank to indoor freezer room, with supplementary items necessary for proper distribution to final point of use including valves,fittings and vacuum ports.

1.03REFERENCE STANDARDS

  1. The latest published edition of a reference shall be applicable to this Project unless identified by a specific edition date.
  2. All reference amendments adopted prior to the effective date of this Contract shall be applicable to this Project.
  3. All materials, installation and workmanship shall comply with the applicable requirements and standards addressed within the following references:
  4. ANSI B31.3 – Chemical Plant and Petroleum Refining Piping.
  5. ASTM A312 – Welded Pipe.

1.04QUALITY ASSURANCE

  1. Valves: Manufacturer’s name and pressure rating marked on valve body.
  2. Welding Materials and Procedures: Conform to ASME Code and applicable state labor regulations.
  3. Manufacturer Qualifications: Company specializing in manufacturing the products specified in this section with minimum three years documented experience.
  4. Installer Qualifications: Company specializing in performing the work of this section with minimum three years documented experience.

1.05SUBMITTALS

  1. Product Data:Provide data on pipe materials, pipe fittings, valves and accessories. Provide manufacturer’s catalog information.
  2. Record Documents: Record actual locations of valves, etc
  3. Operation and Maintenance Data:

1.06DELIVERY, STORAGE and HANDLING

  1. Accept valves on site in shipping containers with labeling in place. Inspect for damage.
  2. Provide temporary end caps and closures on piping and fittings. Maintain in place until installation.
  3. Protect piping systems from entry of foreign materials by temporary covers, completing sections of the work and isolating parts of completed system.

PART 2 - PRODUCTS

2.01GENERAL

  1. All materials shall meet or exceed all applicable referenced standards, federal, state and local requirements, and conform to codes and ordinances of authorities having jurisdiction.

2.02VACUUM INSULATED PIPE

  1. Manufacturers:
  2. Chart Industries, Inc.
  3. Technifab Products, Inc.
  4. Quality Cryogenics
  5. Approved Equal
  6. The vacuum insulated piping system shall be composed of prefabricated sections of the static vacuum design with a chemical gettering system. The sections must have bayonet end connections for assembly in the field without welding. The manufacturer shall have design bayonet locations and provide a piping drawing for customer approval.
  7. The inner carrier shall be INVAR 36 with 36% nickel alloy for minimal contraction between atmospheric and cryogenic temperatures or 304 stainless with bellows. Pipe ends shall be bayonet joints for joining spools and as use points. Male bayonet shall be INVAR 36.
  8. The vacuum jacket shall be 304 stainless steel in accordance with the ASME Code for Unfired Pressure Vessel, Section VIII for an internal vacuum and external atmospheric pressure with the assembly at ambient temperature. Expansion joints shall not be necessary.
  9. The vacuum annulus inner carrier shall be supported within the jacket by a support system designed to absorb thermal loads on the inner pipe when partially or completely filled with product minimize heat leakage, withstand loadings 1, 2, and 3, listed below during shipping and loading 4 during and after installation.
  10. Three “g” load applied vertical downward.
  11. Three “g” load applied vertical upward.
  12. Two “g” load applied horizontally, longitudinally, or laterally combined with one “g” load vertically downward.
  13. Met Uniform Building Code for Zone 3 seismic requirements when inner line is filled with Trichlorethylene.
  14. The laminar radiation shielding inner line shall be “super insulated” with a minimum of twenty alternate layers of aluminum foil and cryogenic paper.
  15. Each section of the chemical gettering system shall have molecular sieve and a hydrogen converter installed in the vacuum annulus for the purpose of removing the majority of vacuum contaminants. The quantity of sorption pumping materials required for each section shall be determined by the manufacturer.
  16. Each section shall be equipped with a combination evacuation/relief valve port complete with a Hasting DV-6R Vacuum Transducer for monitoring the vacuum level without breaking into the vacuum annulus.
  17. Heat shall be applied during pumping to accelerate outgassing. Minimum temperature shall be 200 degrees Fahrenheit. Sections to be sealed at less than 10 microns.
  18. All manufacturing shall be accomplished through the use of certified welders. Testing of welds includes leak-testing with helium mass spectrometer calibrated to a sensitivity of 1 x 10-9 standard cc/second. A two-day vacuum retention test to verify leak testing and seal off.
  19. Three foot and six foot flexible vacuum jacketed sections to offset horizontally around walls.
  20. All rigid and flexible piping shall be rated for 150 psig maximum.
  21. All points of use drops shall be provided with internal traps.

2.03VALVES

  1. Valves shall be provided for point of use isolation. Each valve shall be ½” vacuum insulated extended stem valve. Valve shall accommodate operating temperatures between -320 degrees to +165 degrees a a maximum operating pressure a 600 PSI CWP.

2.04CRYOVENTS

  1. Heated cryovents shall be provided at the end of each main and at other locations as recommended by the manufacturer.

2.05FILL STATION

  1. Manufacturer shall provide one fill station assembly with manually actuated dead-man switch solenoid valve controlled dispensing system where required in project drawings.

2.06FITTINGS

A.Each point of use outlet shall be provided with male connector to receive freezer hose. Intermediate piping and fittings shall be stainless (304). Each drop may serve from one to four freezers.

PART 3 - EXECUTION

3.01PREPARATION

  1. Visually inspect all components for damage prior to installation. If deep dents are noted, do not install pipe. Contact manufacturer for assistance.
  2. Clean bayonet couplings and O-ring using clean lint free cloth and solvent approved by the manufacturer.
  3. Read vacuum on each section of pipe, using Hastings Vacuum Gauge. Report any vacuum pipe reading higher than 35 microns.

3.02INSTALLATION

  1. Installation shall meet or exceed all applicable federal, state and local requirements, referenced standards and conform to codes and ordinances of authorities having jurisdiction.
  2. Installation shall be in accordance with manufacturer’s published recommendations.
  3. Provide non-conducting dielectric connections wherever joining dissimilar metals.
  4. Rout piping in orderly manner and maintain gradient.
  5. Install piping to conserve building space.
  6. Group piping whenever practical at common elevations.
  7. Install piping to allow for expansion and contraction without stressing pipe, joints, or connected equipment.
  8. Provide clearance for access to valves and fittings.
  9. Refer to manufacturer’s installation instructions for complete installation.

3.03APPLICATION

  1. Install hangers and supports at intervals of 6 to 8 feet and all change in direction points. Use split clamp hanger type supports with appropriate isolation. Piping shall not be able to sway. Refer to specification 20 05 29 Supports and Sleeves.
  2. Point of use drops shall be attached to architectural pipe column or attached to wall with unistrut channel. Coordinate spacing requirements of electrical raceway.

3.04TESTING – DRY NITROGEN

A.After installation of all components, the installer shall pressurize the entire system with dry nitrogen gas to maximize operating pressure. Pressure shall not exceed 1.25 times vacuum insulated pressure rating. There should be no pressure decrease in a four hour period. If the pressure drops in a four hour period, bubble test entire system, starting at supply tank, until the leak is located and repaired. Repeat until the pressure hold test is successful.

3.04TESTING – LIQUID NITROGEN

  1. After dry nitrogen test the manufacturer shall introduce liquid nitrogen into the piping system from a supply tank. The closest point of use valve shall be opened first, until liquid nitrogen begins to issue. Repeat sequence for all points of use through to far point.
  2. The system shall be visually inspected for condensation on vacuum insulated pipe. The manufacturer shall make adjustments as needed to eliminate abnormal frost formation or condensation.

END OF SECTION 43 62 23

The University of Texas / VACUUM INSULATED PIPE
MD AndersonCancerCenter / 436223
MS110210 / 1 of 1