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Liquid Helium (LHe) Dewar of 1000 L Nominal Capacity

  • Overview
  • Quick View Leaflet
  • Detail Technical Brochure
  • Application Procedure

Liquid Helium (LHe) Dewar of 1000 L Nominal Capacity

1000L Liquid Helium receiver Dewar

Overview

A Liquid Helium (LHe) Dewar is a critical component of any helium liquefaction system. LHe Dewar is a double walled vessel & LHe is stored in the inner vessel. A Liquid Helium (LHe) Dewar of 1000 L nominal capacity having a net evaporation rate (NER) of ≈ 1% per day. Because of very low latent heat of LHe, control of heat in-leak into LHe is very critical, in 1000L LHe Dewar allowable heat in-leak to LHe by all mean (Conduction, Convection and Radiation) is just 0.3 watts. High leak tight and special arrangements are required for long term vacuum retention of the Dewar. Liquid Helium (LHe) Dewar is used in various helium liquefaction systems for storage and distribution of LHe.

1000L Liquid He Dewar Coupled with Helium Liquefier Cold Box

Liquid Helium (LHe) Dewar of 1000 L Nominal Capacity

1000L Liquid Helium receiver Dewa

Liquid Helium (LHe) Dewar of 1000 L Nominal Capacity

1000L Liquid He Dewar Coupled with Helium Liquefier Cold Box

 

 

Quick View Leaflet

A Liquid Helium (LHe) Dewar is a critical component of any helium liquefaction system. LHe Dewar is a double walled vessel & LHe is stored in the inner vessel. A Liquid Helium (LHe) Dewar of 1000 L nominal capacity having a net evaporation rate (NER) of ≈ 1% per day. Because of very low latent heat of LHe, control of heat in-leak into LHe is very critical, in 1000L LHe Dewar allowable heat in-leak to LHe by all mean (Conduction, Convection and Radiation) is just 0.3 watts. High leak tight and special arrangements are required for long term vacuum retention of the Dewar. Liquid Helium (LHe) Dewar is used in various helium liquefaction systems for storage and distribution of LHe.

 SPECIFICATIONS

Gross/ net capacity

1054/ 1000 Litres

Weight (Empty)

Approx. 684 Kg

Material of construction

SS 304L

Normal evaporation rate

≈ 1% per day

Operating pressure

Shell side (1.0 bara), Jacket side (full vacuum)

Design pressure

Shell side (2 bar g), Jacket side (full vacuum)

Outside overall height

Approx. 1890 mm

Vent connection

DN 15 with DN15 ball valve

Level sensor

3/8" and 1000 mm sensing length superconducting liquid level sensor

Heaters

1kW heater

Ball valves

Cryogenic ball valves: for vent port (1/2"), for flow measurement (1/4")

Flow meter

Rotameter0-10 LPM

Pressure gauge

-30 to 15in Hg

Pressure building

Electric pressure builder (220V, 1 Phase)

Safety relief valves

One in G10 tube (15 psi) and two between G10 tube and neck (20 and 25 psi)


Liquid Helium (LHe) Dewar of 1000 L Nominal Capacity

1000L Liquid Helium receiver Dewa

Detail Technical Brochure

A Liquid Helium (LHe) Dewar is a critical component of any helium liquefaction system. LHe Dewar is a double walled vessel & LHe is stored in the inner vessel. A Liquid Helium (LHe) Dewar of 1000 L nominal capacity having a net evaporation rate (NER) of ≈ 1% per day. Because of very low latent heat of LHe, control of heat in-leak into LHe is very critical, in 1000L LHe Dewar allowable heat in-leak to LHe by all mean (Conduction, Convection and Radiation) is just 0.3 watts. High leak tight and special arrangements are required for long term vacuum retention of the Dewar.

Liquid Helium (LHe) Dewar of 1000 L Nominal Capacity

1000L Liquid He Dewar Coupled with Helium Liquefier Cold Box

APPLICATIONS

  • Liquid Helium (LHe) Dewar is used in various helium liquefaction systems for storage and distribution of LHe. LHe is required to cool superconducting magnets, super conducting RF cavities, etc.

ADVANTAGES

  • Liquid Helium (LHe) Dewar having low net evaporation rate (NER) ≈ 1% per day.

WORKING PRINCIPLE

A liquid helium (LHe) receiver vessel is a double walled vessel. LHe is stored in the inner vessel. Annular space between the outer and inner vessels is maintained under high vacuum due to initial evacuation and cryo-pumping at cold conditions. Multilayer super insulation and thermal shields are used between the inner and outer vessels. It is used in helium liquefaction systems for storage and distribution of LHe.

SPECIFICATIONS

Gross/ net capacity

1054/ 1000 Litres

Weight (Empty)

Approx. 684 Kg

Material of construction

SS 304L

Normal evaporation rate

≈ 1% per day

Operating pressure

Shell side (1.0 bara), Jacket side (full vacuum)

Design pressure

Shell side (2 bar g), Jacket side (full vacuum)

Outside overall height

Approx. 1890 mm

Vent connection

DN 15 with DN15 ball valve

Level sensor

3/8" and 1000 mm sensing length superconducting liquid level sensor

Maximum transfer line OD

25 mm

Heaters

1kW heater

Ball valves

Cryogenic ball valves: for vent port (1/2"), for flow measurement (1/4")

Flow meter

Rotameter0-10 LPM

Pressure gauge

-30 to 15in Hg

Caster wheels

4 No's Outboard wheel configuration with pedal Lock. Casters mounted on round base with fork lift provision.

Pressure building

Electric pressure builder (220V, 1 Phase)

Safety relief valves

One in G10 tube (15 psi) and two between G10 tube and neck (20 and 25 psi)

Vacuum port on outer vessel

1" Vacuum pump out port with removable plug for evacuation and safety of outer vessel.

INFRASTRUCTURE REQUIRED

  • SS pressure vessel manufacturing facilities with high bay area and overhead crane.
  • TIG welding and SS-Cu brazing facilities.
  • MSLD facility.
  • Super-insulation wrapping facility inside a moisture free clean room, expertise of manufacturing cryogenic pressure vessels/ pipings.
  • 1000 square feet space is required for assembly, testing & installation of the LHe Dewar.

MATERIAL AVAILABILITY

  • Most of the components are available within the country and some components need to be imported through local agents.

MANPOWER

  • A mechanical engineer & 2 trained technicians will be required for the development of this Liquid Helium (LHe) Dewar.

Who Should apply


Interested parties with Engineering & Scientific knowledge, good financial background and adequate experience of products manufacturing & fabrication with technical capability in the area of interested technology and having or interested in setting –up facilities for production would be preferred.


How to apply

Send your Technology Transfer Application form duly filled and signed alongwith a Demand Draft/Bankers cheque of Rs. 500/- (for Indian entities) or US $50/- (for foreign entities) drawn in favour of “Accounts Officer, BARC” as application processing fee on following address: 

Head, Technology Transfer and Collaboration Division 
Bhabha Atomic Research Centre,
Trombay, Mumbai – 400 085, India.

Fax : +91-22-25505151


Note:Applications without processing fee as applicable above of Rs. 500/- or US $50/- for each technology will not be considered.


Click here for Technology Transfer Application Form

Contact Us

Head, 
Technology Transfer and Collaboration Division
Bhabha Atomic Research Centre,
Trombay, Mumbai 400 085.

Fax : 091-022- 25505151
Email : technology@barc.gov.in

How to apply

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