Page 15 - Praxair - Specialty Gases and Equipment Reference Guide

Liquid Helium Containers

High Performance
Liquid Helium Dewars
Praxair dewars make handling liquid
helium easier because they have
several features developed and
patented specifically for this special
purpose.
■ Multi-layer insulation to reduce
evaporation losses.
■ Cooled shields to simplify your
operation and help reduce costs.
Section A – Cylinders and Containers
Escaping helium vapor is used to
cool the system, avoiding the need
for cooling with nitrogen and the
subsequent cost and potentially LT-100 LT-250 LT-500
harmful release in an enclosed area.
■ Light weight for easier lifting
and moving. LT-60 LT-100 LT-250 LT-500
■ Rugged, all-welded construction Capacity (liters max) 60 100 250 500
for increased performance life of Diameter (in/cm) 24/61 24/61 32/81.3 42/106.7
the multi-layer insulation and Height (in/cm) 51/127.3 59/147.9 67/171.1 70/179.3
shield system. Tare Weight (lb/kg) 165/75 200/91 335/152 540/245
■ Large-diameter neck tubes to Neck Diameter (in/cm) 1.45/3.7 1.45/3.7 2.4/6.1 2.9/7.4
allow for better structural integrity NER (Static loss max. per day) 1.75% 1.25% 1% .75%
and for larger-sized liquid helium
withdrawal apparatus.
■ Non-magnetic dewars available for
use with Magnetic Resonance Pressure Gauge
Imaging (MRI) units.
Withdrawal/Fill Ball Valve
■ Absolute relief valve to extend use
of dewars to airborne as well as Vent/Pressurization Valve
surface shipments. Multilayer Superinsulation
■ Complete Society of Automotive
Engineers (SAE) range of dewars
available to meet all known liquid
helium volume needs.
Vapor Cooled Shields

Liquid Helium Reservoir
Vacuum Jacket

LT-250 Liquid Helium
Dewar Details

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