Thermo Scientific 8120 Operating instructions

Model 8120
180 Liter, LN2 Supply Tank
Operating and Maintenance Manual 8008120 Rev. 2
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Thermo Scientific
MANUAL NUMBER 8008120
2 28202 2/12 Removed pressure building kit and references as it is unavailable ccs
-- -- 1/05 Clarified page references in Specifications and the parts list in Operation ccs
1 -- 7/03 Updated information from manufacturer ccs
0 -- 9/96 Manufacturer’s manual deg
REV ECR/ECN DATE DESCRIPTION By
Preface
180 liter LN2 Supply Tank i

Thermo Scientificii 180 liter LN2 Supply Tank
Preface
Important Read this instruction manual. Failure to read, understand and follow the instructions in this manual
may result in damage to the unit, injury to operating personnel, and poor equipment performance. 
Caution All internal adjustments and maintenance must be performed by qualified service personnel. 
Material in this manual is for information purposes only. The contents and the product it describes are subject to
change without notice. Thermo Scientific makes no representations or warranties with respect to this manual. In
no event shall Thermo be held liable for any damages, direct or incidental, arising out of or related to the use of
this manual.
©1996 Thermo Scientific. All rights reserved.

Thermo Scientific 180 liter LN2 Supply Tank iii
Preface
Important operating and/or maintenance instructions. Read the accompanying text carefully.
Potential electrical hazards. Only qualified persons should perform procedures associated with this
symbol.
Equipment being maintained or serviced must be turned off and locked off to prevent possible injury.
Hot surface(s) present which may cause burns to unprotected skin, or to materials which may be
damaged by elevated temperatures.
Marking of electrical and electronic equipment, which applies to electrical and electronic equipment
falling under the Directive 2002/96/EC (WEEE) and the equipment that has been put on the market
after 13 August 2005.
This product is required to comply with the European Union’s Waste Electrical & Electronic
Equipment (WEEE) Directive 2002/96/EC. It is marked with the WEEE symbol. Thermo Scientific
has contracted with one or more recycling/disposal companies in each EU Member State European
Country, and this product should be disposed of or recycled through them. Further information on
Thermo’s compliance with this directive, the recyclers in your country and information on Thermo
products will be available at www.thermofisher.com.
Always use the proper protective equipment (clothing, gloves, goggles, etc.)
Always dissipate extreme cold or heat and wear protective clothing.
Always follow good hygiene practices.
Each individual is responsible for his or her own safety.

Thermo Scientificiv 180 liter LN2 Supply Tank
Preface
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Thermo Scientific 180 liter LN2 Supply Tank v
Preface
MVE has conducted a rigid test program for liquid cylinders, both
internally and through an independent testing laboratory, to verify the
safety of MVE equipment. MVE cylinders are safely designed with the
following features:
(1 An exclusive all stainless steel support system designed to withstand
many years of rugged service.
(2) A stainless steel neck tube that is designed not to break in case of a
minor accident, such as a liquid cylinder being inadvertently tipped
over.
(3) A vacuum maintenance system specifically designed to provide long life
and safety provisions.
(4) Safety relief devices to protect the pressure vessel and vacuum casing,
sized and selected in accordance with CGA Pamphlet S-1.1 “Safety
Relief Devices for Cylinders.” The safety of the inner pressure vessel is
controlled by a pressure relief valve and rupture disc. A reverse
buckling rupture disc protects the vacuum casing from overpressure.
While MVE equipment is designed and built to rigid standards, no piece
of mechanical equipment can ever be made 100% safe. Strict compliance
with proper safety and handling practices are necessary when using a liquid
cylinder or other compressed gas equipment. We recommend that all our
customers reemphasize safety and safe handling practices to all their
employees and customers. While safety features have been designed into
the unit and safe operations are anticipated, it is essential that the user of
these liquid cylinders carefully read to fully understand all WARNINGS,
CAUTIONS and Notes listed in this safety section and enumerated below.
Also read to fully understand the information provided in the Safety
Bulletins for Oxygen and Inert Gases located in Section 19 of this Manual.
Periodic review of the Safety Summary is recommended.
Warning Excess accumulation of oxygen creates an oxygen enriched
atmosphere (defined by the Compressed Gas Association as an oxygen
concentration above 23 percent). In an oxygen enriched atmosphere,
flammable items burn vigorously and could explode. Certain items
considered non-combustible in air may burn rapidly in such an
environment. Keep all organic materials and other flammable substances
away from possible contact with oxygen; particularly oil, grease, kerosene,
cloth, wood, paint, tar, coal dust, and dirt which may contain oil or grease.
DO NOT permit smoking or open flames in any area where oxygen is
stored, handled, or used. Failure to comply with this warning may result in
serious personal injury. 
Safety

Thermo Scientific
Warning Nitrogen and argon vapors in air may dilute the concentration of
oxygen necessary to support or sustain life. Exposure to such an oxygen
deficient atmosphere can lead to unconsciousness and serious injury,
including death. 
Warning The Dura-Cyl/Cryo-Cyl Series, with its stainless steel support
system, is designed, manufactured, and tested to function normally for
many years of service. MVE does not suggest or warrant that it is ever safe
to drop a liquid cylinder or let it fall over in oxygen or any other cryogenic
service. In the event a liquid cylinder is inadvertently dropped, tipped over,
or abused, slowly raise it to its normal vertical position. Immediately open
the vent valve to release any excess pressure in a safe manner. As soon as
possible, remove liquid product from vessel in a safe manner. If the vessel
has been used in oxygen service, purge it with an inert gas (nitrogen). If
damage is evident or suspected, return to MVE prominently marked
“LIQUID CYLINDER DROPPED, INSPECT FOR DAMAGE”. 
Warning Before removing cylinder parts or loosening fittings, completely
empty the liquid cylinder of liquid and release the entire vapor pressure in
a safe manner. External valves and fittings can become extremely cold and
may cause painful burns to personnel unless properly protected. Personnel
must wear protective gloves and eye protection whenever removing parts or
loosening fittings. Failure to do so may result in personal injury because of
the extreme cold and pressure in the cylinder. 
vi 180 liter LN2 Supply Tank
Safety (continued)
Preface

180 liter LN2 Supply Tank viiThermo Scientific
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Cylinder Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Responsibilities When Filling Cylinders . . . . . . . . . . . . . . . . . . . . . . .1-3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Pressure Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Filling Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Liquid Withdrawal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Filling Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Filling Weight Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Liquid Withdrawal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Operating Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Loss of Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Service and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Changing Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Fittings and Decals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Recommended Inner Vessel Purging . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Changing the Service Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
Cryo-Cyl in Liquid Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
Changing Operating Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
Level Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
Rebuilding the Operational Valves . . . . . . . . . . . . . . . . . . . . . . . . . . .6-6
Disassembly and Repair Procedure . . . . . . . . . . . . . . . . . . . . . . . . .6-6
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6

viii 180 liter LN2 Supply Tank Thermo Scientific
Safety Bulletin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Oxygen Deficient Atmospheres . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2
Nitrogen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
Table of Contents
Section 7
Section 8

180 liter LN2 Supply Tank 1-1Thermo Scientific
Section 1 Introduction
The MVE, Inc. (MVE) Cryo-Cyl Series cryogenic liquid cylinders (Figure
A) are double walled, vacuum and multi-layer insulated cylinders designed
for the transportation and storage of liquefied gases. These liquid cylinders
are designed for the transportation and storage of cryogenic products
which can be used as either gas or liquid. All of the Cryo-Cyl Series liquid
cylinders can be used for liquid argon, liquid nitrogen, and liquid oxygen.
The Cryo-Cyl Series liquid cylinders have model distinctions for low
pressure liquid withdrawal (LP). See Specifications for more detail.
The Cryo-Cyl Series liquid cylinders also have capacity distinctions; the
number after their name that designates net capacity in liters (the Cryo-
Cyl 180 indicates 180 liters capacity). See Specifications for more detail.
The portable liquid cylinders provide a reliable, convenient, and
economical method for the transportation and delivery of liquefied gas
products. They are primarily used as a self-contained gas supply. They can
be used with a variety of accessories such as the M-45 Manifold to provide
larger gas storage capacities.
Figure A. Cryogenic Liquid Cylinders