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.

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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Our staff can supply technical information about proper setup, operation or

troubleshooting of your equipment. We can fill your needs for spare or replacement parts or

provide you with on-site service. We can also provide you with a quotation on our Extended

Warranty for your Thermo Scientific products.

Whatever Thermo Scientific products you need or use, we will be happy to discuss your

applications. If you are experiencing technical problems, working together, we will help you

locate the problem and, chances are, correct it yourself...over the telephone without a service

call.

When more extensive service is necessary, we will assist you with direct factory trained

technicians or a qualified service organization for on-the-spot repair. If your service need is

covered by the warranty, we will arrange for the unit to be repaired at our expense and to your

satisfaction.

Regardless of your needs, our professional telephone technicians are available to assist you

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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

Table of contents

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