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Thermo Scientific 8120, Руководство по эксплуатации и техническому обслуживанию

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Section 6  

Service and Maintenance

This section contains the information regarding the liquid cylinder care
and maintenance. It includes the particular maintenance procedures for
changes to the operating pressure, service pressure and liquid service
changes. When performing a procedure that is described in this section,
refer to the Operation section for a components item number and
location.

Before implementing any procedure described in this section, it is
recommended that the Safety section and Product Safety Bulletins be read
and fully understood.

Always keep cylinders clean and free from grease and oil. 

When repairing containers, use only parts which are considered compatible
with liquid to be used and which have been properly cleaned for this
specific liquid service.

Do not use regulators, fittings, or hoses which were previous used in a
compressed air service. Use only compatible sealants or Teflon tape on the
threaded fittings. All new joints should be leak tested with an specifically
compatible leak test solution.

Caution

Before conducting maintenance or replacing parts on a cylinder,

release container pressure in a safe manner. Replacement of certain cylinder
parts may require that the container contents be completely emptied. 

The Cryo-Cyl Series liquid cylinders are designed to hold any of the gas
products specified. They can easily be modified to work as well with
nitrogen as oxygen. The fittings and decals need to be changed and the
inner vessel needs to be purged.

If a cylinder is changed from inert (argon or nitrogen) to CO

2

service, the

relief valve must be changed to a CO

2

relief valve.

Caution

Once a cylinder is used in CO

2

service, it can not be used for

other gas products, especially oxygen or nitrous oxide.

Caution 

Whenever converting a Nitrogen or Argon cylinder to Oxygen

use, inspect the cylinder to assure cleanliness. 

180 liter LN2 Supply Tank        6-1

Thermo Scientific

Safety

Cleaning

Changing Service

Содержание 8120

Страница 1: ...Model 8120 180 Liter LN2 Supply Tank Operating and Maintenance Manual 8008120 Rev 2 Visit us online to register your warranty www thermoscientific com labwarranty ...

Страница 2: ... 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 ...

Страница 3: ...ernal 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 r...

Страница 4: ...EEE 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 recy...

Страница 5: ...e 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...

Страница 6: ...ary 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...

Страница 7: ...tely 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 com...

Страница 8: ...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 Operation...

Страница 9: ...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 ...

Страница 10: ...en 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 relia...

Страница 11: ...y The vacuum space is protected from over pressurization by the use of a reverse buckling rupture disc The outer vacuum jacket of the liquid cylinder contains an internal vaporizer which converts the cold liquid to gas The internal pressure building system allows for immediate use of the cylinder by automatically building pressure to the preset operating pressure and maintaining it there during ga...

Страница 12: ...ator at the gas use connection The operating pressure can be increased to the pressure control valve setting if necessary by changing the regulator These MVE liquid cylinders provide a complete self contained liquid or gas supply system for industrial laboratory or hospital use MVE states below the responsibilities of the filler of any cryogenic liquid cylinder 1 The cylinder must be in a safe con...

Страница 13: ......

Страница 14: ...enting of product from the pressure relief valve Internal pressure building and vaporization systems permit a continuous flow of gas without need for an external vaporizer The pressure control regulator automatically maintains working pressure with minimum product loss Cylinders can be used singularly or can be manifolded to provide a continuous gas supply The performance of a liquid cylinder can ...

Страница 15: ...poration Rate Nitrogen 1 5 Oxygen or Argon 1 0 Gross Capacity liters 196 Storage Capacity Liquid liters 185 Liquid Level Gauge Float Construction Material Stainless Pressure Building Regulator psig 0 25 BAR 0 1 7 Finish Stainless Base Construction Stainless Steel Footring Notes 1 At lower relief valve settings weights and capacities are higher See Fill Weight Table in Section 4 2 Peaks of up to 4X...

Страница 16: ... Fill Liquid Valve blue Gas Use Valve green Vent Valve silver Pressure Building Valve green The schematic illustrations and Figure C show how the plumbing circuitry operates for the four major models of liquid cylinders It is important that the operators be familiar with the plumbing control valves and their functions PRESS BUILD CO 2 6 8 9 4 Figure C Plumbing Cryo Cyl LP Item Plumbing Controls an...

Страница 17: ... If damage is detected e g serious dents loose fittings etc remove it from service and repair the unit as soon as possible All MVE liquid cylinders are tested for performance with low purity liquid nitrogen For this reason liquid cylinders intended for use in another service should be thoroughly purged with the applicable gas prior to filling When filling a liquid cylinder with a cryogenic liquid ...

Страница 18: ...alve when the user s vessel has been filled To prevent contamination when the cylinder has been emptied all valves should be closed To minimize flash off and spillage use a phase separator on the end of the transfer line Normal liquid withdrawal operations are performed at lower pressure approximately 22 psig to reduce flash off losses and splashing Transfer of liquid at higher pressures can lead ...

Страница 19: ......

Страница 20: ...re of 22 psig 1 5 BAR to allow for transfer into vented cryogenic dewars or equipment The pressure is maintained in the liquid cylinder through its normal heat leak of the cylinder The pressure will rise in the closed cylinder as its liquid contents boil off It is normal for the pressure to reach the relief valve setting of 22 psi 1 5 BAR and vent slowly into the atmosphere The transportation of t...

Страница 21: ... 1 Record the new weight The difference between this weight and the initial weight is the weight of the transfer hose 4 To determine the total filling weight add the tare weight of the cylinder the hose weight and the proper filling weight from the table The table indicates the product across the top and the liquid cylinder model down the side Connect the two columns to find the proper weight Exam...

Страница 22: ... pressure should be as low as possible and a phase separator should be used to eliminate splashing and hose whip 1 Connect the transfer hose to the liquid valve Item 1 of the cylinder 2 Connect or place the other end of the hose onto the inlet of the cryogenic equipment that will receive liquid Atmospheric dewars are filled with a phase separator mounted to the open end of the hose 3 Refer to the ...

Страница 23: ...e Disc 5 38 1494 5 1 Warranty Seal 7 20 1516 9 1 1 Pressure Gauge 0 100 psi 8 18 1001 2 1 1 Relief Valve 22 psi 9 12 1292 2 1 Cross 1 4 FPT 10 12 1046 2 1 Street Elbow 1 4 MPT 11 19 1162 2 1 1 Rupture Disc 200 psi 12 38 3059 9 1 Decal Liquid Fill 13 38 3061 9 1 Decal Vent 14 1 1 Level Gauge see pg 6 3 15 23 0009 4 1 1 O ring silicon 16 54 1048 6 1 1 Level Gauge Protector Yellow 17 29 1050 1 3 Bolt...

Страница 24: ...arm inner vessel Warm cylinders will build pressure fast after filling and vent off the excess A liquid cylinder that has been filled and not used will build pressure and vent the excess off The higher the pressure was in the storage tank at the time of filling the faster the liquid cylinder will vent off Excessive pressure rise can also be an indication of vacuum loss The Cryo Cyl Series liquid c...

Страница 25: ...e the cylin der should be equipped with low pressure relief valve and regulator Normal pressure rise should not be more than 50 psi 3 4 BAR per day If the cylinder is filled past the vent trycock or past the DOT specified fill weight the pressure may rise rapidly after a fill This can be accompanied by cold or frost occurring evenly over the cylinder surface Refer to the trouble shooting section o...

Страница 26: ... than optimum for liquid with drawal Possible dry ice blocks have formed in system This is normal Ice may remain for days after a fill or heavy use Check for gas escaping from under sight gauge Refer to Service Maintenance section for repair This is normal This is accompanied by high rate of pressure rise or high loss rate Call MVE for return instructions Call MVE for evaluation or repair return i...

Страница 27: ......

Страница 28: ...vice Use only compatible sealants or Teflon tape on the threaded fittings All new joints should be leak tested with an specifically compatible leak test solution Caution Before conducting maintenance or replacing parts on a cylinder release container pressure in a safe manner Replacement of certain cylinder parts may require that the container contents be completely emptied The Cryo Cyl Series liq...

Страница 29: ...uum and gas purge lines The container is now ready for filling It is very important that the proper fittings for the specific gas product being transported are installed on the liquid cylinder The Compressed Gas Association regulates the fitting design so that equipment compatibility is based on gas product This keeps from having a nitrogen tank attached to a hospital s oxygen supply DO NOT use fi...

Страница 30: ...el If the liquid cylinder is in CO2 service the vessel must be emptied of product 2 Remove the relief valve DO NOT attempt to repair or reset the relief valve 3 Remove the metal identification tag 4 Install the new identification tag and relief valve use oxygen compatible thread sealant or teflon tape 5 Pressurize the container and leak test with oxygen compatible snoop solution Changing the Servi...

Страница 31: ...float and spring that approximates the amount of product in the container The design of this gauge makes it possible to use the same float and spring for nitrogen oxygen and argon However the liquid level decal must be changed for each product The decals are marked N for nitrogen O for oxygen and A for argon 6 4 180 liter LN2 Supply Tank Thermo Scientific Section 6 Service and Maintenance Changing...

Страница 32: ...he spring retainer Item 8 and adjust the spring up and down the float rod until the indicator hangs freely in the right location Tighten the spring retainer d Replace the O Ring Gasket Item 7 e Insert the float and sight gauge assembly into the container Make sure that it engages in the float guide located approximately 21 inches into the container f Tighten the sight gauge to 1 4 turn past hand t...

Страница 33: ...orce after valve is fully open 2 Using a screwdriver remove handwheel screw and washer Items 3 14 by turning counterclockwise to allow removal of spring retainer washer spring seal washer seal handwheel and bonnet washers Items 1 2 4 7 8 10 and 13 Discard these parts 3 Using a large adjustable wrench to hold valve body remove and discard bonnet Item 5 by turning counterclockwise with a 15 16 socke...

Страница 34: ...free of burrs or raised edges and top of bonnet must be absolutely flat to provide an effective seal with bonnet gasket washer Item 7 6 Install bonnet washer Item 7 over stem Item 6 on bonnet 7 Place handwheel Item 1 over stem and on bonnet 8 Install seal Item 10 over stem into recess of handwheel 9 Install seal washer Item 13 over seal at the bottom of handwheel recess as shown 10 With the flat s...

Страница 35: ...rt Number 1 Handwheel 1 All parts are included in Valve Repair Kit P N 97 1575 9 except Item 11 which is not available as a repair part 2 Spring Retainer 1 3 Screw 1 4 Spring 1 5 Bonnet 1 6 Stem 1 7 Bonnet Washer 2 8 Washer 1 9 Bushing 1 10 Seal 1 11 Body and Tube 1 12 Seat Disc Nipple Asm 1 13 Seal Washer 1 14 Washer 1 15 Gasket 1 Figure I Exploded Valve Parts ...

Страница 36: ...treme heat or fire and exposure to most adverse weather conditions earthquakes tornados etc As a rule of thumb whenever a container is suspected of abnormal operation or has sustained actual damage good safety practices must be followed In the event of known or suspected container vacuum problems even if an extraordinary circumstance such as those noted above has not occurred do not continue to us...

Страница 37: ...a state of euphoria leaving the victim with a false sense of security and well being Human exposure to atmospheres containing 12 or less oxygen leads to rapid unconsciousness Unconsciousness can occur rapidly rendering the user essentially helpless This can occur if the condition is reached by an immediate change of environment or through the gradual depletion of oxygen Most individuals working in...

Страница 38: ...athing apparatus Unconsciousness and death may occur with virtually no warning if the oxygen concentration is below approximately 8 Contact with cold nitrogen or argon liquid can cause cryogenic extreme low temperature burns and freeze body tissue Persons suffering from lack of oxygen should be immediately moved to areas with normal atmospheres Self contained breathing apparatus may be required to...

Страница 39: ......

Страница 40: ...ther the equipment or to the component part beyond the original warranty period The Technical Services Department must give prior approval for return of any components or equipment At Thermo s option all non conforming parts must be returned to Thermo postage paid and replacement parts are shipped FOB destination THIS WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES WHETHER WRITTEN ORAL O...

Страница 41: ......

Страница 42: ...Thermo Fisher Scientific 401 Millcreek Road Marietta Ohio 45750 United States www thermofisher com ...

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