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Since 1966 CHART (formerly MVE)has specialized in the design andfabrication of custom cryogenic pipingfor liquid nitrogen, oxygen, argon,helium, and hydrogen in pipe sizesranging from 1/4" through 8".

CHART will continue, as always, toprovide the finest available VacuumInsulated Pipe (VIP), built to customerspecifications.

Configuration (Size Limitations)The configuration of a Built to Ordersection of VIP is restricted only byshipping and installation constraints.Typically, installation conditionsimpose more limitations than doshipping constraints. For shippingpurposes, all pipe sections should fallwithin an 8 x 8x 40 foot envelope.

Approach to system design andspecifications...to define your systemneeds.• Determine the basic routing of the

liquid nitrogen system. Chart willprovide any needed assistance.

• Develop an isometric sketch orplan and elevation views of thevacuum insulated pipe (VIP) layout.This step is necessary to determinethe exact components required.

• Size the pipe and components bydetermining expected current andfuture flow rates. CHART can assistonce the flow requirements areknown. Plan now for potentialsystem expansion.

• Be sure to note wall penetrationsso that couplings are positionedproperly for ease of assembly.

• Installation restrictions for length ofsections should also be noted.

Rigid vs. Flexible VIPRigid VIP has lower heat leak and is lessexpensive than flexible VIP.The prudent use of flexible VIPsections...• Minimizes alignment problems during

installation and operation.• Eliminates the necessity of precise

field measurement.• Provides simple means for disassembly

of system for service or modification.

Valves used at the end of a run or dropare normally extended packing cryogenicvalves. Vacuum jacketed valves are moreexpensive, and should be limited to in-line service.

Features of a typical system include...• Bayonet couplings for ease of

installation.• Equivalent flow flexible sections for

changes of direction and elevation.• Vacuum jacketed in-line valves to

insolate branch runs for selectiveshutdowns.

• Capped bayonet couplings for futureexpansion.

• Flexible drops with internal trapped endsfor efficient operation and rapidresponse to cycling equipment.

• CryoVent at end of run to keep mainheader cold and liquid readily availableto use points.

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Trap EndSingle drop use points also requiretrap ends. While Figure D-4 shows asuitable trap end installation thepreferred method is the CHART TrapEnd as illustrated in Figure D-5.This is less expensive and requiresless space than that illustrated inFigure D-4.

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CHART shall provide anchor points of double wallreinforcement if required.NOTE: Welding directly tojacket wall is notrecommended.

C. DrawingsCHART shall submit a constructiondrawing for customer approval.Drawing to have sufficient dimensionaland informational data for customerinterpretation.

D. Design Criteria

1. Inner CarrierThe design and manufacturing of theVIP shall be in accordance withANSI B31.3 - Chemical Plant andPetroleum Refining Piping and latestapplicable addenda for 150 PSIG.a. Material shall be “INVAR 36” or

304 stainless steel, ASTM A312 pipe, welded or seamless.

b. Flow Rate shall be as specified on drawing(s).

c. Size shall be as specified on drawing(s). Contact CHART for assistance.

d. Pipe Ends shall be CHARTbayonet joints for joining spools andas specified ondrawing(s) at use p o i n t ( s ) .e. Internal Bellows - Required when

stainless steel inner carrier pipe is used. This eliminates the need for jacket expansion joints. CHARTinstalls this item to compensatefor the differential rates of expansion between inner carrier pipe and outer jacket.

A. ScopeThis specification describes therequirements for vacuum insulatedpiping (VIP) line system for transferof__________________________.(Specify) System layout and detailsas shown on customer supplieddrawings.

NOTE: Contact CHART forassistance in system design.

B. Description of SystemThe vacuum insulated pipingsystem shall be composed ofprefabricated sections or “spools”of the static vacuum design with achemical gettering system. Thespools shall have CHART bayonetend connections for assembly inthe field without welding. (Fieldweld assemblies upon request).Unless specified on the submitteddrawings, CHART shall designatebayonet locations for customerapproval. For consideration ofprice, installation, and shipping, nospool will exceed 40 feet in lengthor 8'0" in width.

1. FlexibilityPrudent use of flex hose shall beexercised because of higher heatinfluxation. If needed for astainless steel bellows designexternal installation, it may beused in a lateral-offset manner toeliminate overstress conditions.

2. Supports/Hangers (supplied byothers)a. INVAR inner - any type.b. Stainless steel inner (with

internal bellows) - any typec. Stainless steel inner (with

external bellows) - must be a type which allows axial movement.

CHART shall provide anchor points of double wallreinforcement if required.NOTE: Welding directly tojacket wall is notrecommended.

C. DrawingsCHART shall submit a constructiondrawing for customer approval.Drawing to have sufficient dimensionaland informational data for customerinterpretation.

D. Design Criteria

1. Inner CarrierThe design and manufacturing of theVIP shall be in accordance withANSI B31.3 - Chemical Plant andPetroleum Refining Piping and latestapplicable addenda for 150 PSIG.a. Material shall be “INVAR 36” or

304 stainless steel, ASTM A312 pipe, welded or seamless.

b. Flow Rate shall be as specified on drawing(s).

c. Size shall be as specified on drawing(s). Contact CHART for assistance.

d. Pipe Ends shall be CHARTbayonet joints for joining spools andas specified ondrawing(s) at use p o i n t ( s ) .e. Internal Bellows - Required when

stainless steel inner carrier pipe is used. This eliminates the need for jacket expansion joints. CHARTinstalls this item to compensatefor the differential rates of expansion between inner carrier pipe and outer jacket.

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3. Chemical Gettering SystemEach spool shall have molecularsieve and a hydrogen converterinstalled in a vacuum annulus forthe purpose of removing themajority of vacuum contaminantsreleased by outgassing. Thequantity of sorption pumpingmaterials required for each spoolsection shall be determined byCHART.

4. Evacuation PortEach spool shall be equippedwith a CHART combinationevacuation/relief valve portcomplete with a Hastings DV-6RVacuum Transducer formonitoring the vacuum annulus.a. Location shall be in an

approved location or approximately centered on each spool with consideration to personnel safety,accessibility, and non- interference with other equipment.

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Chart designs and manufactures VacuumInsulated Pipe (VIP) in accordance withthe ANSI Code, Section B31.3, ChemicalPlant and Petroleum Refining Piping.

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Receiving Inspection• Exercise care in unloading and

uncrating.• Visually inspect all components

for physical damage. If damage isnoted...

• Immediately initiate freight claim with carrier.

• Notify your CHARTrepresentative or the factory for disposition/assistance.

• Read vacuum on each section ofpipe, using Hastings VacuumGauge, Model TV-4A. Report toCHART any vacuum pipe readinghigher than 35 microns.

• Clean bayonet couplings andO-ring using clean, lint-free clothand approved solvent. Inspectbayonet for damage. If deepscratches or dents are noted,do not install bayonet couplings.Contact CHART for assistance.

Hanging/Securing Pipe• Install hangers and supports at

intervals of 6 to 10 feet, and at allchange of direction points.

• Use J-hangers, U-bolts, splitclamps or roller type supports.Exact type of hanger is determinedby type of installation.

• Select first section to be installed(usually at one end of the system)and place loosely in supports.

• Place adjacent pipe section insupports.

• Check alignment before engagingbayonets.

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• Cooldown test introduce liquidnitrogen into piping system fromsupply tank.

• Open valve at use point farthestfrom supply tank. Allow nitrogengas to flow until liquid nitrogenbegins to issue from valve.Close valve.

• Repeat procedure at all usepoints until entire system is cooledto operating temperature.

• Visually inspect entire VIP systemfor condensation or frost formation.Frost at non-vacuum jacketedsegments is normal. Contact CHARTfor assistance if abnormal frostformation or condensation is noted.

Trouble Shooting GuideAlthough rare, it is possible to have a problem with any vacuum insulatedcomponent. If a potential problem is noted, please contact CHART for assistance.The following trouble shooting guide is offered to facilitate evaluation.

Check vacuum andvisually inspect fordamageConsult CHART

If excessive/persistent,note temperature,humidity, consult CHART

Check vacuumConsult CHART

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CryoVent DeviceThis fully automatic device utilizes acompletely mechanical float system tomaintain liquid in the line. The stainlesssteel inner vessel is vacuum jacketedand super insulated. Bayonet mountingallows the unit to be removed andreinstalled at the end of an expandedsystem.

Phase SeparatorsCHART solves the problem of highpressure liquid nitrogen discharge at usepoints with phase separators in a varietyof configurations. By venting the excessgas generated from depressurizing liquidnitrogen, the phase separator provideslow pressure, high quality liquid.High and low level sensors governautomatic filling and incorporate anaudible and visual alarm to notifyoperators of supply or equipmentproblems. An optional adjustable ventregulator provides optimum use pointpressure up to 10 PSIG.Three phase separator configurationsare available: a bottom outlet unit foroverhead mounting; a multiple outletoverhead model with four dischargelines; and a floor level model. All phaseseparators features stainless steelconstruction and low evaporation rates.

SubcoolerSystems operating at high pressure andhigh volume users will benefit from theCHART subcooler that lowers thecryogenic liquid’s temperature prior toliquid withdrawal. A cryogenic bathsubcools incoming liquid for distributionin the system. A subcooler isadvantageous in systems that requireelevation changes and continuous liquidwithdrawal at use points.

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If sweat or frost does occur on asection and does not disappear witha change to lower humidity andtemperature consult the factory forproper procedure to follow.NOTE: On each section of VIP, a

CHART label is located by theseal-off device. This labelcontains the “customer name”,“VS#” (vacuum sectionnumber), and the ordernumber the line was builtunder; please furnish thisinformation wheneverconsulting the factory aboutthis system.Any time a section orcomponent is returned to thefactory a customer returnauthorization number mustbe obtained.

Frost or sweat formation may occur:1. At all uninsulated end use

t e r m i n a t i o n s .2. At bayonet flanges, given certain

temperature and humidityc o n d i t i o n s .

3. On pipe sections depending onvacuum level, temperature, orhumidity conditions.

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CHART Industries, Inc.Cryogenic Components Division, 407 Seventh Street Northwest, New Prague, Minnesota 56071-1000

Tel: (877) 428-3319 (US), (612) 758-8598 (Worldwide), Fax: (612) 758-8590CHART Europe Gmbh: +49(0)212-700 570, Fax: +49 (0)212-700 577

CHART Asia Pacific: 65-838-5209, Fax: 65-235-3680

Website: www.chart-ind.com; E-mail vjpipe@chart-ind.com

Form 2278C PN 10583617 6/01

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