Specification No . 830-4for

28,000 GALLON LIQUID HYDROGEN DEWARFOR

CTL III, MODULE 4, MODIFICATION FOR J- 2at

PROPULSION FIELD LABORATORYSANTA SUSANA, CALIFORNIA

R O C K E T D Y N EA Division of North American Aviation, Inc .6633 Canoga Ave ., Canoga Park, California

Facilities Engineering , Department 583

Approvals :

0010-01

/941 L . SkogstadChief Faci li ties Engineer

I J. J. Hart'Group LeaderD/596-173

7

15 January 1962

BNA0521904 5

HDMSt00008099

Specification No. 83o-!a

28,000 GALLON LIQUID HYDROGEN DAR

1. SCOPE OF WORK

1.1 The Builder shall furnish all labor, materials, tools and equipment,

and shall perform all operations required to design and complete thehorizontal 28,000 Gallon Liquid Hydrogen Dewar is accordance with this

specification and the drawings listed in Paragraph 2 .

2. APPLICABLE DRAWINGS

2.1 The following drawings shall form a part of these specifications :

DRAWING NO . TITLE REP. NO .DATE DRAWNOR REVISED

830-M1 (YTL III, Mod, la, 28,000 Gallon t 2Vessel .- Plan and Section

0 10-13-61

830-M2 CTL III, Mod. 1, 28,000 Gallon LH 2Vessel - Details

0 10-13-61

830-M3 CTL III, Mod. lag 289000 Gallon LH2Vessel - Exchanger Plan & Sections

0 10-13-61

3 . WORK NOT INCLUDED IN THIS SPECIFICATION

34 Vessel foundations 0

b . CODES AND SPECIFICATIONS

1a.1 The latest editions of the following codes andjspecifications, withtheir current revisionsy shall form a part of this specification :

1 .1.1 ASME Boiler and Pressure Vessel Code , Sections VIII and IX .

)x.1.2 ASTM Standards, Part 1, Ferrous Metals" 0

b.1.3 ASTM Standards, Part II, "Non-Ferrous Metals" .

ta.l.t California Administrative Code, Title 8, General Industry Safety Orders .

b.iS Electrical Safety Orders , Department of Industrial Relations , State ofCalifornia.

11.1.6 American Standard Code for Pressure Piping ASA B31,1 .

28,000 GALLON LIQUID HYDROGEN DEWAR

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Specification No. 830-4

5. DESIGN CALCULATIONS AND SHOP DRAWING S

5.1 The Builder shall prepare and submit four copies of design calculationsrequired to support design of the 28,000 Gallon Liquid Hydrogen Dewar.

5.1 .1 Design calculations shall be submitted for approval within 15 .calendardays after award of Contract .

5.1.2 The following certified information in addition to the design calculationsshall be submitted within 15 calendar days after award of Contract.

5.1.2 .1 A dimensional outline drawing of the vessel assembly showing anchorbolt hole sizes and locations, maximum load on each support,location and dimensions of all appurtenances and electrical powerrequirement for normal vessel operation . _

5.2 The Builder shall prepare shop drawings of the vessel in accordancewith Article VIII, Paragraph 6, of the Fixed Price Contract .

5.2 .1 Four copies of shop drawings shall be submitted within 30 days afteraward of Contract .

5.2 .2 Shop drawings shall show dimensions, tolerances, materials , fabrica-tion methods, finishes, and electrical installation .

5.3 Approval of calculations and drawings by North American shall in noway relieve the Builder of the responsibility for conformance in allrespects with the requirements of this specification.

5.3 .1 Drawings and calculations shall carry the approval of a MechanicalEngineer licensed to practice in the State of California. Fees shallbe borne by the Builder.

5.4 Approved design calculations and shop drawings shall be in reproducibleform.

5.5 The Builder is cautioned that work accomplished prior to drawing approvalis subject to rejection if }t does not comply with the requirements ofthe approved shop drawings .

5.6 The Builder shall deliver to North American four copies of a maintenancemanual describing the aperating and maintenance procedures required forthe vessel and system .

6. DESIGN REQUIREMENT S

6.1.1 The dewar shall be capable of storing liquid hydrogen so that lossdue to heat leak shall not exceed one (1) per cent in 24 hourswith the dewar approximately 90 per cent full .

6.1 .2 External ambietn temperature range for the dewar shall be from minus20°F to plus 125°F .

6 .1 .3 Both inner and outer vessels shall be marked with the ASME Code Stamp .

_000 -fiAI,bf)I~ UID -HYDROGEN- DEWAR---- r

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HDMSt00008101

Specification No . 830-4

-6.1.11 The de- war shall be designed on the basis of containing liquid hydrogen,liquid nitrogen , water or liquid oxygen.

6.1,5 The annular space of the dewar shall be capable of evacuation to fivemicrons of mercury absolute pressure .

6.1.6 The-inner vessel shall be suspended within the outer jacket by a lowheat leak suspension system. The inner and outer vessels, togetherwith the suspension systems and mounting pads shall be capable of with-standing horizontal accelerations of 0 .2G with the inner vessel filledwith liquid oxygen at 9.5 pounds per gallon. Accelerations producedby shipping forces shall be provided for by suitable approved means .

6.1.7 The inner vessel shall be designed on the basis of not being evacuatedbelow one atmosphere unless the annular space is at operating pressure.

6.1.8 Both inner and outer vessels shall be of all welded construction .

6.1.9 The outer vessel shall be provided with manway opening and cover from1hr outside to the inside of the inner vessel without disturbing thevacuum level in the annular space . Lifting lugs shall be provided onthe manway covers . Manway configuration shall be as shown on Drawing830-M2.

6.1.10 The-aneess max-may area at the top of the outer shell shall be providedwith a-10 ft. 0 inch square work platform and caged access ladder .The -ladder shall extend a distance of 9 ft . 3 inches below vesselcenterline . Platform shall be designed for a uniform loading of 100#sq* ft.

6 .1.11 The dewar shall be provided with adequate permanent lugs for lifting

as required for installation.

6.1.12 The dewar shall have all annular space vacuum equipment together withinner vessel instrumentation located in a full height, double deerweatherproof cabinet . The vacuum pump shall be located within the

cabinet so as to be readily removable for servicing. The cabinet shall

be mounted within 10 feet of vacuum nozzle . ( See Paragraph 7.4.10) .

6.1.13 The weatherproof control cabinet shall be attached to the outer shall,Double access doers shall be provided the full width and height of the

cabinet. The cabinet shall be pre'9ided with a vent at the highest

point , so that no gas packets are allowed to form, and a bottom drainfor removal of 6-ondensatien.

6.1 .14 All vacuum jacketed nozzles shall have the jacket closed as shown onthe drawings.

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Specification No, 830-4

6.2 INNER VESSE L

6 .2,1 Internal operating pressures

6 .2.2 Internal design pressure :

6.2.3 Design temperature ranges

6.2.11 Corrosion allowance :

6.2.5 Shell outside diameters

6.2.6 Capacity:

55 psig with 0 psis External,

60 psig Internal with 0 psia External .

Minus 4230F to plus 100eF.

Zero .

10'-6" .

28,000 liquid gallons plus 10% percent ullage.

6.2.7 Materials shall be new stock conforming to their respective designatedspecifications as follows :

Shell . . . . . . . . . . . . . . . ASTM A21.0 , Type 321, 317, 304or ASTM B 209, GNL 0A or GM111A .

Plate, Brackets and C li ps . . . . Same as shell.

Threaded Rods . . . . . . . . . . . ASTM A320 - B8F (cold drawn) ..

Turnbuckles and Locknuts . . . . . . ASTM A182 - F3011 .

Pipe . . . . . . . . . . . . . . . ASTM 312 - TP 304 or 321 .(Schedule 10S) .

Fittings . . . . . . . . . . . ASTM A403 -WP 3011 or 321 .

Flanges . . . . . . . . . . . . . . ASTM A182 - F 3011 or 321 .

Gaskets . . . . . . . . . . . . . . Conoseal & as shown on Drawings .

Radiation Shielding . . . . . . . . On approval and as noted an the

Tubing . .

drawings .

2/3ASTM AM , Type 321 or 3117.

Tube Fittings . .YS /s M 1 - T gSGl AYWZ5-ALEZ S'li. .S, 3c4 S sties,

. . . . . . 18-8 S/Stl., socket weld.

6.2 .8 Belleville washers shall be supplied for all inner vessel and flangebolting fabricated from 17-7 PH S/Stl .

6.2 .9 The anti-vortex baffle assembly shall be removable through the manway.

6-.2 .10 The three-inch fill and 8 inch inlet and outlet lines within theannular space shall be fabricated from Schedule 5S stainless steelpipe .

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Specification Ne . 830-b

6.2.11 A leap shall be provided in all lines sufficient to form a vapor trapand to allow thermal expansion without expansion joints .

6.2.12 A11 piping terminations to be connected by Nerth American shall beweld end or Conoseal as shown on the drawings .

6.2.13 All flanges invilMing blind tapped holes sha11 have "Heliceil " inserts .Cie hwtdrd per cen t "felicoil" spares , suitable boxed and identified,shall be provided by_the Builder.

-6.2.1b The collection header shall have panel filters on each side as shownin Drawing 830-143 . The framework shall be made to fit the filterssnugly when installed,

6.2.1.!.1 The collection header shall have a two inch deep trough.

6.2.15 The pressurizing diffuser shall be designed to prevent direct impinge-ment of the pressurizing gas on the surface of the liquid . Total openarea ®f the diffuser shall be a minimum of 30 square inches .

6 .2.16 AU gasketed closures and connections shall be provided with two sparegaskets suitable boxed for storage and marked fir identification .

6 .3 OUTER VESSEL

6.3 .1 External operating pressure : Atmospheric .

6 .3.2 External design pressure : Shell and heads . . 17.0 psia.(with annular space at 0 .0 psia)

6.3.3 Design temperature : Minus 20°F to plus 125'F ,

6.3.b Operating temperature : 70°F.

6 .3.5 Corrosion allowance : 1/16 inch.

6.3.6 Shell inside diameter : l2~-6" ( exclusive of s tiffonors) ,

6.3.7 Maximum overall length : 58°-6 .

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HDMSt00008104

Specification No . 830-4

6.3 .8 Outer vessel material shall be as follows:

Shell . . . . . . . . . . . . . ASTM A285_C or A212-B

Heads . . , . . 0000 . , . ASTM A285-C or A212.B

External Plates, Brackets & Clips . ASTM A285-C

Internal Plates, Brackets & Clips . ASTM A212-B in accordance W/A300 Spec .

Support and Stiffener Rings . . . . ASTM A7

Manway Well . . . . . . . . . . . . AS1'M A240 Type 321, 347 or 304

Manway Well (Inner Wall ). . . . . . ASTM A240 Type 321, 347 or 304

Pipe (Inner Connecting ) . . . . . . ASTM A312-TP321, TP347 or TP304

Pipe Lead Throughs . . . . . . . . ASTM A240 Type 3219 347 or 301

Fittings . . . . . . . . . . . . . ASTM A234 - Gr. II - Non Cryogenic

Flanges . . . . . . . . . . . . . . ASTM A181 - G, II Non Cryogenic

Flanges . . . . . . . . . . . . . . ASTM A182 - F304 or F321 -Cryogenic

Gaskets (Vacuum Pump Connection) . . Neoprene '0' Ring

Flange Belting (Well Cover) . . . . ASTM A193-B 8

External Manway Flange Gaskets, . . Flexitallic style "CG"

Internal Manway Flange Gaskets . . . Flexital].ic style "CG"

Bellows . . . . . . . . . . . . . . . Laminated - Convoluted Type 321or 347 Stainless Steel

Vacuum Piping (External ) . . . . . ASTM-B88 Type K - Hard drawn

Vacuum Fittings (External ) . . . . . ASTM B124 Alloy 12 - Wrought

Vacuum Flanges (External ) . . . . . . ASTM B124 Alloy 12

Vacuum Gaskets (External ) . . . . . . '0' Rings

Vacuum Tubing . . . . . . . . . . . . ASTM-B5B Type 'L' - Soft Annealed

Vacuum Tube Fittings . . . . . . . . ASTM B124 Alley 12 - Wrought

Control Cabinet . . . . . . . . . . ASTM A283 and ASTM A7

- 28,000 GALU)N-- LIQUID- OML DEWAR

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HDMSt00008105

Specification Ne. 830-14

6 .3.9 All cold lines penetrating the cuter vessel shall have stainlese steel .spacer discs or sleeves that shall provide a minimum heat path of 1 2inches between the cold lines and the carbon steel surfaces .

6 .14 HEAT E7~CHANGER

6.14.1 Basic design of the heat exchanger is shown en the drawings,

6.14.1.1 Design calculations are not required .

6.14.1.2 Shop drawings showing fabrication details, layout, tolerances, etc .are required and shall be submitted as described in Paragraph S.

6.14.2 The heat exchanger shall have a minimum tub. and header surface areaof 14500 square feet.

6.14.3 Tubes shall be formed in a configuration approximately as shown enthe drawings .

6.14.14 Coils shall be supperted to sustain their weight . Adjacent coils shallbe positioned and supported to prevent contact with each ether.

6.14.5 Headers shall be supported With suitable brackets as indicated on thedrawings.

6.14.6 Materials shall be new stock conforming to their respective designatedspecifications as indicated below and as shown en the drawings.

Pi

Tu

Ve

Nu

pe . . . . . . . . . . . . . . . ASTM 312-TP 3014Schedule 1405

bing . . . . . . . . . . . . ASTM B75-55 Type OF

nturi orifices . . . . . . . . . ASTM B133-51sT

ts . . . . . . . . . . . . . . . . ASTM A1914-8

321 .r3147

Bolts . . . . . . . . . . . . . . . ASTM A320-B8F (cold drawn)

Fi

Fi

ttings ( stainless) . . . . . . . . ASTM A-1403-WP 3014

ttings ( copper ) . . . . . . . . . ASTM B75-55 Type OF

321 or 3147

6 .14.7 CLEANING

6 .14.7.1 Prior ti installation , copper tube sections and header sub-assembliesshall be cleaned as follows .

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UHDMSt00008106

Specification No . 830-!4

6 .11 .7 .2 COPFER

6 .14.7 . 2 .1 Degrease : Degrease by flushing with trichlereethylene MIL-T-7003,stamIrd grade or with a mild alkaline cleaner of 6 to8 ounces of Three Ne. 141142 per gallon in water at 160°F to 180•F.All traces of oil or grease shall be removed from all surfaces.

6.14.7 .2 . 2 Rinse : Rinse with distilled or deionized water if the mild alkalinecleaner was used until the detergent is no longer evident.

6.11.7.2 . 3 Acid Cleans Flush or immerse is an acid selutien of technical grade- hydrichloric acid (to meet Federal Specification 0.L-86), 20,E by

volume, until surface area is bright and free of oxidation .

6 .11 .7.2 .14 Rinses Rinse all surface with distilled or doianized water untilthe pH of effluent equals the pH of influent.

6 .14 .7.2.5 Dry : Drain and immediately dry with dry, hydrocarbon free nitrogen .

6 .14 .7.2 . 6 Seals Seal all openings against contamination by appropriate plugsor pelyethylene coverings.

NOTE : Copper tubing must be free of all oil, grease, resin andother foreign materials prier to acid cleaning ,

6 .11 .7 .3 STAINLESS STEEL

6 .14 .7.3.1 Digreas o Flush with t_richloreethylene MIL-T-7003, standarddegreasing grads until all traces of oil or grease have besaaremoved from all surfaces .

6.14.7 .3 .2 Seals Seal all. openings against contamination by appropriateplugs or polyethylene coverings .

6.14.8 HYDROSTATIC TESTING

6.11.8 .1 After instafatien, the completed heat exchanger shall be hydrostaticallytested to 225 prig with distilled or deionized water . Pressure shallbe maintained constant for 30 minutes with the pressure source off,

Water used for testing shall be heated to 160°F to 200°F 0

6.14.8 .1,1 All leaks shall be repaired by the Builder and the system retesteduntil a no leak condition has been obtained ,

6.14,, 8 .2 Immediately follewi g the hydrostatic testing, all water shall bedrained and purged from the system and the heat exchanger shall bedried with dry hydrocarbon free nitrogen.

6.14 .8 .2.1 Drying shall continue until a dew point of minus 50°F is reache dor until moisture content of discharged nitrogen is 30 ppm by volume.Test dew peiut with a CEC Moisture Monitor Type 26=301.

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HDMSt00008107

Specification No . 830-14

7 . INSTRUMENTATION', VACUUM SERVICE EQUIPMENT AND EIECTRICAL REQUIREMENT S

7 .1 INSTRUMENTATION

7 .1.1 A Heli.coid pressure gauge with six inch dial face shall be pre'id.d forindicai±- the inner vessel vapor phase pressure . The gauge pressurerange shall be at least 50% above the design maximum eperation pressureof tirs inner shell . ?he gauge shall be redlined at the maL iflumg-prestuo of--the inner vessel and shall be equipped with a plasti c

face and neoprene "blowaeut" plug. A Dahl needle valve shall bezueuflted -upstream of the gauge to permit isolation .

7.1.2 A Hastings Model L9'-1 thermocouple Vacuum Gauge 0 to 100 microns ofmercury absolute shall be used to measure the fine vacuum of the ✓

annular space. This gauge shall be suitable for use with 110 volt ,60 cycle.

7 .1.2 .1 A Hastings Model DV-5 Gauge Tube , 0 to 100 microns , shall be mountedon zvw u tisn line , complete with cable to connect to Vacuum Gauge .A Dahl needle valve shall be mounted upstream of Gauge Tube to permitisolation .

7 .1 .3 A compound Helicoid 15 psig to 30 inch Hg vacuum gauge with a six inch-face shall be presided to measure the rough vacuum of the annular-space . Provide plastic face and neoprene "blow-out° plug. A Dab].needle valve shall be mounted upstream of the gauge to permit isolation .

7 .1.14 A Barton Model 200 aluminum bodied liquid level gauge with 0 to 10inch water scale and pulsation dampeners shall be supplied for us eon liquid hydrogen service and shall be calibrated in gallons as well ✓

as inches of water . It shall be provided with a three valve manifoldconsisting of two black valves and one by-pass valve .

7 .1.5 All dial gauges shall be supplied with Ashcroft #11065 pulsation dampeners

7 .1.6 All gauges and controls shall be mounted en a common panel along wit htheir respective isolation valves and shall be conspicuously labeledas to purpose by nameplates . The nameplates shall be made of black-whito-black engraved plastic tabs with block lettering at least three-eig .s inch in size .

7 .2 VACUUM SYSTEM

7 .2 .1 A Kinney KMB 30, KC-5 electric meter driven mechanical booster vacuum-pump shah be provided and installed . This pump shal]i maintain an

absolute pressure of 5 microns of mercury maximum in the annular space . vThe eleutria motors shall be totally enclosed fan cooled and shall have

separate magnetic starters and overload protection . Both pumps shallbe provided with belt guards .

7 .2 .1 .1 Initial evacuation of the annular space shall be accomplished with aseparate roughing pump supplied by the Builder,

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Specification No . 83O.

7 .2.2 One four inch line shall be provided for evacuation of the annular space .It shall contain the following hardware and iastrumentatien connection :

7 .2.2.1 A feur inch; Consolidated Vacuum Corp, Model No, VCS-1~3, remotelyoperated vacrim tight valve shall be provided between the pump andthe-vessel connections in the four inch vacuum line to prevent lessof vacuum in the event of the power failure while the pump is isoperation and the manual shut-off valve is open, This valve shall.be spring leaded normally closed and shall be electrically interlockedse that it will open en]y when the pump is running . Gaseous nitrogenat 150 psig will be available within 10 ft . of the boa. Connection.,to nitrogen service shall be made by the Builder.

7 .2 .2 .2 One four inch9 Consolidated Vacuum Corp . Model 1 .. VCS .4.2, manuallyoperated vacuum tight valve shall be provided in the vacuum line atthe outlet from the annular space .

7 .2 .2 .3 An oil trap capable of entrapping the full quantity of oil containedin the vacuum pump shall be located in the vacuum line between theelectrically operated and manually operated shut -off valve.

7 .2,2.11 One, four inch internal evacuation filter tube extending the lengthof the vessel in the annular space shall be provided . The filtertube- shall be- immersed in the insulation and shall prevent the entry f

-the insulation into the evacuation line and vacuum pump . The tltertube shall be removable ,

7 .2.2.5 A sintered bronze 10 micron nominal rating filter element shall beinstalled between the manually operated vacuum valve and the vacuumpump . Minimum filter area shall be 125 square inches.

7.2 .2.6 One - two inch, Consolidated Vacuum Corp. Model Ne. VCS.4 2 manuallyoperated vacuum tight valve shall be provided in the vacuum line toisolate vacuum pump -when using external vacuum equipment .

7 .2 .2 .7 One - four inch, Consolidated Vacuum Corp . Model No. VCS-1j.2 manuallyoperated vacuum tight valve shall be provided between the roughing

pump connection and the main vacuum header .

7 .2 .2,8 One - 3/8 inch UOV solenoid eperated valve, normally open, shall. beprovided fir control cabinet pressurization . The vlve shall bemounted inside the cabinet with pressure conneetienroutside thecabinet ,

7 .3 SERVICE DQUIPMENT

7 .3 .1 One o four inch safety head and rupture disc with carbon steel bodyand an aluminum rupture disc with vacuum support set to rupture at 15psig @ 70°F shall be provided and installed in the outer vessel shell .This assembly shall be accessible from the platform specified isParagraph 6 .1.10.

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Specification. No. 830-14

7 .3.2 Builder shall provide three spare burst discs , suitab]y boxed andtagged , for each requirement.

7,14 ELECTRICAL EQUIPMENT

7 .14.1 AU elacal equipment including starters, fixtures and auxiliaryega3piaant lsnated in control cabinet shall be NEMA XII9 lightingfixture shall be Vapor Tite .

7 .4 .2 The electrical equipment specified in Paragraph 7 .14.1 shall be located-within the uontral cabinet so that 1480 volt, 3 phase, 60 cycle serviceis the only 60 cycle power connection required for vessel operation.Power source will be by others.

7.14.3 Builder shall mount a NEMA VII circuit breaker en the exterior of thecontrol cabinet. This breaker shall serve as a main disconnect forthe entire vessel. Power connections to this breaker shall be made bythe Builder from a 1480 VAC source appreximate]y 20 ft. away .

7.14.11 All conduit shall be rigid galvanized except fer main feeds to vacuumpump which shall be Sealtite Type UA flex.

7,145 All wiring shall be TH . Minimum size shall be Ne, 12 MG .

7 .14.5.1 All junction boxes shall be cast iron with gasket and screw cover .

7 .14.6 Laminated plastic nameplates shall be supplied and installed for allelectrical equipment and pressure instrumentation designating itemname and function, Letters shall be 3~1~ 6 ~T44ohp block , engraved .

7.14.7 Provide typewritten directory for all circuits supplied frem loadcenter ,

7 .14.8 Provide one incandesenet lighting fixture (100 watt), with dear- operatedswitch f or illumination, inside cabinet .

7 .14,9 Builder shall provide conduit seals with compound in all conduit runs

entering control cabinet ,

7 .14.10 Contrel cabinet shall be NEMA XII, Hoffman, modified to permit inter-nal pressurization to five P,S .F . The Builder shall provide a dead'weight type relief device to maintain this pressure in the cabinet.All internal surfaces of the control cabinet shall be insulated with aone inch thick layer of heat resistant fiberglass .

7,14 .11 The wilder shall provide a door-eperated switch to close the cabinetpurgz valve, (Ref. Paragraph 7,2 .2 .8), when the doors are open, andopen the purge valve when the doers are closed. This switch shall beequipped with an externally mounted manual override switch to deactivatepurge valve prior to opening deer.

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Specification No . 830-1~

8 . WELDING & BRAZING

8 .1 All welding and welder qualification procedures shall be performed inaccordance with the applicable paragraphs of the ASME Cod ., Sections VIIIand IX for the material being welded .

&.2 Ail gelds shall be permanently identified on or adjacent to each weldc iidoic 'witfi the requirements of Section VIII of the ASME Code.

i ressions in the metal for identification purposes more than 0 .005 ofan inch in depth will not be allowed.

8,3 Welds of carbon steel to stainless steel shall be made with E-310electr.des .

8 .1i. Root passes of welds on corrosion resistant steel components shall bemade by inert gas shielded arc method with helium or argon th. shieldinggas. Subsequent passes may be made by manual shielded arc or the inertgas shielded arc method . An inert gas back purge shall be maintained

during all welding of stainless steel until the weld is cool ,

8 .5 Gas welding will net be permitted .

8 .6 All copper tubes shall be silver brazed .

8.7 Flux shall be removed from exterior of brazed parts as seen as possibleafter brazing. Flux removal shall be accomplish with het deieized indistilled water . ..

9 . CLEANING

9.1 Protect all sealing surfaces during blast and chemical cleaning .

9.2 Al]. cleaning and rinse solutions shall be sprayed, circulated, or appliedin a manner that all surfaces of the system to be cleaned shall bocompletely wetted with the solutions . Rinse water shall not be reused .

9 .3 Once water solutions have been introduced into the system, the surfacesto be cleaned shall not be allowed t. beteme dry between the steps ofthe procedure until the drying step has started .

9.1~ All sections of the system to be cleaned that can trap or retain anyliquid shall be drained or emptied between the application of each differentsolution or chemical mixture . During or after the final rinse and prior tothe drying step, each flange connection shall be loosened or opened t.assure the removal of all contamination from between flange faces .

9°5 The Builder shall seal all systems following cleanliness inspections andshall provide closures for all openings specified en Drawing No. 830.N1.

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HDMSt00008111

Specification No . 830-1t

9 .6 BLAST CIEAi ING

9.6.1 Carbon-free and iron-free sand (#LO mesh) or alundum grit (#60 to #320mesh), neither of which has been used before on other metal, shall beused in all blast cleaning operations.

9.6 .2 Blast metal surfaces to remove all mill scale, weld flux, foreign metalsor other foreign matter . Remove all dust grit from the metal .

9.7 CHEMICAL CLEANING MATERIALS

9.7 .1 Trichloroethylene solvents MIL-T . .7003, high purity grade.

9.7 .2 Mild Alkaline Cleaners Detergent type cleaner such as Turco No . 11090,as manufactured by Turco Products, Inc ., 6135 South Central Avenue,Los Angeles, California .

9.8 CHEMICAL CLEANING PROCESSES

9.8 .1 Degreases Flush with a mild alkaline cleaner solution at a minimumtemperature _of lhO°F or trichloreothylene solvent until all traces ofoil and grease are removed.

9.8.2 Flush: Rinse with distilled or deionized water until effluent water pHand influent water pH are equivalent .

9.L3 Etchr Etch for a period of 5 to 30 minutes with a mixture of 3% technicalgrade hydrofluoric acid, 10% technical grade nitric acid (by weight) andthe remainder deionized or distilled water.

9.$.!G Passivates Flush with a solution of 35% to b5% technical grade nitricacid (by weight) and the remainder deionized or distilled water.

9:$.5 Dry : Purge with dry nitrogen until a dew point of minus 50°F is reachedor until moisture content of discharged nitrogen is 30 ppm by volume ,

9 .$.& Ii pecte Inspect by visual examination , and wipe the cleaned surfacewith a clean white, lint free cloth. After wiping , no evidence of oil,stain, rust, scale, solid particles, or any foreign material on thecloth will be accepted.

9 .8 .7 Sealg Seal all openings against contamination by appropriate AN plugsand 0-rings or pipe plugs . Flanges and other openings shall be sealed

with blind flanges as indicated on the drawings.

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IIOI muim i iiinmimmBNA05219058

I IHDMSt00008112

Specification No. 830-I

9 .9 CLEA1ING SEQUENCE

9 .9.1 Inner Vessel, inner surface :

a) Blast cleanb) Degreasec) Flush, if degreased with alkaline cleanerd) Etche) Flush

f) Passivateg) Flushh) Dry

j) Inspect, using white cloth examination

k) Seal

9.9.2 Inner vessel, outer surface :

a) Blast cleanb) Degreasec) Flushd) Visual inspection

9.9.3 Outer shell, inner surface :

a) Blast cleanb) Degreasec) Flushd Visual inspectione Seal

9 .10 Authority for determining adequacy of cleanliness of all work rests withNorth American.

10. FABRICATION AND INSTALLATION ,

10.1 C~NERAL

10.1.1 A11 material and personnel qualifications, including fabrication proce~dures, Frill be witnessed and approved by personnel designated byNorth American.

10 .1 .2 Workmanship shall be subject to the provisions of Article VI of theFixed Price Contract .

10.1 .3 On all operations where flame cutting, arc cutting, or arc-air gougingare used, 1/6k inch of material below the scarfing marks shall be remove d

10 .1 .14 Tube flares shall conform with Military Standard MS 3358!1 .

10.1.5 Tubing shall be supported within six inches of all bends, and five feetmaximum centers on strpight runs .

28,000 GALLON LIQUID HYDROGEN DEWAR

IIOI muim i iiinmimm114.

BNA05219059U

HDMSt00008113

Specification No . 830~L t

10.2 The Builder shall fabricate the vessel in his shop . The Builder iscautioned that work of other trades will be in progress during theinstallation at job site ,

10.3 The Builder shall perform all shipping and unloading operations , and theinstallation of the vessel in a manner to insure safe handling,

10 .1.L The Builder shall install , level and adjust the vessel at the job siteon the support structure provided by North American ,

io.lt,i The Builder shalI furnish all nuts, shims, and mounting hardwarerequired to install the vessel.

10.5 Installation or "topping off" of insulation which is done in the field,shall be done only on Saturday or Sunday .

10 .6 All male threads of stainless steel bolting shall receive 0 .0001 inch

nominal copper plate prior to assembly .

10 .7 Threaded and flanged connections in vacuum service only may be made upusing vacuum grease.

10.8 All components , including manually operated valves , pressure operatedvalves and electrically operated valves shall be functionally checkedprior to installation in the piping and after final field erection .

10 .9 All internal removable fastening devices shall be safety wired in placeusing stainless steel wire .

11. TESTS

11.1 The following tests shall be performed by the Builder using laboratoryprecision type equipment, calibrated to assure accuracy . All tests, pro-cedures and results will be witnessed by and subject to the approval ~fNorth American .

11.1.1 HYDROSTATIC TEST

11.1.1. 1 The inner vessel shall be hydrostatically tested in accordance with

Section VIII of the ASME Code . The same gaskets specified in

Paragraph 6 .2 shall be used during hydrostatic testing ,

11,1 .1 . 2 Test pressure equal to 150% of design pressure shall be maintainedwith no decrease for thirty minutes . Pressure shall be built upgradually to mamdmum test pressure with continual inspection to

prevent damage to the system .

28,000 GALLON LIQUID HYDRGOEN DF AR

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BNA05219060U

HDMSt00008114

Specification No. 830-4

11.1.2 MASS SPECTROMETER LEAK TEST

11.1 .2.1 Complete Helium mass spectrometer vacuum testing shall be performed .The testing shall be performed in the Builder' s shop .

11.1.2 .2 A "no-leak" reading shall be obtained on a Consolidated Electrody-inarnics Corporation Model 120 Mass Spectrometer Helium Leak Detectorset at 10-9 atm-cc/sec sensitivity .

11.1.2. 2.1 Equipment shall be operated in accordance with Manufacturer'soperating instructions .

11.1.2 .2 .2 Prior to testing, the Mass Spectrometer shall have been certifiedfor accuracy at 10-9 atm/cc/ec and the certification presentedto North American for approval.

11 .1.2 .3 Builder shah3 evacuate the annular space down to 10 microns or less .The ~vacuating .line to the vacuum pump shall be blanked off with asuitable Consolidated Vacuum Corporation - VCS or VST series - vacuumgate valve.

11 .1.2 .4 The Builder-shaU measure the annular space vacuum during the testwith the vacuum gages specified in Paragraph 7. Testing shall besuspended if the vacuum exceeds 30 microns, and shall not be resumeduntil the annular space has again been evacuated down to 10 microns .

11 .1.2.$ The vacuum line leading to the Kass Spectrometer shall be $/8 inch

O .D . copper tubing leading from a suitable vacuum valve closecoupled to the outer vessel . All connections in this line shall bebrazed up' to the leak detection equipment .

11.1.2 .6 After the annular space has been evacuated to 10 microns and thevacuum pump isolated, both the inner and outer vessels completewith all lines, flanges, and fittings to the point where theseextend through the outer vessel, and all weld seams shall be sprayedwith a fine jet of Helium .

11 .1.2.7 All leaks shall be repaired by the Builder, and the test repeated.

11,1.3 VACUUM RETENTION TEST

11.1 .3.1 Fo c i:g the Mass Spectrometer Test, and after vessel installationsthe -annular space Thai e evacuated to less than $ microns and thepump shut off. After 2W hours under these conditions, the totalpressure increase in the annular space shall be recorded. The averagepressure increase rate in microns of mercury per hour shall be calculate

An-average pressure increase in excess of one micron per hour is notacceptable . This test shall be conducted while the vessel is at ambientpressure and temperature.

28,000 GALLON LIQUID HYDROGEN DAR

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16,

BNA05219061U

HDMSt00008115

Specification No. 830-h

11.1.1. After installation, the vessel shall be tested by the Builder to demon-strate adequacy of the suspension, piping and vacuum systems by thefollowing method :

11.1.!..1 With the annular space evacuated to five microns or less, the vesselshall be filled to the 90% full mark with liquid nitrogen and allowedto-reach thermal equilibrium. The vessel shall then be subject to 60psig pressurization with gaseous nii~rbgen for a period not less thanfour horns. The annular space pressure shall not have increased morethen one micron in this period of time . The vacuum pump shall beisolated from the system during this test .

11.1.1 ..2 Liquid and gaseous nitrogen will be furnished by North American .

11.1.b.3 he Builder will not be able to conduct this test for a period u pto 90-days after completion of the vessel installation . North AmericanidU motif- the Builder five days prior to the time this vacuumretention test is to be conducted.

11..1.5 AEAT LEAK TEST

11.1.5.1 The Builder shall conduct heat tests to demonstrate the capabilityof the vessel to store LH2 in accordance with Paragraph 6 .1.1.

11.1.5.2 Liquid nitrogen will be used as the cryogenic test medium.

11.1.5.3 After completion of the tests described in Paragraphs 11 .1.2 and11 .1 .3, the Builder shall evacuate the annular space to five microns .The Builder shall attach an integrating gas flowmeter to the ventstack. The vent stack will be provided by others . The Builder shallprovide all instrumentation equipment and certified calibration datato determine the liquid nitrogen loss rate for a 2b hour period .

11 .1.5.1. Builder shall furnish complete heat ransfer calculations and dataso that the loss rate obtained with LN2 can be extrapolated and

the expected m2 loss rate obtained .

11.1.5.5 An LH2 loss rate in excess of that specified in Paragraph 6 .1.1 isnot acceptable .

11.1.6 Builder shall open and close all vacuum valves during the test specifiedin Paragraph 11.1 .h to demonstrate that they operate smoothly and easily.Proper operation of rembtely operated valves shall be demonstrated.

12. INSPECTION

12.1 All inner shell, hoes and nozzle attachment butt weld seams shall be 100%radiographically inspected. The radiographing shall be performed inaccordance with the applicable paragraphs of the ASME Coded Section VIII .

28,000 GALLON LIQUID HYDROGEN DEWAR 17 .

II0I muim i iiinmimm uiuiuuiuu i iBNA0521906 2

HDMSt00008116

Specification No. 830-?

12.2 The interpretation of radiographic negatives shall be the responsibilityof North American.

12.3 Dye penetrant inspection shall be performed on all welds not radiographi-cally inspected.

12.11 The Builder shall notify North American in writing 72 hours in advance ofcleanliness inspections ,

12.E Inspection procedures and fabrication shall be witnessed by North American~pproved-as z-egnired by authorized State or Municipal Inspectors, ASME

and Insurance Inspectors , and shall be subject to the approval of NorthAmerican for final acceptance .

12.6 If vessel is cleaned in the Builder's shop, North American will reinspect,for cleanliness , after installation at the job site .

12.6.1 Recleaning, if necessary, shall be at Builders expense .

13. FAINTING

13.1 1Phe outside surface of the outer vessel , including supports and accessories,shall be cleaned of rust ; scale , slag, weld spatter, oil or grease, pencilmarkings , and aabr other material which might strike through the paint orinterfere with bonding of the paint to the metal. Cleaning shall be bywire brushing or sandblasting .

13 .1.1 Stainless steel and aluminum surfaces shall not be painted .

13.1,2 The inside and outside of the control cabinet shall be cleaned andpainted in a manner identical to that specified for the outer vessel,

13.2 All exterior surfaces of the dewar and associated equipment shall bepainted with the following National Lead Company paints s

13 .2.1 First Coats 57-K-50 BISC Paint .

132,2 Intermediate Coats 5l~ L-% BISC Paint .

13.2.3 Finish Coats 58-J-53 without BLSC, 17875 White (Federal StandardNo . 595) .

13 .3 Paints shall be delivered to the job site in original sealed containerswith labels intact . Directions for mixing, applying and storing, asprinted on these labels shall be followe d

13J~ Each coat shall be applied to a 1-1/2 to 2 mil thickness .

13.5 The Builder shall protect all equipment and material adjacent to the workarea, by suitable drop cloths or other means ,

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IIOI muim i iiinmimmBNA0521906 3

HDMSt00008117

Specification No . 830-b

13 .6 At the conclusion of the work, the Builder shall clean and remove allpaint spots or stains, remove all waste materials, excess paintingmaterials, and dirt or debris from the area, and leave the premises in aclean and neat condition.

7h. PROGRESS SCHEDULE

ib.1 the Construction Progress Schedule included in this section shall becompleted and maintained by the Builder as a portion of this Contract .

ib.l .l The_ entries under "Description of Work" are the minimum items to bereported on . The Builder shall insert additional items as requiredso that the fins]. Progress Schedule will present a comprehensivepicture of the work to be accomplished. -

lb.2 Within seven calendar days after signing the Contract, the Builder shallsubmit the Progress Schedule showing the order in which he proposes toHarry on the -work, and dates on which the several important features willstart and be completed. Forms on which the Progress Schedule is to be

prepared will be finnished by North American

1 .2 .1 A sample schedule is included in this section as Exhibit A to illustrate- the way in which the schedule shall be filled out by the Builder .

1lt.3 Following approval of the Builders schedule by North American, thewilder shall enter actual progress of the various features of the sche-dule at one week intervals and immediately deliver five signed copie sto North Americ an .

28,000 GALLON LIQUID HYDROGEN DEWAR 19.

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II0I muim i iiinmimm 1 01001000 I IBNA0521906 4

HDMSt00008118

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