Engineering Design Specification ED0013961.pdf

ED0013961– MC-1 LN2 Dewar Specification

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Engineering Design Specification

Fermilab MC-1 Liquid Nitrogen Dewar

Specification Number: ED0013961

June 17th, 2025

Author(s): Jake Kintner Date: June 17th, 2025

Reviewed by: Jun Dong Date: TC Approval

Approved by: Terry Tope Date: TC Approval

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Record of Revision:

Revision Date Edited Comment

Rev 0 06/6/2025 JK Initial release

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TABLE OF CONTENTS:

1 LIST OF ACRONYMS

2 INTRODUCTION

3 APPLICABLE CODES AND STANDARDS

4 SCOPE OF SPECIFICATION

5 TECHNICAL REQUIREMENTS

6 PROJECT MANAGEMENT AND QUALITY REQUIREMENTS

7 DOCUMENTATION

8 WARRANTY

9 OPTIONAL ITEMS

10 Performance Acceptance Test 11 Appendix. Technical Questionnaire

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1 LIST OF ACRONYMS

ASME American Society of Mechanical Engineers ASTM American Society for Testing and Materials BPVC Boiler and Pressure Vessel Code LN2 Liquid Nitrogen PQR Procedure Qualification records WPS Welding Procedure Specifications WPQ Welder Performance Qualifications P&ID Piping and Instrumentation Diagram

MAWP Maximum Allowable Working Pressure GTAW Gas Tungsten Arc Welding PSIG Pounds Per Square Inch Gauge

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2 INTRODUCTION

This Engineering Design Specification will be the basis for the procurement of a Liquid Nitrogen Dewar

(DEWAR) for Fermilab Muon Campus 1 (MC-1). The DEWAR will supply both liquid and gas nitrogen to the

Mu2e experiment and the refrigeration room at MC-1. The DEWAR will have a minimum storage capacity of 15,000 Gallons. This document outlines the SELLER’s responsibilities and obligations necessary for completing the requirements as set forth herein. In this specification, the vendor of the equipment and services shall be referred to as the SELLER, and Fermi-Forward Discovery Group, LLC shall be referred to as the BUYER.

3 APPLICABLE CODES AND STANDARDS

3.1 List of Standards and Procedures

The following list of codes or their latest edition, drawings and standards as well as equivalent DIN/ISO/US standards, shall be applied to the engineering, design, fabrication, assembly, and testing of the DEWAR and its components:

a. ASME Boiler and Pressure Vessel Code (BPVC)

b. ASME B31.3 Process Piping

c. ASTM E493 Standard Test Methods for Leaks Using the Mass Spectrometer Leak Detector in the Inside-Out Testing Mode

d. ASTM E498 Standard Test Methods for Leaks Using the Mass Spectrometer Leak Detector or

Residual Gas Analyzer in the Tracer Probe Mode

e. ASTM E499 Standard Test Methods for Leaks Using the Mass Spectrometer Leak Detector in the Detector Probe Mode

f. ANSI/ISA-5.1 Instrumentation Symbols and Identification

g. CGA S-1.3 -2024 Pressure Relief Standards or equivalent

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4 SCOPE OF SPECIFICATION

4.1 General

The DEWAR will provide storage of LN2 for the BUYER’s MC-1 Nitrogen supply system.

The vaporizers will provide gaseous nitrogen to following.

a. Ullage space of the DEWAR to maintain operational pressure.

b. BUYER’s facilities and systems.

The SELLER shall furnish all facilities, equipment, special tooling, consumables, and material, except where explicitly excluded in this specification, and perform all work and services necessary to engineer, design, fabricate, assemble, test, and deliver to FERMILAB site a fully functional DEWAR in strict accordance with this specification.

The SELLER shall prove that the tank is as a standard item, produced within the last 10 years.

Any item requirements specified within this document that makes the tank non-standard should be presented to the BUYER.

The SELLER shall provide a P&ID of the tank.

4.2 INSTALLATION

The rigging and installation of the DEWAR is the responsibility of the BUYER.

Lifting eyes shall be located at the top and bottom of the tank to facilitate upright installation.

The concrete foundation where the DEWAR will be installed is the responsibility of the BUYER.

SELLER shall provide a drawing of DEWAR mounting plates.

5 TECHNICAL REQUIREMENTS

5.1 Nitrogen vessel

The LN2 vessel orientation shall be vertical.

The LN2 vessel shall be designed and manufactured in accordance with ASME BPVC Section VIII, Div. 1. The vessel shall be registered with national board.

Volume: greater than or equal to 15,000 Gallons.

Pressure rating: The nitrogen inner vessel MAWP shall be greater than or equal to 250 psig internal pressure with full vacuum externally (this is greater than or equal to 265 psid).

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Normal operating pressure: 90 psig.

Design temperature: -321 deg. F

The internal LN2 vessel must be designed for full vacuum with one atmosphere external pressure in the insulating vacuum space.

The maximum floor space available for the DEWAR and two vertical ambient air vaporizers is 20 ft x 12 ft. The layout of equipment on the existing concrete pad is shown in Figure 1 and Figure

2.

Figure 1. Available concrete pad outside MC-1.

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Figure 2. Nitrogen DEWAR and two vertical ambient air vaporizers on concrete pad.

5.2 Vaporizers

SELLER shall supply two aluminum ambient air vaporizers with a design pressure greater-than or equal to the inner vessel MAWP.

The vaporizers shall be capable of delivering 1,300 SCFH nitrogen nominal flow rate based on continuous (24 hour) service, an ambient temperature of 50 °F, relative humidity of 50%, and a approach temperature of 20°F.

The vaporizer shall be designed and manufactured in accordance with ASME B31.3.

The aluminum vaporizer shall be delivered with ANSI raised face flange termination.

The two vaporizers shall fit on the same concrete pad as the DEWAR.

Both vertical vaporizers shall have a combined footprint less than or equal to a 10’x10’ area.

The SELLER shall furnish electronic copies of the vaporizers’ pipe welding WPS, PQR, WPQ, and welding inspection documentation. SELLER shall furnish vaporizers’ quality control reports, including but not limited to:

a. Test equipment calibration reports.

b. Helium Leak check test reports.

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c. Pressure test reports.

d. In lieu of documents above, SELLER can provide certification documents stating that the vaporizer is fabricated in an ASME code compliant shop (B31.3 certificate) with quality assurance and quality control certificates.

SELLER shall provide documentation for proper vaporizer anchoring, if required.

5.3 Nitrogen vessel relief devices

To guard the DEWAR against any over pressuring, relief valves and burst disks are required. The safety valves shall have a set pressure of 135 psig and shall vent out to the atmosphere. The burst disks shall have a set pressure of 165 psig and vent to atmosphere.

Relief valves and rupture disks shall exhaust into a vent header with an outlet height of at least

10’ from ground level.

Relief device sizing shall satisfy CGA S-1.3 for the following provisions

a. Fire conditions.

b. Loss of insulating vacuum

c. Regulator failure on pressure building coil.

d. In lieu of the relief valve sizing calculations above, the SELLER can provide design information to the BUYER, including but not limited to:

i. Type of insulation used in the DEWAR

ii. Number of MLI layers, if applicable.

iii. Total inner vessel surface area and volume

iv. Total surface area and volume of nitrogen piping inside the DEWAR

v. Construction drawings

The relief valves and burst disks shall be easily accessible for inspection, servicing or replacement. Burst disks shall be provided with mechanical guards to ensure safety.

The SELLER shall make provisions for periodic inspection and replacement of safety valves without cutting or welding. The relief valves and burst disks shall have a three-way diverter ball valve to ensure the vessel volume is protected from overpressure during relief device inspection and replacement. The SELLER shall provide a pair of relief valves and burst disks for each branch of the three-way valve.

Any manual valve used for safety lockout purposes shall be equipped with a locking mechanism, including but not limited to the relief three-way diverter ball valve.

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Relief devices shall feature an insect protection mesh and discharge bends to protect operators from direct discharge to body.

The exhaust of LN2 reliefs and vents shall not impinge on carbon steel vacuum jacket(s) or into areas which may cause harm to people.

The primary safety relief valves shall be UV/UD stamped and shall meet the applicable requirements of ASME Code Section VIII.

5.4 Vacuum vessel

Vacuum vessel shall be designed and manufactured in accordance with ASME BPVC Section VIII, Div. 1. The vacuum vessel shall either be

a. ASME Code stamped.

b. OR have WPS, PQR, WPQ, and vacuum vessel calculations submitted to the BUYER.

The DEWAR vacuum vessel shall be designed to withstand a minimum of 15 psid differential pressures to atmosphere. This applies to both external and internal pressure loading. The vessel shall be designed to ensure that allowable stresses are not exceeded and to ensure that the vessel is resistant to buckling.

There shall be no condensation of water on the vacuum jacket of the DEWAR under normal operation. The maximum temperature difference between the DEWAR vacuum vessel and ambient temperature outside MC-1 shall not exceed 10 degrees Fahrenheit, considering ambient conditions to be 100 F and 55% humidity.

Vacuum vessel evacuation: a vacuum seal-off valve shall be provided separate from the vacuum relief. The seal off valve and pump-out line shall have a nominal outside diameter of 1-1/2” or greater.

The vacuum vessel shall have a port to install a vacuum transmitter gauge. SELLER may provide a transmitter gauge for vacuum indication, if standard to their design.

Vacuum vessel shall be protected by a relief device with an opening pressure not more than the lesser of the internal design of the outer vessel (as calculated by ASME Code) or 15 psig. Relief sizing shall comply with CGA S-1.3 and calculations shall be provided.

Vacuum vessel painted in color WHITE for outdoor use after final leak check by the SELLER.

Type of paint to be approved by BUYER.

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5.5 Piping

All piping shall conform to ASME B31.3 and the SELLER shall provide weld inspection documents.

Pipe and nozzles attached directly to the vessel shall meet the requirements of ASME BPVC.

SELLER shall provide weld inspection documents or certification that pipe welds were performed by ASME code welders for all other piping sections. Appropriate drawings showing all pipe sizes and materials shall be provided by the SELLER. In lieu of pipe drawings and welder qualifications, a certificate showing ASME B31.3 compliance, quality assurance, and quality control certificates shall be provided to the BUYER.

The DEWAR piping shall cover the following functions:

a. One liquid fill line connected to the bottom of the nitrogen vessel with manual valve.

b. One liquid fill line connected to the top of the nitrogen vessel with manual valve.

c. One vacuum jacketed liquid withdrawal line with manual valve to connect to cryogenics services.

d. One non-vacuum jacketed liquid withdrawal line with manual valve to connect to cryogenic services.

e. One vapor withdrawal line with manual isolation valve.

f. One overfill line with full trycock valve to prevent overfilling the DEWAR during nitrogen deliveries.

g. One gaseous depressurization vent line terminated with a silencer.

h. One pressure build-up loop to sustain a maximum flow rate of 232 grams/second at 90 psig under continuous use (24 hours a day 7 days a week).

i. One vapor back pressure regulator, set at 110 psig, that exhausts to atmosphere.

Liquid Nitrogen fill connection shall be the CGA standard 1-1/2” 2.4 stub Acme thread

(Identification #NI- 150).

The MAWP of piping shall be greater than or equal to the vessel’s MAWP except for piping noted in 6.5.7.

All piping that can be exposed to LN2 temperatures shall have the same design temperature as the nitrogen vessel.

All piping, which can be exposed to cryogens in trapped volumes, shall be protected with trapped volume reliefs, without an intervening shut-off valve.

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All piping which can be exposed to the tanker delivery pressure must have a MAWP greater than or equal to 400 psig.

5.6 Mechanical Design Requirements

The mechanical design shall consider ambient, dynamic, thermal expansion, thermal contraction, fatigue, and condensation effects.

All materials and components used in construction of the DEWAR shall be new and suitable for the use for which they are intended.

Materials known to become brittle at cryogenic temperature shall not be used for components that may become cold during normal or accidental conditions.

The DEWAR pressure vessel shall be ASME BPVC stamped.

The SELLER shall ensure that materials to be used for pressure vessel components meet all requirements of ASME BPVC.

Any materials used in pressure containing piping components of the DEWAR shall conform to

ASME B31.3 material requirements for appropriate fluid service category and operating temperature range.

Any fittings, bends, miters, laps, and branch connections of the DEWAR shall conform to ASME

B31.3 requirements for appropriate fluid service category.

Any flanges and blanks of the DEWAR shall conform to ASME B31.3 requirements for appropriate fluid category.

The DEWAR, its instrumentation and equipment shall be designed to operate in an external location exposed to elements such as rain and wind with the environmental conditions:

a. Summer +100F [+37C], 55% humidity.

b. Winter -13F [-25C], 80% humidity.

6.6.10 The DEWAR shall be designed to have a maximum boil-off rate under steady conditions at full capacity of less than 0.2% per day.

5.7 Handling

The DEWAR shall have lifting lugs to move the empty DEWAR at installation.

Lifting lugs shall comply with ASME BPVC VIII Div. 1 rules for attachments. Lifting lugs shall be included in the vacuum vessel calculations.

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The SELLER shall design all lifting attachments on the vacuum vessel per ASME BTH-1 Design of

Below-the-Hook Lifting Devices. The SELLER may propose an alternative engineering standard subject to BUYER’s approval.

The weight and center of gravity for the DEWAR shall be clearly indicated on the DEWAR using permanent labels

5.8 Instrumentation

All instruments and valves shall be identified and labeled. An engraved piping schematic with named reference to each valve, instrument, and interface shall be attached to the vacuum vessel in a visible location for operators’ reference.

The MAWP of all instruments and valves shall be greater than or equal to the maximum pressure to which they can be exposed in all modes of operations.

All pressure indicators shall be equipped with process isolation valves.

Two additional capped ports shall be connected to the top and bottom gauge lines.

The DEWAR shall be provided with a differential pressure liquid level gauge connected between the vessel top and bottom. A manifold of two shutoff valves and a bypass shall be provided. A liquid inventory versus gauge indication chart shall be provided.

The DEWAR shall be provided with a pressure gauge attached to the top gauge line. The gauge shall be rated for vacuum service.

All pressure indicator lines shall feature fittings to connect electric pressure transmitters to allow for connection of buyer instrumentation.

6 PROJECT MANAGEMENT AND QUALITY REQUIREMENTS

6.1 Fabrication Requirements

Vessel welding shall be done in accordance with ASME BPVC VIII requirements and piping welding per ASME B31.3.

All welding shall be done by the GTAW process, using welding quality argon gas for the inert shield.

All welds shall be internally purged with welding quality argon gas during the time of welding and post welding treatment.

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All welding shall be done in such a manner that the weld surface is smooth and free of irregularities. No visible metal chips or foreign material may be detectable inside any component of the DEWAR. All external surfaces in the weld area shall be cleaned of heat tint, slag, and other deposits. No pickling paste is permitted.

Bending shall be done in accordance with ASME B31.3 Code requirements and good machine shop practices.

Each component and subassembly of the DEWAR shall be thoroughly cleaned at every stage of fabrication of all scale, spatter, flux, foreign materials, etc.

a. Cleaning agents shall be suitable for the materials of construction and shall be neutralized if necessary.

b. Weld spatter shall be removed by wire brushing using stainless steel brushes.

c. The inner surface of all pipes and tubes shall be free of grease, flux, moisture, dirt, and other foreign materials by vapor degreasing or suitable wash.

d. After cleaning, each section shall be blown dry with clean dry air until no moisture remains.

6.2 Inspections and Tests

Inspections and tests shall be performed using properly calibrated measuring and testing equipment.

The SELLER shall conduct all tests, inspections, and examinations required by design and/or construction codes that are listed in this specification.

The SELLER shall conduct leak tests of the DEWAR, or its subassemblies as deemed necessary to achieve the leak tightness requirements.

Any test failure which is repairable by simple rewelding, or re-brazing, may be undertaken without further direct contact with the BUYER. Any leaks which have been repaired shall be fully documented and described by written notice to the BUYER upon delivery of the DEWAR.

The SELLER shall perform pressure tests required by design and/or construction codes that are listed in this specification.

6.3 Acceptance Tests

Both inner vessel, outer vessel and internal welded piping shall be leak checked with a mass spectrometer leak detector, in accordance with ASTM E493, E498, and E499 requirements. The

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SELLER may propose alternative leak test procedure subject to BUYER’s written approval. Total leakage shall not exceed 1 x 10-9 mbar*liter/second at vessel’s MAWP.

External piping shall be leak checked with a mass spectrometer leak detector, in accordance with ASTM E493, E498, and E499 requirements. Measured leakage shall not exceed 1 x 10-5 mbar*liter/second.

6.4 Shipping and Packaging

It shall be the responsibility of the SELLER to arrange for safe and efficient transport and delivery of the Equipment to the FERMILAB site. The SELLER shall advise of the method and route of shipping in advance. All copies of shipping instructions, bills of lading, and the name of carriers shall be forwarded to BUYER immediately when the Equipment leaves the SELLLER’s facility.

In preparation for shipping, the Equipment shall be covered or wrapped for protection against weather elements, dust, and damage to projections, shock loads, impacts, and rubbing. It shall be properly braced and cushioned within the packing so that it will not shift during handling and shipment.

The components must be properly supported and contained to prevent damage and contamination during transit. Durable material, such as clean wood, bubble wraps, or similar non-contaminating materials should be used to support and protect the components from one another during transit and storage.

The inner vessel shall feature a shipping restraint element to mitigate shipping related stresses at the bottom of the vessel. If this element is designed for removal after shipment. Instruction on how to perform the procedure should be provided.

The inner vessel and piping shall be pressurized to 5 psig with dry nitrogen gas for shipment. The

SELLER shall notify the BUYER of the gauge pressure of the pressurized vessel and piping before the shipment.

Packaging must have the weight and location of the center of gravity clearly identified.

The SELLER will provide a shock indicator to monitor the DEWAR during transportation.

6.5 Quality Assurance Requirements

The DEWAR shall be designed and manufactured in accordance with generally applied quality programs, standards and techniques.

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6.6 Safety

The DEWAR shall be designed and manufactured in accordance with generally applied safety standards and techniques.

7 DOCUMENTATION

7.1 Fabrication

The SELLER shall furnish electronic and paper copies of ASME U-1A Manufacturer’s Data Report.

The SELLER shall furnish electronic and paper copies of the vacuum vessel welding WPS, PQR, and WPQ documentation. Exception applies if the vacuum vessel is Code-stamped per 5.4.1 alternative. Certification that the vessel was fabricated in a ASME code shop and proof of quality assurance and quality check can be substituted for the welding documentation.

The SELLER shall furnish electronic copies of the pipe welding WPS, PQR, WPQ, and welding inspection documentation. See section 5.5.1 for alternative.

7.2 Design

The SELLER shall furnish electronic copies of engineering and design information for the DEWAR and its components, including but not limited to:

a. Relief valve sizing calculation.

b. Vacuum vessel calculations if the vacuum vessel is not Code stamped per 5.4.

c. Piping design calculations per ASME B31.3.

7.3 Drawings, Diagrams, Procedures, Specifications, etc.

The SELLER shall furnish a piping schematic with named reference to each valve, instrument, and interface.

The SELLER shall furnish a general layout drawing of the DEWAR showing major dimensions, weights, floor contact details (feet size, location and anchor holes), connections and pipe sizes referenced to schematic.

The SELLER shall furnish Operation Instructions and the Maintenance Manual for the DEWAR.

The SELLER shall furnish installation and erection specifications and lifting information for the

DEWAR and its components. Shipping restraint removal procedure, if applicable.

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The SELLER shall furnish quality control reports, including but not limited to:

a. Test equipment calibration reports.

b. Helium Leak check test reports.

c. Pressure test reports.

7.4 Other

The Dewar shall have an ASME U nameplate mounted on the outside of the insulating vacuum cryostat. The insulating vacuum jacket shall also have a similar nameplate but is only required to have a U-stamp if option 6.4.1(A) of this specification is selected by the SELLER.

The SELLER shall furnish ASME B31.3 compliance certificate(s) covering all process piping circuits. The compliance certificate is a self-declaration that the piping systems conform to all

ASME B31.3 requirements.

The SELLER shall furnish all documents written in the English language.

All calculations and analysis performed using computer software shall be submitted in Portable

Document Format (PDF).

Documents with handwritten entries shall be scanned and submitted in the Portable Document

Format (PDF).

All other electronically generated documents shall be supplied in Microsoft Office format.

8 WARRANTY

8.1 The warranty period of the DEWAR shall be no less than 12 months and begin after the successful conclusion of the performance acceptance test. See section 10 for performance acceptance test details.

8.2 The BUYER will notify the SELLER upon completion of the performance acceptance test.

8.3 The BUYER has no less than six months to complete the performance acceptance test after receiving the equipment.

9 OPTIONAL ITEMS

9.1 The DEWAR shall feature a 24V, 4-20mA Rosemount differential pressure transmitter sized to measure the vessel fill level.

9.2 The DEWAR shall feature a 24V, 4-20mA Rosemount pressure transmitter sized to measure the ullage gas pressure.

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9.3 Manufacturer and part number of each device shall be approved by BUYER.

9.4 Truck Filling over-pressure device: Dewar shall be supplied without a truck filling over-pressure protection valve.

10 Performance Acceptance Test

The following section covers testing the VESSEL, piping, and components once received from the SELLER.

Each component will be tested, and results of the test documented. Exact list of components and procedures for the testing will be developed after procurement of the VESSEL and after receiving the piping and instrumentation diagram, as well as the valve and instrument list.

10.1 Warm Tests

10.1.1. Vessels and Piping

10.1.1.1. Verify positive pressure of 5 psig in the inner vessel and piping as required by section 6.4.5.

10.1.1.2. Visual examination of all exposed piping and welds and overall condition of piping. Any cracks, holes, or damage on the piping will be marked and documented.

10.1.1.3. Verify vacuum in the outer shell is 1E-3 torr or better.

10.1.1.4. Visual examination of outer shell for overall condition. Any cracks/chips in paint will be marked and documented. Any suspect welds will be marked.

10.1.2. Instrumentation

10.1.2.1. Single pressure transmitters

10.1.2.1.1. Connect power to the transmitter. Verify that the transmitter turns out correctly. Tag and document any transmitter that does not power on.

10.1.2.1.2. Verify zero set point gauges if applicable. If piping and/or vessel are still pressurized to 5 psig as per section 6.4.5, verify gauges read 5 psig.

10.1.2.1.3. Document any devices that read outside of expected values.

10.1.2.1.4. Testing transducer range will occur during first cooldown and fill of

VESSEL.

10.1.2.2. Single pressure gauges

10.1.2.2.1. Verify zero set point of gauges if applicable. If piping and/or vessel are still pressurized to 5 psig as per section 6.4.5, verify gauges read 5 psig.

10.1.2.2.2. Record and tag all initial readouts on the device.

10.1.2.2.3. Document any devices that read outside of expected values.

10.1.2.2.4. Testing gauge range will occur during first cooldown and fill of VESSEL.

10.1.2.3. Differential pressure transmitters

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10.1.2.3.1. Connect power to the transmitter. Verify that the transmitter turns out correctly. Tag and document any transmitter that does not power on.

10.1.2.3.2. Verify zero readout of transmitters. Open all block and bleed valves associated with the differential pressure gauge. Verify that the readout is 0 psid. Document and tag any devices that do not indicate zero and have a zero-set point issue.

10.1.2.3.3. Record and tag all initial readouts on the device.

10.1.2.3.4. Document any devices that read outside of expected values.

10.1.2.3.5. Configure block and bleed valves to normal operating positions. Testing transducer range will occur during first cooldown and fill of VESSEL.

10.1.2.4. Differential pressure gauges

10.1.2.4.1. Open all block and bleed valves associated with the differential pressure gauge. Verify that the readout is 0 psid. Document and tag any devices that do not indicate zero and have a zero-set point issue.

10.1.2.4.2. Configure block and bleed valves to normal operating positions. Testing gauge range will occur during first cooldown and fill of VESSEL.

10.1.2.5. Vacuum pressure transducers

10.1.2.5.1. Connect power to the transmitter. Verify that the transmitter turns out correctly. Tag and document any transmitter that does not power on.

10.1.3. Valves

10.1.3.1. All valves on the VESSEL and associated piping will be cycled to ensure proper operation. Any valves that do not function as intended will be tagged and documented.

10.1.3.2. The piping will be pressurized to 50 psig in independent sections to ensure sound shutoff of each valve. Any valves that experience leak through the valve seat or out of the valve stem will be tagged and documented. Exact procedure will be developed after procurement of VESSEL and receipt of piping and instrument diagram.

10.1.3.3. Verify pressure vessel relief valves are ASME code stamped. Confirm set pressure of 135 psig.

10.1.3.4. Verify rupture disks are ASME code stamped. Confirm set pressure of 165 psig.

10.1.3.5. Verify that all valves are labeled with tag names and, when appropriate, descriptive tags. Mark any components not missing labels on the piping and instrumentation diagram.

10.2. General

10.2.1. Verify that the piping and instrumentation diagram, valve and instrument list, and received components match. Document and tag anything that is missing.

10.2.2. Confirm lifting lug placement on outer vessel/shell is correct and center of gravity is indicated.

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10.2.3. Upon receiving the VESSEL, verify that all components have been wrapped/protected from damage during transportation. Tag and document anything that was not protected or was damaged upon arrival.

10.2.4. Upon receiving the VESSEL, verify that all open pipe ends are plugged/capped/covered. Tag and document any open sections.

10.2.5. Verify the VESSEL is marked with a U-stamp.

10.2.6. Check that all shock indicators are within acceptable range.

10.2.7. Confirm vessel is labeled with piping and instrumentation diagram.

10.2.8. Confirm all possible trapped volume locations are protected with trapped volume relief valves. Mark any areas not protected on the piping and instrumentation diagram.

10.3. Cold Tests – After First Cooldown and Fill of Liquid Nitrogen

10.3.1. With supply valves closed, monitor VESSEL boiloff rate over a four-day period. Confirm loss rate is less than specified in section 5.6.10.

10.3.2. Confirm the operational ranges for the pressure gauges and transducer while cold. Each gauge and transducer should be functioning as normal. Document any instrumentation that does not read correct while cold.

10.3.3. With supply valves closed, confirm the VESSEL pressure is maintained between 90 psig and 110 psig as defined in section 5.5.2 above. Document any deviation outside of this range.

10.3.4. With supply valves closed, confirm that there are no ice balls or frost between the outer vacuum shell and the piping penetrating the vacuum shell. Mark cold spot locations on the tank and/or the piping and instrumentation diagram.

11 Appendix. Technical Questionnaire

This Technical Questionnaire will be used to evaluate a potential SELLER’s capabilities to engineer, design, and manufacture the MC-1 LN2 Dewar and furnish safety and quality control documentation according to this EDS. Brief descriptions are requested on the topics below. Example and reference from previous LN2 bulk storage tank may be used to substitute for direct answers, where appropriate. Given requirements in the Engineering Design Specification ED0013961, please answer the following questions:

11.1 ORGANIZATION AND PAST HISTORY

Please provide a detailed description of your production capacities including but not limited to your fabrication facilities location, available shop space, equipment, machines, etc.

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Please provide a list of the key technical staff with each individual’s relevant capabilities, expertise, and experience. Each individual shall have a history of sufficient experience to perform the work required by the specification.

Please provide references and examples of successful history of manufacturing this DEWAR model specifically or similar DEWARS.

Do you plan on outsourcing key elements of the design and or fabrication? If yes, please describe what elements and to whom.

11.2 CODES AND CALCULATIONS

Provide a list of the SELLER's CODE certification marks and other CODE-based qualifications or certifications that may be applicable to the design, fabrication, inspection, examination, and/or testing of the DEWAR.

Please describe your approach on how to comply with ASME BPVC.

Please describe your approach on how to comply with ASME B31.3 Process Piping Code and specifically on how it applies to cryogenic service.

Please describe your approach and capability of performing in-process and radiographic examination as well as pressure testing per ASME Section VIII and ASME B31.3.

Please describe your approach on how to comply with seismic requirements.

Please describe the various calculation tools that you typically use:

a. Vacuum and pressure vessel analysis.

b. Piping flexibility.

c. Finite element analysis.

d. Heat leak analysis.

e. Other analysis tools that you may use.

Please provide an example of an engineering analysis document for a LN2 bulk tank of similar complexity.

11.3 FABRICATION TECHNIQUES

Please describe your approach to relieving thermal stress on internal lines.

Do you perform a flexibility analysis and if yes, how is this typically performed?

Please describe the type of multi-layer insulation (MLI) that will be used.

Briefly describe the MLI application technique.

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Please describe your helium leak detection (mass spectrometer) equipment and associated calibration program.

11.4 Others

Please provide an example shipping plan for supporting, crating, and shipping a dewar of similar complexity, weight, and size.

Please provide an example of concrete pad design for supporting the DEWAR.

Provide a price quote for the total cost to furnish all facilities, equipment, special tooling, consumables, and material, except where explicitly excluded in this specification, and cost to perform all work and services necessary to engineer, design, fabricate, assemble, test and deliver to the BUYER’s site a fully functional DEWAR.

Please provide a list of exceptions to this technical specification and the reasoning for the exceptions.