446572 - RFQ_Q and A_Round 1_02-03-2025.pdf

PDF 591 KB Posted Feb 3, 2025

Attached to: Liquid He Dewar and Sub-Cooler
Solicitation number: 446572
Issued by: Department of Energy Office of Science

About this file

Written by GovTribe AI · Feb 4, 2025

This is a Questions and Answers document (Round 1) for Request for Quote #446572 for a Liquid Helium Dewar and Sub-Cooler, dated February 3, 2025. The document contains 17 technical questions and answers related to specifications SPEC-CAD-1365, clarifying requirements for components, testing, and design parameters.

Key clarifications include: component documentation requirements apply to all end items including the Dewar and instruments; test labs are considered subcontractors only if testing the full Dewar; specifications for 1kW low flux density heaters from Kelvin Technologies; valve specifications allowing either C2000 or C3000 series and globe valve configurations; requirements for metal seat seals on vacuum ports; pressure gauge specifications; ANSI flange requirements; and temperature sensor mounting details. The document includes a P&ID drawing showing the system configuration and technical details like the 3800L capacity, ASME code requirements, and operating parameters including 4.5 bar MAWP and 4K minimum design temperature.

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QUESTIONS AND ANSWERS

REQUEST FOR QUOTE NUMBER 446572

LIQUID HE DEWAR AND SUB-COOLER

ROUND 1

FEBRUARY 3, 2025

# QUESTIONS ANSWERS

1 SOW Paragraph 3.11.4: Is “component documentation” and “specification sheet” referring to the end item itself, or to installed components on the end item?

Yes, the “component documentation” and “specification sheet” referring to the end items (e.g. all the components like Dewar, all the instruments, valves etc.) itself.

2 SOW Paragraph 4.3: Is a test lab considered to be a subcontractor?

If test lab is being used for any material testing, then the test lab is not subcontractor. If the Dewar is going to be tested with separate entity it is subcontractor.

3 SPEC-CAD-1365 Paragraph 1.3.b: Are the 1 kW heaters of the low flux density type offered by Kelvin Technologies?

Yes, it is a 1kW heater of the low flux density type offered by Kelvin Technologies.

4 SPEC-CAD-1365 Paragraph 3.2.11: With a heat leak on the order of 1.5 W, the C2000 series valve is not typically thought of as a high efficiency valve for critical helium service. The C3000 may be a better choice if thermal performance is a priority. I am having difficulty locating this valve on the P & ID. Can you assist me?

Yes, it is Contractor’s choice use C2000 or C3000. It is to be noted that the cooldown return valve is not part of 4K circuit. The cooldown return valve is going to ambient vaporizer as per P&ID (see attached P&ID). We have made correction in the P&ID for showing proper connection to Dewar Neck.

5 SPEC-CAD-1365 Paragraph 3.2.17 & 18: As we are anticipating a revision to a C3000 series or perhaps another choice with an extended heat path stem, our approach would be to bury the valve in the vacuum space in order to keep the overall height of the dewar from becoming prohibitive. Given this, a “Y” pattern valve would no longer be compatible. A globe pattern is better suited.

Yes, the Contractor can use their proposed configuration using a globe valve.

6 SPEC-CAD-1365 Paragraph 3.2 Vacuum Ports:

What is the rationale for the specification of metal seat seals? Might elastomer seals be a more reliable choice?

It is a BSA specification requirements and based on experience that the metal seat seals vacuum valves provide vacuum leak tightness as good as elastomer seat seal with lesser diffusion for Helium.

7 SPEC-CAD-1365 Paragraph 3.3.4: What is the size and configuration of the pressure gauges that BSA will provide? For the main reservoir, 2.5” ¼” CBM is preferred while for the chiller circuit, 1.5” 1/8” CBM may work well.

Kindly refer the section 3.14.2. The pressure gauges shall be provided by the Contractor.

LIQUID HE DEWAR AND SUB-COOLER

8 SPEC-CAD-1365 Paragraph 3.3.9: What does this device look like?

Kindly refer to the attached image for the mass flow controller. This is parallel to the flow meter which will be provided by the Contractor.

9 SPEC-CAD-1365 Paragraph 3.10: What is meant by interconnecting piping? Example?

Any extra connections through piping of pressure vessel (LHe dewar), shall be interconnecting piping. E.g. tubing run between Dewar neck and differential pressure sensor, tubing run between dewar neck and flow controller etc. Kindly refer the P&ID.

10 SPEC-CAD-1365 Paragraph 3.14.1: I had an impression that the hard mounts for the temperature sensors would be provided by BSA. Is that the case?

Yes, your understanding is correct. BSA will provide hard mount.

11 SPEC-CAD-1365 Paragraph 3.14.1: Are the thermal isolation pads to be used in lieu of thermal anchoring of the temperature leads?

Yes, the thermal isolation pads to be used.

SPEC-CAD-1365 Paragraph 3.14.2: What is the special interface being contemplated for the pressure transmitters?

A ¼” tube pressure tap with manual isolation valve shall be provided as well as a fitting to connect to the pressure sensor. The fitting shall have a male SAE/MS O-Seal straight thread connector of 7/16”-20 size to receive the female thread on the pressure sensor.

13 SPEC-CAD-1365 Paragraph 4.5: In the first sentence, what is the purpose and location of the conflat flange that is mentioned?

Yes, the purpose of 4.5” conflat flange is to pump the vessel and 2.5” conflat flange is used for the vacuum gauges for measurement as per P&ID. Kindly refer the below image.

Location: Preferred height of pumping port (4.5”) is around 3 feet from the bottom of vessel whereas vacuum gauges port should be on top of vessel.

LIQUID HE DEWAR AND SUB-COOLER

14 SPEC-CAD-1365 Paragraph 4.8.2: This may seem like a fairly benign requirement but an across-the-board mandate for bellows sealed valves will add multiple thousands of dollars to the price. Is this a necessity?

It is the BSA requirements as per specification.

15 SPEC-CAD-1365 Paragraph 4.9.1: As ANSI flanges are fairly bulky and since there is minimal pressure in the downstream exhaust of the relief valves, would an ANSI patterned low pressure flange be an acceptable alternate?

The Contractor has to use ANSI flanges that meet the design pressure requirements.

16 SPEC-CAD-1365 Paragraph 4.10: For localized bending stresses which are self-limiting, a 3:1 safety factor relative to yield may be overly conservative.

Our traditional reference recommends the yield strength for the maximum. Otherwise, the head thickness will need to be excessively increased from ¼” to 3/8”, unnecessarily increasing cost.

The safety factor of 3 relative to the yield value of the material is BSA requirement. The Contractor can weld reinforcing pads to the Dewar wall for attaching the lifting lugs.

17 SPEC-CAD-1365 Not Otherwise Specified: The P & ID shows (2) temperature sensors located inside the LHe reservoir. Are these described elsewhere in the specification? What is their nature and purpose?

As per the specifications, both the temperature sensors should be provided by BSA, and it is to be mounted by the Contractor on the redundant set of 1kw heater. The temperature sensor scope is mentioned in SPEC-CAD-1365 section 1.3, 1b. The sensors are there for over temperature protection of heater.

DWR-0001

LIQUID HELIUM DEWAR, 3800 LITER

INNER VESSEL: ASME BPVC VIII DIV-1

ASME U-Stamped, MAWP: 4.5bar & FULL VACUUM @322K, MDMT: 4K@ 4.5bar

OUTER VACUUM VESSEL:

ASME U-Stamped,MAWP: FULL VACUUM@322K. MDMT 244K @ -1.013 bar (EXTERNAL)

D-BC-4D-BC-L1/V1

SUBCOOLER

EHTR-1/2

1000W, 200VDC

SUBCOOLER COIL

ASME B31.3 MAWP: 15 bar & FULL VACUUM @322K, MDMT: 4K@ 15bar

REFRIGERATION MODE: 50 G/S

LIQUEFACTION MODE WITH EXTRA ASSISTS [DEWAR DRAWDOWN].

ASSIST FROM PISTON PLANT

D-BC-3D-BC-2

COLLIDER-ACCELERATOR DEPARTMENT

BROOKHAVEN NATIONAL LABORATORY

UPTON, N.Y. 11973

AUTOCAD

THIS INFORMATION IS CONTROLLED BY THE

U.S. DEPARTMENT OF COMMERCE EXPORT

CONTROL ADMINISTRATION REGULATIONS

15 CFR PARTS 730-774 AS EAR99 TECHNOLOGY

APPROVED

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