A. Specification ED0049128 CM Relief Valves.pdf
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This is a technical specification for cryogenic reclosable pressure safety relief valves required for the PIP-II accelerator project at Fermi National Accelerator Laboratory (FERMILAB).
FERMILAB is procuring twenty-five (25) cryogenic relief valves for the Proton Improvement Plan II (PIP-II) linear accelerator, which uses superconducting radio frequency (SRF) cryomodules requiring cryogenic helium for operation. The valves are required in three configurations: six valves (SV-nn21, nn=20-25) with 3" inlet/4" outlet flanges rated for 270 g/s helium flow; eighteen valves (SV-nn21, nn=02-19) with 3" inlet/4" outlet flanges rated for 209 g/s flow; and one valve (SV-nn21, nn=01) with 3" inlet/1" outlet flanges rated for 93 g/s flow. All valves must operate at sub-atmospheric cryogenic conditions (approximately 30 mbar absolute pressure and 2 K/-459°F), with a relief set pressure of 1.05 barg and 10% allowable overpressure. Valves must be ASME Section VIII Code NB/UV stamped, constructed with KEL-F (PCTFE) seats for radiation tolerance and reliable sealing, use EPDM o-ring static seals, comply with API 527 seat sealing standards and API 526 valve body geometry, feature balanced bellows operation, and include provisions for in-situ testing. Vendors must submit total cost, delivery schedule, technical specifications including rated capacity, orifice size calculations, drawings, flange descriptions, material details, seat performance data relative to API 527, and ASME certification verification with their proposals. Upon delivery, vendors must provide a Certificate of Compliance with ASME Section VIII and National Board certificates, mill/material traceability reports, and set pressure certification. FERMILAB will conduct incoming quality checks within two weeks of receipt, including visual inspections and verification of nameplate specifications and mechanical interfaces.
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PIP-II Cryogenic Distribution System
ED0049128 – CM 2K Reclosable Pressure Safety Relief Valves Specification
PIP-II Cryogenic Distribution System ED0049128 CM 2K Reclosable Pressure Safety Relief Valves specification
Fermi National Accelerator Laboratory 2
Document Approval Signatures Required Date Approved
Originator: William Soyars, CDS engineer As in Teamcenter
Reviewer: Vrushank Patel, PIP-II L3M for CDS As in Teamcenter
Reviewer: Alex Martinez, PIP-II CAM for CDS As in Teamcenter
Reviewer: Matt Luedke, PIP-II Quality Assurance As in Teamcenter
Reviewer: Jeremy Nudell, PIP-II Project Engineer As in Teamcenter
Approver: Joe Ozelis PIP-II L2 for SRFCryo As in Teamcenter
Revision History Revision Date Released Description
- 8/26/2026 Initial release
PIP-II Cryogenic Distribution System ED0049128 CM 2K Reclosable Pressure Safety Relief Valves specification
Fermi National Accelerator Laboratory 3
1. Introduction and Scope 4
2. Acronyms 5
3. Cryogenic Relief Valve specific technical requirements 6
4. Additional technical requirements, information, and clarifications 8
5. In-situ testing provisions 8
6. Labelling 10
7. Transportation and handling 10
8. Document deliverables 10
9. In-coming Quality Check and Acceptance by FNAL 11
PIP-II Cryogenic Distribution System ED0049128 CM 2K Reclosable Pressure Safety Relief Valves specification
Fermi National Accelerator Laboratory 4
1. Introduction and Scope
1.1. PIP II Cryomodule (CM) Relief System
1.1.1. Fermi National Accelerator Laboratory (FERMILAB) located in Batavia, IL is building a next generation proton accelerator called the Proton Improvement Plan II (PIP-II). The
PIP-II accelerator (Linac) design is based on superconducting radio frequency (SRF) technology employed in up to twenty-five SRF cryomodules (CM). The linac requires cryogenic helium for operation. Figure 1.1 presents a schematic overview of the PIP-II
CM relief system. The linac cryomodules (CMs) are equipped to protect accelerator components from overpressure. There are 25 CMs in the accelerator tunnel. The reliefs are circled in Figure 1.1. The process line normally operates at sub-atmospheric cryogenic conditions, about 30 mbar absolute pressure and 2 K (-459 oF).
Figure 1-1 PIP-II Relief System, with Cryomodule pressure relief valve indicated
PIP-II Cryogenic Distribution System ED0049128 CM 2K Reclosable Pressure Safety Relief Valves specification
Fermi National Accelerator Laboratory 5
1.2. Scope and Quantity
1.2.1. This specification is for cryogenic reclosable relief valves on the Cryomodules (CM) helium bath volume.
1.2.2. Twenty-five relief valves are required. Details to follow.
2. Acronyms
2.1.1. Technical acronyms
CDS Cryogenic Distribution System CM Cryomodule (a proton beam accelerator cryogenic control valves) He Helium
2.1.2. Organizational Acronyms
ANSI American National Standards Institute API American Petroleum Institute ASME American Society of Mechanical Engineering BPVC Boiler and Pressure Vessel Code PIP-II Proton Improvement Plan II FERMILAB Fermi National Accelerator Laboratory
2.2. Definitions
AMBIENT a term used to define nominal environmental conditions, unless otherwise specified, of atmospheric pressure
RELIEF VALVES a term used to refer collectively to Cryogenic Pressure Safety Relief Valve assemblies to be procured for installation on the Cryomodules
VENDOR a term used to refer to the designer, fabricator, and supplier of the CRYOGENIC
RELIEF VALVES
CODE a term used to refer collectively to the various pressure safety standards to which the CRYOGENIC RELIEF VALVES shall comply.
Linac a term that indicates a set of SRF cryomodules connected in series.
May a term which indicates that a provision is neither required nor prohibited
Shall a term which indicates that a provision is a requirement
Should a term which indicates that a provision is recommended as good practice but is not a requirement
PIP-II Cryogenic Distribution System ED0049128 CM 2K Reclosable Pressure Safety Relief Valves specification
Fermi National Accelerator Laboratory 6
3. Cryogenic Relief Valve specific technical requirements
3.1. Twenty-five reclosable pressure safety relief valves are required. Details of Pressure Relief Valves on Cryomodules (CM 2K) are given in Table 3-1.
Table 3-1 Pressure Relief Valves for Cryomodules (CM 2K) (nn = 1-25)
FERMILAB Tag ID SV-nn21 SV-nn21 SV-nn21
Identification number nn=20-25 nn=02-19 nn=01
Fluid helium helium helium
Required valve quantity 6 18 1
Connecting pipe flange, inlet 3”
CL 150
Flat face
3”
CL 150
Flat face
3”
CL 150
Flat face
Connecting pipe flange, outlet 4”
CL 150
Raised face
4”
CL 150
Raised face
1”
CL 150
Raised face Min Design Metal Temp [K] 4 4 4 Operating pressure [barg] -0.97 -0.97 -0.97 Relief set pressure [barg] 1.05 1.05 1.05 Allowable overpressure 10% 10% 10% Relieving temperature 294 K 294 K 294 K Required flow rate [helium gas g/s] 270 209 93 Required flow rate [scfm air] 1213 939 418 Maximum allowed flow rate [helium gas g/s] 350 250 250
Expected Required orifice area.
assuming KD=0.975 [in2] 2.358 1.825 0.812
Expected orifice selection Choose API-L orifice
Choose API-K orifice
Choose API-J or API-K orifice
Seat material KEL-F (PCTFE) KEL-F (PCTFE) KEL-F (PCTFE)
Process nominally at sub atmospheric press Yes Yes Yes
Superimposed backpressure at outlet, worst case [barg] (See 4.3.4) 0.5 0.5 0.5
Spring operation style Balanced bellows
Balanced bellows
Balanced bellows
PIP-II Cryogenic Distribution System ED0049128 CM 2K Reclosable Pressure Safety Relief Valves specification
Fermi National Accelerator Laboratory 7
3.2. The RELIEF VALVES shall be ASME Section VIII Code NB/UV stamped.
3.3. The RELIEF VALVES shall be for cryogenic helium service.
3.4. The RELIEF VALVES shall have flange connections as described in Table 3-1.
3.4.1. The relief valve inlet will normally operate in process lines with sub-atmospheric service as noted in Table 4-1 and will use double o-ring connection with the mating flange on the process pipe.
3.4.2. The inlet flange shall have a surface finish of 32 RA, suitable surface finish for mating to flange with o-rings,
3.4.3. The relief outlet will mate to a raised face flange using a gasket.
3.5. The RELIEF VALVES shall operate in an indoor environment, within the linear accelerator tunnel.
3.6. The RELIEF VALVES shall be constructed using materials that are radiation tolerant and operate without degradation or valve performance deterioration.
3.7. The RELIEF VALVES shall use KEL-F (PCTFE) seat for radiation tolerance and reliable sealing.
3.7.1. The process line normally operates at sub-atmospheric cryogenic conditions, about 30 mbar absolute pressure and 2 K (-459 oF), . The relief exhaust header is helium at room temperature. Any in-leak of room temperature helium through the closed relief will introduce heat leak to 2K, a temperature level for which heat leak is very costly. Thus, to minimize this heat leak, a soft seat is specified.
3.7.2. After recovery from a relieving event, the valve needs to reliably seal to avoid heat leak.
3.8. Static seal material (o-ring) shall use EPDM.
3.9. Seat sealing leak tightness shall meet or exceed API 527 standard. Functional tightness in excess of API standards is preferred and will be evaluated favorably.
3.10. Valve Body geometry shall comply with API 526. Deviations from center-to-face dimensions of inlet and outlet flanges may be proposed subject to FERMILAB review for acceptability.
PIP-II Cryogenic Distribution System ED0049128 CM 2K Reclosable Pressure Safety Relief Valves specification
Fermi National Accelerator Laboratory 8
4. Additional technical requirements, information, and clarifications
4.1. The maximum allowed relief capacity shown in Table 4-1 is determined to meet the inlet pressure drop criteria on the piping system. This is based on ASME BPVC.VIII.1 non-mandatory Appendix M-6 or API 520 Part II pressure relief inlet pressure drop requirements.
Higher capacity valves may be proposed but would be subject to FERMILAB review for acceptability.
4.2. The backpressure is worst case, considering peak exhaust piping reservoir pressure.
4.3. Orifice sizing with the assumed discharge coefficient is intended to be consistent with the required and maximum allowable flow rate. These are presented for guidance, and the vendor shall conduct their own sizing. Calculations for the tables use HePak software (Horizon Technogies, formerly Cryodata) for helium properties. This references data from the U.S.
National Institute of Standards and Technology (NIST). The helium properties can be provided by FNAL upon request to aid vendor’s calculations.
4.4. Relief conditions in service occur at room temperature; however, the valves shall be designed to see cryogenic helium temperatures as shown in Table 4-1. At cryogenic conditions, a rupture disk at 3.1 barg serves as the primary relief device.
5. In-situ testing provisions
5.1. The pressure relief valve shall have provisions to be tested in-situ (in-place) to satisfy the relief device testing interval required by ASME BPVC.
5.2. Process conditions during in-situ relief testing.
5.2.1. Relief inlet process line will be at positive pressure conditions, a stand-by mode for the linac. Process Line pressure will be nominally at 3-4 psig and may be raised further during in-situ testing process, to nearer the relief set pressure, as required.
5.2.2. Relief exhaust back pressure test conditions will be at nominal 1 psig.
5.2.3. Fluid out of the vessel during any opening of the relief will be at about 10K. There is distance between the vessel, and the relief so small flows will warm up.
PIP-II Cryogenic Distribution System ED0049128 CM 2K Reclosable Pressure Safety Relief Valves specification
Fermi National Accelerator Laboratory 9
5.3. There is limited space between the relief inlet flange and the ceiling. The distance from inlet piping flange is 46.6 inches. See Figure 5-1. The estimated clearance with a 3” x 4” relief is about 17.5 inches.
5.4. Radial clearance between relief support posts and to the 8-inch header receiving exhaust flow is shown in Figure 5-2.
Figure 5-1 Clearance to ceiling during in-situ testing
Figure 5-2 Radial clearance during in-situ testing. Between support posts (L). To header piping (R)
PIP-II Cryogenic Distribution System ED0049128 CM 2K Reclosable Pressure Safety Relief Valves specification
Fermi National Accelerator Laboratory 10
6. Labelling
6.1. The valve body shall have label showing ASME code stamp, valve model, serial number, set pressure, capacity, orifice size and/or flow area, and temperature rating.
6.2. The valves shall be labeled with System Identification as shown in Table 3-1.
6.2.1. Six valves shall be labeled “SV-nn21 (nn=20-25)”.
6.2.2. Eighteen shall be labeled “SV-nn21 (nn=02-19)”.
6.2.3. One shall be labeled “SV-nn21 (nn=01)”.
7. Transportation and handling
7.1. The CRYOGENIC RELIEF VALVES shall be packed adequately for shipment to prevent any damage during transit to the FNAL site in Batavia, Illinois, USA.
7.2. Delivery at Place (DAP) to FNAL site in Batavia, Illinois, USA following Incoterms 2020 shall be used as the method of international shipping.
8. Document deliverables
8.1. The following items shall be submitted in English with the proposal. Information considered proprietary should be identified as such.
8.1.1. Total cost to fabricate, test, and ship to FNAL site in Batavia, Illinois fully functional Cryogenic Relief valves ready for installation.
8.1.2. Delivery schedule.
8.1.3. Lists of exceptions to this specification and reasoning for exceptions.
8.1.4. Technical details of the offered CRYOGENIC RELIEF VALVES covering:
PIP-II Cryogenic Distribution System ED0049128 CM 2K Reclosable Pressure Safety Relief Valves specification
Fermi National Accelerator Laboratory 11
8.1.4.1. Rated capacity and orifice size, including calculations and datasheets.
8.1.4.2. Drawings indicating dimensions.
8.1.4.3. Inlet and outlet flange size and description.
8.1.4.4. Seat description, static seals, and details of materials to be used for constructing the CRYOGENIC RELIEF
VALVES, pursuant to paragraphs 3.6, 3.7, and 3.8.
8.1.4.5. Seat sealing leak tightness performance relative to API 527.
8.1.4.6. Verify reliefs will have ASME Code certification.
8.1.4.7. Description of in-place testing provisions. Description of future service that could perform the testing.
8.2. The following items shall be submitted in English at the time of delivery to FNAL
8.2.1. Certificate of Compliance for the CRYOGENIC RELIEF VALVES stating compliance with ASME Section VIII with National Board certificates.
8.2.2. Mill/Material Traceability report
8.2.3. Set Pressure Certification
9. In-coming Quality Check and Acceptance by FNAL
9.1. Within two weeks upon receiving, FNAL will perform the following quality checks before accepting the CRYOGENIC RELIEF VALVES:
9.1.1. Visual inspections
9.1.2. Verification of name plate performance and serial number identifiers to the datasheets
9.1.3. Verification of mechanical size and interfaces to the drawings.
| 1. Introduction and Scope |
| 1.1. PIP II Cryomodule (CM) Relief System |
| 1.1.1. Fermi National Accelerator Laboratory (FERMILAB) located in Batavia, IL is building a next generation proton accelerator called the Proton Improvement Plan II (PIP-II). The PIP-II accelerator (Linac) design is based on superconducting radio fre... |
| 1.2. Scope and Quantity |
| 1.2.1. This specification is for cryogenic reclosable relief valves on the Cryomodules (CM) helium bath volume. |
| 1.2.2. Twenty-five relief valves are required. Details to follow. |
| 2. Acronyms |
| 2.1.1. Technical acronyms |
| 2.1.2. Organizational Acronyms |
| 2.2. Definitions |
| 3. Cryogenic Relief Valve specific technical requirements |
| 3.1. Twenty-five reclosable pressure safety relief valves are required. Details of Pressure Relief Valves on Cryomodules (CM 2K) are given in Table 3-1. |
| 3.2. The RELIEF VALVES shall be ASME Section VIII Code NB/UV stamped. |
| 3.3. The RELIEF VALVES shall be for cryogenic helium service. |
| 3.4. The RELIEF VALVES shall have flange connections as described in Table 3-1. |
| 3.4.1. The relief valve inlet will normally operate in process lines with sub-atmospheric service as noted in Table 4-1 and will use double o-ring connection with the mating flange on the process pipe. |
| 3.4.2. The inlet flange shall have a surface finish of 32 RA, suitable surface finish for mating to flange with o-rings, |
| 3.4.3. The relief outlet will mate to a raised face flange using a gasket. |
| 3.5. The RELIEF VALVES shall operate in an indoor environment, within the linear accelerator tunnel. |
| 3.6. The RELIEF VALVES shall be constructed using materials that are radiation tolerant and operate without degradation or valve performance deterioration. |
| 3.7. The RELIEF VALVES shall use KEL-F (PCTFE) seat for radiation tolerance and reliable sealing. |
| 3.7.1. The process line normally operates at sub-atmospheric cryogenic conditions, about 30 mbar absolute pressure and 2 K (-459 oF), . The relief exhaust header is helium at room temperature. Any in-leak of room temperature helium through the close... |
| 3.7.2. After recovery from a relieving event, the valve needs to reliably seal to avoid heat leak. |
| 3.8. Static seal material (o-ring) shall use EPDM. |
| 3.9. Seat sealing leak tightness shall meet or exceed API 527 standard. Functional tightness in excess of API standards is preferred and will be evaluated favorably. |
| 3.10. Valve Body geometry shall comply with API 526. Deviations from center-to-face dimensions of inlet and outlet flanges may be proposed subject to FERMILAB review for acceptability. |
| 4. Additional technical requirements, information, and clarifications |
| 4.1. The maximum allowed relief capacity shown in Table 4-1 is determined to meet the inlet pressure drop criteria on the piping system. This is based on ASME BPVC.VIII.1 non-mandatory Appendix M-6 or API 520 Part II pressure relief inlet pressure dr... |
| 4.2. The backpressure is worst case, considering peak exhaust piping reservoir pressure. |
| 4.3. Orifice sizing with the assumed discharge coefficient is intended to be consistent with the required and maximum allowable flow rate. These are presented for guidance, and the vendor shall conduct their own sizing. Calculations for the tables use... |
| 4.4. Relief conditions in service occur at room temperature; however, the valves shall be designed to see cryogenic helium temperatures as shown in Table 4-1. At cryogenic conditions, a rupture disk at 3.1 barg serves as the primary relief device. |
| 5. In-situ testing provisions |
| 5.1. The pressure relief valve shall have provisions to be tested in-situ (in-place) to satisfy the relief device testing interval required by ASME BPVC. |
| 5.2. Process conditions during in-situ relief testing. |
| 5.2.1. Relief inlet process line will be at positive pressure conditions, a stand-by mode for the linac. Process Line pressure will be nominally at 3-4 psig and may be raised further during in-situ testing process, to nearer the relief set pressure, a... |
| 5.2.2. Relief exhaust back pressure test conditions will be at nominal 1 psig. |
| 5.2.3. Fluid out of the vessel during any opening of the relief will be at about 10K. There is distance between the vessel, and the relief so small flows will warm up. |
| 5.3. There is limited space between the relief inlet flange and the ceiling. The distance from inlet piping flange is 46.6 inches. See Figure 5-1. The estimated clearance with a 3” x 4” relief is about 17.5 inches. |
| 5.4. Radial clearance between relief support posts and to the 8-inch header receiving exhaust flow is shown in Figure 5-2. |
| 6. Labelling |
| 6.1. The valve body shall have label showing ASME code stamp, valve model, serial number, set pressure, capacity, orifice size and/or flow area, and temperature rating. |
| 6.2. The valves shall be labeled with System Identification as shown in Table 3-1. |
| 6.2.1. Six valves shall be labeled “SV-nn21 (nn=20-25)”. |
| 6.2.2. Eighteen shall be labeled “SV-nn21 (nn=02-19)”. |
| 6.2.3. One shall be labeled “SV-nn21 (nn=01)”. |
| 7. Transportation and handling |
| 7.1. The CRYOGENIC RELIEF VALVES shall be packed adequately for shipment to prevent any damage during transit to the FNAL site in Batavia, Illinois, USA. |
| 7.2. Delivery at Place (DAP) to FNAL site in Batavia, Illinois, USA following Incoterms 2020 shall be used as the method of international shipping. |
| 8. Document deliverables |
| 8.1. The following items shall be submitted in English with the proposal. Information considered proprietary should be identified as such. |
| 8.1.1. Total cost to fabricate, test, and ship to FNAL site in Batavia, Illinois fully functional Cryogenic Relief valves ready for installation. |
| 8.1.2. Delivery schedule. |
| 8.1.3. Lists of exceptions to this specification and reasoning for exceptions. |
| 8.1.4. Technical details of the offered CRYOGENIC RELIEF VALVES covering: |
| 8.1.4.1. Rated capacity and orifice size, including calculations and datasheets. |
| 8.1.4.2. Drawings indicating dimensions. |
| 8.1.4.3. Inlet and outlet flange size and description. |
| 8.1.4.4. Seat description, static seals, and details of materials to be used for constructing the CRYOGENIC RELIEF VALVES, pursuant to paragraphs 3.6, 3.7, and 3.8. |
| 8.1.4.5. Seat sealing leak tightness performance relative to API 527. |
| 8.1.4.6. Verify reliefs will have ASME Code certification. |
| 8.1.4.7. Description of in-place testing provisions. Description of future service that could perform the testing. |
| 8.2. The following items shall be submitted in English at the time of delivery to FNAL |
| 8.2.1. Certificate of Compliance for the CRYOGENIC RELIEF VALVES stating compliance with ASME Section VIII with National Board certificates. |
| 8.2.2. Mill/Material Traceability report |
| 8.2.3. Set Pressure Certification |
| 9. In-coming Quality Check and Acceptance by FNAL |
| 9.1. Within two weeks upon receiving, FNAL will perform the following quality checks before accepting the CRYOGENIC RELIEF VALVES: |
| 9.1.1. Visual inspections |
| 9.1.2. Verification of name plate performance and serial number identifiers to the datasheets |
| 9.1.3. Verification of mechanical size and interfaces to the drawings. |
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