J-5 General Requirements Circulation_Pump_Unit_Functional_Requirements-Final Feb 22 2024.pdf

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US

LBNF/DUNE-US

Main LAr Circulation Pump Units Functional Requirements

Document Number: EDMS 3048170 v.1

Liquid Argon Condenser Pumps 1 - Functional Requirements - Rev. 1

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page ii

Document Approvals

Signatures Required Signature & Date Approved

Originator:

Zachery West / Roza Doubnik Cryogenic Engineer

01.18.2024

Approver:

David Montanari, LBNF FDC Deputy Project Manager for Cryogenics

Approver:

Approver:

Approver:

Approver:

Revision History and Version Control

This version of the document may not be the current or approved revision. The current revision is maintained in the Engineering & Equipment Data Management Service (EDMS) where internal Project document approvals are managed. EDMS can be accessed through the web at https://edms.cern.ch. This document can be identified by the revision date as indicated in the Version Control Table below.

The currently approved version is always available at: https://edms.cern.ch/document/3048170/1

Author Revision Date Location EDMS Description of Changes

Zachery West / Roza Doubnik 01/18/2024 EDMS 3048170 v.1 Original Document https://edms.cern.ch/

Functional Requirements

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page iii

Document Approvals .................................................................................................................................... ii

Revision History and Version Control ........................................................................................................... ii

List of Figures ............................................................................................................................................... iii

List of Tables ................................................................................................................................................ iii

1 Scope of Document ........................................................................................................................ 1-1

2 Circulation Pump Unit Current Interface Requirements ............................................................... 2-1

3 Circulation Pump Technical Requirements .................................................................................... 3-2

4 Modes of Operation for Circulation Pumps Units.......................................................................... 4-2

5 Appendix A – Design Parameters and Tables ................................................................................ 5-4

List of Figures

Figure 2-1: Current Circulation Pump Unit Skid to Cryostat Typical Configuration (To be checked) ........ 2-1

List of Tables

Table 6-1: Design Parameters .................................................................................................................... 5-4 Table 6-2: Upstream Piping Pressure Drop Limitations [2]........................................................................ 5-4 Table 6-3: Modes of Operations ................................................................................................................ 5-4

Functional Requirements List of Tables

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1 Scope of Document This document describes the functional requirements for the Long-Baseline Neutrino Facility (LBNF) main Liquid Argon Circulation Pump Units for Cryostats 1 and 2.

2 Circulation Pump Unit Current Interface Requirements The current Circulation Pump Units to the Cryostats shall be located inside spaces allocated in the North / South Detector Cavern envelopes where four (4) pumps are divided into two (2) groups with two (2) pumps on each, see Figure 2-1 below. This configuration is to be check against the final configuration.

Figure 2-1: Current Circulation Pump Unit Skid to Cryostat Typical Configuration (To be checked)

The current configuration is highlighted in Figure 2-2 below. The red highlighted section is the pumps themselves that show the 4 (four) circulation pumps that come off the cryostat. The yellow highlighted sections are the upstream piping that is made of 4” vacuum jacketed piping. The green highlighted sections are the downstream piping that is made of 4” vacuum jacketed piping. The blue highlighted section is the 6” vacuum jacketed manifold that connects all four of the downstream piping streams. This outlet will also merge with the common outlet coming out of the condenser system. The combined flow goes to the CUC.

GROUP 1

GROUP 2

CRYOSTAT 1 WEST SIDE

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page 4-2

Figure 2-2: P&ID of Current Configuration of Circulation Pumps (to be checked)

3 Circulation Pump Technical Requirements

3.1 The liquid argon pumps shall be designed for internal vacuum and for a pressure of 10 bar and shall be suitable for handling argon flows at any temperature ranging from about 310 K to about 87 K (for the cool-down and warm-up processes).

3.2 The liquid argon pumps shall each have an adiabatic efficiency higher than 0.5.

4 Modes of Operation for Circulation Pumps Units The Circulation Pumps units defined in this Functional Requirements document will be used for the following modes of operation:

1. Initial purge and cooldown.

2. Normal operation.

3. Bearings replacement.

4. Maintenance

5. Purge and standby mode.

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page 4-3

The current configuration uses 4 pumps in modular fashion. The functional parameters should dictate the optimal number of pumps and their characteristics as long as requirements are met. Redundancy shall be considered to ensure uninterrupted operations.

4.1 Supply Initial Purge and Cooldown

The Supply shall be cleaned up from air in the system, using cylinder argon gas for pump and backfilled of process line and pump space. After using pure argon from cryostat, purge the process lines and vent it, slowly cooldown the system.

4.2 Normal Operations

When the system is clean and cold, start the pump stepper based on pump manuals. Increase the pump speed to nominal. During Normal operations for Cryostat shall be sufficient to work with one pump. During the Cryostat Fill process four (4) pumps are running.

4.3 Bearing Replacement

Based on liquid argon pump manuals, each pump needs to replace bearings approximately each 6000 working hours. Supply shell be able to replace bearings on each pump without interruption of circulation process.

4.4 Maintenance

Any of the pump units shall be capable of being taken out of service for maintenance while any combination of the other units remains in operation. The pumps shall be divided into two operational groups (Pump Group 1 and Pump Group 2), representing pump units, and shall work under the same conditions.

4.5 Supply purge and standby mode

After pumps bearing replacement all process lines shall be pulled in vacuum and cleaned with argon gas from cylinder first and backfilled from working pump common manifold. System shall be ready to operate.

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page 5-4

5 Appendix A – Design Parameters and Tables The main design parameters are listed below in Table 6-1.

Table 6-1: Design Parameters

Equipment

MAWP

psig/ bar Design Temperatures

Minimum/Maximum K (°C) Adiabatic Efficiency

Liquid Argon Circulation Pump Unit

130.5/9 85K (-188.15°C) / 320K (46.85°C) > 0.5

Table 6-2: Upstream Piping Pressure Drop Limitations [2]

Supply Scope Max Flow per unit lb/min (kg/s) Function Max Pressure Drop psi

(mbar)

LAr piping 5292 (40) Transfer the LAr 1.1 (75.8)

Table 6-3: Modes of Operations

Operation Mode Flow lb/min (kg/s)

Cryostat Fill Process 5292 (40)

Normal Operations 1323 (10)/2645 (20)

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Table 6-4: BNI’s LAr Pumps Operating Point

Operating point Units 1 - Full 2 – Fill/Empty

Inlet Pressure bara 1.21 1.21

Inlet Pressure mbarg 200 200

Fluid Height m 13.0 2.0

Inlet Temperature K 88.0 88.0

Delta - P bard 8.00 8.00

Discharge Pressure bara 9.21 9.21

Mass Flow Rate kg/s 10.0 10.0

Volumetric Flow Rate l/s 7.2 7.2

Operating Speed rpm 3000 3000

Net Positive Suction Head Available m 13.9 2.9

Net Positive Suction Head Required m 1.0 1.0

Estimated Pump Shaft Power kW 10.15 10.15

Estimated Electrical Input Power kW 11.67 11.67

5 Appendix A – Design Parameters and Tables