J-6 General Requirements Condenser_Pump_Unit_Functional_Requirements-Final Feb 22 2024.pdf

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

LBNF/DUNE-US

LAr Condenser Pump Units Functional Requirements

Document Number: EDMS 3048171 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/3048171/1

Author Revision Date Location EDMS Description of Changes

Zachery West / Roza Doubnik 01/18/2024 EDMS 3048171 v.1 Original Document https://edms.cern.ch/ https://edms.cern.ch/document/3048171/1

Functional Requirements

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

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

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

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

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

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

3 Condenser Pump Technical Requirements .................................................................................... 3-3

4 Modes of Operation for Condenser Pumps Units .......................................................................... 4-3

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

List of Figures

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

List of Tables

Table 5-1: Design Parameters .................................................................................................................... 5-4 Table 5-2: Required Flow per Condenser .................................................................................................. 5-4 Table 5-3: 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) Liquid Argon Condenser Pump Units for Cryostats 1 and 2.

2 Condenser Pump Unit Current Interface Requirements The LAr Condenser Pump units for the Cryostats shall be located inside spaces allocated in the North / South Detector Cavern envelopes where six (6) pumps are divided into one pump per condenser (see Figure 2-1).

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

The current configuration is highlighted in Figure 2-2 below. The yellow highlighted section is the pumps themselves that show the 6 (six) condenser pumps that come off each condenser. The green highlighted sections are the upstream piping that is made of 2” vacuum jacketed piping coming from each condenser.

The blue highlighted sections are the downstream piping that is made of 1-1/2” vacuum jacketed piping that is utlized during LAr Purification where the gaseous argon boiloff is being sent back to condenser to be re-liquiefied. The pink highlighted section is the 1” vacuum jacketed manifold that is utlized during the cooldown of the cryostat where the liquid argon has been cooled and cleaned coming out of the condenser. The flow from this system merges with the flow from out of the circulation system common manifold. The combined flow goes to the CUC.

Figure 2-3 is a zoomed in version of the P&ID that better highlights the finer details per condenser pump.

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Figure 2-2: Current Condenser Pump Unit Skid Typical Configuration (To be checked)

Figure 2-3: Typical Pump Current Configuration (Zoomed In) (To be checked)

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3 Condenser Pump Technical Requirements

3.1 Each liquid argon condenser pumps shall be designed for internal vacuum and for a pressure of

10 bar 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 condenser pumps shall each have an adiabatic efficiency higher than 0.5.

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

1. Cryostat Fill

2. Normal Operations

3. Bearing Replacement

4. Maintenance

The current configuration uses 6 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 Cryostat Fill

When the system is clean and cold, the liquid argon is condensed in the Argon Condenser. The clean and cold liquid argon leaving the condenser valve box is sent to the condenser pump and sent to the cryostat for cooldown and fill operations.

4.2 Normal Operations

Liquid argon leaves the condenser from the bottom and into the pump where it circulates liquid argon back to the condenser through the Desuperheater.

4.3 Bearing Replacement

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

4.4 Maintenance

Each pump units shall be capable of a controlled warm-up/cool-down for maintenance without interfering with the pump capacity. 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.

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

Table 5-1: Design Parameters

Equipment

MAWP

psig/ bar Design Temperatures

Minimum/Maximum K (°C) Adiabatic Efficiency

Liquid Argon Condenser Pump Unit

145/10 87K (-186.15°C) / 310K (36.85°C) > 0.5

Table 5-2: Required Flow per Condenser

Supply Scope Max Flow per unit lb/min (g/s) Function

From each Condenser 66 (98) Transfer the LAr during Cryostat fill

Table 5-3: Modes of Operations

Operation Mode Flow lb/min (g/s)

Cryostat Fill Process 396 (2990)

Normal Operations 132 (996)

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Figure 5-4: Flow Diagram for single Condenser and Pump System Typical

Figure 5-5: Flow Diagram for Condensers and Pumps System High Level

5 Appendix A – Design Parameters and Tables