VD Roof Decking - Bar grate

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

LBNF/DUNE-US

VD Cryostat Roof Decking – Bar Grate
Procurement Specification
Dated: 09.16.2026

VD Cryostat Roof Decking – Bar Grate Procurement Specification

Version Control & Approval
Table 1 Version History

Revision

Responsible
Person
Justin Freitag

Date

Description of Changes

09.16.2026 Original

Table 2 Approval

Responsible Person
Justin Freitag

Signature

jfreitag

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

Digitally signed by jfreitag
DN: CN=jfreitag
Date: 2026.09.16 12:43:20-05'00'

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VD Cryostat Roof Decking – Bar Grate Procurement Specification

List of Figures

List of Tables

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

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VD Cryostat Roof Decking – Bar Grate Procurement Specification

1 Introduction

Under contract to the U.S. Department of Energy (DOE), the Fermi Forward Discovery Group, LLC (FFDG), is leading the Long-Baseline Neutrino Facility (LBNF) Project to enable a world-class program in neutrino physics. Specifically, the LBNF Project (https://lbnf-dune.fnal.gov) provides the infrastructure for the Deep Underground Neutrino Experiment (DUNE), which will consist of two large liquid argon-based neutrino detectors located nearly a mile underground at the Sanford Underground Research Facility (SURF) in Lead, SD. See Figure 1, LBNF/DUNE-US Schematic
The Far Detector & Cryogenics (FDC) subproject of LBNF/DUNE-US installs the cryostats, detectors, cryogenics and supporting infrastructure at the SURF laboratory.

Figure 1-1 LBNF/DUNE-US Schematic

2 Equipment Description

The roof framing of the cryostat requires access for personnel and equipment, and such an adequate walking surface is required. Bar grating has been selected as the best option for the requirements of the project.

3 Technical Requirements

The vendor shall provide all bar grating and associated clips/hardware that meets the following requirements:

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

VD Cryostat Roof Decking – Bar Grate Procurement Specification

Table 3 Requirements

Requirement

Description

Bearing Bar Height

1-1/2”

Bearing Bar Thickness

3/16”

Nominal unsupported span

48”

Bearing bar span

Bearing bars shall be parallel to span direction

Maximum opening
Dead load [self-weight]

Bearing bars shall have a maximum clear
spacing of 1”

11 PSF

Live load [personnel]