Non-Conductive Refrigerant Line Break Submittal Checklist

Submittal approval for a non-conductive line break in a SCIF (Sensitive Compartmented Information Facility) or SAPF(Special Access Program Facility) requires a strict, zero-tolerance document review. When evaluating mission-critical HVAC systems within a secure perimeter, a standard commercial MEP submittal package will be immediately rejected by the Certified TEMPEST Technical Authority (CTTA) or the DoD Facility QA/QC team. 

Every metal penetration that crosses an RF, acoustic, or physical TEMPEST enclosure (and HVAC system) is a threat. To meet ICD 705 compliant HVAC requirements, HVAC engineers and contractors must provide factory-engineered assemblies supported by extensive material traceability, certified physical testing, and detailed boundary-integration shop drawings.

Here is the exact submittal review methodology and technical checklist required to pass both local mechanical code inspections and strict CTTA security reviews.

Material Traceability & Mechanical Suitability Requirements

Avoid giving general product cut sheets. For a non-conductive refrigerant line break assembly (and associated components) submittal package, you need to show perfect mechanical fit, compatibility with the refrigerant line system, and full material traceability.

Pressure and Temperature

Check that the assembly is certified for a Design Working Pressure (DWP) higher than the Maximum Operating Pressure (MOP) of the refrigerant (R-410A, R-32, R-454B) under hot, extreme Ambient conditions.

Designed Working Pressure: Minimum 650 psig (4.48 MPa)

Factory Hydrostatic Burst/Proof Test: Minimum 5× safety factor (3,250 psig / 22.4 MPa) with no structural change or seal integrity issue.

Range of Operating Temperatures: 40F to + 250 F (40 C to +121 C).

Material Traceability & Physical Properties

The submittal must include lot-specific mill and resin certificates for all components of the isolation system. Standard NEMA FR4 or G10 glass-epoxy laminates shall meet the requirements of MIL-I-24768/27. G10 and FR4 are NOT interchangeable unless they are identical in structure and thermal performance to satisfy project requirements.

Shop Drawing Protocols & Spatial Geometry

When it comes to BIM coordination and reviewing submissions, one major issue is poor isometric drawings. Shop drawings must show the dielectric-break submission details, clearance drawings, and the arrangement of non-conductive refrigerant-line-break components exactly as they would be in the real world.

Precision of Dimensions Checklist

Verify absolute Dimensional Tolerances: Length, Outer Diameter, Pipe ID, Pipe Wall Thickness.

Isolation Steps: Describe in full detail each of the dielectric isolation steps and each of the components (i.e., non-metal sleeves, isolator gaskets, backing washers, thread isolators).

Insulation Clearance: Drawings should clearly show non-compressive, continuous, elastic pipe insulation over the assembly that maintains insulation clearance and provides adequate access space, without compressing the dielectric gap.

RF Perimeter Coordination Details

Your shop drawings need to clearly show the physical boundary interface. With the design of a secure facility, the HVAC drawing needs to show:

1. The Secure Perimeter Wall, where the Non-Conductive element will be placed, along with the RF-Dielectric Foam Perimeter Sealing.

2. Details for the mechanical termination to the continuous RF Shielding Foil Sheets or Welded Steel Enclosure Sheets.

3. RF Shielding Foam Perimeter Sealing and Insulation Jackets on the unsecured side, and the isolation break details for the structural/seismic pipe hangers.

Understanding the mechanics of electrical discontinuity in SCIF refrigerant piping is critical to preventing accidental grounding loops across structural hangers.

Dual-Review Framework: CTTA vs. Local Mechanical Inspection

A standard UL-tested refrigerant line break can pass a local commercial building inspector's review with flying colors, only to be rejected immediately by the CTTA. 

The two authorities evaluate the submittal through entirely different operational lenses.

The mechanical inspector checks a few important items. First, they need to ensure that the system piping is intact and safe and “leak-tight.” Next, they examine the spans of the pipe supports and analyze which pipes can carry refrigerant, as well as the safety of the fire- and smoke-penetration sleeves. 

CTTA / Security Reviewer looks for a complete electrical disconnect at the penetration. They also look at RF transmission and damping, as well as abiding by ICD 705’s HVAC rules and regulations.

A complete refrigerant line-break submittal must satisfy both distinct verification tracks simultaneously.

Main Reasons for Denying Defense Submittals

Submittals for HVAC components in government facilities are often denied due to careless mistakes that could have been easily avoided. Here are some things to be aware of that may help prevent denials: 

Generic Product References: Submittals are incomplete if they only include a part number, factory acceptance test reports, and certified pressure ratings, or if UL safety certifications are not included.

Attenuation Issues: Failure to provide shielding effectiveness factory test reports or factory reports showing attenuation per NSA 94-106 or IEEE 299 in the range of 10 kHz to 10 GHz is grounds for an incomplete submission.

Missing Hanger Details: If plastic pipe hangers are shown around a break, but there are no details of the adjacent non-conductive pipe hangers, metal-to-metal contact will occur around the break. This negates the purpose of an isolation element.

Lack of Flame/Smoke Certification: If dielectric materials used to construct a component are not compliant with UL 94 V-0 or ASTM E84 regarding smoke/flame performance for a plenum, the component does not qualify for plenum use.

SCIF HVAC Submittal Checklist

Incorporate the following mandatory items into your HVAC submittal checklist before releasing the procurement package to any SCIF HVAC manufacturer or secure HVAC penetration solutions vendor:

Factory Pressure Certification: Documentation of DWP ≥ 650 psig and certified hydrostatic burst test results ≥ 3250 psig

UL Listing & Electrical Safety: Need documentation of classification and listings with electrical isolation, and compliance with UL 94 V-0.

FR4 / G10 Material Test Reports: Mill Certificates with Certification of Mechanical Tests per ASTM D638, D790, D695, D149, D150, D570.

Factory RF Shielding Test Report: An independent lab RF shielding test report of factory shielding that provides a test of attenuation for the specified TEMPEST compliance of the project (NSA 94-106).

Geometry & Assembly Drawings: Provide assembly drawings for the complete assembly of the dielectric sleeve and gaskets. Dimensions shall include alignment and length.

Boundary Penetration Integration Detail: An architectural detail of the break in the non-metallic refrigerant line with the wall assembly and the RF foil wrap perimeter and continuous shielding.

Piping Insulation Clearance Schedule: Uncompressed elastomeric insulation drawings showing required clearances.

Refrigerant & Lubricant Compatibility Matrix: Manufacturer letter verifying the long-term chemical compatibility of refrigerants and POE/PVE oils (A1/A2L).

Submittals should be rejected if they do not include test data or are based on assumptions. A complete and verified set of SCIF construction specifications at the submittal stage should simplify both the field inspection and the implementation of compliant ICD 705 HVAC.