Subject: Cryogenic Fluids  

Revised: April 2025 

Purpose: An operational permit is required to produce, store, transport on site, use, handle or dispense cryogenic fluids in excess of the amounts listed in Table 105.6.10 of this code. Exception: Permits are not required for vehicles equipped for and using cryogenic fluids as a fuel for propelling the vehicle or for refrigerating the lading. Cryogenic fluid is defined by the approved code as, a fluid having a boiling point lower than -130°F (-89.9°C) at 14.7 pounds per square inch atmosphere (psia) (an absolute pressure of 101.3 kPa). 

TABLE 105.6.10 

PERMIT AMOUNTS FOR CRYOGENIC FLUIDS 

TYPE OF CRYOGENIC FLUID  | INSIDE BUILDING (Gallons)  | OUTSIDE BUILDING (Gallons) 

Flammable | More than 1 | 60 

Inert | 60  | 500 

Oxidizing (includes oxygen)  | 10  | 50 

Physical or health hazard not indicated above  | Any Amount  | Any Amount 

Fees: $300.00 Annually 

Requirements: A Cryogenic Fluids permit will be issued once an application has been completed appropriately, all applicable documents have been uploaded, and a hazardous materials permit has been applied for in conjunction with the Cryogenic Fluids permit.  

Applications will be completed electronically, and all required documentation shall be uploaded electronically. There shall be no paper submissions. Permit application shall be completed and submitted through the approved Harris County software program. Once the application is received along with all required documentation, the Fire Code Official will conduct a review. When the permit process is complete, and authorization is given, the applicant will be notified that the permit is issued, and the duration of the permit will be indicated.  

All Cryogenic Fluids permit applications will begin with generalized information requirements. This information will pertain to the property information/property owner’s information/application information/project name.  

When applying for a Cryogenic Fluids operational permit the applicant shall provide the following information: 

• Site map identifying where Cryogenic Fluids being stored, including maximum quantity and storage configuration. Also identify hazardous monitoring locations, location of all on-site fire suppression to include fire pumps, ponds, water supplies, layout of fire lanes, gas meter, and Knox Box if installed. If renewing a Cryogenic Fluids operational permit and no changes have been made to your facility from previous permit cycle, a written statement claiming no changes have been made can be submitted in lieu of plans; 

• A drawing/ floor plan of building including all entrance and exits, location of primary and secondary exit routes, locations of fire extinguishers, fire protection system panels, risers, and/or other fire protection control systems and/or panels, etc. If renewing a Cryogenic Fluids operational permit and no changes have been made to your facility from previous permit cycle, a written statement claiming no changes have been made can be submitted in lieu of plans; 

• Copy of the emergency plan, compliant with Chapter 4 of the International Fire Code, current adopted edition; 

• Information on types of fire alarm systems installed and last inspection date (provide last inspection report or photo of current inspection tag(s). This shall include all fire alarm systems or other gas detection systems at the facility; 

• Information on installed sprinkler systems and last inspection date (provide last inspection report or photo of current inspection tag(s). This shall include all fire sprinkler systems at the facility; 

• Information on fire extinguishers or any type of alternate (including but not limited to automatic hood suppression, paint booth systems, clean agent) fire protection system installed and last inspection date (provide last inspection report or photo of current inspection tag(s)); 

• Detailed written description of the on-site operation (retail, manufacturing, storage, use, etc.); 

• Copy of the approved/up-to-date Hazardous Materials Inventory Statement; 

• A written statement certifying storage and use of hazardous materials is in compliance with International Fire Code (IFC) Chapters 50-67, current adopted edition. 

If one or more of the requested documents does not apply to your location, please submit in writing a reason for not submitting.  

Denial: If it is determined that an application fails to meet the requirements as set forth in this standard or the applicant refuses to provide all required documentation, the fire code official shall not issue a permit, but shall return the application to the applicant with explanation for refusal.  

Revocation: The fire code official is authorized to revoke a permit where it is found that there has been false statements or misrepresentation as to the material facts in the application or supporting documentation on which the approval and issuance was based, the permit was issued to a different person or firm than named on the permit, the permittee failed, refused or neglected to comply with orders or notices duly served in accordance with the provisions of this code within the time provided therein, or the permit was issued in error or in violation of an ordinance, regulation or this code.