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General

Legacy ID
16
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Significant Regulatory Guidance
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Pressure Vessels FAQs

What is the difference between a "Rejection Letter" and a "Denial Letter?"How to check the status of your request for an approval within the Pressure Vessel Branch?How to apply for an Approval within the Pressure Vessels Branch?What is the difference between a "Rejection...

Pressure Vessels Policies and Programs

PHMSA respects your right to privacy and will protect it when you visit our website. PHMSA collects no personal information about you when you visit our website unless you specifically and knowingly choose to provide such information to us. If you choose to provide information to us, we use it...

Historical Data - Meetings, Minutes and Listings

All meeting minutes are listed below.

Domestic Independent Inspection Agency (IIA) Minutes - November 16, 2016Domestic IIA Meeting 20152015 IIA Meeting Minutes-Domestic International IIA Meeting 20152015 IIA Meeting Minutes - International​​​​​​​​​​​​​​Independent Inspection Agency (IIA...

M # Symbol

Current M-Number Listing Current M-Number Listing How to Apply for an M#/Symbol

Submit a M # Symbol Approval requests using the PHMSA Portal

Applicants also have the option of submitting request via email to approvals@dot.gov, or mailed to [Department of...

Visual Only Cylinder Requalification

A cylinder passing requalification by the external visual inspection must be marked in accordance with 49 CFR Part 180.213. Not withstanding the requirements in paragraph (b) and (c) of Section 107.805, a person who only performs inspections in accordance with Section 180.209(g) of Title 49 CFR...