MARINE SAFETY CENTER
Marine Safety Center Tank Vessel/Offshore Division
Vessel and Cargo Branch (C1):
The Marine Safety Center's Vessel and Cargo Branch conducts plan review for certain vessels certificated under 46 CFR Subchapters D, I, L, and O. The table below provides additional guidance on the Vessel and Cargo Branch responsibilities.
If you have any questions, please contact the Vessel and Cargo Branch Chief at (202) 795-6776.
Type of Reviews Conducted
Tankships & Tank Barges (Sub-D &/or O)
Offshore Supply Vessels (Sub-L)
Industrial Vessels (Sub-I)
Structural Fire Protection
Vapor Control Systems
Procedures & Arrangements Manual
Volatile Organic Compound Manual
Cargo Authority Attachment
Oil Spill Response Vessels (Sub-D)
Oil Field Waste Barges (Sub-D)
Vapor Control Systems
Foreign Gas Carriers (IGC Code)
Subchapter O Endorsement
Foreign Tank Vessels
Double Block & Bleed for Non-Nitrogen Inert Gas Systems
If a topic is not listed in the table above, then the issue is typically handled by another Branch at the MSC, or by Coast Guard Headquarters.
The following requests should be submitted to the Office of Design and Engineering Standards, Hazardous Materials Division (CG-ENG-5):
Facility Vapor Control System Approvals
Requests for cargo carriage requirement determinations for cargoes not specifically listed in 46 CFR 30.25-1, Table 151.05, 153 Table 1, 153 Table 2, 154 Table 4, 33 CFR 151.47 or 33 CFR 151.49
Request for the carriage of packaged hazardous, flammable or combustible liquids
Outer Continental Shelf (OCS) Branch (C2):
The Marine Safety Center's Outer Continental Shelf (OCS) Branch conducts plan review for OCS facilities, lifeboats, and portable accommodation modules. Responsibilities include:
In-Service Inspection Plans (ISIP)*
Marine Operations Manuals (MOM)*
Life Extension requests*
* Reviewed jointly with the Coast Guard Eighth District Outer Continental Shelf Officer in Charge, Marine Inspections (OCS OCMI)
If a topic is not listed in the table above, then the issue is typically handled by another Branch at the MSC, or by Coast Guard Headquarters. Fire Control Plans should be submitted directly to the OCS OCMI.
If you have any questions please contact the OCS Branch chief at 202-795-6773.
Subchapter O Endorsements:
*Foreign flagged chemical carriers do not require a Subchapter O Endorsement from MSC. The requirements for foreign flagged chemical carriers operating in U.S. waters are detailed in the Chemical Tank Vessel Information Sheet (CTVIS).
Cargo Authority Tank Group Characteristics Forms (TGCLF):
46 CFR 151 TGCLF
46 CFR 153 TGCLF
MARPOL Annex II (IBC Code) TGCLF
Cargo Authority Attachment Flow Chart
Vessel Cargo Authority Help Tool
Vapor Control Systems (VCS):
Office of Design & Engineering Standards (CG-ENG)
Hazardous Materials Division (CG-ENG-5)
Office of Commercial Vessel Compliance (CG-CVC)
Liquefied Gas Carrier National Center of Expertise (LGC NCOE)
Outer Continental Shelf National Center of Expertise (OCS NCOE)
Last Modified: 10/26/2017