[Code of Federal Regulations]
[Title 46, Volume 1]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR39.40-3]

[Page 516]
 
                           TITLE 46--SHIPPING
 
         CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
 
PART 39_VAPOR CONTROL SYSTEMS--Table of Contents
 
Subpart 39.40_Lightering and Topping-Off Operations with Vapor Balancing
 
Sec. 39.40-3  Design and equipment for vapor balancing--TB/ALL.

    (a) If the cargo tanks on a vessel discharging cargo and a vessel 
receiving cargo are inerted, the service vessel must:
    (1) Have a means to inert the vapor transfer hose prior to 
transferring cargo vapor; and
    (2) Have an oxygen analyzer with a sensor or sampling connection 
fitted within 3 meters (9.74 ft.) of the vessel vapor connection which:
    (i) Activates an audible and visible alarm at a location on the 
service vessel where cargo transfer is controlled when the oxygen 
content in the vapor collection system exceeds 8 percent by volume;
    (ii) Has an oxygen concentration indicator located on the service 
vessel where the cargo transfer is controlled; and
    (iii) Has a connection for injecting a span gas of known 
concentration for calibration and testing of the oxygen analyzer.
    (b) If the cargo tanks on a vessel discharging cargo are not 
inerted, the vapor collection line on the service vessel must be fitted 
with a detonation arrester that meets the requirements of 33 CFR 
154.822(a) located within 3 meters (9.74 ft.) of the vessel vapor 
connection.
    (c) An electrical insulating flange or one length of non-conductive 
hose must be provided between the vessel vapor connection on the service 
vessel and the vapor connection on the vessel being lightered or topped-
off.