[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR174.330]

[Page 181]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 174--SPECIAL RULES PERTAINING TO SPECIFIC VESSEL TYPES--Table of Contents
 
      Subpart I--Hopper Dredges With Working Freeboard Assignments
 
Sec. 174.330  Jettisoning of spoil.

    (a) When doing the calculations required by Sec. 174.310 for a 
hopper dredge with bottom doors, it may be assumed that the spoil is 
jettisoned immediately after damage and that the bottom doors remain 
open if:
    (1) The bottom doors are designed so that they may be fully opened 
from:
    (i) The closed position within two minutes even if the main power 
source is lost or the bottom door actuating mechanism is damaged; and
    (ii) The navigating bridge;
    (2) The discharge area through the bottom doors is equal to or 
greater than 30 percent of the maximum cross sectional area of the 
hopper measured in a plane parallel to the waterline; and
    (3) Asymmetrical jettisoning of the spoil is impossible.
    (b) When doing the calculations required by Sec. 174.310 for a 
hopper dredge with a split hull, it may be assumed that the spoil is 
jettisoned immediately after damage if--
    (1) The hull is designed so that--
    (i) The complete separation is effected within two minutes even if 
the main power source is lost or the actuating means is damaged; and
    (ii) The actuating means can be operated from the navigating bridge;
    (2) It is shown to the Commanding Officer, Marine Safety Center, 
either by calculations or by operational tests, that the hulls can 
separate sufficiently to allow the dredged material to dump without 
bridging; and
    (3) Asymmetrical jettisoning of the spoil is impossible.

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