The
regulations let the manufacturer determine MSD capacity. As
a result, MSD manufacturers have used widely varying per capita
sewage estimates in calculating the capacity of their equipment,
from 35 liters per day to 35 gallons per day. In a proposed
new installation, verify that the unit is large enough, based
on hydraulics and waste load, not numbers of people, to process
the wastewater expected to be generated on board the vessel.
Installing too small an MSD may allow the discharge of partially
treated sewage, which violates the FWPCA.
These calculations shall be used as guidelines, as
33 CFR 159 does not mandate capacities. Each MSD
should be evaluated in terms of the vessel's size, route,
service, and particular circumstances. These capacities consider
only "black-water" toilet drains (on the average,
each person will produce 1.5 liters of waste per day).
APPROXIMATE
FLUSH CAPACITIES FOR VESSEL TOILETS
DRAINING
TO MARINE SANITATION DEVICES
System
Type
|
Liters
per flush |
| Conventional
(Flushometer) |
18.9 |
| Recirculating
|
0.38 |
| Vacuum
|
1.1 |
| Hand
Pump |
1.9 |
| Electric
Pump |
3.8 |
LITERS OF WASTEWATER PER PERSON PER DAY BASED ON PLUMBING
TYPE
| Trip
Length |
User |
Plumbing
System Type |
|
|
Conven. |
Recirc. |
Vacuum |
Hand
Pump |
Electric
|
LONG
(Note 1) |
Crew
|
96.1
|
1.9
|
7.2
|
11.0 |
20.4 |
|
Psgr |
96.1
|
1.9
|
7.2
|
11.0
|
20.4 |
MEDIUM
(Note 2) |
Crew
|
96.1
|
1.9
|
7.2 |
11.0
|
20.4 |
|
Psgr |
31.4 |
0.64 |
7.2 |
3.8 |
6.8 |
SHORT
(Note 3) |
Crew |
48.1
|
0.95
|
3.6
|
7.4
|
10.2 |
| Psgr
|
24.0
|
0.95
|
1.9
|
2.7 |
5.1 |
Note
1: Crew and passengers aboard 24-hour/day.
Note 2: Crew aboard 24-hour/day; 2 groups
of passengers aboard for 4 hours each (2 trips/day), each
passenger using facilities once.
Note 3: All crew aboard 12 hr/day; 6 groups
of passengers aboard for 2 hours (6 trips per day), one fourth
of passengers using facilities once.
(aus
Title 33--Navigation and Navigable Waters
CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
PART 159--MARINE SANITATION DEVICES )
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