Continuing from this chapter, we will go in further detail to Scupper & Sanitary pipe.
These from the piping system which discharges scupper or sanitary water directly overboard or into bilge well/tanks.
Weather deck scuppers
Example of deck scupper for ships with square and round gunnels is as shown below :
Scuppers from cargo spaces and other compartments
Steering engine room
Where steering engine room bilges are led to the engine room bilge well, care must be taken as it is necessary to provide automatic closing valves afore the aft end bulkhead of the engine room.
Tween deck cargo spaces
When bilges are led from the ‘tween deck cargo spaces or from cargo holds to the adjacent engine room bilge well or shaft tunnel bilge well, such scupper pipes should be provided with valves or cocks fitted with automatic closing appliances at an accessible
location. Care must be taken in this regard.
In general, bilges in F’cle space are collected into bilge well and discharged using eductor or hand pump. The bilge in chain locker is the same. In small compartment in F’ cle space such as a paint locker, bos’n store bilges are discharged through plugs.
In general, bilges in deck houses are discharged by opening plugs.
Scuppers from living quarters
Inboard end of the discharge pipes The number and type of valves for discharging pipe lines are specified by the International Convention on Load Lines 1966, Annex I Regulation 22 (1), and the same requirements appear in Rule D 13.4.1. The introduction of Regulation 22 (1) is as fol-lows :
* Scupper Inlets and Discharges
* Scupper discharges led through the shell either from spaces on the freeboard deck or from within superstructures and deck houses on the freeboard deck fitted with doors complying with the requirement of Regulation 12 shall be fitted with efficient and accessible means for preventing water from passing inboard.
There are nine ( ①～⑨ ) regulations in Rule Part D Chapter 13.4 corresponding to the above International Convention on Load Lines. These requirements are however a somewhat complex. The general idea is as follows :
(In the following scheme next page, the “Automatic Non-return Valve” (ANRV) is sometimes called the “Storm Valve”.)
Reinforcement of distance pieces
When large distance pieces are provided at the shell plating, brackets connecting the piece and adjacent frames should be fitted.
Surveys and Tests
During construction the following items are to be examined:
Connection of different systems of overboard discharge:
e.g. connection of scupper lines and sanitary lines, connection of scupper lines of weather deck to internal scupper lines etc.
Test method :
① To close all openings including outboard openings,
② To fill with water up to the highest position
Valves and distance pieces fitted to the ship’s side below the load line are to be subjected to a hydro-static test at a pressure of 1.5 times the design pressure or 0.5 M Pa, whichever is the greater.