What is Standard discharge connection as per MARPOL?

To enable pipes of reception facilities to be connected with the ships discharge pipeline for residues from machinery bilges and from sludge tanks both lines shall b e tilted with a standard discharge connection in accordance with the following table:-

Standard dimensions of flanges for discharge connection:-
  • Outside diameter  –  215 mm
  • Inner diameter  –   According to pipe outside diameter.
  • Bolt circle diameter  –  183mm
  • Slots in flange –  6 holes 22 mm in diameter equidistantly placed on a bolt circle of the above diameter, slotted to the flange periphery.
  • The slot with to be 22mm.
  • Flange thickness – 20mm
  • Bolts & nuts quantity & diameter  –  6, each of 20mm diameter and of suitable length.