2.2 Component requirements

  2.2.2.1 Extraction pumps should have sufficient power and be of adequate capacity to operate with the normal conditions of ventilation in the protected spaces with the connected sampling pipe sizes to ensure a response time in accordance with paragraph 2.1.2 for all sampling points.

  2.2.2.2 Main and back-up extraction pumps of equal power and capacity should be provided and arranged to automatically switch over to the back-up pump in case of failure of the main pump. Alternatively, any failure of the main extraction pump should be automatically indicated and at least one spare extraction pump or equivalent parts should be provided on board.

  2.2.3.1 Sampling pipes should be constructed of stainless steel, or other corrosion resistant materials acceptable to the Administration, and should be a minimum of 6 mm in inner diameter.

  2.2.3.2 The location, number and arrangement of sampling points within a space should be determined in consideration of design parameters including the configuration of the space, internal obstructions, the length and internal diameter of sampling pipes, the extraction pump capacity, and the density of the vapours of the oil products intended to be carried.

  2.2.3.3 Sampling pipes located within ballast tanks should be of sufficient strength to withstand hydrostatic pressure when in the most severe ballast condition.

  2.2.3.4 Sampling pipes should be arranged to prevent progressive flooding upon failure.

  2.2.3.5 Sampling pipes should be provided with a suitable connection for the fitting of portable detection equipment.

  2.2.3.6 Sampling pipes should include a means to prevent blockage from debris accumulation.

  2.2.3.7 Sampling pipes should be self-draining.