5 Sample point connection flange
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Codes - NOx Technical Code (2008) - Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines - Appendix 8 – Implementation of the direct measurement and monitoring method(Refer to 6.4 of the NOx Technical Code 2008) - 5 Sample point connection flange

5 Sample point connection flange

  5.1 The following is an example of a general purpose sample point connection flange, which shall be sited, as convenient, on the exhaust duct of each engine for which it may be required to demonstrate compliance by means of the direct measurement and monitoring method.

Description Dimension
Outer diameter 160 mm
Inner diameter 35 mm
Flange thickness 9 mm
Bolt circle diameter 1 130 mm
Bolt circle diameter 2 65 mm

Flange slots 		4 holes, each 12 mm diameter, equidistantly placed on each of the above bolt circle diameters. Holes on the two bolt circle diameters to be aligned on same radii. Flange to be slotted, 12 mm wide, between inner and outer bolt circle diameter holes.
Bolts and nuts 4 sets, diameter and length as required.
Flange shall be of steel and be finished with a flat face.

  5.2 The flange shall be fitted to a stub pipe of suitable gauge material aligned with the exhaust duct diameter. The stub pipe shall be no longer than necessary to project beyond the exhaust duct cladding, sufficient to enable access to the far side of the flange. The stub pipe shall be insulated. The stub pipe shall terminate at an accessible position free from nearby obstructions which would interfere with the location or mounting of a sample probe and associated fittings.

  5.3 When not in use, the stub pipe shall be closed with a steel blank flange and a gasket of suitable heat resisting material. The sampling flange, and closing blank flange, when not in use, shall be covered with a readily removable and suitable heat resistant material that protects against accidental contact.

Parent topic: Appendix 8 – Implementation of the direct measurement and monitoring method (Refer to 6.4 of the NOx Technical Code 2008)
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