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MEO Class II: MEKG MEKM MEP MET SC&S SSEP 📊 Trends
Q3 (20 Marks) International Conventions
SSEP • Written Exam

Explain the following with reference to MARPOL Annex-VI

(a) Ozone depleting substances and its emissions control. (5)

(b) Volatile Organic and its emissions control. (5)

(c) NOx emissions and its control from ships. (5)

(d) NOx technical file. (5)

Appeared In: Jun 2024

✓ Verified Model Answer (Text Solution)

Structured for DG Shipping MEO Class II examination scoring criteria.

Exam Ready

Explain the following with reference to MARPOL Annex VI:

Part (a)

Ozone depleting substances and its emissions control.

Part (b)

Volatile Organic Compounds and its emissions control.

Part (c)

NOx emissions and its control from ships.

Part (d)

NOx technical file.

(Refer to the detailed answers for 697b10a0106472e33d9754ce and 694a8e750457bfed0da63f81.)

Part (a)

ODS and emission control (Reg 12): Deliberate releases of ozone-depleting substances (CFCs, HCFCs, Halon) emitted during maintenance, servicing, repair or disposal are prohibited; new installations must not contain ODS (or the use of ODS is phased out by date); ships may not receive virgin ODS; discharges are recorded in the ODS/log. ODS damage the stratospheric ozone layer; control reduces their release.

Part (b)

VOC and emission control (Reg 15): tankers (crude oil and product) carrying VOC-emitting cargoes must have vapour emission (vapour recovery/collection) control and be provided with vapour-return connections; loading terminals recover vapours; VOC emissions limited by using vapour return lines, keeping tank pressures, and recovery; the aim is to reduce VOC (which contribute to smog and are lost product) to atmosphere.

Part (c)

NOx and control (Reg 13/Tiers): NOx emission limits (Tier I/II/III) set by engine speed; engines above 130 kW certified under the NOx Technical Code (EIAPP), and Tier III applies within NOx Emission Control Areas; controls by engine design/SCR/EGR/water injection; compliance verified by the NOx Technical File and survey.

Part (d)

NOx Technical File: the document recording the engine's certified parameters/settings by which NOx compliance is achieved, proving compliance (refer to the detailed answer).

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