Section 7 Pumping and piping
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 5 Main and Auxiliary Machinery - Chapter 24 Emissions Abatement Plant for Combustion Machinery - Section 7 Pumping and piping

Section 7 Pumping and piping

Parent topic: Chapter 24 Emissions Abatement Plant for Combustion Machinery

7.1 General

7.1.1 Pipe work and transfer systems which may carry chemical substances are to meet the requirements of Pt 5, Ch 12 Piping Design Requirements, Pt 5, Ch 13 Ship Piping Systems and Pt 5, Ch 14 Machinery Piping Systems, as applicable. Where it is proposed to apply corrosion resistant lining to steel pipe systems then such lining is to be confirmed as being suitable for the application, in accordance with Pt 5, Ch 24, 4.1 General 4.1.2. The elasticity of the lining is not to be less than that of the supporting boundary material.

7.1.2 Pipe systems carrying sea-water or fresh water are to meet the requirements of Pt 5, Ch 12 Piping Design Requirements, Pt 5, Ch 13 Ship Piping Systems and Pt 5, Ch 14 Machinery Piping Systems. Where there is a risk of fresh water or sea-water systems becoming contaminated with process chemicals, substances or effluent, pipe systems are to comply with Pt 5, Ch 24, 7.1 General 7.1.1.

7.1.3 Chemical transfer and control arrangements are to be provided with a stop-valve, capable of being manually operated on each tank filling and discharge line, which as practicable is to be attached directly to the tank plating. Additionally, a stop valve is to be provided at each chemical-hose loading connection.

7.1.4 Bilge and effluent pumping and piping systems in the emissions abatement plant spaces are to be constructed of material suitable for any chemicals or substances used by the emissions abatement plant, effluent that is produced or any combination of substances on board which might result from accidental admixture.

7.1.5 Arrangements are to be provided for the control of the bilge and effluent pumping and piping system. They are to be installed in the emissions abatement plant spaces from within these spaces and also from a position outside the spaces.

7.1.6 Bilge and effluent pumping and piping systems for hazardous materials should, wherever possible, be installed in the space associated with the particular hazard. Alternative arrangements will be subject to special consideration.

7.1.7 Where chemicals or wash water are injected into exhaust piping, or where wash water may drain into exhaust piping, the exhaust piping is to be constructed of materials suitable for such chemicals and wash water, see Pt 5, Ch 24, 3.3 Chemical substances 3.3.1. and Pt 5, Ch 24, 4.1 General 4.1.2.

7.1.8 Where filters are used, they are to be capable of being safely cleaned and maintained without impacting essential services.

7.1.9 Where applicable, tanks are to be maintained within the temperature limits of the chemicals and substances they contain so as to avoid risks of boiling, stress corrosion, freezing and other temperature-sensitive processes.

7.1.10 The loading or discharge connections associated with chemical substances are to be located on the open deck away from sources of ignition and arranged such that a spill or any leakage at loading or discharge connections would not result in chemical substances contacting or mixing with other incompatible materials; alternative arrangements will be subject to special consideration. Drip trays having means of drainage to the dedicated residue or overflow tank are to be provided.

7.1.11 The overboard discharge is to be independent of other systems and arranged in such a way as to prevent the discharge water from being drawn into sea suctions for other pipe systems.

7.1.12 Where the emissions abatement plant is fed from multiple exhaust streams, gas inlet piping is to have separate inlets unless arranged with suitable by-pass arrangements to prevent any impact on essential services in the event of failure. The inlets are also to have suitable arrangements to prevent exhaust backflow down any of the exhaust gas inlets.

7.2 Ammonia solution piping

7.2.1 Pipes/piping systems containing ammonia solution (see Pt 5, Ch 24, 10.3 Ammonia solution) are to be of steel or other equivalent material with a melting point above 925°C, except downstream of a tank valve, provided that this valve is metal seated and, in the event of fire, is arranged either as fail-to-closed or equipped with quick closing facilities operable from a safe position outside the space. In such cases, Type Approved plastic piping is acceptable without the need for fire endurance testing.

7.3 Sodium hydroxide solution (NaOH) or calcium hydroxide solution (Ca(OH)2) piping

7.3.1 All pipes or other tank penetrations are to be provided with manual closing valves attached to the tank. In cases where such valves are provided below top of tank, they are to be arranged with quick acting shutoff valves, which are to be capable of being remotely operated from a position safely accessible in the event of chemical treatment fluid leakage.

7.3.2 Pipe joints for sodium hydroxide (NaOH) or calcium hydroxide (Ca(OH)2) solutions (see Pt 5, Ch 24, 10.4 Sodium hydroxide solution (NaOH) or calcium hydroxide solution (Ca(OH)2)) are to be fully welded, except in way of valves or equipment, and are to be considered Class I piping systems regardless of design pressure in storage, handling and supply systems.

7.3.3 The following connections containing sodium hydroxide (NaOH) or calcium hydroxide (Ca(OH)2) solutions (see Pt 5, Ch 24, 10.4 Sodium hydroxide solution (NaOH) or calcium hydroxide solution (Ca(OH)2)) are to be screened and fitted with drip trays to prevent the spread of any spillage where they are installed:
  1. detachable connections between pipes (flanged connections and mechanical joints, etc.);
  2. detachable connections between pipes and equipment such as pumps, strainers, heaters, valves; and
  3. detachable connections between equipment mentioned in Pt 5, Ch 24, 7.3 Sodium hydroxide solution (NaOH) or calcium hydroxide solution (Ca(OH)2) piping 7.3.3.
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