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— identify possible failure modes and define a realistic range of leak sizes — evaluate possible consequences of cross contamination — describe and evaluate reliability, maintainability and testability of active and passive protection systems (e.g. liquid seals, non return valves, detectors, actuated valves, primary and secondary loops etc.). If the potential consequences of cross contamination are found to be significant or the reliability of protective measures is difficult to maintain or verify, separated systems shall be specified. Guidance note: Investigations following incidents have shown that gas can migrate backwards against the flow of liquids and past check valves. Check valves alone are not normally regarded as reliable devices for prevention of cross contamination where gas is present. ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- 1.2 Prevention of inadvertent operations The machinery and piping systems shall be so arranged that inadvertent operation, caused by human error, cannot lead to the reduced safety of the unit, installation or personnel, or cause environmental damage. This includes the following: 1) Open or closed position of valves shall be easily visible. 2) If a valve's function in the system is not evident, there shall be adequate information on a name plate attached to the valve. 3) All connections to sea shall be marked: SEA DIRECT. 4) The machinery and piping systems shall be arranged to prevent sea water, cargo or ballast from reaching dry spaces of the unit/installation or cargo (oils or chemicals) from being discharged overboard as a consequence of inadvertent operations. 5) Systems and tanks shall be so arranged that leakage or any operation of valves will not directly lead to increased risk of damage to machinery, ship or personnel due to mixing of different fluids. 1.3 Communications 1.3.1 For self-propelled units, at least two independent means shall be provided for communicating orders from the navigating bridge to the position in the machinery space or the control room from which the engines are normally controlled. One of these shall provide visual indication of the orders and responses both in the engine-room and on the navigating bridge. (See MODU Code 7.7) 1.3.2 For self-propelled units, at least one means of communication shall be provided between the control station or bridge and any other control position(s) from which the propulsion machinery may be controlled. (See MODU Code 7.7) 1.4 Engineers' alarm For self-propelled units arrangement shall be provided at the main propulsion control station or at the manoeuvring platform as appropriate for the operation of an engineers' alarm which shall be clearly audible in the engineers' accommodation. (See MODU Code 7.8) 1.5 Fire protection 1.5.1 Facilities for the safe storage and handling of flammable fluids shall be found on board. Offshore standards, DNVGL-OS-D101. Edition January 2018 Marine and machinery systems and equipment Page 16 DNV GL AS Chapter 2 Section 1PDF Image | Marine and machinery systems and equipment 2018
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