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C: Electrical and Electronic Equipment [Table of Contents] Sec.5: User Interface

DNV-OS-D202 Automation, Safety, and Telecommunication Systems

[-] Ch.2: Technical Provisions
[-] Sec.4: Component Design and Installation
[-] D: Pneumatic and Hydraulic Equipment

Ch.2 Sec.4
D. Pneumatic and Hydraulic Equipment

Ch.2 Sec.4
D 100   Pneumatic equipment

Ch.2 Sec.4 D
101   Components requiring extremely clean air shall not be used. Extremely small openings in air passages shall be avoided.

Ch.2 Sec.4 D
102   Main pipes shall be inclined relative to the horizontal and drainage shall be arranged.

Ch.2 Sec.4 D
103   Pipes and other equipment made of plastic materials may be used if they have satisfactory mechanical strength, low thermoplasticity, high oil resistance, and flame retardation. See DNV-OS-D101.

Ch.2 Sec.4 D
104   For air supply, the redundancy requirement of DNV-OS-D101 applies for compressors, pressure reduction units, filters and air treatment units (lubricator or oil mist injector and dehumidifier).

Ch.2 Sec.4 D
105   Air to instrumentation equipment shall be free from oil, moisture and other contaminations. Condensation shall not occur at relevant pressures and temperatures. For air flowing in pipes which are located entirely inside the machinery space and accommodation, the dew point shall be more than 10°C below ambient temperature, but need normally not be lower than 5°C. The dew point of air flowing in pipes on open deck shall be below -25°C.

Ch.2 Sec.4 D
106   Reduction valves and filters shall be duplicated when serving more than one function (e.g. more than one control loop).

Ch.2 Sec.4 D
107   Piping and tubing to actuators and between actuators and local accumulators should be hydrostatically tested to 1.5 times the system design pressure for minimum 15 minutes.

Ch.2 Sec.4 D
108   Local accumulators used as back up air supply for essential systems shall be designed and located or protected to minimise the possibility of inadvertent isolation or mechanical damage which could prevent correct operation on demand.

Ch.2 Sec.4 D
109   Piping and tubing shall be cleaned and dried before connected to control systems.

Ch.2 Sec.4 D
110   Piping, tubing and components in systems required to operate in a fire scenario shall have adequate fire resistance properties to ensure correct system operation. This is particularly important for systems where pneumatic energy is required to operate or maintain control over the system.

Ch.2 Sec.4
D 200   Hydraulic equipment

Ch.2 Sec.4 D
201   System components and arrangement shall satisfy the requirements in DNV-OS-D101.

Ch.2 Sec.4 D
202   Piping and tubing to actuators and between actuators and local accumulators should be hydrostatically tested to 1.5 times the system design pressure for 15 minutes.

Ch.2 Sec.4 D
203   Local accumulators used as back up power supply for essential systems shall be designed and located or protected to minimise the possibility of inadvertent isolation or mechanical damage which could prevent correct operation on demand.

Ch.2 Sec.4 D
204   Piping, tubing and components in systems required to operate in a fire scenario shall have adequate fire resistance properties to ensure correct system operation. This is particularly important for systems where hydraulic energy is required to operate or maintain control over the system.

Ch.2 Sec.4 D
205   Piping and tubing shall be flushed and cleaned before being connected to control systems.

Ch.2 Sec.4 D
206   Hydraulic oil return lines shall be designed with capacity to allow the maximum return flow during extreme conditions without reducing overall system performance. Care shall be taken to avoid the possibility of blockages at filters, vents or by mechanical damage or inadvertent operation of valves.
C: Electrical and Electronic Equipment [Table of Contents] Sec.5: User Interface