Hydraulics and pneumatics

46 CFR §28.405

Hydraulic equipment. (a) Each hydraulic system must be so designed and installed that proper operation of the system is not affected by back pressure in the system. (b) Piping and piping components must be designed with a burst pressure of not less than four times the system maximum operating pressure. (c) Each hydraulic system must be equipped with at least one pressure relieving device set to relieve at the system's maximum operating pressure. (d) All material in a hydraulic system must be suitable for use with the hydraulic fluid used and must be of such chemical and physical properties as to remain ductile at the lowest operating temperature likely to be encountered by the vessel. (e) Except for hydraulic steering equipment, controls for hydraulic equipment must be located where t…

46 CFR §28.880

Hydraulic equipment. (a) Each hydraulic system must be so designed and installed that proper operation of the system is not affected by back pressure in the system. (b) Piping and piping components must be designed with a burst pressure of not less than four times the system's maximum operating pressure. (c) Each hydraulic system must be equipped with at least one pressure relieving device set to relieve at the system's maximum operating pressure. (d) All material in a hydraulic system must be suitable for use with the hydraulic fluid used and must be of such chemical and physical properties as to remain ductile at the lowest operating temperature likely to be encountered by the vessel. (e) Except for hydraulic steering equipment, controls for operating hydraulic equipment must be loc…

46 CFR §58.30-1

§ 58.30-1 -1 Scope. (a) This subpart contains requirements for fluid power transmission and control systems and appurtenances. Except as otherwise provided for in this section, these requirements are applicable to fluid power and control systems where installed for the following equipment: (1) Steering apparatus, main and auxiliary, including bow thruster systems. (2) Cargo hatch operating systems unless fitted with an alternate mechanical means of operation and approved by the Commandant as hydraulically or pneumatically fail-safe. A system is considered to be fail-safe if a component failure will result in a slow and controlled release of the loading so as not to endanger personnel. (3) Watertight door operating system. (4) Automatic propulsion boiler control systems. (5) Starting …

46 CFR §58.30-20

§ 58.30-20 -20 Fluid power hose and fittings. (a) The requirements of this section are applicable to those hydraulic and pneumatic systems listed in § 58.30-1. (b) Hose and fittings must meet the requirements of subpart 56.60 of this subchapter. (c) Hose assemblies may be installed between two points of relative motion but must not be subjected to torsional deflection (twisting) under any conditions of operation and must be limited, in general, to reasonable lengths required for flexibility. Special consideration may be given to the use of longer lengths of flexible hose where required for proper operation of machinery and components in the hydraulic system. (d) Sharp bends in hoses must be avoided.

46 CFR §58.30-30

§ 58.30-30 -30 Fluid power cylinders. (a) The requirements of this section are applicable to those hydraulic and pneumatic systems listed in § 58.30-1 and to all pneumatic power transmission systems. (b) Fluid power cylinders consisting of a container and a movable piston rod extending through the containment vessel, not storing energy but converting a pressure to work, are not considered to be pressure vessels and need not be constructed under the provisions of part 54 of this subchapter. (c) Cylinders must be designed for a bursting pressure of not less than 4 times the maximum allowable working pressure. Drawings and calculations or a certified burst test report must be submitted to show compliance with this requirement. (d) Piston rods, except steering gear rams, must be either of …

46 CFR §58.30-5

§ 58.30-5 -5 Design requirements. (a) The requirements of part 56 of this subchapter are also applicable to piping and fittings in fluid power and control systems listed in § 58.30-1, except as modified herein. The designer should consider the additional pressure due to hydraulic shock. (b) The system must be so designed that proper functioning of any unit must not be affected by the back pressure in the system. The design must be such that malfunctioning of any unit in the system will not render any other connected or emergency system inoperative because of back pressure. (c) Pneumatic systems with a maximum allowable working pressure in excess of 150 psi must be designed with a surge tank or other acceptable means of pulsation dampening. (d) Each pneumatic system must minimize the en…