ASME/BPVC - 2390-5
2390-5 Composite Reinforced Pressure Vessels Section VIII, Division 3 SUPP 6
|Publication Date:||1 July 2007|
SCOPE AND BASES OF THE CODE CASE
General Construction Description. This construction method uses a laminate of continuous unidirectional filaments of a specified glass fiber with a specified resin that is circumferentially wound in a systematic manner under controlled tension over a cylindrical metallic layer and cured in place. Openings are not permitted in the laminate. Metallic ends and nozzles that meet the requirements of this Division complete the construction. See Figs. 1 through 3.
Construction Rules. Each CRPV shall comply with all existing rules of this Division unless otherwise stated as additional requirements and exemptions in this Case.
Metallic Layer. The outside diameter of the metallic layer in the reinforced area shall not exceed 60 in. (1.52 m). The thickness of the metallic layer shall not be less than 0.25 in. (6 mm).
Weld Thickness. The thickness of the welds in the metallic layer of the reinforced area shall not exceed 1.25 in. (32 mm).
Service Life. Service life for CRPV constructed under the rules of this Case shall be limited to 20 years from the date of manufacture as noted on Form CRPV-1.
Maximum Design Pressure. The internal design pressure for CRPV shall not be greater than 3,625 psi (25 MPa).
Service Pressure and Working Pressure. In some standards and regulations used in ambient temperature compressed gas transport service, the term "service pressure" is used to indicate the pressure in the vessel at a temperature of 70°F (20°C). In other standards and regulations, the term "working pressure" is used with the same definition. In these standards and regulations it is generally allowable for the service or working pressure to be exceeded as the gas is heated beyond 70°F (20°C) during filling or due to atmospheric heating. For pressure vessels to be used in ambient temperature transport service constructed to this Case, the service pressure and the working pressure shall be the maximum expected pressure at a temperature of 70°F (20°C). The service pressure or the working pressure or both shall be defined in the User's Design Specification. The expected pressure due to heating during filling or atmospheric heating shall not exceed the design pressure of the vessel.
Requirements for Cyclic Pressure Qualification Test. In addition to the total number of operating cycles during the life of the CRPV, the User's Design Specification shall state the number of operating pressure cycles that will occur at a metal or composite temperature colder than 30°F (0°C) and the number of operating pressure cycles that will occur at a metal or composite temperature warmer than 110°F (45°C).
Laminate Tensile Strength and Elastic Modulus. The User's Design Specification shall state the required minimum tensile strength and the nominal elastic modulus for the laminate in the maximum property direction (parallel to the fiber direction).