API Spec 6H:1998 pdf download

API Spec 6H:1998 pdf download.Specification on End Closures, Connectors and Swivels.
8.5 OTHER NAMES
Some other commonly used descriptive terms for pipeline closures include but are not limited to:
a. Pipeline hinged closures.
b. Blanking caps.
c. Scraper trap closures.
d. Pig trap closures.
e. B lowdown closures.
8.6 DESIGN
a. Pipeline closures shall be designed in accordance with Section 5 of this specification. The total loading on a closure is limited to the internal pressure, the sealing loads, and the weight of the closure cap. A mechanical device for seal release during opening, and seal compression during closing, shall be supplied with the closure if required by the manufac. turer’s design.
b. For liquid pipelines which must meet the requirements of Title 49 CFR Part 195, the rules of ASME Section VIII. Division I shall be used for new closure design and for design documentation of existing designs that arc based on those rules.
8.7 CLOSURE CONFIGURATIONS
Pipeline closures may be equipped with a hinge or other type handling device. All hinges shall be designed for attachment to the weld huh. The following optional types of hinges are defined:
a. None.
b. Vertical (for attachment to a vertical installation): A lifting device shall be provided to lift and swing the closure cap clear for vertical access into the opened closure. Provisions shall be made to limit the amount of force required to lift the cap.
c. Horizontal; Right Hand (for attachment to a horizontal installation): A handling device shall be provided to support the closure cap in the opened position, and to permit it to be swung and stowed on the right-hand-side (when facing the closure).
d. Horizontal; Left Hand: Same as X.7c except that thc handling device shall be capablc of stowing the cap on the left- hand-side (when facing the closure).
e. Horizontal; hi-directional: Same as g.7c except that the handling device shall be capable of stowing the cap on either side of the closure.
Note: Spccial provisions in the closurc hinge design may be ncccssary to ensure safe operation of an angular closure installation.
8.8 MATERIALS
a. Caps. weld hubs, and support hinges shall be made of materials conforming to one or more of the specifications shown in of Table 4. (‘olumn I.
h. Welding ends shall be made of materials confoming to one or more of the specifications shown in of Table 4, Column 2.
8.9 PRESSURE WARNING DEVICE
All pipeline closures shall be equipped with a pressure warning device which must be opened before the closure can be opened. Closing the pressure warning device shall not be possible until the closure cap is safely engaged. The device shall be constructed and located so that it is accessible for inspection and cannot be readily rendered inoperative. A non- bleed type of pressure warning device is required for toxic or sour service.
8.10 CORROSIVE SERVICE ENViRONMENT
When a corrosive service environment is anticipated the pressure warning device and the hinge mechanism shall be contrusted of corrosion resistant material.