API 6D Annex K
API 6D Annex K identifies permissible deviations to specified design and manufacturing requirements allowing for customized valves conforming to this document, when specified by the purchaser at time of order placement.
Annex K
(normative)
Purchaser-specified Customization– Permissible Deviations to Specified Design and Manufacturing Requirements
K.1 General
This annex identifies permissible deviations to specified design and manufacturing requirements allowing for customized valves conforming to this document, when specified by the purchaser at time of order placement.
K.2 Intermediate Pressures and Temperature Ratings
The purchaser shall specify intermediate pressures and temperature rating that do not conform to 4.3.1. The pressure–temperature rating shall be determined by linear interpolation in conformance with ASME B16.34. Valves with ASME flanged ends shall not be designed to an intermediate rating due to the risk of the valve being transferred to a different application, which may use the full flange rating.
When the purchaser specifies an intermediate rated class, the valve shall be marked with the agreed intermediate rated class on the body and nameplate (see Table 11 and Table 13).
Valves with an intermediate pressure-temperature rating shall have a bore size by agreement.
K.3 Non-standard Opening and Reduced-opening Valves
The purchaser shall specify non-standard opening or reduced–opening valves sizes less than NPS 4 (DN 100) or greater than NPS 24 (DN 600), which do not conform to 4.5.1 or 4.5.2.
K.4 Design Codes
The purchaser shall specify when a specific design codes or standards at their option to be used.
K.5 Non-standard Face-to face and End-to-end Dimensions
The purchaser shall specify, in conformance with 5.2.2, face-to-face and end-to-end dimensions that are not shown or do not conform to 5.2.1.
K.6 End Connectors
The purchaser shall specify end connectors that do not conform to 5.2.3.1.1.
The purchaser shall specify weld-end connectors that do not conform to 5.2.3.2.
The purchase shall specify any other weld connector that does not conform to 5.2.3
EXAMPLE Clamp, compact flange, hub, swivel, special weld-ends, etc.
K.7 Other Drain Connectors
The purchaser shall specify other sizes or types of drain connectors, such as welded, seal welded or flanged in accordance with 5.6.1.
K.8 Lifting
The purchaser shall specify any design, manufacturing and/or certification requirements for lifting points that do not conform to 5.9.
The purchaser shall specify when lifting points on the valve are not required per 5.9
K.9 Design Validation
The purchaser shall specify when design validation as specified in 5.10.3 shall conform to Annex F.
K.10 Material Specification
The purchaser shall specify the use of other pressure containing and pressure controlling materials that do not conform to manufacturer’s written material specification per 6.1.
K.11 Chemical Composition
The purchaser shall specify the chemical composition of pressure containing and pressure controlling materials that do not conform to 6.3.
K.12 Weld Repair of Forgings and Plate Material
The purchaser shall specify when weld repair of forgings and plates is acceptable to correct material defects, in conformance with 7.11.3.
K.13 Other Bolting— Hardness Testing
The purchaser shall specify the acceptable hardness limits for pressure boundary bolting that do not conform to 8.1.
K.14 Alternative Seat Test
The purchaser shall specify performing a high-pressure gas seat test conforming to I.7.3 as an alternative to the hydrostatic seat test of 10.4
