API 6D
Pipeline Valves Specification
API 6D is the international specification published by the American Petroleum Institute for pipeline valves used in oil and gas transmission, distribution, and refinery service. The standard covers ball valves, gate valves, plug valves, check valves, and valve testing and certification. API 6D is the foundational valve specification referenced on virtually every EPC pipeline and refinery project worldwide.
Full Definition
API 6D (Specification for Pipeline Valves) is the global standard for pipeline valves used in petroleum, natural gas, and pipeline transmission service. The standard addresses valve design, materials, pressure-temperature ratings, end connections, testing, inspection, and certification for ball valves, gate valves, plug valves, and check valves. API 6D is referenced in Piping Material Specifications (PMS), in MR specifications for valve procurement, and in TBE compliance matrices. See the TBE automation product and the MR package assembly product for the procurement workflow.
Context & Detail
API 6D valve types
API 6D covers ball valves (full bore, reduced bore, trunnion-mounted, floating), gate valves (slab-gate, expanding-gate), plug valves (lubricated, non-lubricated, conical, spherical), and check valves (swing, dual-plate, ball check, piston check). Each valve type has specific design, materials, and testing requirements.
API 6D pressure classes
API 6D pressure classes follow ASME B16.34 standard pressure-temperature ratings: Class 150, 300, 600, 900, 1500, 2500, 4500 (psig at 100°F for carbon steel). Materials per ASME Section II Part A allowable stress tables. Each class drives valve body thickness, bonnet design, and stem sealing.
API 6D testing and certification
API 6D specifies shell hydrostatic test (at 1.5x pressure rating), seat leak test (at 1.1x pressure rating for low pressure, lower at high pressure), and operability test. Type testing covers fire-safe certification per API 607 (for ball valves and plug valves in flammable service) and emission certification per API 622 / 624. Each valve receives a test certificate as part of the supplier package.
EPC Usage
- 01
Pipeline EPC projects (oil and gas transmission, NGL liquids, refined product pipelines) procure API 6D valves at scale: 100-10,000 valves per project depending on pipeline length.
- 02
Refinery EPC projects procure API 6D valves for utility piping, fuel gas systems, hydrogen systems, and chemical injection systems. Indian PSU refineries operate 50,000-500,000 valves per complex with continuous replacement cycles.
- 03
Indian gas pipeline networks (GAIL HVJ pipeline, GAIL DUPL pipeline, IGL CNG distribution, Mahanagar Gas networks) operate API 6D valves at scale across transmission and distribution networks.
- 04
Brownfield revamp projects produce fresh API 6D valve MTO for new piping scope. Existing valves remain in service per original API 6D certification.
- 05
EPC contractors producing valve TBE on API 6D scope use the Compliance Matrix to compare bidders on materials, testing, certification, and delivery against the MR specification.
How Pathnovo Handles It
Pathnovo's piping MTO extraction product extracts API 6D valve quantities from scanned and PDF isometric drawings keyed to the Piping Material Specification. Combined with MR package assembly and TBE automation, Pathnovo closes the engineering-to-procurement loop for API 6D valve procurement.
Frequently Asked Questions
What does API 6D cover?
API 6D (Specification for Pipeline Valves) is the international standard for pipeline valves used in oil and gas transmission, distribution, and refinery service. The standard covers ball valves, gate valves, plug valves, check valves, and valve testing and certification.
What pressure classes does API 6D specify?
API 6D pressure classes follow ASME B16.34: Class 150, 300, 600, 900, 1500, 2500, and 4500 (psig at 100°F for carbon steel). Materials per ASME Section II Part A allowable stress tables. Each class drives valve body thickness, bonnet design, and stem sealing.
What is the difference between API 6D and API 6A?
API 6D covers pipeline valves (ball, gate, plug, check) used in oil and gas transmission and refinery service. API 6A covers wellhead and Christmas tree equipment used in upstream oil and gas production. The two standards serve different parts of the oil and gas value chain.
What testing does API 6D require?
API 6D specifies shell hydrostatic test (1.5x pressure rating), seat leak test (1.1x pressure rating for low pressure), and operability test. Fire-safe certification per API 607 for flammable service and emission certification per API 622 / 624 for fugitive emission control. Each valve receives a test certificate.
Can Pathnovo extract API 6D valve MTO?
Yes. Pathnovo's piping MTO extraction product extracts valve quantities from scanned and PDF isometric drawings keyed to the Piping Material Specification. The product handles API 6D valve types (ball, gate, plug, check) with material grade and pressure class detail.
Related Pages
Piping MTO Software
API 6D valve quantification from isometric drawings.
MR Package Assembly
API 6D valve Material Requisitions for vendor bidding.
TBE Automation
TBE Compliance Matrix for API 6D valve procurement.
ASME B31.3 Standard
Process piping code that frames API 6D valve usage.
Procurement Intelligence Pillar
Full EPC procurement workflow including valve procurement.
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