Valves for Oil & Gas Pipelines

API 6D (Pipeline and Piping Valves) specifies gate, plug, ball, and check valves for pipeline service. The standard covers design, materials, dimensions, testing, and documentation. All isolation valves on a pipeline must be API 6D certified; this is a contractual requirement in ONGC, GAIL, and most oil company pipeline standards.

A fire-safe valve maintains seat sealing integrity and stem packing containment in the event of an external fire (tested per API 607 / API 6FA). This prevents a valve leak from feeding a hydrocarbon fire. Fire-safe design is mandatory for all valves handling flammable hydrocarbons under Indian OISD standards and most international oil company specifications.

NACE MR0175 (now ISO 15156) specifies material requirements for equipment used in H₂S-containing (sour) oil and gas environments to prevent sulphide stress cracking (SSC) and hydrogen-induced cracking (HIC). Valves in sour service must use hardness-controlled, NACE-compliant materials for all pressure-containing components. Failure to specify NACE materials in sour service can lead to catastrophic cracking failures.

A DBB valve provides two independent seating surfaces and a bleed/vent between them, allowing both upstream and downstream pressure to be blocked simultaneously while venting the cavity between the seats — confirming positive isolation. DBB valves are used on metering skids, sampling connections, chemical injection points, and maintenance isolation where 'double isolation and bleed' is required by OSHA PSM and equivalent safety standards.

Yes. Vajra Industrial Solutions arranges third-party inspection (TPI) by EIL (Engineers India Limited), Lloyd's Register, Bureau Veritas, SGS, or the client's nominated inspector for all ONGC, GAIL, IOCL, and major pipeline projects. We are familiar with EIL vendor approval procedures and supply valves with full documentation packs meeting OGSP / CPCL / project-specific VDS requirements.