General
- Tag, line number, P&ID, service description
- Quantity and revision
- Applicable project specifications
Design / process data
- Fluid, phase, normal and design P/T
- Flow (normal / max), allowable ΔP
- Fluid service category (B31.3) and corrosion allowance
Construction
- Type, size, end-to-end (B16.10), end connection / facing (B16.5)
- Body, bonnet, trim, seat, stem material
- Pressure class (B16.34), bore (full / reduced)
- Fire-safe (API 607 / 6FA), fugitive emission class (ISO 15848-1)
Testing & marking
- Shell / seat test per API 598 or API 6D
- Seat leakage class (FCI 70-2)
- NACE MR0175 / ISO 15156 if sour
- Marking per MSS SP-25
Actuator (if applicable)
- Type (pneumatic / electric / hydraulic), action, fail position
- Supply pressure, stroking time
- Accessories: positioner, limit switches, solenoid, handwheel
Use of this content
This page is a decision-support and training reference. It is not a substitute for the governing code, the project specification, or the judgement of a responsible engineer. Always validate against the current edition of the applicable standard before use on live engineering work.