P91
4 in-depth engineering guides on P91 — specification, selection, testing and procurement.
Everything on P91
Vajra's engineering team has published 4 technical guides covering P91 for industrial valve selection, specification, testing and procurement. Browse the full set below.
High-Temperature Valve Selection Guide - Above 300°C to 600°C
Selecting valves above 300°C requires Cr-Mo alloy steel bodies, Stellite trim, graphite packing, and verification against API 941 Nelson curves - this guide explains every decision point.
Valves for Supercritical and Ultra-Supercritical Steam Power Plants
Supercritical and ultra-supercritical steam plants operating at 565–600°C require P91/P92 Cr-Mo-V alloy gate and globe valves with pressure-seal bonnets and Stellite hard-faced trim.
High-Temperature Valve Selection Guide - Above 300°C to 650°C
Carbon steel (WCB) is limited to 425°C. Above this temperature, the correct alloy steel grade selection - WC6, WC9, F22, or P91 - is critical for valve integrity in refinery and power plant service.
Valve Selection for Power Plants: Steam, Feedwater & Turbine Service
Thermal power plants operate at steam temperatures up to 620°C and pressures exceeding 250 bar. Valve failures in steam service are catastrophic - this guide covers IBR compliance, high-temperature alloy steels, steam trap selection, and turbine bypass specifications for coal, gas, and combined-cycle power stations.
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