Hastelloy
7 in-depth engineering guides on Hastelloy — specification, selection, testing and procurement.
Everything on Hastelloy
Vajra's engineering team has published 7 technical guides covering Hastelloy for industrial valve selection, specification, testing and procurement. Browse the full set below.
Valve Selection for Sulphuric Acid Service: Materials, Lining and Design Guide
Sulphuric acid is one of the most deceptive fluids to specify valves for - its corrosivity flips dramatically with concentration, temperature, and velocity. This guide maps concentration-temperature zones to the right alloy or lining and the correct valve design.
Valve Material Compatibility Guide - Chemical vs Material Selection
Selecting the wrong valve material for a chemical service leads to corrosion, leakage, and catastrophic failure - this guide maps key chemicals to compatible valve body and seat materials.
Valve Selection for Acid Service - H₂SO₄, HCl, HNO₃ and Phosphoric Acid
Acid service valves require precise material matching to acid type, concentration, and temperature. A material that works in dilute H₂SO₄ may fail instantly in concentrated HCl. This guide maps the right alloy to each acid.
Valve Selection for Chlorine (Cl₂) Service - Materials, Safety & Standards
Chlorine is one of the most hazardous industrial chemicals. Valve material selection is counterintuitive - dry Cl₂ is less corrosive than wet Cl₂, and water is the most dangerous contaminant.
High Alloy Valves: Hastelloy C-276, Inconel 625, Monel 400 - When and Why
Hastelloy C-276, Inconel 625, and Monel 400 valves are specified when carbon steel and stainless steel 316L cannot provide adequate corrosion resistance - here's exactly when each alloy is the right choice.
Valve Body Material Selection Guide: WCB, CF8M, SS 316L, Duplex, Hastelloy - When to Use Each
Choosing the wrong valve body material is the most expensive procurement mistake in process plant design. This guide walks through the five main categories: carbon steel, stainless steel, duplex, nickel alloy, and lined - and when each is the right choice.
Valve Selection for Chemical Plants: Materials, Standards & Fugitive Emissions
Chemical plants handle acids, alkalis, solvents, and highly toxic fluids - valve material failures cause catastrophic releases. This guide covers the material selection matrix for corrosive chemical service, NACE MR0103 requirements for refinery service, fugitive emissions ISO 15848 compliance, and the role of polymer-lined valves.
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