---
title: "R-101_converter_incident_note"
doc_type: normalised
tags: [R-101, TAHH-101, FV-101, PSV-101]
summary: "INTERNAL MEMO // HSE // do not distribute"
generated_by: local-fallback
---

# R-101_converter_incident_note

INTERNAL MEMO // HSE // do not distribute
Re: Ammonia Converter R-101 temperature excursion

On 17 June 2022 the number 2 bed of the ammonia converter (tag R-101)
saw a temperature excursion up to about 548 degC following a feed purity
upset. The high-high trip TAHH-101 (set 530 C) acted correctly and cut
feed via FV-101 then depressurised to flare. Catalyst (KM1R) was later
inspected - no permanent damage found.

Design limits reminder: design press 180 barg, design temp 500 C,
3 axial-radial beds. PSV-101 (set 180 barg, 12,400 kg/h to flare) is the
last line of overpressure protection - it must NEVER be gagged or isolated
without a certified spare car-sealed in place first.

Ramp pressure at <= 5 bar/min on startup. Hold bed inlet 380-420 C.
Above 530 C = runaway risk.

Action: added feed-purity interlock. Closed. -- K. Bose, HSE