HAZARDS AND OPERABILITY STUDIES (HAZOP)

Project Name: Production of MethanolDate: 28TH MAY 2014Page of

Process: Flash Drum

SectionReference drawing:

ItemStudy NodeProcess ParameterDeviations

(Guide words)Possible causesPossible ConsequencesAction required

FLASH DRUMPressureLow1. Lower feed drum temperature.

1. Higher liquid level1. Install pressure and temperature controller for the drum.

2. Leakage in the flash drum2. Lower CO2 vapor recovered at the top of flash drum.2. Install pressure indicator in the flash drum.

FLASH DRUMPressureHigh1. Higher feed temperature.

1. Lower liquid level.1. Install pressure and temperature controller for the drum.

2. Blockage in vapor stream.2. Risk of drum explosion.2. Install pressure alarm.

ItemStudy NodeProcess ParameterDeviations

(Guide words)Possible causesPossible ConsequencesAction required

FLASH DRUMLevelLow1. Blockage in inlet stream.

1. No separation occurs1. Low level alarm

2. The inlet stream too hot.2. No separation occurs. The pump might damage.2. Install temperature controller at the feed stream

FLASH DRUMLevelHigh1. Inlet stream too cold.

1. No separation occurs.1. Install temperature controller at the feed.

3. Blockage in vapor stream.2. Risk of drum explosion.3. Install pressure alarm.

ItemStudy NodeProcess ParameterDeviations

(Guide words)Possible causesPossible ConsequencesAction required

FLASH DRUMFlowLow Valve fully openComponents are not fully separated.

Always check the condition of the valve

FLASH DRUMFlowHighValve opening too small

Flow of the product too slowInstall pump