|
 |
Vent
sizing and Emergency Relief System Studies are undertaken to verify the proper
equipment and/or safety precautions utilized during the processing steps. To achieve
this objective, the 'study-scope' specification usually covers the aspects of
vapour relief calculations, reaction hazard assessment and may include or exclude
decomposition reactions depending on the requirement. The study consists
of a number of discrete tasks shown below. The fire engulfment calculations form
the most straight-forward aspect of the study. The chemical reaction hazards study
is a considerably more detailed task and is usually broken down into a larger
number of discrete tasks. This study requires basic data information on the processes
also. Some indication of the tasks undertaken as part of the study are shown below:
Task
1 : Vent Sizing for Fire Engulfment Emergency Relief Vent Sizing Procedure:
A
number of distinct steps are common to all emergency vent sizing studies. These
are: -
Identification
of credible worst case scenario -
Characterisation
of the fluid reactivity at relief conditions -
Characterisation
of the fluid behaviour during the relieving process -
Nature
of discharge (single, multiphase flow) -
Choice
of design methodology -
Choice
of relief device and its set pressure -
Calculation
of energy/mass flux to be discharged -
Calculation
of the vent nozzle and pipework mass flow capacity -
Application
of safety factor (if needed) -
Mechanical
design aspects / disposal system design
Various
aspects of the study may include: Design Approach, Vessel and Vent Line Dimensions,
Fire Heat Input, Venting Fluid, Vessel Inter-Connectivity and Common Mode Failure,
Mechanical Thrust Calculations etc. Next
| Chilworth Technology Private Limited Plot 3, Pocket B-2, Muskaan Complex,
Vasant Kunj, New Delhi-110 070, India. Tel.: 011-26136979 Fax: 011-26135979
E-mail:
info@chilworth.co.in Privacy
Policy
| |