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• # Blast Height

Discussion in 'Calculations' started by LandroverDom, Sep 28, 2010.

1. ### LandroverDomMember

Joined:
Sep 2010
Posts:
5
0
Hi

I am currently involved in a project for the construction of a new pressure vessel. The design is being fully checked by persons accredited to check againt the applicable design code to ensure 100% safety and complience so no concerns on that point.

This vessel is fairly large and the pressures / forces are significant.

Someone in the office asked a questien "if the cap blew off how high vertically could it reach?". Whilst every effort is being put in place to ensure this can never happen it made me realise that I am a bit sketchy on how to go about making the calculation and I am also interested in what the answer would be.

I think the criteria that would be needed for the calculation is as follows.

Weight of cap assembly = 950kg
Pressure inside vessel during Hydro Test = 33,031psi
Bore diameter = 400mm
Area on cap pressure is acting against = 128825mm^2
Medium inside vessel = Hydraulic Oil
Calculated oil compression inside vessel = 18 liters

So at test pressure the force trying to blow the cap off I get to be 28,082Kn (just less than 2900 tons!)....pretty huge!

This cap will not fail but theoretically if it did I would be interested in how to calculate the initial MPH of the cap travelling vertically upwards (the vessel is mounted in the vertical) and what would be the maximum height achieved and I guess how long would it take to achieve maximum height.

I expect the answers will be farly shocking?? I would like to know how to calculate the answers from an interest point of view but also to advise operators of whats involved with this vessels and to stress the importance of following procedures and to never cut corners etc etc.

Many Thanks

Dom

2.
3. ### mvalentiWell-Known Member

Joined:
Nov 2009
Posts:
257
0
fairly high.

Joined:
Oct 2009
Posts:
67