Welcome Guest! The IOSH forums are a free resource to both members and non-members. Login or register to use them

Postings made by forum users are personal opinions. IOSH is not responsible for the content or accuracy of any of the information contained in forum postings. Please carefully consider any advice you receive.

Notification

Icon
Error

Options
Go to last post Go to first unread
Admin  
#1 Posted : 22 February 2001 17:10:00(UTC)
Rank: Guest
Admin

Posted By Anto
Hello all

I am interested in finding out about using heart rate and Ecg as methods in work load assessment with particular attention to clean rooms. Does anybody have information in this regard??? Many thanks.
Admin  
#2 Posted : 25 February 2001 22:10:00(UTC)
Rank: Guest
Admin

Posted By Stuart Nagle
For information, the breathing rate used to assess the duration of breathing apparatus is 40 litres per minute.

This standard was devised some years ago by the Fire Service in tests (of presumably fit persons) walking a 5mph and employed open circuit breathing apparatus and full face masks.

The calc is

Bar pressure of cylinder X Cylinder contents in litre (water content marked on cylinder) divided by 40 (litres as above) this will give the standard duration rate for the BA at this use rate.

So, in your clean air environment, if BA is used, you can;

1) calculate flow rates required + safety margin for air-line hose delivered systems, and,

2) calculate durations for escape purposes, if necessary where for example you have escape of toxic or other nasties (important if you want to be able to get out of the laboratory alive and its some distance to safety

Obviously, work rates will increase usage of limited air supplies, and duration will depend on a number of factors, such as;

fitness / leaks from facemasks due to beards or facial hair / Face-mask fit (women have smaller faces and are more prone to leakage and ill fit of masks/ work type / heat and stress / type of work being performed e.g. heavy or light etc...etc...

Hope this is of some use !!

Stuart Nagle
Admin  
#3 Posted : 26 February 2001 20:20:00(UTC)
Rank: Guest
Admin

Posted By Anto
Thanks stuart,
I need to do a little more reading before I can decide or comment about what you have said.

Kind regards
Anthony
Users browsing this topic
Guest
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.