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[logoman]

I've been trying to understand the positioning and size of ventilators, but am having trouble. Could anyone explain the principles?

[derekwarner]

logoman....in lay terms....we need to understand the purpose of the ventilators

1) to provide an exchange of air
2) to provide a method of heat removal
3) to provide a higher air pressure [over atmosphere] for the purpose to aid combustion
4) ventilators usually had a worm & worm wheel so they could be aligned at the prevailing breeze or wind direction irrespective of the vessels path or direction
5) even if the vessel is stationary the velocity of 'air' is captured in the funnel like structure admits the air to where the lower pipe work is located

Dependent on the velocity of the breeze.....this admission of air to a closed chamber would increase the air pressure by say 2 PSI above atmosphere....but this serves no purpose unless we can allow spent or hot air to escape....hence having the engine skylight vents open & hence a continual convection of changing air flow

So for boiler rooms the ventilators were to aid combustion, but engine room ventilators were to expell hot air

In addition to conventional ventilators as shown, venturi type vents were also used.....the attachment is self explanatory as the same breeze is harnessed to 'suck' spent or hot air out of the enclosed space...........Derek 

[logoman]

thank you very much Derek, that helps a lot. 

[BarryM]

I've got to wonder if Derek is a naval architect at heart; nowhere is the need to stop engineers becoming little greasy spots on the plates mentioned. Engineers were generally expected to survive without oxygen at temperatures where a match would self-ignite and at humidities similar to a rain forest.  

When machinery spaces became heavily automated, air-conditioned control rooms were installed not to make the engineers life easier but to keep the banks of electronics and pneumatic gear cool. I recall a C/E who would have switched off the air-conditioning if he could ("Didn't need it in my day") until persuaded that the effect on the instrumentation controls would be undesirable. He retreated to his (air-conditioned) cabin muttering having decreed that the chairs should be removed from the Control Room. Needless to say, that decree was also ignored.

Barry M

[steamboatmodel]

When machinery spaces became heavily automated, air-conditioned control rooms were installed not to make the engineers life easier but to keep the banks of electronics and pneumatic gear cool. I recall a C/E who would have switched off the air-conditioning if he could ("Didn't need it in my day") until persuaded that the effect on the instrumentation controls would be undesirable. He retreated to his (air-conditioned) cabin muttering having decreed that the chairs should be removed from the Control Room. Needless to say, that decree was also ignored.
Barry M

Even with old Stationary Engineers "Standing a Watch" meant that, until we pointed out that all the display screens could only be read sitting down.
Regards,
Gerald. Former Building Operator.

[Bunkerbarge]

I once sailed on a cargo ship going down the west coast of Africa.  The second engineer decided that now was the time to clean the cooler on the control room AC unit so he shut the unit down and pulled the cooler apart.  Before too long the temperature in the control room had become so high that everything started to seriously malfunction to the point where everything shut down and we were dead in the water. 

Needless to say everything had to be quickly put back together to try to restore everything.

[derekwarner]

Apologies Barry M.............

1) to provide an exchange of air was intended to convey & promote engineering life or maintaining life of the engineers in the E/R or B/R .. 

So a poor selection of words on my part as humble Irish convict stock peasant...I should promote the virtues I post  .......Derek