Human maneouvring effort for closing a valve 1

[raton]

Hi All.
I have a question regarding the human maneouvring effort for opening and closing a valve.

I have an specification regarding the maximum permissible tangencial force based on the maximum lever and the handwheel diameter.

The application of this valve is for sea water in a submarine.

The values are as follows.

DN - Maximum Lever arm lenght - Handwheel diam - Force <20 - 150 mm - <120 mm - 120 Nm
<20 - 150 mm - <150 mm - 250 Nm
<20 - 180 mm - <350 mm - 350 Nm
<30 - 230 mm - >350 mm - 400 Nm

I wonder if there is any standard to check whether the above values are resonable.

Thank you very much for your help

Jaime

 

[raton]

Hi All.
I have a question regarding the human maneouvring effort for opening and closing a valve.

I have an specification regarding the maximum permissible tangencial force based on the maximum lever and the handwheel diameter.

The application of this valve is for sea water in a submarine.

The values are as follows.

DN - Maximum Lever arm lenght - Handwheel diam - Force

<20 - 150 mm - <120 mm - 120 Nm
<20 - 150 mm - <150 mm - 250 Nm
<20 - 180 mm - <350 mm - 350 Nm
<30 - 230 mm - >350 mm - 400 Nm

I wonder if there is any standard to check whether the above values are resonable.

Thank you very much for your help

Jaime

 

[ornerynorsk]

You could set up a simple bench experiment using a torque wrench and some appropriately sized improvised handwheels. Having the tactile feel to associate with the numbers will be very helpful to you.

 

[MintJulep]

MIL-STD-1472 had that sort of thing.

 

[IRstuff]

This might be more useful: Defence Standard, Human Factors for Designers of Equipment, Part 3, Body Strength and Stamina which contains tables of range of motion and strength

TTFN

FAQ731-376

 

[moon161]

YMBFK. I set 110 Nm on my brake rotor w/ a foot long (300 mm) torque wrench and that was a gutbuster. When I set 200 Nm on my main crank bolt, that required 2+ ft (600 mm+)and a he-man yell.

A young man about to die may swing this, but design for more reasonable day-to-day operating forces.

 

[DLite30]

Just do the math yourself with the values you have...the force required all come to about 800 N or more (where 800 N~180 lbf). Unreasonably high operating force in my opinion. I would say 50 lbf actuating force would be more appropriate.

Those are relatively small handwheels as well, so a person would be able to apply as much force compared to a larger hand wheel, where you could use your body more....with the small ones it's all your arms.

 

[raton]

Thank you very much for your help.
It is much appreciated.

Cheers

Jaime

 

[Cockroach]

Personally, I prefer to see the Technicans sweat when they cycle a manual valve closed. But that is just me.

Else the operator would of specified a BGO and automate the valve cycle, as cheap as they are.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

 

[raton]

He, he.
Thanks for the info.

I have found a french standard for the torque:

NF E 29-470

Thank you very much

Jaime