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The regulations say "the test shall not be conducted if there is any hair growth between the skin and the face piece sealing surface such as stubble beard growth, beard, mustache or sideburns which cross the respirator sealing surface".
The plastic strain of the first sealing surface, PSfirst, and that of the second sealing surface, PSsecond, should be as low as possible.
As the leakage is blocked by the second sealing surface, no water outflow can be seen.
There is also a minimum contact width for the sealing surface, otherwise leakage will happen.
The decrease of variance makes the contact of sealing surface more uniform and the increase of the contact pressure makes the contact of sealing surface continuous, which improves the sealing performance considerably.
Figure 11(b) shows the variance of second sealing surface, (S_{text{second}}^{2}), along with the number of iterations.
Similar(14)
The contact pressure and contact width on sealing surfaces are two important parameters for keeping seal work well [29, 30].
When two sealing rings shrink in the radial direction, two sealing surfaces will be created by the squeeze between internal surface of sealing ring and external surface of pipeline.
Wear loss, friction torque and surface temperature of sealing surfaces have been measured under dry, water and steam lubrication conditions.
At the optimal point, because of the decrease of the variances of the contact pressure, the contact uniformity on two sealing surfaces will be improved significantly.
The axial clamping forces push the press ring to the position limit, sealing surfaces are formed, and the repair is done.
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CEO of Professional Science Editing for Scientists @ prosciediting.com