**Application description: Cover for a Static Pressure Vessel, U. S. Customary Units (inches)**

- Inside pressure of 50 psi

- Bore diameter .500" ±.005

- Desired Maximum groove OD of .750" -.005/+.000

- .103" cross-section Quad-Ring® Brand seal

- Cover is flat

Ring Size | Cross Section | AXIAL Static Recommended Gland Depth "C" |
RADIAL Static Squeeze Groove With "D" +.005/-.000 |

Q4102 - Q4178 | .103 ±.003 | .089 | .115 |

**Determine the groove depth:**

Since the cover is flat, the groove depth is simply the gland depth. For this static application, the recommended gland depth from the table is .089.

Groove Depth = Gland Depth = .089 -.002/+.000

*For the purpose of this example, a tolerance on this dimension of -.002/+.000 is assumed.***Calculate the groove inside diameter.**From the table, the groove width for a .103 cross-section seal is .115 -.000/+.005.

Groove I.D. = Minimum Groove O.D. - (2 x Groove Width)

= .745 - (2 X .115)

= .515 -.005/+.000

*For the purpose of this example, a tolerance on this dimension of -.000/+.005 is assumed.*

**Calculate the Minimum Gland Volume:**Minimum Gland Volume = ((Min Groove O.D. - Max Groove I.D.) / 2) x Min Gland Depth

= ((.745 - .515 )/2) X .087

= .010 in2

**Calculate the Maximum Quad-Ring® Brand Seal Volume:**Maximum Quad-Ring® Brand

Seal Volume = (Max Quad-Ring® Brand Cross-section)2 X .8215

= (.106)2 X .8215

= .00923 in2

**Compare the Minimum Gland Volume to the Maximum Quad-Ring® Brand Seal Volume**

*In this application the maximum seal volume is less than the minimum gland volume, so the seal should function satisfactorily.*

**Calculate the Minimum and Maximum Seal Squeeze**Max Seal Squeeze = 1 - (Min Gland Depth / Max Seal Cross-section

a.

= 1 - (.087 / .106)

= .179 = 17.9%

**b.**Min Seal Squeeze = 1 - (Max Gland Depth / Min Seal Cross-section)

= 1 - (.089/.100)

= .11 = 11%

*Therefore, sufficient squeeze should exist to seal this application.*

**Select the Seal Size**

*Refer to the Selection Guide and turn to the section which lists the seals having a .103 cross-section. Since this is an internal pressure application, the seal OD should always be seated against the groove OD, which has a maximum size of .750. Since the Selection Guide Table provides seal ID information, determine the minimum required ID by subtracting the minimum seal cross-section:*

Min ID= .750 - 2 x Min seal Cross-section = .750 X (2 X .100) = .550

*A 4114 seal would always have a minimum ID greater than .550.*