2017_IsolationKitCatalogNEW

REFERENCE

Selecting A Gasket The selection of isolation kits is an optimization process: corrosion management versus seal. The selection of a gasket suitable for the conditions may not provide the corrosion protection desired. When choosing a sealing device, it is best to follow a basic sealing design principle in which friction between the contact face and sealing device is kept at a maximum. The V-Series offers a retainer with an O-ring sealing element. For some, it is not intuitive to think that a small cross section O-ring can affect a seal. When designed with a proper closure and coupled with an adequate preload force, O-rings are capable of sealing at very high pressures. When extended beyond the bolt circle to the flange OD, the O-ring retainer prevents some flange rotation due to the initial bolt up. However, the gasket reaction diameter is located close to the bore. Flange deflection and loss of compressive force near the bore due to system pressure is difficult to calculate. ASME Non- mandatory appendix Y flange design indicates that the gasket reaction diameter should be located close to the bore in line with the pipe wall. Moving the gasket reaction diameter closer to the bolt circle to account for flange deflection moves the fulcrum, thus changing the moment. Design of flat face flanges without metal-to- metal contact is quite challenging.

To offer a simple explanation of sealing success: O-rings are designed to be deformed. The designer is interested in how much force is needed for a given deformation since this affects leak rate and the assembly procedure. Elastomers for dynamic seals have a hardness of 70 durometer to accommodate a lower friction force. Since temperature affects rubber’s elastic modulus, stress relaxation, expansion of the elastomer, and flexural modulus of the retainer, the prediction of an elastomers O-ring seal with retainer performance depends on a projected time-temperature-squeeze For full dielectric protection, it is desirable to avoid all metal-to- metal contact. To achieve this, the gasket should extend from the pipe bore as an I.D. to the most outside dimension as an OD. The sleeves should protrude just beyond the flange thickness into the isolating washers but no so much that by tightening the nut the two come in contact causing shear fracture of the sleeve. Because field conditions vary, i.e., flange to flange configurations, it is not possible to produce an exact sizing standard. If the measurements are to be exact, it is prudent to provide gasket dimensions well in advance of ordering allowing for manufacturing lead time and to cut the sleeves from tube in the field based on field measurements. We will do our best to accommodate your needs. history of the joint. Sizing Kits

Kit Labels

Kit Type

SERIES

LABEL COLOR

SAINT FERRER ® ISO S&W 4–150 105-EK1 P/N 105EK150-040

Size and Class

105

Yellow

221

Blue

Model No.

V-Series

Red

Part Number

Packaging

150#

300#

150#

300#

ISO Type F

ISO Type F

ISO Type E

ISO Type E

1/2"

20

20

20

20

3/4"

20

20

20

20

1"

20

20

20

20

1-1/4"

20

20

20

20

1-1/2"

20

20

20

20

2"

20

20

20

20

2-1/2"

20

10

20

10

3"

20

10

20

10

4"

20

10

10

10

5"

10

10

10

10

6"

10

10

10

5

8"

10

5

5

5

10"

5

5

12"

5

5

Westermann BG

11

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