Page 56 - Design Criteria.qxd

57 ® Welcome to the Next Generation of Sealing Technology
Male and Female
Ordering FLEXITALLIC Gaskets for Special Flange Designs
In order for FLEXITALLIC to design a gasket suitable for the application, it is imperative that complete details be submitted for review.
The information we require is the following:
1. Type of Flange facing
2. Dimensions of the gasket seating surfaces
3. Number, size and material of bolts
4. Bolt circle diameter
5. Operating pressure & temperature (Process material if known)
6. Hydrostatic test pressure
7. Initial bolt pre-stress
8. Customer preference on gasket materials
FLEXITALLIC supplies engineering data sheets at no cost on which this information may be submitted. As a gasket manu-
facturer, it is impossible for us to review every flange design to make certain that flange rotation and flange stresses are within allow-
able limits defined in the Code. We proceed on the assumption the design engineer has followed the design criteria established by the
ASME Boiler Code and that the flanges are sufficiently rigid under the most severe condition to preclude the possibility the gasket
could become unloaded either during operating conditions or hydrostatic test conditions. We are aware that most flange designers do
not take into consideration flange rotation at test conditions prior to finalizing his design. We also, of a practical necessity, must assume
the bolt material being used is adequate for all conditions including operating pressure at operating temperature and hydrostatic test
pressure at ambient temperature.
The use of the optimum material for bolts is a very complex subject and we suggest reviewing currently available technical lit-
erature for guidance in the proper selection of bolting material for piping and pressure vessel applications.
GASKET ENGINEERING DATA
Company ______________________________________________ Date _______________
Address _______________________________________________ Order/Inquiry No. _______________________
SERVICE CONDITIONS CUSTOMER PREFERENCE FLANGE DESCRIPTION FLANGE DIMENSIONS
Operating Pressure _______psi Gasket Material _______ Figure _______ Material _______ A _______” T _______
Operating Temp _______°F Gasket Filler _______ Welding Neck _______ Threaded _______ B _______” No. of Bolts _______
Substance to be sealed _______ Ring Metal _______ Lap Joint _______ Sketch (Back) _______ C _______” Size of Bolts _______
Unusual condition _______ Gasket Style _______ Slip On _______ Print Attached _______ D _______” Bolt Material _______
Blind ______ Surface Finish _______rms
C
B
T
C
T
T
Raised Face or Van Stone
Smooth Face
Tongue and Groove
Groove to Flat Face
A
D
T
D
T
D
T
D
Male & Female with Spigot
A
C
A
C
B
A
C
B
A
C
B
A
B