With this method, you may select

· A suitable bolt diameter for typical bolted joint when the joint is used on a pressurized cylinder having a flanged clamped to the body of the cylinder by n equally spaced bolts.

   You may also obtain :

• Axially pressurized area of the cylinder
• The applied working load on each bolt.
• Bolt load produced by torquing
• Ultimate tensile for the bolt
• Required bolt area and diameter
• Spring rate of the bolt chosen
• Spring rate of the joint
• The portion of the working load that unloads the clamped joint
• Loss clamping force due to embedding
• Clamping force required for the joint

   Furthermore you will be able to:

  · Check the endurance limit of the selected bolt
  · Check your existing bolted pressurized joint modifying someone of the parameters as follows:
     - Bolt Ultimate strength
     - Number of Bolts
     - Vessel Internal Pressure
     - Internal diameter of the cylinder

Note:
- This method can be used to analyze bolted joints used in pressure vessels in many different applications-power plants, hydraulic systems, aircraft, marine equipment, structures, and piping systems.

Joint Sizes (Fig.1)

Fig. 1

Case 1: When most of the outside diameter of the joint is equal to or smaller than the bolt-head diameter, as when parts of a bushing are clamped.
Case 2: When the outer diameter of the joint DJ is greater that the effective bolt-head diameter or washer DW, but less than 3DH.
Case 3: When the joint diameter DJ is equal to or greater than 3DH.

Notes:
a. DJ = [0.5*(FOD - ID)]-wt
b. Endurance is defined as the ratio of fatigue strength to tensile strength.
c. The endurance limit is the highest stress or range of stress, that can be repeated indefinitely without failure of the metal. Usually ten million cycles of deflection is called "infinite life" and is satisfactory for determining this limit.

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EXIT DATA SHEET IS AS FOLLOWS :

INPUT FOR CALCULATION METHOD
SELECTING BOLT DIAMETER FOR
BOLTED PRESSURIZED JOINT*