The metal expansion joints manufactured by FLEXILATINA DE COLOMBIA are calculated according to the EJMA standards, the ASME BPVC SECTION VIII code and/OR ASME B 31.3.
Each of the metal expansion joints manufactured is supported by its respective data sheet (Data sheet) and the calculation of the bellows according to the respective code.
TERMS USED.
Information provided
DN. Nominal diameter.
DB. Internal diameter of the bellows.
t. Bellows material thickness.
W. Bellows wave height.
q. Passage between waves of the bellows.
Lt. Tangent length.
P. Design pressure.
T. Design temperature.
▲X. Axial movement (Extension or compression).
▲Y. Lateral movement.
▲ß. Angular movement.
Ebh. Modulus of elasticity of the bellows material at design T°.
Ebc. Modulus of elasticity of the bellows material at ambient temperature.
Ec. Modulus of elasticity of the collar material (if used).
Sat. Allowable stresses of the bellows material.
Sac. Allowable tension of the collar material.
Sy. Elastic limit of the bellows material.
Calculations performed.
Stresses due to internal pressure.
S1. Tension in the circumferential tangent membrane.
S1′. Tension in the circumferential membrane of the collar.
S2. Tension in the circumferential membrane of the wave.
S2-E. Tension in the circumferential membrane of the final wave.
S2-I Tension in the circumferential membrane of intermediate waves.
S3. Tension in the southern membrane of the bellows.
S4 Meridional bending stress of the bellows.
Stresses due to deformation.
S5. Tension in the southern membrane of the bellows.
S6. Stress due to meridional bending of the bellows.
Nc. Number of useful life cycles, due to fatigue.
Psc. Internal pressure limit due to spinal instability.
Psi. Internal pressure limit due to plane instability.
Phew. Theoretical axial constant of the bellows.
Frp. Reaction force due to internal pressure.
Fx. Axial force in the joint.
Fy. Lateral force in the joint.
My. Lateral moment at the joint.
More Angular moment at the joint.