The convolution pitch is the distance between the tops of successive bellows convolutions. This is referred to as q in the ASME Code.
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Dim |
Description |
Sketch |
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Af |
Cross sectional metal area of one reinforcing fastener. |
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Db |
Inside diameter of bellows convolution. |
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Dm |
Mean diameter of bellows convolution. |
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Dr |
Cross sectional diameter of the reinforcing ring. |
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Lc |
Bellows collar length. For the toroidal bellows, Lc is determined by dividing the collar cross section area with the collar thickness. |
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Lf |
Effective length of one reinforcing fastener. |
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Lt |
End tangent length. |
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Lw |
Distance between toroidal bellows attachment welds. |
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q |
Convolution pitch. |
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r |
Mean radius of toroidal bellows convolution. |
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t |
Bellow nominal thickness of one ply. |
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tc |
Collar thickness. |
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w |
Convolution height. |
