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From my industry experience this is caused by the thermal contraction and expansion especially around mechanically jointed connections, vibration to some degree has a part to play but this is usually downstream of the discharge line, the constant fluctuations in pressure, which come with a temp change has its effects on the flanged joints.

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I would list -->> Thermal condition including high (during day) & low (during night) gradient, gas pressures, liquid carry overs (more on Natural gas pipelines) esp. during winter, longer period of exposures affecting gasket joints, acoustical pulses, improper supporting and valve gland condition.

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