Calculation of steam loss due to traps
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The material transfer pipelines on the factory utility corridors are pre-heated using 0.2 MPa steam; one of the hang-down drum-type traps located before the drain line is damaged, resulting in severe steam leakage. I would like to calculate how much steam is lost per day If steam at 0.8 MPa is used, what will be the steam loss? Could some experts in this forum give some guidance or suggest a feasible calculation method?
A damaged steam trap means it no longer performs its function of draining water, allowing steam to escape directly. The diameter of the check valve is generally DN15. The density of steam at 0.2 MPa is approximately 1.12 Kg/m3, and the steam velocity is 15 m/s; therefore, the daily loss of steam is M = 0.785X0.015X0.015X15X3600X24X1.12 = 256.37 Kg. If it’s steam at 0.8 MPa, the density is 4.113 Kg/m3, with a steam velocity of 25 m/s; in this case, the daily loss of steam is M = 0.785X0.015X0.015X25X3600X24X4.113 = 1569.15 Kg
Thank you for ynzdj’s answer; I’ve learned something.
There are two questions: 1) How do you know what the steam velocity is? 2) The holes through which steam leaks generally don’t have the same diameter as the pipes, right?
How is the steam flow rate determined? What is its relationship with steam pressure? At the flange connection, should resistance be taken into account? Can it be calculated using statistical methods?
The steam flow rate on the 2nd floor should be taken based on the economic flow rate specified in the design manual; it is merely empirical data, not actual data from the site.