How to calculate the flow rate of steam discharged directly into the atmosphere in a 1.0 MPa steam pipeline network?

The volumetric flow rate of steam required and the pipe diameter, right?

There are many factors to consider; referring to the calculation formula for the discharge volume of safety valves makes things a bit simpler

This post was last edited by goldliyang on 2016-12-27 at 20:01. The volumetric flow rate of steam is calculated by dividing the mass flow rate of steam by its density or by multiplying it by its specific volume (as determined from tables based on pressure and temperature); the steam discharge velocity is then obtained by dividing the latter value by the cross-sectional area of the discharge pipe. It’s a shame to discharge it directly; it should be recycled instead-

Are the emission volume and pipe diameter known?

What are some of the simpler calculation methods?

It’s sufficient to know the emission volume and pipe diameter

It is mainly used to calculate the steam flow within the furnace tubes during purging or heating of steam pipelines; therefore, I would like to know how to carry out such calculations

It can be calculated using Bernoulli’s equation

This post was last edited by fanbutao on 2017-1-7 at 10:33. Steam at 1.0 MPa is released into the atmosphere; at this point the fluid has reached a critical state, with a flow velocity equal to the speed of sound. (In simple terms, critical flow is reached when the pressure downstream is less than 55% of the upstream pressure); in this case, there is a sudden change in pressure at the outlet of the pipe. The pressure before the mutation is the critical pressure (the calculation method can be found in fluid mechanics), while the pressure afterward is atmospheric pressure. Without the use of necking and expansion tubes, the gas can only reach the speed of sound, and its pressure can only be reduced to the critical pressure. It can also be said that if the gas reaches critical flow, the volumetric flow rate depends only on the properties of the fluid upstream (temperature, pressure), and not on the conditions downstream. The most typical example in engineering is the safety valve. Regarding the original poster’s question, if there is no multi-stage pressure reduction process between the 1.0 MPa steam system and the atmosphere, then, as mentioned by the user in floor 3, it is sufficient to refer to the calculations for safety valves. By directly calculating the sound speed of steam at 1.0 MPa, the flow rate can be determined