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Steam blowing

Monday, March 12, 2018   By: Senguts [2245] 0 Stars
This is for a new project undergoing construction. We have a steam line of 6 inches size for spent caustic treatment . The steam pressure is around 50 barg at 425 deg c. We have welded ball valves in this steam line as per design.

We are in the process of fabricating the steam line and the next activity would be of steam blowing.

For steam blowing we normally remove all the valves and provide spacers. But in this case, being welded valves as per design, how such steam blowing operations are performed..Are there any other alternatives instead of steam blowing to ensure that there are no weld slags ..

For your information this steam is required for heating the spent caustic in a heat exchanger and there are no turbines in the downstream. After exchanging the heat and pressure reduction the low pressure steam gets connected back to the low pressure steam header.

Thanks to advise.

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Monday, March 12, 2018   By: Murphy [21] 4 Stars
I dont believe there is an alternative to steam blowing any high pressure steam line when it is being asked by the owner. Your 6 inch steam line is going to operate at 50barg or about 725psi with a superheat of 226c or 439F above 725psi saturated steam, so it seem like an important usage of steam power for the heat exhanger. I would think a short steam blow will suffice to remove what is loose or near loose. But I dont see how a steam blow on your application is going to bear any fruit beyond a 5-minute blow. I also dont see how a target will benefit you either, but a muffler might while still having the desired steam flow to remove debris. You are on the site and have a better appreciation for the conditions.


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Monday, March 26, 2018   By: senguts [2245] 0 Stars
Thank you Murphy. We can do steam blowing..But my worry is the possible impact on the trim components of the welded valves as these cannot be removed during steam blowing..Do you envisage such problems?

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Tuesday, March 27, 2018   By: Ross Burns [390] 5 Stars
I would like to say that I cant imagine a valves trim having an issue when valves are sized and classed right for the service, temperature and pressure rating. Of couse the valves need to be sufficiently maintained by qualified workers.


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Wednesday, March 28, 2018   By: Murphy [21] 4 Stars
Cannot for see a problem with the valving during steam blow.

Mr. Ross has expressed the qualifying points well which I think you have already considered.


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Published on steamforum.com


VWO, BMCR, TMCR, Full Load and Base Load
By: Jim Watts [764]

MCR is maximum continuous rating.

BMCR is the Boiler MCR, TMCR is the turbine MCR

VWO is valves wide open and at normal pressure allows the turbine to exceed TMCR by 5-10 percent

Full load is not fixed but means the turbine has reached it intended maximum

Base Load is also a flexible number and means the turbine will not be operated below that figure. It is mostly used in power system scheduling where the cheapest plants run fully loaded and are referred to as base load plants. O....   Read All
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