I know 0 Kelvin = -273 degC, but if you have got a rate specified as 140 K/hr, would that be the same as 140 degC/hr which I think is correct. But if I convert the 140 K into degC, I'll get -133.15 degC but the rate is still 140 degC/hr. Why can't I just convert the K to degC to get the K/hr to...
I know it is not allowed to use any other materials for ASME-I design other than ASME - II Part D. But from my understanding, the repair jobs are done to NBIC -part 3. Due to difficulties in sourcing ASME materials for a very short length tube, I'm contemplating using EN materials. I was just...
That's what I thought initially that you could control the pressure as well as flowrate. But looking at the datasheet above and a lot of other datasheets the inlet/outlet pressure stays constant and only the flowrate changes. This is a contradictory information. I just need to make sure this...
LittleInch,
Thanks for your reply. Receiving the control valve (globe) spec, it seems you can only change the flowrate and not the pressure?
Looking at the data below, the inlet and outlet pressure are constant at 1500 & 400 kg/hr. I am looking for a valve that could change both the pressure...
I know by using globe valve I can control the flowrate at a constant pressure drop. However, I am looking for a valve that can change the flowrate at different pressure drops. I got a 20 m line with enters to various boilers at different segments. For example, at boiler number 1, 2, 3, the...
From my understanding, a flow control valve is a globe with an actuator on it. From Crane book, I found the equation for the K value of 340 x ft. ft = friction factor. Using this equation I get a pressure drop of 0.018746781 bar. However, my colleague was saying he always uses 1 bar pressure...
The exhaust gas from the engine is passed through, inlet duct, bundle of tubes, and outlet duct, in a smoke tube boiler. How can I calculate the reduction in noise level? Thanks.
By tube sheet support, I mean the helical tube is supported by the tube sheet. The water is inside the tubes. Plus, how the coefficient of friction changes with increase in temperature? On engineering toolbox website for steel to steel it's 0.5 - 0.8 which sounds very high. Thanks.
Thanks chicopee for your response.
The boiler is an economiser (water tube boiler). ASME-I doesn't explicitly mention sagging or bending stress, however, looking at PG-22 Loadings it requires to consider any additional loading, hence bending stress needs to be considered.
Again, I can't find...
Thanks metengr,
To understand this correctly 'shall' means I'll have to use it as the design temperature and in the second line it's only recommended, hence it's not necessary to use it.
In old ASME - I, the minimum design temperature was 700 degF (371.2 degC) - in which edition did it...
Metengr - in that paragraph in the first line it says the mean metal wall temperature and then in the second line which is related to tubes that do not absorb heat to use at least the saturation temperature. In my case the tube is absorbing heat, does that means I can use the mean metal...
The sag is caused by the long length of the span between the supports, tube weight, and inversely proportion to the tube thickness. My question is what is the limition of the sag that you can have, and what are the detrimental effect of having a sag?
Looking at para-27.4.2, in the first line it says the temperature is the mean wall temperature and then in the end of the second line it says it should be higher than the saturation temperature of the fluid (tubes that do not absorb heat).
For example: Case - tube that absorbs heat.
The mean...
Thanks for the reply. In para 121.5, it mentions the excessive sag but doesn't define what the excessive sag is? In addition, general notes of table 121.5, it mentions the sag is limited to 2.5 mm but again that only applies when the calculations are not made. What is the detrimental effect of a...
Another related question, is it necessary to use hot modulus to calculate the deflection? The hot gases are flowing around the tubes, and there is hot water at high pressure inside the tubes.
