Recent content by learner08

Hi!! Can anyone help me on this question. I am looking at a vortex flowmeter and the transmitter load line resistance is given as max 550 ohm at 24V? Does this mean the signal output from the transmitter can drive a max load of 550 ohm at 24V or 43.6mA? How is this important when I source...

Hi! Simple question for you guys but one which I am not too sure of and need you help.... For example a control valve with 4-20mA input, and a load resistance of 300ohm, how do we use the 300 ohm load resistance information... It must be for selection of controllers but I am not too sure...

hi biginch! thanks for your reply. let me check if i understand u correctly .... if i need say 0.2 barg and 500 ml at my fartherst user, i need to ensure that my pump is able to pump the presssure of (0.2+pressure drop up to fartherst user) at a flow of at least 2500ml (assuming 5 users...

Hi, Need advice. Assuming I have a double acting diaphragm pump operating at say 3 bar (directly at pump outlet) with 1 inch main line and there is a 2 bar pressure drop to my user (based on pipe rise and losses through piping). Assume based on pump curve at 3 bar pressure i can hv flowrate...

Hi CJKruger and All, There is no way I can have vacuum currently as the control valve is in manual operations and about 100% open meaning 10barG all the time to push against any back pressure!

Hi CJKruger, I am sure there isn't a back pressure problem as the condensate goes back to an open tank with minimal lift (the control valve is fully open at the time). Also the same phenomena occurs even when I open the by-pass valve immediately after the trap (which goes to atmosphere)...

Hi TBP, The float trap I am using has a bimetal for the release. It was rightly selected for the superheated steam I am using. I understand the ramnification of thermo element in a superheated environment and have avoided using the thermo type as such. Still no 'less painful' way of putting...

Hi Katmar, I certainly believe your statement that most of the heat transfer occurs in the sensible heat txf region as opposed to the latent heat region in my case as previously when we had a leaking trap in the exact system, the heat transfer was in fact better (as compared to a good trap and...

Hi! Need some help. I've got a heat exchanger using superheated steam (10 barG at 210 deg C) to transfer heat (I know its supposed to use saturated steam but thats the way it is sadly and not able to desuperheat for the moment!!). My problem is the system isn't functioning. I have confirmed...

Hi All, Any help is welcome. Talking to ppl, I understand that for steam systems, there is a difference when a person says they want pressure control or when they want temperature control. But then, for sat steam, isn't pressure and temp fixed? Also, in this context, certain valves are...

Would appreciate anyone's help. Thanks in advance. If a valve is supposed to be say Class 800, what does it mean? I am sure it is related to pressure and temperature but do not know the exact meaning. Also if I have a valve with known capability to handle a known pressure and temperature...

Hi All, Want to know if for example we have X kg/hr condensate at Y barG pressure to be discharged to a return of Z barG pressure, how do you calculate the the size of pipe required at the outlet? There is going to be 2 phase at the outlet with these conditions. I am not looking for any...

Anybody knows the typical droop for both? Want to know this as would like to know if I am presented with both options, whne should I pick either or? Been readind thru books and they only give qualitative criterias and not quantitative. Thanks.

TD traps are usually not recommended for outdoor application. However, if for one reason or another a TD trap needs to be installed in an outdoor application, the control chamber needs to be protected/insulated. TLV manufacturers TD traps which comes readily with insulated control chamber.

Hi! Would like to get a definition for hysterisis. Looking it up gives 2 definition. 1. lagging behind of flow upon movement of valve 2. difference in measurement for the same amount of flow measured when flow is increasing against when flow is decreasing. Does the context in which it is...