TG downstream of cooler for plan 53 B
TG downstream of cooler for plan 53 B
(OP)
Hi guys, as per API 682 TG downstream of cooler is not mandatory as phrase "IF SPECIFIED". Based on your experience, is there a benefit installing this TG or just a waste of money..thanks..





RE: TG downstream of cooler for plan 53 B
What is the application perhaps we can give you a more informed comment.
Cheers
RE: TG downstream of cooler for plan 53 B
RE: TG downstream of cooler for plan 53 B
However, for troubleshooting, it is nice to have an indication of both inlet at outlet temps, to ascertain whether there is sufficient flow.
RE: TG downstream of cooler for plan 53 B
Cheers
RE: TG downstream of cooler for plan 53 B
Pls comment on attached seal plan drawings...thnks...
RE: TG downstream of cooler for plan 53 B
If you have a thermometer, the operators have to have a limit so that they know when to take action and what action to take.
Johnny Pellin
RE: TG downstream of cooler for plan 53 B
Aside from the good points made about temperature measurement, just one word of advice:
Make sure that air cannot be injected into the system when filling. This calls for a quick connect arrangement installed on the filling point and fill hose and/or a very robust filling procedure which must be adhered to by the operators.
Air injected into the system when filling will find its way into the loop and from there be centrifuged across the faces causing damage.
RE: TG downstream of cooler for plan 53 B
RE: TG downstream of cooler for plan 53 B
RE: TG downstream of cooler for plan 53 B
RE: TG downstream of cooler for plan 53 B
A temp gauge on the outlet only tells you that something might not be right. If you take all those temps and look at the data, it should narrow things down.
RE: TG downstream of cooler for plan 53 B
RE: TG downstream of cooler for plan 53 B
There is no requirement for a support bsystem for a dual pressurised seal to be self venting.
1Gibson - Both the methods you suggest are OK. Remember though that a) the IR gun must be used properly (i.e. with reference to the measurement spot size vs. distance)and set to the correct emissivity to achieve meaningful results and, b) temperatures taken from the surface of the pipework should typically be increased by around 15 ~ 20 degK to reflect actiual fluid temperature within.
RE: TG downstream of cooler for plan 53 B
I will argue that a differential temp reading is more valuable in this context than knowing exact fluid temp from a single temp gange. The most important information is component temp and relative temperatures; temp rise across seal, temp drop across cooler.
These will indicate any problem with components, or any condition that is different then "normal operation." Really, you are looking for something to be "hotter than usual." With one temp reading, the cause could be high ambient temp, high cooling water temp, high process temp, rub in the seal, or fouling of cooler.
A couple stick on liquid crystal thermometers will tell you who/when/where and reduce the what/how to something that can be answered by anyone with a simple troubleshooting checklist.
You could even stick them on an employee's forehead to see if they need to take a sick day, or in their desk chairs to see if they've spent too much time chatting at the water cooler!
RE: TG downstream of cooler for plan 53 B
Personally I am in favour of the liquid crystal thermometers, although when I suggested them to my company in the mid 90's, they did not agree to adopt them. (They were sold in minimum quantities and the bean counters didn't want to make the initial outlay - fools.)
The point I was making in response to your first post was that it is also important to keep an eye on the maximum temperature, since the majority of barrier/buffer fluids will start to degrade above around 80 degC and water tends to lose its lubricity and may flash across the seal faces above the same temperature - so whatever method of skin temperature is utilised, it is important to keep in mind that the actual fluid temperature inside the pipe/tubing will be somewhat greater.