Is a chart available that can give the expected temperature of steam leaving the outlet of a defective trap when given the steam pressure entering the trap?

The chart would be the "Water Make up GPM" at the boiler to indicate poor condensation return from a trap. Is not a steam trap used for condensate return. I know of know guages to read both side of the trap, or what good that would do. Try a relief or blow-off valve on each side!

Don,
Not knowing your level of trap knowledge let me add this to the thread
Are you looking for such a chart for design purposes or trap failure recognition with IR? I have never seen such a thing but have always gone with this rule:
The wider the temperature range between the inlet and outlet sides of any steam trap then the more likely it is functioning correctly. Naturally this rule is driven by volume of steam used in the process, type of trap / piping, location of the trap in the piping system, and other variables.
For our plant, IR is used as a means to quickly “scan” not “inspect” the delivery system. When the temperature change from side to side is negligible or extreme if the trap is in use, those traps are marked for ultrasonic inspection.
Ultrasonic tools are the best for detecting trap condition but take a trained ear and experience along with knowledge of how each type of trap functions. Considering where a lot of traps are located, “touching” every trap during an inspection is very labor intensive. “Infrared Scanning” quickly separates the good traps from the suspect traps. Suspect traps can then be marked for “Ultrasonic Inspection” and handled accordingly.

Don,

Yarway offers the attached file on their website.

Additionally, we have been monitoring our steam traps for many years using Raytek/Fluke Infrared non-contact thermometers. You can hook it up to a data collector, if you want. We have developed pretty tight acceptance criteria for the readings and can easily tell when there are problems like clogged mud legs, strainers, etc., traps blowing by, traps not operating properly, etc.

YAWMC-0432-US.pdf (558 Kb, 75 downloads) Yarway - Simple Techniques for Surveying Steam Traps

noisemakr,
I have some knowledge and will be starting steam trap surveys in the near future. The problemn I have is the various steam pressures I will be evaluating, with and thought if such a chart was available that would help in discussions with supervision to show the defective traps and help making a call for a failure. The idea would be if inlet steam pressure is 190 psi and outlet pressure is 15 psi then inlet temperature is +-390F and the outlet temperature will be +-200F and so on.

The tools I have used and are at my disposal are ultrasonic and thermography.

It looks like the yarway article from Jamie Dugan is what I am looking for. Thanks Jamie!
This will be a good start.

Jeff,
For our systems we have many condensate return lines and the water is not necessarily flowing immediately back to the boiler. Our system feeds back to a softener or condensate tank through a header system and the condensate tank is vented.

Thanks for the info!

Table II in the Yarway article is the same as Fig. 7-5 on page 240 of "The Steam Trap Handbook" by James McCauley

Walt