Hi Robert,
Try change these values too as they've been set for maximum heat, my values will cause the boiler to slowly build pressure.
boiler-efficency 0.861
boiler-efficency-min 0.454
boiler-efficency-idle 0.667
If safeties still keep popping and staying on keep increasing boiler-heat-loss, most of my steam locomotives are rated from 120PSI to 140PSI with a very few from 160PSI to 175PSI boilers, so my values are based for those pressures.
Cheers.
We are on the right track. I changed these values, went over 5 miles, including a stop to let an AI train go by for about 2 minutes, and a speed averaging 15 mph, and the safety valve was as quiet as a church mouse the entire way. Here is what I wound up with for engine spec settings.
USRA 2-8-8-2 TS12 Loco Kuid <kuid2:243294:1299:2>
Engine spec Kuid <kuid2:243294:1317:2>
Modifications to Engine spec in red.
steam
{
number-cylinders 2
number-power-strokes 2
firebox-heating-surface-area 31.99
boiler-volume 21.87
steam-chest-volume 0.6413
steam-chest-max-flow 240.09
max-fire-temperature 790
min-fire-temperature 600
initial-boiler-temperature 470.2
max-coal-mass 1215
ideal-coal-mass 608
shovel-coal-mass 24.3
safety-valve-low-pressure 1773
safety-valve-high-pressure 1809
safety-valve-low-flow 5.13
safety-valve-high-flow 15.4
water-injector-rate 8.48
piston-volume-min 0.015048
piston-volume-max 0.316015
piston-area 0.5361
burn-rate 1.026
burn-rate-idle 0.01026
speed 17.88
boiler-heat-loss 0.85
blower-max-flow 0.203
piston-angular-offsets 0.1,0.8854,1.6708,2.4562
firebox-thermal-conductivity 17
firebox-plate-thickness 0.019
super-heating-constant 100
firebox-efficiency 0.9
blower-effect 0.2
boiler-efficency 0.761
boiler-efficency-min 0.454
boiler-efficency-idle 0.667
valve-lap-percent 0.1
cutoff 0.55
hand-brake-max-force 5.9
Now anyone can download this loco from the DLS, which already has the engine spec in it, and then modify the engine spec. You have to remember every time you make a change in the engine spec, you have to delete the loco in your session and reinstall the loco in the session, before the new spec will take effect. After that, you can just load the same loco into any session. The silence from the safety valve is wonderful. In fact, in this screen shot about 6 miles out, I was waiting for an AI loco to pass, and it was going PHTRT..PHTTT PHHHTTT..PHTTTT PHTTT, and my loco was not making a peep. I could hear my fireman saying" I wonder who the jerk is in that loco"??????? :hehe: