Search found 1637 matches

by fredrosse
Tue Feb 18, 2020 4:08 am
Forum: Technical - Engines and Boilers
Topic: digital steam engine indicator
Replies: 70
Views: 34158

Re: digital steam engine indicator

Me too. Electronics are not any strong point for me, but I do have four electronic pressure transducers, rated to 100 psi, with a claimed response time of 0.001 seconds. Would love to be able to make Pressure-Stroke diagrams for my engines.
by fredrosse
Fri Feb 07, 2020 3:47 pm
Forum: Technical - Engines and Boilers
Topic: boiler size
Replies: 4
Views: 334

Re: boiler size

Clarifications requested: Boiler tubes Outside Diameter = 1.5 inches? Wall thickness = 0.095? Length = 20"? This is a simple VFT, similar to a Stanley boiler, or a wet firebox type? If a wet firebox type, what is the inside diameter of the firebox and its height? What is the displacement of the new ...
by fredrosse
Mon Jan 06, 2020 8:42 pm
Forum: Technical - Engines and Boilers
Topic: VFT tube leak
Replies: 54
Views: 1942

Re: VFT tube leak

Yes, my mistake, miss-typed 210C vs 110C, which corresponds to 0.42 Barg I usually say to the reviewer "I put that mistake in the calculations just to be sure you were paying attention" In calculations I have often done exactly that, but I correct the numbers shortly later with another "mistake" Int...
by fredrosse
Mon Jan 06, 2020 12:36 pm
Forum: Technical - Engines and Boilers
Topic: VFT tube leak
Replies: 54
Views: 1942

Re: VFT tube leak

Again from Mike: "I steam up when still on the trailer due to launch ramp congestion and have always had difficulty timing things so that, on one hand, I have enough pressure to back off of the trailer and, on the other hand, don't have to deal with the relief valve roaring away while I'm trying to ...
by fredrosse
Mon Jan 06, 2020 3:30 am
Forum: Technical - Engines and Boilers
Topic: VFT tube leak
Replies: 54
Views: 1942

Re: VFT tube leak

From Mike: "What I didn't understand was why the subsequent rise is so lethargic at first. And stays fairly slow for a relatively long time. And then all hell breaks loose." ANS: The reason for rapid pressure rise when approaching operating pressure is the steam saturation pressure/temperature curve...
by fredrosse
Sun Jan 05, 2020 5:31 am
Forum: Technical - Engines and Boilers
Topic: VFT tube leak
Replies: 54
Views: 1942

Re: VFT tube leak

Scaled boiler tube
by fredrosse
Sun Jan 05, 2020 5:29 am
Forum: Technical - Engines and Boilers
Topic: VFT tube leak
Replies: 54
Views: 1942

Re: VFT tube leak

Some figures to give actual numbers to the temperature profiles for typical conditions we find in launch or small locomotive boilers. These numbers are for my VFT 150 PSIG with 1-1/ 4 x 0.095 wall steel tubes, a boiler with 1/16 inch thick waterside scale, vs. a theoretical case with everything perf...
by fredrosse
Sun Jan 05, 2020 5:14 am
Forum: Technical - Engines and Boilers
Topic: VFT tube leak
Replies: 54
Views: 1942

Re: VFT tube leak

Being the Heat Transfer Specialist for a large corporation that designs steam power plants, I could not resist providing some detail here: “I wonder if they meant for both sides to be actual fluids or was it a generic term which includes gasses?” ANS: Liquids and gasses are both fluids, and both liq...
by fredrosse
Fri Jan 03, 2020 7:27 pm
Forum: Technical - non Engines and Boilers
Topic: Electrical system for boat
Replies: 35
Views: 3663

Re: Electrical system for boat

With the very low consumption associated with LED lights, it is very practical to just use ordinary battery power for running lights, as well as a LED searchlight. I had these on my boat, and the battery powered stuff can go for a full year with a couple of AA batteries. I now have kerosene running ...
by fredrosse
Wed Jan 01, 2020 2:45 am
Forum: Technical - Engines and Boilers
Topic: VFT tube leak
Replies: 54
Views: 1942

Re: VFT tube leak

From Lopez Mike: "I am often amazed at how little practical testing has been done in many engineering fields. I was chasing back some testing data on some radio antennas and found that the original tests has been done 90 years ago and nothing since. Every text book quoted the same data set! When I b...