Search found 119 matches

by daves1459
Thu May 23, 2019 10:18 pm
Forum: Live Steam
Topic: Super heated Steam Throttle Lag
Replies: 28
Views: 2434

Re: Super heated Steam Throttle Lag

Why is ptfe a concern? The only place I can see where it would be used would be if a ball valve is used for the throttle valve. Why not use an all-metal gate valve if the throttle is in the smokebox? I’ve seen such ball valves get cooked in the smokebox, even without superheaters. The concern is no...
by daves1459
Wed May 22, 2019 9:58 pm
Forum: Live Steam
Topic: Super heated Steam Throttle Lag
Replies: 28
Views: 2434

Re: Super heated Steam Throttle Lag

I have enjoyed following this thread, I just got my Heavy Mikado fired up a few months ago, it has a superheater. I am in the process of decreasing the amount of superheat because I am destroying throttle valves. Originally my superheater elements ran all the way to the back of the firebox, I am go...
by daves1459
Tue May 21, 2019 10:20 pm
Forum: Live Steam
Topic: Super heated Steam Throttle Lag
Replies: 28
Views: 2434

Re: Super heated Steam Throttle Lag

Steam from the dome throttle enters the center tube of the SH at the smokebox and goes to the firebox tee fitting. Then around the other 2 legs of the SH and back through the flues to the smokebox and to each cylinder. The pipe unions come up to a tee and are the exhaust blast. for some reason i ca...
by daves1459
Tue May 21, 2019 10:15 pm
Forum: Live Steam
Topic: Super heated Steam Throttle Lag
Replies: 28
Views: 2434

Re: Super heated Steam Throttle Lag

Dave, Looks excellent, well done! I'm using this method of welding the SH return ends, too some 40 years now with best results :) But I don't recommend enlargeing the back ends into the firebox due to the risk of overheating! Please think about of firing by means of the blower at standstill. One ca...
by daves1459
Tue May 21, 2019 9:48 pm
Forum: Live Steam
Topic: Super heated Steam Throttle Lag
Replies: 28
Views: 2434

Re: Super heated Steam Throttle Lag

Just an idea but would it be possible for the dry pipe to run directly from the steam dome to the back of the firebox as per Fred's pic then have a few back and forth loops across the top of the firebox, then two pipes, again per Fred's pic back to the smokebox, then combine at the throttle valve, ...
by daves1459
Tue May 21, 2019 9:40 pm
Forum: Live Steam
Topic: Super heated Steam Throttle Lag
Replies: 28
Views: 2434

Re: Super heated Steam Throttle Lag

Looks great! The return bends are the only part of my boiler that I did not make myself. I had a professional welder do that for me. To keep the inside of the return bend free from weld, I think he flooded the tube with an inert gas, maybe nitrogen, I'm not sure though. My fire box is pretty short ...
by daves1459
Wed May 15, 2019 8:42 pm
Forum: Live Steam
Topic: Super heated Steam Throttle Lag
Replies: 28
Views: 2434

Re: Super heated Steam Throttle Lag

With the process development out of the way I proceeded to make the five elements needed for my loco. At present each element will be 29" long depending upon how far they protrude into the fire box area. The photo looking straight down into the fire box shows my thought on how far that protrusion sh...
by daves1459
Wed May 15, 2019 8:22 pm
Forum: Live Steam
Topic: Super heated Steam Throttle Lag
Replies: 28
Views: 2434

Re: Super heated Steam Throttle Lag

I'm proceeding with the installation of a super heater. My dry pipe connection in the smoke box allows me to remove the super heater and convert to saturated steam with out a horrible amount of work in the event the super heater becomes a problem. A question: Since one of the main efficiency improve...
by daves1459
Wed May 08, 2019 8:27 pm
Forum: Live Steam
Topic: Super heated Steam Throttle Lag
Replies: 28
Views: 2434

Super heated Steam Throttle Lag

I'm installing a hair pin type super heater in my current project. It is a 7 1/2" gauge NYC 999 with a 8" barrel diameter wagon top copper boiler with steam dome throttle and is propane fired. There are five elements of .500" O.D. X .410" I.D. 304 stainless tube about 30" long. I was discussing the ...
by daves1459
Tue Mar 05, 2019 10:55 pm
Forum: Live Steam
Topic: 3/16-32 Tri Cocks?
Replies: 17
Views: 1884

Re: 3/16-32 Tri Cocks?

I've enjoyed reading your "conversation". I've always had trouble with tapered plug cocks seizing up. I've had them in injector water lines, sight glass drains, and boiler water try cocks. Last year I experimented with plumbers silicon grease. It is supposed to be good up to 500F and not wash out. I...
by daves1459
Sat Feb 16, 2019 11:21 pm
Forum: Live Steam
Topic: Hydrostatic Lubricator Drawings
Replies: 4
Views: 1159

Re: Hydrostatic Lubricator Drawings

When that article came out, I was interested in making a version for m 3-cyl Schools Class engine. I didn't have drawings but I looked at the article and figured out the function of all the parts and rough dimension, then made my own lubricator which had 3-pots rather than the Detroit's 4 pots. It ...
by daves1459
Thu Feb 14, 2019 8:53 pm
Forum: Live Steam
Topic: Hydrostatic Lubricator Drawings
Replies: 4
Views: 1159

Hydrostatic Lubricator Drawings

This as a real L-O-N-G shot: Does anyone out there have a set of drawings I could get copies of for the 1.5" scale Detroit Lubricator described by Basil Palmer in the October 1991 issue of Model Engineer magazine. Mr. Palmer offered free drawings of his hydrostatic lubricator design to anyone upon r...