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Yes, if there is less back pressure on the HP --> less pressure to drive the IP and then even less pressure to drive the LP.

See https://www.amazon.com/Slide-valves-valve-gearing-Youngson/dp/B0008D03L0/ref=sr_1_5?dchild=1&qid=1603923668&refinements=p_27%3APeter+Youngson&s=books&sr=1-5&text=Peter+Youngson Price is interesting. There is a download available somewhere...

Textbook you need is Youngson, which is a definitive work on marine compounds and triples. I will search for link. There are many compounds and triples still running in Europe, US, UK and Europe, but progressively fewer engineers who understand exactly the mathematics of steam distribution and...

Marine steam engineers avoid the term "simpling valve" as it doesn't make the engine a simple, rather the term "impulse valve" is favoured. The impulse starting valve does not give the engine more power, just used to kick over the IP or LP if the HP is stuck on a centre. Most engineers will...

Was advised many years ago as last resort for warped block was to use the sludge at the bottom of an old tin of Silverfrost that had Sat on shelf for a long time. Must not mix in the thinner liquid on top. Also let surfaces together without sliding.

I teach full sized marine steam students that the vacuum is created by the condenser as steam contracts back to water. This vacuum is harmed by air that leaks in and occupies a huge volume. On small plants the single air pump must primarily remove this air, but it also is tasked with removing...

Perhaps first find some drawings for an oscillating compressed air engine. Steel cylinder, standard, crank and base with 12 mm / 1/2" brass piston and connecting rod. Teaches basic lathe, drill and bench work. Many have been made by my students in high school. They don't take too much time to...

Part retired and now technology teaching 2dpw online from home as I was in higher age risk group and advised to stay away. Only a handful of students coming to school, probably children of essentials. Able to do more home workshop stuff - Taking more time and pursuing more quality. Supply of...

Softening carbon steel depends on speed of cooling through S curves (because they are "S" shaped). Copper does not have S curves so quenching is convenient but not necessary. Work hardening of say copper steam pipes required delagging every 5 odd years and a quick anneal to remove effects of...

You can take indicator cards on larger engines, and those with slide valves will show imperfect diagrams. The process of balancing power distribution between HP, IP and LP is complex and counter-intuitive. Read Youngson (best) for the detail. If it is that difficult with full size triples...

There is a lot to consider and was often a lifetime study... Yes the air pump (or extraction pump if a closed feed system) is functional only for steam plants as it pumps air and condensate from the condenser. Air will leak in from any leaky gland in the entire plant that is exposed to exhaust...

Interesting - Did the pattern + casting + machining for a full size 5" bore Frisco some years ago. Fascinating to see how the designer managed to get the cooling water into around the recesses in the head. Also installed hardened seats into the cast iron head to allow for non-leaded fuel. Engine...

See http://www.diagnosticengineers.org/journal_%20articles/Ring%20Gaps%20vs%20Knowledge%20Gaps.php but no direct ref to the actual experiment report for citation.

There was a test which used a new 4 cylinder engine - New rings, but they ran the engine and progressively opened up the ring gaps by increments until well over recommended gap limits. Results showed no real loss of compression until ring gap was huge. Conclusion was that ring gap made less...

Many people think they started with the High Pressure and added the IP and LP, but historically they started with LP atmospheric engines where the vacuum did most of the work and added higher pressure cylinders fed by higher pressure boilers. The reluctance to embrace high pressure steam was a...

Also http://www.steamlaunch.com/engines/york.html

also see KB Harris work at https://www.maidstone-engineering.com/other/self-build-92/drawing-sets/henry-greenly-archive-drawings-traction-stationary-engines/henry-greenly-archive-high-pressure-single-cylinder-launch-engine

School metal shops teachers will growl at students for parking keys in chucks. Students and apprentices are taught never to do this and that the chuck key must always be held, or rested in the chip tray. There have been many case examples of broken or injured hands, etc. plus broken windows...

Inescapable part of pressure vessel engineering is staying of flat surfaces to resist bulging - For a 3" drum perhaps 3 x 1/4" copper rods spaced equally and SS onto end plates. Your compressor air vessel avoids this issue with install of dished ends (loads are tension not bending). Stays are...

On water finish - I neglected to detail that the oil stone rubs between tool and job, but the gap between tool and job is adjusted so that oil stone leans in at top, and therefore produces on the tool a tiny flat that is 'wider' than the feed rate per turn. A tiny facet on the end relief angle...