[Traindude]

Currently, OR automatically assumes that all steam locomotives have one live steam injector and one exhaust steam injector. While this is OK, it isn't accurate to all locomotives.

For example, most large steam locomotives in the US had a live steam injector (used while standing) and a feedwater heater system (used while moving), while most smaller locomotives had only two live injectors.

I propose that we find a system to specify the kind of boiler water-feeding devices a locomotive has, similar to how brake equipment is specified. While water systems vary from country to country, and the specifications between makes may vary, specifying water systems can be defined using simple generic terms, which can be fine tuned through the physics parameters.

Here is an example for a large locomotive with a non-lifting live steam injector and a Worthington Model SA feedwater heater system:

comment ( Worthington SA Feedwater Heater System )
ORTSSteamWaterSystem1EquipmentType ( "Automatically_Regulated_Centrifugal_Cold_Water_Pump, Open_Type_Feedwater_Heater, Reciprocating_Hot_Water_Pump" )
ORTSSteamWaterSystem1Operation ( 1 )
comment ( 0 = Standing and Moving, 1 = Moving Only, 2 = Standing Only )
...
(...water system 1 physics and parameters go here...)
...

comment ( Non-Lifting Live Steam Injector )
ORTSSteamWaterSystem2EquipmentType ( "Nonlifting_Live_Steam_Injector" )
ORTSSteamWaterSystem2Operation ( 0 )
comment ( 0 = Standing and Moving, 1 = Moving Only, 2 = Standing Only )
...
(...water system 2 physics and parameters go here...)
...

Notice how in the Worthington example, the equipment is listed in order from tender to boiler.

Here is an example of a smaller locomotive with two lifting live steam injectors:

comment ( Lifting Live Steam Injector )
ORTSSteamWaterSystem1EquipmentType ( "Lifting_Live_Steam_Injector" )
ORTSSteamWaterSystem1Operation ( 0 )
comment ( 0 = Standing and Moving, 1 = Moving Only, 2 = Standing Only )
...
(...water system 1 physics and parameters go here...)
...

comment ( Lifting Live Steam Injector )
ORTSSteamWaterSystem2EquipmentType ( "Lifting_Live_Steam_Injector" )
ORTSSteamWaterSystem2Operation ( 0 )
comment ( 0 = Standing and Moving, 1 = Moving Only, 2 = Standing Only )
...
(...water system 2 physics and parameters go here...)
...

The Union Pacific Challengers and Big Boys used a centrifugal water pump in series with an exhaust steam injector. Here's how that would look:

comment ( Elesco TP Exhaust Steam Injector System )
ORTSSteamWaterSystem1EquipmentType ( "Centrifugal_Cold_Water_Pump, Nonlifting_Exhaust_Steam_Injector" )
ORTSSteamWaterSystem1Operation ( 1 )
comment ( 0 = Standing and Moving, 1 = Moving Only, 2 = Standing Only )
...
(...water system 1 physics and parameters go here...)
...

comment ( Non-Lifting Inspirator )
ORTSSteamWaterSystem2EquipmentType ( "Nonlifting_Inspirator" )
ORTSSteamWaterSystem2Operation ( 0 )
comment ( 0 = Standing and Moving, 1 = Moving Only, 2 = Standing Only )
...
(...water system 2 physics and parameters go here...)
...

Here's a list of possible water system equipment tokens:
Lifting_Live_Steam_Injector
Nonlifting_Live_Steam_Injector
Lifting_Inspirator
Nonlifting_Inspirator
Nonlifting_Exhaust_Steam_Injector
Centrifugal_Cold_Water_Pump
Automatically_Regulated_Centrifugal_Cold_Water_Pump (**a la Worthington SA, automatically shuts off when heater "tank" is full**)
Reciprocating_Cold_Water_Pump (**a la Elesco, Worthington BL**)
Duplex_Reciprocating_Cold_Water_Pump (**a la Elesco**)
Centrifugal_Hot_Water_Pump (**a la Wilson Water Conditioner on some MILW 4-6-4's**)
Reciprocating_Hot_Water_Pump
Closed_Type_Feedwater_Heater (**a la Elesco and Coffin**)
Condensate_Drain_To_Tender (**used with closed heaters, any exhaust steam that condenses back into water is recirculated back into the tender**)
Open_Type_Feedwater_Heater (**a la Worthington**)
Crosshead_Pump (**a la 19th century**)
(more to be added later)

For more information about various types of boiler feeding devices, consult this ICS textbook from 1937.
Alternate Links:
http://www.icsarchiv...e_injectors.pdf
http://www.icsarchiv..._equipments.pdf
https://babel.hathit...iew=1up&seq=622 (Pages 622-637)

Trello Card for Voting:
https://trello.com/c/8RpY33fi

[Weter]

Always had interest, what are "live" and "exhaust" mean applying to injectors?
I think, it has sence, as far as there were such many different-functioning variants of feed water pumping.

[Traindude]

Weter, on 06 December 2020 - 06:07 PM, said:

Always had interest, what are "live" and "exhaust" mean applying to injectors?
I think, it has sence, as far as there were such many different-functioning variants of feed water pumping.

"Live" and "exhaust" refer to the steam that is used to operate the injectors. A live steam injector uses steam taken directly from the boiler, while an exhaust steam injector uses exhaust from the cylinders. I believe if you look at my ICS textbook link there is an example of how an Elesco exhaust steam injector works.

[darwins]

It would be of interest to add provided a suitable default model could be defined for each type.

[Traindude]

darwins, on 06 December 2020 - 10:19 PM, said:

It would be of interest to add provided a suitable default model could be defined for each type.

So IOW, for each token ("Lifting_Live_Steam_Injector", "Centrifugal_Cold_water_Pump", "Open_Type_Feedwater_Heater", etc.) specified in the each of the two water systems, it would cause OR to load a generic model for each token. Is that correct?

[Weter]

Thank you for answer.
I thought, the both used steam from the boiler, but use exhaust is more rational as it waste no additional steam (yes, the logic of naming tips the same, as you have explained for me here) so is the exhaust usable only if regulator is open and locomotive is moving?

[darwins]

Weter, on 07 December 2020 - 12:08 PM, said:

so is the exhaust usable only if regulator is open and locomotive is moving?

Yes that is correct.

[Traindude]

For those who are interested, I have added a Trello Card for this subject.