Recent Blogs
Dumping-section Furnace Grate: Fuel-input Calculator | FIRGELLI
Compare rectangular grate area, equal panel area and fuel-energy input per square meter. Understand why these values do not predict dumping intervals or boiler limits.
Franchot Rotary Engine: Sliding-Wing Mechanism and Animation
Explore the Franchot sliding-wing rotary engine: a slotted rotor, a rigid sliding wing and an ovoid casing, with an animation and piston-power comparison.
Foster Pressure-Reducing Valve: 1888 Diaphragm Design
Explore John M. Foster’s 1888 diaphragm regulator. See the spring and valve move together and calculate pressure acting on a circular seat area.
Forrester Rotary Engine: Historical Mechanism and Ideal Torque | FIRGELLI
Explore Hiscox’s Forrester rotary-engine arrangement and a separate ideal pressure-force, lever-arm torque and power comparison.
Fly-wheel or Pulley Governor: Force and Spring Calculator | FIRGELLI
Learn how a shaft governor adjusts valve gear. Compare centrifugal force and an ideal direct spring displacement without claiming engine regulation or tuning.
Flexible Metallic Hose: Bore-Area Thrust Comparison | FIRGELLI
Compare pressure times bore area and ideal braid-angle loads. Learn why actual ratings, layer sharing and movement layouts require hose manufacturer data.
Fletcher’s Condensing Engine: Pressure-Reference Calculator | FIRGELLI
Explore Fletcher’s eccentric-drum rotary engine and sliding wings. Compare absolute inlet and condenser pressures with local atmosphere and convert psi to kPa.
Flanged Expansion Joint: Free Thermal Expansion Calculator | FIRGELLI
See a flanged sliding expansion joint in section. Calculate free pipe length change from length, mean expansion coefficient and temperature change.
Boiler Feedwater Filter: Upward-Flow Animation and Pressure-Loss Calculator
Explore a historical upward-flow feedwater filter and compare ideal pressure loss using an entered coefficient, density, velocity and resistance multiplier.
Feeding Pulverized Fuel: Interactive Process Diagram | FIRGELLI
Follow grinding, classification, coarse return and primary-air transport. Compare entered velocity, air/fuel ratio, fineness and moisture alongside the animation.
Feed-Water Heater: Heat and Steam-Ratio Calculator | FIRGELLI
Compare ideal heat input, condensing-steam mass ratio and terminal temperature difference for a closed feed-water heater. Includes an animated tube cross-section.
Exhaust Steam Head: Baffle and Passage-Area Calculator | FIRGELLI
Explore the baffle, vent and drain in an exhaust steam head. Compare ideal inlet, outlet and annular passage areas without assuming a pressure-loss rating.
Exhaust Jet Condenser: Injection-Water Calculator | FIRGELLI
Calculate an ideal jet-condenser water balance from steam flow, enthalpy and water temperatures. Explore mixed discharge and saturation-pressure reference.
Excelsior Injector: Steam and Water Pressure Calculator | FIRGELLI
Follow an Excelsior injector valve sequence and compare static suction pressure, water vapour pressure and a specified delivery-pressure target.
Ejector Condenser Mechanism: How It Works, Parts, Diagram, and Uses Explained
Explore a multi-jet condenser cutaway and compare cooling-water flow, equivalent nozzle bore and mixed discharge under an assumed complete-condensation condition.
Edwards Air Pump Mechanism: How It Works, Parts, Diagram and Sizing Formula for Steam Condensers
See the Edwards pump’s solid conical bucket, inlet ports and head valves. Estimate bore-swept volume and compare factor-adjusted flow with demand.
Eclipse Return Tubular Marine Boiler Mechanism: How It Works, Parts, Diagram & Evaporation Formula
Trace the Eclipse boiler’s direct and return gas passes. Calculate steam mass flow and heat output from measured heating surface, evaporation and enthalpy rise.
Eccentric-rod Disengaging Device Explained: How It Works, Parts, Diagram & Uses in Steam Valve Gear
Explore Brown 186 manual eccentric-rod release with a moving hand lever, an illustrative lifting cam and a calculator for gab lift and valve-pin clearance.
Dow Steam Turbine Mechanism: How It Works, Parts, Diagram, Formula and Uses Explained
Explore the Dow turbine’s fixed and rotating grooved disks. Enter diameter, shaft speed and inspection radius to calculate surface speed and acceleration.
Double-Slide Piston Rotary Engine: Radial Slides and Ovoid Chambers
Explore two opposed radial slides in an ovoid rotary-engine casing. Calculate slide travel, guide engagement and static chamber volume for a selected ellipse.
Disengaging Device (modification 3) Mechanism Explained: Parts, Diagram, and How It Works
Explore a hand lever and link lifting an eccentric rod off its valve pin. Compare gab clearance, handle travel and ideal effort against an assumed...
Manual Eccentric-Rod Disengaging Device: Brown188 Gab Release
Explore Brown 188 manual gab release with its hand pivot behind the valve pin. Compare lift, notch clearance and handle travel using an illustrative circular...
Manual Eccentric-Rod Disengaging Device: Brown187 Gab Release
Explore a manual eccentric-rod gab release. Compare hand rotation, cam lift and pin clearance using an illustrative circular cam with the engine connection at rest.
Direct-acting Centrifugal Governor: How It Works, Parts, Formula & Uses Explained
Explore radially sliding governor weights, steel ribbons and a spring-loaded collar. Compare ideal collar lift at three speeds for the stated example geometry.
Dion Vehicle Boiler: Concentric Drums, Water Tubes and Grate-Area Comparison
Explore the Dion boiler’s concentric drums and inclined water tubes. Compare grate area for a steam demand using two measured grate-area evaporation rates.