Recent Blogs
Kipp Rotary-Piston Engine: Historical Layout and Power Calculator | FIRGELLI
Explore Hiscox’s rotating-cylinder Kipp engine arrangement and calculate cycle-average power from entered pressure, volume, speed and efficiency.
Joy’s Hydraulic Shifting Eccentric: Animation and Offset Calculator
See how opposing oil pistons shift an eccentric across its shaft. Compare lateral setting, eccentric throw and average shift speed in an illustrative geometric model.
Joy’s Valve Gear: Connected Animation and Valve-Travel Calculator
Follow Joy’s connecting-rod-driven valve gear through a complete crank cycle. Adjust guide inclination and compare piston position, valve displacement and valve travel.
Inverted Governor: Linkage Illustration and Speed-Bound Calculator | FIRGELLI
Explore an inverted-governor linkage and calculate square-root speed bounds for a declared speed-squared relationship. The outputs do not predict actual governor regulation.
Internally Fired Flue Boiler: Lancashire Cutaway and Thermal Calculator | FIRGELLI
Explore a schematic Lancashire boiler and calculate useful heat, equivalent evaporation, boiler horsepower and firing input from matching flow, enthalpy and efficiency.
Internal-Fired Tubular Boiler: Efficiency Comparison Calculator | FIRGELLI
Compare two entered efficiencies at equal input or equal useful output. This ratio calculator does not model boiler geometry, steam production or retrofit savings.
Independent Jet Condenser Pump: Volume Balance Calculator | FIRGELLI
Compare liquid and suction-state gas flow with theoretical piston displacement. Enter condensed mass, water ratio, gas flow, efficiency and stroke rate.
Inclined Paddle-Wheel Engine: Illustrative Geometry Calculator | FIRGELLI
Explore Hiscox’s inclined paddle-wheel engine and compare three assumed rise-and-run cases. Engine power, vessel performance and restoration limits are not calculated.
Huntoon Liquid-Resistance Governor and Speed Converter | FIRGELLI
Explore the Huntoon liquid-resistance governor and convert shaft speed to frequency, period and turns per hour. Response position is a separate illustration control.
Hotchkiss Boiler Cleaner: Settling Globe and Thickness Comparison | FIRGELLI
Learn about Hiscox’s circulating settling-globe cleaner and compare two scale thicknesses. Boiler heat loss, chemical treatment and cleaning performance are not calculated.
Horizontal Tubular Boiler: Surface-Area Scenario Calculator | FIRGELLI
Explore horizontal tubular boiler geometry. Calculate tube and assumed half-shell area, with a separate entered evaporation-rate scenario rather than a boiler capacity rating.
Horizontal Swing Check Valve: Liquid Cv and Velocity Calculator | FIRGELLI
Calculate a simplified liquid Cv requirement and nominal line velocity. Disc opening, risk, valve dynamics and equipment selection are not calculated.
Holly Rotary Engine: Paired-Piston Animation and Work Calculator
Explore Holly’s intermeshing rotary pistons, long cogs and mating recesses. Compare assumed pressure-volume work, mean torque and indicated power.
Tandem Compound Steam Engine: Area and Pressure Ratios | FIRGELLI
Compare piston areas and entered absolute-pressure ratios for a tandem compound concept. The calculator does not determine horsepower, stage work balance or operating limits.
Herreshoff Boiler: Historical Coil and Surface-Area Comparison | FIRGELLI
Read about the historical coil circuit and compare assumed surface area with cylindrical tube length. Pressure strength, heat transfer, steam quality and operating settings are...
Heintz Steam Trap: Thermal Principle and Scaling Exercise | FIRGELLI
Learn the Heintz two-metal thermal principle and explore a separate hypothetical flow-scaling equation. Values are not trap capacity or seat-sizing ratings.
Hazelton Boiler: Historical Layout and Heat-Balance Calculator | FIRGELLI
Learn the central-drum radial-tube arrangement and compare assumed heat-transfer quantities. The calculator is a general energy balance, not a boiler rating.
Harrison Boiler: Sectional Spheres and Geometry Calculator | FIRGELLI
Explore the Harrison sectional boiler and ideal sphere stress, pressure thrust, outer area and internal capacity. The calculator does not establish a boiler rating.
Hanging Water Drum Boiler: Hiscox’s Connected-Drum Design | FIRGELLI
Understand Hiscox’s cylindrical boiler with a lower water drum connected by necks. Historical explanation only; no pressure, expansion or operating rating is supplied.
Hancock Inspirator: Double-Tube Animation and Pressure Comparison
Follow the lifting and forcing steam jets of a Hancock inspirator. Compare selected delivery pressures with boiler pressure using adjustable ratios.
Hackworth Valve Gear: Linked Animation and Valve-Travel Calculator
Explore a single-eccentric Hackworth linkage with an inclined guide and an intermediate valve pickup. Calculate valve displacement, travel and clearance beyond lap.
Gridiron Slide Valve: Port Opening Calculator | FIRGELLI
Compare gridiron and single-port opening displacement. Calculate travel saved for equal-length ports, with a schematic animation and worked area example.
Gooch Valve Gear: Moving Link Animation and Valve-Travel Calculator
Follow the two eccentrics, suspended expansion link and lifted radius rod of Gooch valve gear. Explore valve travel with a connected geometric example.
Globe Valve: Liquid Cv Calculator and Flow Path | FIRGELLI
Calculate simplified liquid Cv demand, rated-capacity utilization, Cv margin and hydraulic power loss. Explore a globe valve’s plug-and-seat motion.
Galloway Boiler: Water Tubes and Heat Balance
See how tapered water tubes cross a Galloway boiler flue. Compare heating surface, absorbed heat, steam mass rate and thermal boiler horsepower.