Recent Blogs
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.
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.
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.
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.
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.
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.