Quick answer. Calculate installed material mass from area, thickness and verified density, divide it by the actual gun-on minutes available each day, then add 15–25% output reserve. A 2,000 m² polyurea floor at 2 mm can require about 7.6 kg/min after losses and reserve, while a 1,000 m² foam job at 50 mm may need only 3.3 kg/min; buying a 15 kg/min proportioner for both jobs adds power demand and capital without shortening preparation, masking or cure time.
The correct polyurea proportioner size is set by the material data sheet, daily production target, practical spray duty cycle, pressure, heat and A:B volume ratio. Maximum catalog output is a ceiling, not the number a crew sustains throughout an 8-hour shift.
This spray foam machine output calculator method converts the project into kg/min and pounds per minute, then matches that demand to a specific JYYJ pressure, drive and control platform.
Turn Project Area Into Required Material Mass
Start with the finished layer, not the machine brochure. For a coating, 1 m² covered at 1 mm equals 1 L of applied volume; multiply area in m² by dry thickness in mm and mixed-material density in kg/L.
Coating mass (kg) = area (m²) × thickness (mm) × mixed density (kg/L) × (1 + loss allowance). Confirm density and specified thickness on the material technical data sheet rather than using a generic polyurea value.
Example: 2,000 m² × 2.0 mm × 1.05 kg/L = 4,200 kg installed. An 8% allowance for overspray, hose fill, sample panels and surface geometry raises the planned supply to 4,536 kg.
Spray polyurethane foam uses applied foam density after expansion. The corresponding formula is foam mass (kg) = area (m²) × thickness (m) × applied density (kg/m³) × (1 + waste allowance).
For 1,000 m² at 50 mm and 35 kg/m³, the installed mass is 1,750 kg. A 12% allowance raises the order and production basis to 1,960 kg.
Do not substitute drum liquid density for applied foam density. ASTM D1622, the test method for apparent density of rigid cellular plastics, applies to spray foam materials and distinguishes core density from overall density with skins.
Loss assumptions should follow field records. A flat prepared floor may run near 5–8%, while corrugated decks, pipes, corners and windy exterior spraying can push planning allowances to 12–20%; record kilograms issued, kilograms returned and measured finished area on each project.
Spray Foam Machine Output Calculator: Five Inputs
The calculator needs five measured inputs: total planned material, production days, shift length, gun-on percentage and output reserve. “One 8-hour shift” does not mean 480 minutes of spraying.
- Calculate total material: use finished volume, verified density and a documented 5–20% loss factor.
- Set the daily target: divide total kilograms by the number of production days, excluding substrate preparation and cure windows.
- Estimate gun-on time: multiply shift minutes by the observed spray duty cycle. A 480-minute shift at 40% gun-on time provides 192 spray minutes.
- Find average gun output: divide daily kilograms by gun-on minutes.
- Add reserve: multiply average gun output by 1.15–1.25 for filters loading, temperature changes, hose losses and schedule recovery.
Required rated output (kg/min) = total planned kg ÷ production days ÷ gun-on minutes per day × reserve factor. Convert the result with lb/min = kg/min × 2.2046.
Suppose the daily target is 1,200 kg and job records show 210 gun-on minutes. Average demand is 5.71 kg/min, or 12.6 lb/min; with 20% reserve, select a machine that can deliver at least 6.86 kg/min, or 15.1 lb/min, under the specified material and hose conditions.
Duty cycle deserves more attention than nominal shift length. A crew may spend 90 minutes masking and warming material, 45 minutes moving hoses, 30 minutes changing drums, 45 minutes checking thickness and 60 minutes on breaks during a 480-minute shift, leaving 210–240 gun-on minutes.
Do not size around a 100% duty-cycle spreadsheet. If actual gun-on time is unknown, time three comparable shifts and use the lower recorded value; 35–50% is a more defensible planning band than an assumed 80–100% for mobile contracting work.
What a pounds-per-minute spray rig rating does not tell you
A 22 lb/min label equals roughly 10 kg/min, but that number does not confirm usable output through every mixing chamber, material viscosity or hose length. Ask for the tested output range, pressure at the proportioner, chamber used, material temperature and heated-hose length.
Pressure and heat remain separate sizing checks. JYYJ platforms cover 25–36 MPa, approximately 3,626–5,221 psi, while heating capacity ranges from 9.5 kW on an entry pneumatic unit to 26 kW on the highest-output hydraulic platform.
Worked Output Examples for Foam and Polyurea
| Project | Material calculation | Schedule assumption | Calculated output | Practical JYYJ class |
|---|---|---|---|---|
| Closed-cell foam insulation | 1,000 m² × 50 mm × 35 kg/m³ × 1.12 = 1,960 kg | 5 days × 150 gun-on min/day | 2.61 kg/min average; 3.27 kg/min with 25% reserve | 2–10 kg/min pneumatic, 25–30 MPa |
| Polyurea industrial floor | 2,000 m² × 2 mm × 1.05 kg/L × 1.08 = 4,536 kg | 3 days × 240 gun-on min/day | 6.30 kg/min average; 7.56 kg/min with 20% reserve | 2–10 or 2–12 kg/min hydraulic, 36 MPa |
| Large tank lining | 3,500 m² × 2.5 mm × 1.05 kg/L × 1.10 = 10,106 kg | 4 days × 240 gun-on min/day | 10.53 kg/min average; 12.63 kg/min with 20% reserve | 2–15 kg/min hydraulic, 36 MPa |
The foam example calls for only 7.2 lb/min after reserve. The JYYJ-3H spans 2–10 kg/min, or 4.4–22.0 lb/min, at up to 25 MPa and uses 9.5 kW of heating; it also requires 0.5–0.8 MPa air at 0.9 m³/min.
That selection leaves more than 6 kg/min of nominal output above the calculated requirement. Moving immediately to a 15 kg/min hydraulic platform would not reduce the five planned production days unless the crew could also increase gun-on time, access and substrate release rate.
The floor example needs 16.7 lb/min after reserve and a polyurea-capable hydraulic system. The JYYJ-H600 provides 2–12 kg/min at 36 MPa, uses a fixed 1:1 ratio, has 22/26 kW heating configurations and requires at least 0.5 m³/min of air at 0.5–0.8 MPa.
The tank project exceeds a 10 or 12 kg/min platform after the 20% reserve is applied. The JYYJ-H-V8T raises the range to 2–15 kg/min, or 4.4–33.1 lb/min, at 36 MPa with 32 kW total power, 26 kW heating and a 0–80°C control range.
If the tank schedule expands from 4 to 5 spray days, required rated output falls from 12.63 to 10.11 kg/min. That single-day scheduling decision may allow a 12 kg/min H600-class machine, so compare the cost of one site day with the capital, generator and electrical distribution required by a 32 kW platform.
Material, Ratio, Heat and Hose Can Override the Math
Output calculation gives a capacity floor; the material specification determines the machine architecture. Most standard polyurethane foam and pure polyurea systems specify a 1:1 A:B ratio by volume, but the supplier's current technical data sheet is the governing document.
A fixed 1:1 machine should never be purchased for a formulation requiring 1:1.5 or 1:2 by volume. The JYYJ-H600PK is the ratio-specific exception in this lineup: it adjusts from 1:1 to 1:2, delivers 2–10 kg/min at 36 MPa and uses a 7-inch PLC for recipe storage and data logging.
Ratio must be stated as volume or mass. Two components mixed 1:1 by volume can have unequal mass flow if their densities differ; purchasing from a mass-only calculation without checking the volume ratio can specify the wrong pump geometry.
Viscosity changes with temperature, so verify the supplier's A-side, B-side and hose setpoints. Typical project discussions may start near 35°C for foam and near 65°C for polyurea, but final settings must come from the material manufacturer and a controlled test spray.
At the top end, the H-V8T supplies 26 kW of heating across a 0–80°C range. Its 10-inch PLC and low-temperature interlock address cold-start repeatability; they do not authorize spraying outside the material supplier's temperature window.
Hose length adds pressure and heat loss. Pioneer packages normally include 15 m of heated hose; a hydraulic configuration may be engineered for substantially longer runs, but the quotation should state total length, hose diameter, heating zones and proven output at the gun.
Pressure selection follows atomization and material demand rather than area alone. JYYJ pneumatic models operate at 25–30 MPa, or about 3,626–4,351 psi, while hydraulic foam and polyurea models reach 36 MPa, about 5,221 psi.
The gun chamber can become the limiting orifice. Require an output test with the proposed chamber, 15 m or the quoted hose length, conditioned material and balanced A/B pressures; do not accept a free-flow pump number as installed gun production.
Higher calculated output also raises exposure-control demand. NIOSH guidance on MDI exposure during spray-on polyurethane and polyurea applications calls for engineering controls, protective clothing and respiratory protection, while NIOSH field guidance for spray-on liner operations warns that odor cannot be used to judge MDI exposure.
Choose the Smallest Platform With Verified Reserve
Shortlist machines whose tested operating range contains the calculated setpoint, rather than selecting solely by maximum output. A required 7.6 kg/min point fits a 2–10 kg/min or 2–12 kg/min hydraulic platform; a 12.6 kg/min point requires the 2–15 kg/min class unless the schedule changes.
| JYYJ platform | Rated output | Pressure | Equipment constraint | Best calculated demand |
|---|---|---|---|---|
| JYYJ-3H | 2–10 kg/min; 4.4–22.0 lb/min | 25 MPa; 3,626 psi | Fixed 1:1, PU foam, 9.5 kW heat, 0.9 m³/min air | About 2.5–7.5 kg/min foam demand |
| JYYJ-H600 | 2–12 kg/min; 4.4–26.5 lb/min | 36 MPa; 5,221 psi | Fixed 1:1, hydraulic, PU foam and polyurea | About 4–9.5 kg/min industrial demand |
| JYYJ-H600PK | 2–10 kg/min; 4.4–22.0 lb/min | 36 MPa; 5,221 psi | Adjustable 1:1–1:2, 7-inch PLC | Ratio-driven work up to about 8 kg/min |
| JYYJ-H-V8T | 2–15 kg/min; 4.4–33.1 lb/min | 36 MPa; 5,221 psi | Fixed 1:1, 32 kW total, 26 kW heat, 10-inch PLC | About 9–12.5 kg/min calculated demand |
The demand bands above preserve roughly 15–25% operating reserve and are selection guides, not new machine ratings. Final approval requires the exact material, chamber, voltage, hose length, ambient range and production schedule.
Pioneer turnkey packages run from $3,250 to $11,200 and include the proportioner, one Fusion-compatible gun, two transfer pumps, 15 m heated hose, tool kit and IPPC export case. In-stock units can be prepared within 7 days; custom voltage or configuration requires a confirmed production date.
Compare that complete package basis against a Graco or PMC quotation line by line. Add the gun, two feed pumps, heated hose, transformer or generator, compressor, freight, commissioning spares and local service charges before calculating the acquisition difference.
A higher-output proportioner can force a larger electrical package. For example, the 32 kW H-V8T should be sized with starting load, heater duty, compressor and site auxiliaries included; a generator selected at exactly 32 kW leaves no allowance for simultaneous loads or startup behavior.
Use a procurement sheet with 10 fields: material name, A:B ratio, density, viscosity at specified temperature, area, thickness, daily kilograms, gun-on minutes, hose length and site voltage/phase/frequency. Without those values, a “largest machine” recommendation is sales shorthand rather than engineering selection.
FAQ
Q: How many pounds per minute should my spray rig produce?
Divide planned daily pounds by actual gun-on minutes, then add 15–25%. A target of 2,650 lb/day over 210 gun-on minutes equals 12.6 lb/min; with 20% reserve, specify at least 15.1 lb/min, or 6.86 kg/min.
Q: Can I calculate machine size from square feet alone?
No. At 10,000 ft², changing thickness from 1 inch to 2 inches doubles finished volume; changing foam density from 2.0 to 2.5 lb/ft³ adds another 25%. Area, thickness, density and loss percentage must all be entered.
Q: Is a 15 kg/min proportioner always faster than a 10 kg/min unit?
No. If a project requires 6 kg/min and delivers only 210 gun-on minutes per shift, both machines can meet the same daily target. Masking, drum changes, lift thickness, access and inspection may control the schedule.
Q: What polyurea proportioner size fits a 2,000 m² floor?
At 2 mm, 1.05 kg/L and 8% loss, the job needs about 4,536 kg. Finished in 3 days with 240 gun-on minutes daily, it requires 6.30 kg/min average or 7.56 kg/min with 20% reserve, pointing to a 36 MPa hydraulic machine in the 2–10 or 2–12 kg/min class.
Q: Should ratio be entered by weight or volume?
Use the basis printed on the material data sheet. Standard JYYJ fixed-ratio machines meter 1:1 by volume; formulations from 1:1 to 1:2 by volume require the adjustable-ratio H600PK or another pump set engineered for that ratio.
Q: How much output reserve should I buy?
Use 15% for controlled indoor production with short hose runs and measured duty-cycle records; use 20–25% for mobile sites, long hoses, cold starts or schedule recovery. Reserve above 25% should be justified by a documented second shift, future contract or tested material condition.