Graco H-XP3 Two-Component Polyurea Spray Machine Complete Operation Manual: Usage Methods and Precautions

The Graco H-XP3 is a high-performance, hydraulically driven, two-component sprayer designed specifically for polyurea elastomers and polyurethane foam materials. Maximum fluid working pressure is 24.1MPa (3500psi), maximum total output (A+B) is 5.7L/min (1.5 gallons/min), hydraulic ratio is 2.79:1, and the default ratio is 1:1. The equipment is only suitable for professional industrial construction and is strictly prohibited from being used in explosive environments or under non-professional personnel. Below is the complete operation manual and precautions for the Graco H-XP3 two-component polyurea sprayer:

1. Comprehensive preparation before construction

1.1 Environment and substrate preparation

Construction environment temperature ≥3°C, substrate surface temperature more than 3°C above dew point, relative humidity < 85% Outdoor work wind speed ≤5m/s; forced ventilation in rainy, snowy, or foggy weather is strictly prohibited; explosion-proof exhaust fans are installed; Remove all fire sources, set up no-smoking signs, and equip dry powder / carbon dioxide extinguisher base treatment: metal sandblasting to SA2.5 grade, must be sprayed within 2 hours after sandblasting; Concrete grinding removes slurry and repairs porosity and cracks; All non-sprayed areas are tightly covered with tape + plastic film. Ruida Zhitu reminds you: The quality of substrate treatment directly determines the adhesion and service life of Ruida Zhitu polyurea coatings.

1.2 Equipment inspection and lubrication

Every day at the start of work, it is a must to be done. Check the hydraulic oil tank and heating circulation oil level; if below the mark, promptly replenish the corresponding model of special oil; Inject Graco's dedicated tube sealant (TSL) into the ISO pump wet cup to the specified level; Check all hoses, fittings, and sealing rings for aging, cracks, or looseness; Check whether the emergency stop button, pressure gauge, and temperature sensor are sensitive and normal.

1.3 Preparation of Materials and Air Source

Ruida Smart Coating Polyurea Coating A: The material barrel must be sealed at all times and preheated with the matching heating sleeve; Inserting dry air pipes or continuously introducing dry nitrogen creates positive pressure to isolate moisture. Mix B mixture evenly until there is no sediment at the bottom, then place it in a heating sleeve to preheat. Compressed air must undergo three-stage drying + filtration, with a dew point of ≤-40°C, and must not contain oil or water. Prepare specialized cleaning agents, DOP sealing liquid, backup mixing chambers, and nozzles in advance. Ruida Smart Coating reminds you: Mixing different brands of polyurea coatings is strictly prohibited to prevent chemical reactions.

1.4 Personal protective equipment

Full-face respirators with inflatable masks must be worn; using only the cartridge is strictly prohibited. Wear a chemical-resistant one-piece protective suit, chemical-resistant apron, and high-top chemical-resistant boots. Wear thickened nitrile chemical protective gloves and change them every 2 hours. It is also equipped with impact-resistant goggles, soundproof earplugs, and a protective face shield. Ruida Zhitu reminds you: Ruida Zhitu polyurea coating contains active chemicals before curing, so strict personal protection must be taken.

2. Equipment installation and preheating commissioning

2.1 System Connection

The main unit is placed horizontally and fixed, reliably grounded, with a grounding resistance of ≤4Ω. Insert pumps A and B into the corresponding Ruida Zhi Coating polyurea coating barrels to ensure the pump body is fully immersed in the liquid solution. Connecting the heating hose and electrical quick connectors between the main unit and the spray gun, all high-pressure joints are tightened with a torque wrench to the specified torque. Connect the dried compressed air and adjust the air source pressure to 0.6-0.8MPa.

2.2 Parameter Settings

After connecting the power, the heating system must be turned on immediately; starting the cold material is prohibited.

Ruida Smart Coating of Aromatic Polyurea: Material A 70-80°C, Material B 70-80°C, heating hose temperature 5-10°C higher than material temperature. Ruida Intelligent Coating Aliphatic Polyurea: Material A 60-70°C, Material B 60-70°C, heating hose temperature 5-10°C higher, main pump pressure 18-25MPa, fine-tuned according to Ruida Intelligent Polyurea coating viscosity; Cleaning pump pressure of 3-5MPa ensures a pressure deviation of 0.5MPa between sides A and B ≤± 0.5MPa

2.3 System Preheating and Cycling

Start the heating system, and after materials A, B, and the hose reach the set temperature, keep them warm for 15-20 minutes. Switch to circulation mode to allow Ruida Zhitu Polyurea coating to circulate between the main unit and the barrel for 10 minutes, ensuring uniform temperature. Check the inlet pressure gauge; a stable pressure of 0.6-1.0MPa is normal; If there is any fluctuation, check if the filter is clogged.

3. Key verification steps before spraying

3.1 Thorough debubbing

Bubbles can cause pinholes, bulging, and poor curing of the coating, which is the most critical factor determining the success or failure of the application.

Maintain circulation mode, do not install a spray gun, and let Ruida Zhitu Polyurea Coating circulate high-flow for 5 minutes. Connect transparent plastic pipes at pump outlets A and B respectively, allowing material to freely flow into the waste bucket until the outflow material is continuously free of obvious bubbles. Resume high-pressure circulation, then slowly loosen the pump outlet connector by a quarter turn, discharge any residual microbubbles from the pipeline, and until the outflow material is clear, continuous, and free of any foam, then tighten the joint

3.2 Static spray inspection

Absolutely cannot be omitted. Remove the spray gun nozzle and aim the muzzle at the waste bin. Pull the trigger and continue spraying for 3-5 seconds, observing the material spraying status on both sides.

Qualification criteria: Materials A and B are injected simultaneously, pressure is balanced, material flow is continuous and stable, and there is no "burping," deviation, or bubble formation. Non-compliant Handling: Immediately stop and re-perform the foaming step, check whether the pressure is balanced, until spraying is qualified. It is strictly forbidden to install nozzles for spraying without passing the spraying standard, otherwise it may cause uneven mixing of Ruida Zhiyue polyurea coating, coating failure, or even equipment damage

3.3 Test Spray Calibration

Install the specified nozzle model and test spray Ruida Zhi Polyurea coating on the scrap sample. Check the sprayed fan surface width of 15-25cm, atomization effect, and coating appearance. Use a wet film thickness gauge to check the thickness of a single pass, adjust the spray gun movement speed, and ensure a thickness of 300-500μm per pass. Ruida Smart Coating reminds you: Before formal application, you must make a sample and confirm that the color and performance meet the requirements before applying a large area.

4. Formal spraying operations

4.1 Standard Spraying Techniques

Keep the spray gun perpendicular to the substrate surface, keeping the distance between 50-60cm. Move the spray gun at a constant speed of 0.3-0.5m/s, avoiding sudden changes in speed or slowness. The spraying trajectory is parallel and straight, with adjacent tracks overlapping by 50%, completely eliminating missed spraying. The coating is cross-sprayed in 2-3 layers, with total thickness meeting design requirements: Ruida Zhi Coating roof waterproof polyurea ≥ 1.5mm, Ruida Zhi Coating anti-corrosion polyurea ≥ 2.0 mm. Spraying interval: 1-2 hours at 25°C, 2-4 hours below 15°C, based on non-stickiness to the touch.

4.2 Strengthen treatment of special areas

At internal and external corners, corners, pipe roots, and expansion joints, first apply a Ruida Smart Coating polyurea pre-spray reinforcement layer with a thickness of ≥1mm. The lap joint width should be ≥10cm; the overlap between new and old coatings should be roughened before spraying. After spraying, use specialized tools to trim edges and seams before the coating surface dries.

4.3 Precautions during the spraying process

Try to keep the trigger continuously open, reduce the number of switches, and extend the life of the mixing chamber and seals. The gun stop time must not exceed the gel time for Ruida Smart Polyurea Coating, usually 5-15 seconds; otherwise, materials in the mixed chamber will instantly cure and be scrapped. Constantly monitor pressure gauges and temperature gauges, and stop the machine immediately for inspection if any abnormalities are found. Ruida Zhitu reminds you: During construction, samples should be taken every 2 hours for future reference.

5. Standardize shutdown and system cleanup

5.1 Temporary shutdown

Downtime ≤ 1 hour. Pull the trigger to release system pressure and lock the spray gun trigger lock. Keep the heating system running to maintain the temperature of Ruida Smart Coating Polyurea coating. Immerse the spray gun nozzle in a special solvent to prevent clogging.

5.2 Same-day completion and cleaning

Cleaning methods for pipelines A and B are strictly distinguished.

Pressure relief: Lock the spray gun trigger, open the pressure relief valves of components A and B in sequence, and wait for all pressure gauge readings to drop to zero. Material B pipeline cleaning: If the B material barrel is empty, insert the B material suction tube into the clean water bucket and rinse with high-pressure water flow in circulation mode for 5 minutes until the clean water flows out. Whether or not the B material bucket is used up, the final wash must be cycled with a dedicated solvent for 10 minutes until the solvent is clear. A material pipeline treatment: water cleaning is absolutely contraindicated. Close the valve at the bottom of the A material bucket, loosen the inlet connector of the A pump, and release any residual Ruida Zhiyue polyurea material. Clean the A-pump wet cup and inlet filter with a special solvent, dry it, and apply a small amount of special grease. Insert the A pump suction tube into the protective bucket containing DOP, circulate briefly, then seal the spray gun and cleaning the mixing chamber: immediately remove the mixing chamber and nozzles, then use a high-pressure water gun and copper brush to thoroughly remove any residual Ruida Smart Polyurea material. Do not use screwdrivers, steel needles, or other sharp metals to poke hard to avoid damaging the precision mating surfaces. Power off sealing: Turn off the heating system and main power supply. Turn off the air compressor and drain the condensate. Tightly seal the A and B buckets of Ruida Zhitu Polyurea coating, fill with nitrogen, and seal for storage

5.3 Long-term shutdown

Downtime ≥ 3 days. Thoroughly clean all pipelines according to the day's completion procedures. Disassemble the lifting pump, spray gun, and mixing chamber; clean all components thoroughly with solvents, apply rust-preventive oil, and assemble. Drain hydraulic oil and heating circulation oil, then replace with new oil. Disconnect the power, cover with a dust cover, and store in a dry, ventilated warehouse with a temperature of 5-30°C. Operate the equipment empty for 5-10 minutes each month to prevent component corrosion and jamming.

6. Daily and regular maintenance

6.1 Daily maintenance

Check all fluid connections for leaks, tighten loose joints, clean the A and B inlet filters, check the ISO pump wet cup level, add TSL sealant, clean the spray gun and mixing chamber, check nozzle wear, and drain condensate from the air dryer and air compressor

6.2 Weekly maintenance

Check the hydraulic oil level and oil quality; if necessary, additionally check the insulation layer of the heating hose for damage. Tighten all electrical terminals and apply grease to the moving parts of the equipment

6.3 Monthly maintenance

Calibration pressure sensors and temperature sensors, checking safety valves and overpressure protection devices, checking pump seals and O-rings for wear, thoroughly cleaning the entire fluid system

7. Core safety red line

7.1 High-voltage safety

High-pressure fluids can puncture the skin, causing amputation or even death; if it occurs, immediate medical surgery is required. When not spraying, the spray gun trigger lock must be locked; pointing the spray gun at anyone is strictly prohibited. Do not block leaks with hands, gloves, or scraps. Before any maintenance or cleaning, the pressure relief process must be strictly followed to confirm that the pressure is zero. Ruida Zhitu reminds you: High-pressure injuries are the most dangerous type of accident in polyurea construction and must always be vigilant.

7.2 Chemical safety

Isocyanate vapor is highly irritating and allergenic, potentially causing pulmonary edema and permanent respiratory tract damage. Contact with Ruida Zhifu Polyurea Coating can cause chemical burns and allergies; immediately rinse with plenty of water for more than 15 minutes. The use of halogenated hydrocarbon solvents such as 1,1,1-trichloroethane and dichloromethane is strictly prohibited, as they may explode and react with aluminum components. All waste must be treated according to hazardous chemical regulations and must not be dumped arbitrarily.

7.3 Operational safety

It is strictly forbidden to remove the protective cover during equipment operation to prevent injury from moving parts. The heated equipment surface and hose can reach temperatures above 80°C to prevent burns. Do not operate the equipment after fatigue, after drinking alcohol, or after taking medication. At least two people must cooperate on site, with one operating and one supervising.

8. Emergency and common fault handling

8.1 Emergency shutdown process

If a pipe burst, pressure loss of control, or personnel come into contact with Ruida Smart Polyurea Coating or fire, immediately press the red emergency stop button on the main unit. Quickly shut off the power supply and the main compressed air valve. Evacuate unrelated personnel and take emergency or firefighting measures as needed.

8.2 Handling of Typical Emergencies

8.3 Common Troubleshooting