Grain Pneumatic Conveying Roots Blower | Shangu (Mingtian Machinery) Solutions for Grain Depots & Processing Plants

Traditional manual handling and belt-type mechanical conveying for grain storage, processing and terminal transshipment suffer from high material loss, heavy dust pollution and high grain breakage rate, which can hardly satisfy the production requirements of modern grain enterprises. Closed pneumatic conveying adopts Roots blowers to generate stable airflow, realizing fully-piped transportation for wheat, corn, rice, coarse cereals and grain powder. It has become a core solution for grain industry to boost efficiency and cut operating costs.

As the core positive-displacement air source, the performance, manufacturing standards and parameter matching of Roots blowers directly determine the stability of suction-type, pressure-type combined conveying systems. Shandong Mingtian Machinery Group, under the brand Shangu, is a national-level “Specialized, Refined, Differential & Innovative Little-Giant” enterprise with decades-long experience in Roots blower manufacturing. Our products comply with Chinese industrial standards and support unit conversion for overseas export projects. We deliver complete blower packages for grain depots, feed mills and port grain-unloading projects worldwide.

1. Applicable Standards

Valid Chinese Domestic Standards

1. JB/T 8941.1-2014 General-purpose Roots blowers — Part 1: Technical specifications (Current effective) Specifies overall technical requirements and material criteria. Maximum allowable intake temperature ≤45 °C; solid particle content in medium ≤100 mg/m³. Applicable for both positive-pressure and negative-pressure Roots blowers for grain conveying.
2. JB/T 8941.2-2014 General-purpose Roots blowers — Part 2: Performance test methods (Current effective) Defines factory test benchmarks for airflow, pressure and shaft power. All performance data in Mingtian official catalogues are tested under standard intake conditions: 20 °C, absolute pressure 101.325 kPa, relative humidity 65%, which corresponds to the labelled inlet flow Qs in our datasheets.
3. GB/T 2888-2008 Methods of noise measurement for fans and Roots blowers Mandatory noise-testing standard for environmental compliance of on-site operation.
4. GB 28381-2012 Limited values of energy efficiency and energy efficiency grades for blowers Compulsory energy-efficiency regulation for long-term power-consumption evaluation during equipment selection.

Notes on international standard equivalence: The test method specified in JB/T 8941.2-2014 refers to ISO 1217 for positive-displacement compressors but is NOT equivalent. Test reports based on Chinese standards cannot substitute ISO-compliant reports for overseas projects. Separate performance recalculation shall be conducted for export working conditions.

Critical Unit Conversion (For Domestic & Overseas Projects, Built-in our product catalogue)

Qs in our catalogue stands for inlet flow under standard intake condition in m³/min. Overseas clients commonly use CFM for flow; pressure units include kPa, kgf/cm², mmHg and PSI.

1. Flow: 1 m3/min = 35.314 CFM

2. Pressure: 9.8 kPa = 0.1 kgf/cm2 = 73.5 mmHg = 1.422 PSI

3. Flow correction between reference state (0 °C) and standard intake state (20 °C):Qs=Qn x1.0732

Common industry pitfall: Many purchasers confuse Nm³/min (0 °C reference condition) with catalogue Qs (20 °C intake condition). Direct adoption will lead to insufficient actual airflow and pipeline blockage. Flow recalculation is mandatory for high-altitude sites or intake temperature deviating from 20 °C.

2. Grain Conveying Challenges & Customer Key Concerns

Grain pneumatic conveying falls into three categories: negative-pressure suction (grain suction machine), positive-pressure pressure conveying, suction-pressure combined conveying. Buyers focus on not only price but also the practical points below:

1. Low grain breakage rate: Gentle airflow to avoid particle collision and grain damage and preserve grain quality.
2. Continuous stable operation: Capable of 24-hour non-stop running; high-grade rotor dynamic balancing to limit unit vibration.
3. Dust-proof protection: Grain dust may wear impellers and bearings. Filtration and gas-solid separation are essential for negative-pressure suction working conditions.
4. Proper performance margin: 10-15 % margin for airflow & pressure shall be reserved to compensate pipeline resistance, elbow loss and system air leakage to prevent pipe clogging.
5. Noise & environmental compliance: Low-noise unit plus complete silencer packages for plants near residential zones.
6. Low maintenance cost: Universal spare parts with fast delivery lead-time.
7. Flexible configuration: Belt-driven or coupling direct-drive options; frequency-conversion compatible for variable throughput.
8. Export-oriented requirements: Unit conversion, English datasheets, custom motor voltage, performance recalculation per ISO working-condition requirements.

Little-known practical pain point (rarely seen online): Grain usually contains 10-14 % moisture; damp dust tends to adhere inside blower casing. Material back-flow into blower upon shutdown is a major risk for negative-pressure suction systems. Besides the blower itself, check valves, blow-off valves and vacuum safety valves must be equipped. Most on-site failures result from missing pipeline accessories instead of blower defects.

3. Shangu (Mingtian Machinery) Model Matching for Grain Pneumatic Conveying

Mingtian Shangu series includes MTS, RSR, MTR-V vacuum pump, MTRF / MTRG heavy-duty Roots blowers. Performance range: flow 0.6-1057 m³/min, pressure rise 9.8-196 kPa, covering small-scale lab grain suction equipment up to large-port high-tonnage grain-handling projects.

Series	Working Pressure	Flow Range	Typical Grain-industry Applications
MTS 3-lobed Roots Blower (Belt-drive)	9.8-98 kPa positive pressure	1.1-60 m³/min	Small-to-medium grain depots, feed-mill dilute-phase positive-pressure conveying; compact layout. Optional intelligent control cabinet for no-load start-stop, fit for intermittent grain-warehouse transfer.
RSR 3-lobed Roots Blower (Belt-drive / Direct-coupling)	9.8-98 kPa positive pressure	0.6-184 m³/min	Mainstream model for domestic grain projects: grain depot transfer, grain-processing plant raw-material transportation. Mature mass-production, high spare-part compatibility. Complete accessories including silencers, safety valves, flexible joints. Suitable for 24-hour continuous duty.
MTR-V Roots Vacuum Pump (Negative-pressure series)	-9.8 ~ -49 kPa negative pressure	1-420 m³/min	Preferred for grain suction machines: port grain unloading, grain-depot vacuum suction conveying. Work with cyclone dust separators to prevent grain-dust ingress for long-distance suction.
MTRF / MTRG Heavy-duty Roots Blower	9.8-147 kPa positive pressure	40-1057 m³/min	Large-scale ports and grain-oil processing plants for long-distance, high-throughput dense-phase conveying. Water-cooled design for heavy-duty continuous operation.

Model-selection tips

1. Small-to-medium depots with low throughput (5-15 tons/h): Prioritize MTS or small-frame RSR models.
2. Port grain suction & vacuum feeding: Adopt MTR-V vacuum pumps.
3. Long-distance conveying with multiple elbows and vertical lifting height＞15 m: Choose MTRF / MTRG heavy-duty models and calculate pipeline resistance with sufficient pressure margin.
4. For damp grain-dust working conditions: Custom wear-resistant coating for impellers is available to reduce adhesion-caused wear.

4. Core Advantages of Mingtian Shangu Products

1. Strong R&D & Manufacturing Capacity: National-level High-tech Enterprise & Specialized-Refined-Differentiated-Innovative Little-Giant Enterprise. Technical team including professor-level senior engineers, PHD and master-degree specialists. Equipped with 5-axis machining centers and high-speed dynamic-balancing test benches. All impellers undergo high-precision dynamic balancing. Unit vibration performance exceeds the limit value specified in JB/T 8941.1-2014 for low-failure long-time running.
2. Credible Performance Data: Every unit passes factory performance test complying with JB/T 8941.2-2014, catalogue data is repeatable on-site. We provide professional flow-pressure correction for high-altitude sites or abnormal intake-temperature to avoid wrong model-selection.
3. Flexible Configuration: Belt-drive or direct-coupling options. Complete accessory packages: silencers, air filters, safety valves, check valves, flexible expansion joints, PLC intelligent control cabinets supporting no-load startup & overload protection. Custom base / flange dimension available for legacy-equipment retrofitting projects.
4. Dual support for domestic & export orders: English / Chinese catalogues, dual-set parameter sheets in m³/min & CFM, custom motor voltages for overseas grain-equipment OEM customers.
5. Professional Technical Service & Spare-part Support: In-house spare-parts warehouse for fast lead-time. Send us your project parameters: conveying method, hourly throughput, horizontal distance, vertical lifting height, elbow quantity, grain moisture content, site altitude & ambient temperature, and we will deliver custom blower proposal for you.

5. Contact Information

For full PDF catalogue, performance datasheets and custom grain-conveying solution proposals, please feel free to reach us:
📞 WhatsApp / Wechat: +86 187 5316 3090
📧 Email: [email protected]
📞 Phone / WhatsApp: +86 187 6611 7068
📧 Email: [email protected] | [email protected]
🌐 Official Website: https://www.mtrootsblower.com

Reminder for model-selection: Please provide key project parameters: conveying mode (negative-pressure suction / positive-pressure pressure conveying), hourly throughput, horizontal conveying distance, vertical lifting height, number of elbows, material moisture content, site altitude and ambient temperature. This helps avoid over-sized units or insufficient pressure / airflow leading to pipeline blockage.