Roots Blowers for Industrial Gas Conveying

Product Overview

As positive-displacement tri-lobe roots blowers, SHANGU® RSR and MTRG series manufactured by Shandong Mingtian Machinery Group deliver constant volumetric airflow regardless of pipeline back-pressure fluctuation. They are widely used for dilute-phase pneumatic conveying, special-gas boosting, powder closed conveying, material fluidization and process air supply. The blowers can handle air, nitrogen, biogas, coal gas, CO₂ and other media, covering building-material, grain-processing, chemical, power-plant, metallurgy and environmental-protection sectors. Customized versions are available for corrosive or flammable-explosive process gas.

Little-known practical notes

1. All catalog nominal flow data are under standard suction condition (20 ℃, 101.3 kPa, RH 65 %). At high-altitude or high-inlet-temperature sites, mass-flow capacity drops. Flow margin of 8-12 % per 1000 m elevation rise is required; do NOT directly adopt catalogue figures without site-condition correction.
2. For pneumatic conveying, pressure loss is jointly determined by pipe length, elbow count and solid-gas ratio. Many project-selection failures result from ignoring total pipeline resistance while only calculating material throughput, which causes pipe-blockage and insufficient conveying capacity.
3. Never apply pipeline load onto blower flanges. External pipe weight will deform casing, shift rotor clearances, trigger flow decay and abnormal noise.
4. For flammable-dust-laden gas service: explosion-proof motor alone is insufficient. Anti-static rotor, upgraded sealing grade and high-efficiency inlet filtration shall be implemented as a complete package.

Applicable Standards

1. JB/T 8941.1-2014: Roots type blowers for general purpose — Part 1: Specification, Chinese machinery-industry standard for blower material, clearance, general requirements and factory inspection, superseding JB/T 8941.1-1999.
2. JB/T 8941.2-2014: Roots type blowers for general purpose — Part 2: Performance test method, benchmark for factory performance acceptance test.
3. GB/T 2888-2008: Method of noise measurement for fans and roots blowers.
4. GB 28381-2026: Minimum allowable values of energy efficiency and energy-efficiency grades for blowers, mandatory national energy-efficiency standard for positive-displacement blowers.

Standard-equivalence statement JB/T 8941.1-2014 is MOD (Modified Adoption) of ISO 1217:2009 Displacement compressors-Acceptance tests, NOT identical adoption. Third-party test reports based on ISO 1217 are for reference only and cannot replace JB/T-compliant acceptance for Chinese-domestic projects. Differences exist in 24-h heavy-duty test criteria, allowable internal-leakage deviation and accessory assessment rules. Pay attention for overseas-retrofit projects.

Unit-Conversion Reference (For tender & cross-border comparison)

Pressure: 9.8kPa = 0.1 kgf/cm² = 1000 mmH₂O = 1.422 psi = 0.098 bar
Flow: 1 m³/min = 60 m³/h = 35.71 CFM
Gas state conversion: Standard suction-state flow
(Qs(20℃)=Qn(0℃)×1.0732

Important note for gas project: For combustible gas, gas compressibility factor and molecular-weight correction shall be calculated. Air-based conversion formula cannot be directly used. Clearly mark Gauge or Absolute pressure in inquiry documents.

Key Buyer Concerns (Explicit Requirements & Hidden Field Pain-points)

✅ Explicit Requirements

1. Flow & pressure matching material throughput and total pipeline resistance;
2. Media compatibility: clean air / corrosive gas / flammable-explosive gas;
3. Capital-budget and motor-power requirements;
4. Noise & vibration compliance for plant-site environment.

✅ Hidden Pain-points (Production loss often outweighs equipment price gap)

1. Media-adaptation risk: For dusty or corrosive-gas service, inadequate material / sealing upgrades lead to rapid rotor abrasion-corrosion and gradual flow degradation.
2. 7×24-h continuous-run reliability: For pressure ≥ 60 kPa, water-cooling is mandatory. Overheating, oil emulsification and bearing seizure trigger unplanned full-production-line shutdown.
3. Pipe-matching risk: Excessive elbows and poor layout raise back-pressure and motor over-current tripping. Total pipeline resistance must be calculated instead of relying purely on theoretical conveying-flow.
4. Total-life-cycle cost: Evaluate power consumption, spare-part expense and outage loss, not merely initial procurement cost. Low-cost units bring heavy hidden operational risks.
5. Customization & after-sales support: Special-gas service requires anti-wear / anti-corrosion / explosion-proof modification. End-users require condition calculation, fast spare-part supply and rotor-repair capability.

Core Advantages | SHANGU® by Shandong Mingtian Machinery Group

Shandong Mingtian Machinery Group is a national Hi-Tech Enterprise and national-level Specialized-Sophisticated “Little-Giant”. Two industrial parks are equipped with 5-axis machining centers, high-speed dynamic-balancing testers and 3-coordinate measuring instruments. R&D team includes professor-level senior engineers, PhD and master-degree specialists with university-industry-research cooperation. SHANGU® is a well-known trademark of Shandong Province.

1. Constant-volume anti-back-pressure performance: Tri-lobe rotors pass full high-speed dynamic balancing. Stable output even under variable pipeline resistance, avoiding flow drop for pneumatic-conveying lines.
2. Flexible customized solutions:
   1. Wear-resistant option: tungsten-carbide coating for rotors plus wear-resistant liners for dust-laden media;
   1. Anti-corrosion option: heavy-duty epoxy coating as standard; 304 / 316 L stainless-steel rotor & housing for highly corrosive gas;
   1. Explosion-proof package: Exd ⅡBT4 motor, anti-static rotor and explosion-proof sealing assembly for biogas / coal-gas and flammable-gas service.
3. Water-cooling for high-pressure duty: Units ≥ 60 kPa(gauge) equipped with circulating water-cooling system for non-stop 7 × 24 h full-load service.
4. Complete package delivery: Inlet filter, inlet-outlet silencers, safety relief valve, swing check valve, anti-vibration base, flexible expansion joints. Optional VFD cabinet delivers 18-30 % energy-saving for variable-output-demand production lines.
5. Full-scope factory acceptance: Every blower undergoes performance, noise and vibration test complying with JB/T & GB/T standards. Complete test reports are available for tender and overseas-project acceptance.
6. Full-process technical service: Site-condition survey, pipe-resistance calculation, altitude-temperature-corrected selection, installation guidance, retrofitting for legacy blowers, regular-maintenance documentation.

Application-Scenario & Model-Selection Reference

Selection tips: Reserve 10-15 % margin for flow-pressure parameters. Choose MTRG water-cooled series for pressure＞88.2 kPa. Apply customized material/sealing for flammable / corrosive media. 1-op-1-standby configuration recommended for critical production-lines.

Application Scenario	Working-condition Description	Recommended Model	Flow(m³/min)	Gauge Pressure(kPa)	Motor Power(kW)	Remarks
Grain / light-industry dilute-phase pneumatic conveying	Grain-particle conveying, short-to-medium pipelines, fluctuating throughput	RSR-100	5-18	49-68.6	7.5-30	Epoxy coating; VFD optional; upgrade inlet dust filter
Building-material, fly-ash & limestone-powder conveying	Powder media, medium-length pipeline, continuous-run	RSR-150A	18-35	58.8-88.2	30-75	Water-cooling recommended above 60 kPa; add wear-resistant coating for dusty media
Chemical-plant special-gas boosting, biogas / coal-gas conveying	Flammable-hazard process-gas, long-distance pipeline	MTRG-250	35-60	68.6-117.6	75-132	Mandatory water-cooling; full explosion-proof & anti-static package; recommend 1-operating + 1-standby
Bulk-powder conveying for power-plant & smelter	Large throughput, long high-resistance pipelines, 7×24-h non-stop production	MTRG-300	60-105	88.2-120	90-160	Heavy-duty water-cooled package; site survey & total-pipe-resistance calculation required
Silo-aeration, material fluidization & process combustion-air supply	Large-flow low-pressure duty for ash-silo fluidization, boiler air-supply	RSR-175A~RSR-200	15-48	29.4-58.8	22-90	General-purpose anti-corrosion, optimized for large-flow low-pressure gas supply

Model Explanation

• RSR Series: General-purpose tri-lobe roots blowers (belt / coupling drive), for medium-low-pressure gas-conveying applications.
• MTRG Series: Mingtian heavy-duty water-cooled roots blowers, designed for high-pressure, long-distance special-gas and heavy-duty continuous-process service with built-in cooling-water ports.

Installation & Maintenance Guidelines

1. Never subject blower flanges to pipeline weight. Install flexible expansion joints on both inlet and outlet to isolate pipe-stress and vibration transmission.
2. For dusty-media conveying: deploy properly-rated inlet filters and shorten filter-replacement cycle to avoid rotor abrasion by incoming particles.
3. Equip filter elements inside cooling-water circuit for water-cooled blowers for regular descaling.
4. Shift-based inspection of pressure, running current and bearing temperature. For special-gas duty, shorten service interval for lubricant and sealing components. Inspect rotor wear and seal-condition during annual shutdown, replace wearing-parts pro-actively to avoid unplanned outage.

Disclaimer: All tabulated parameters serve for general reference only. Actual project shall rely on condition-corrected custom proposal from our technical engineers.

📩 Inquiry — Please Provide Below Information for Custom-made Solution & Quotation

Kindly share your project details as below, our engineering team will work out customized blower solution and formal commercial quotation for you:

1. Medium to be handled (air / nitrogen / biogas / coal gas / corrosive gas etc.)
2. Required working flow (m³/min or CFM) and working gauge pressure (kPa or psi)
3. Application type: pneumatic conveying / gas boosting / silo aeration / other purpose
4. Material characteristics (if for powder conveying: material name, solid-gas ratio, throughput capacity)
5. Pipeline data: total pipe length, quantity of elbows, vertical lifting height
6. Site ambient condition: altitude, average inlet air temperature
7. Special requirement: explosion-proof / anti-corrosion / water-cooling / VFD / standby unit requirement
8. Power supply standard (voltage & frequency)
9. Other site-specific requirements

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🌐 Official Website: https://www.mtrootsblower.com