Ratchet straps are versatile and essential tools for securing cargo during transportation, ensuringthat it remains stable and safe throughout the journey. Understanding the correct way to tie down a ratchet strap is crucial for ensuring the security of the load being transported. In this blog post, we will discuss the step-by-step process of properly tying down a ratchet strap to secure your cargo effectively.

How to Tie Down a Ratchet Strap

Before you begin, ensure that the ratchet strap is free of any twists or knots. Check the strap for signs of wear or damage that could compromise its strength. Inspect both the strap and the ratchet mechanism to ensure they are in good working condition.

Position the cargo on the vehicle or platform and locate suitable anchor points to attach the ratchet straps. Anchor points should be sturdy and secure to withstand the tension applied by the ratchet straps during transportation.

To thread the ratchet strap, follow these steps:

1. Pull the loose end of the strap through the mandrel of the ratchet mechanism.

2. Pull the strap tight to remove any slack, ensuring that it is positioned flat and not twisted.

3. Position the strap over the cargo and take the loose end under the anchor point, then back up and feed it through the mandrel of the ratchet again.

Operate the ratchet handle to tighten the strap. With each stroke of the handle, the strap will tighten around the cargo. Ensure that the strap is securely fastened and that there is no slack that could lead to movement during transit.

Once the strap is tightened to the desired tension, lock the ratchet mechanism to prevent accidental loosening. Some ratchet straps feature a locking mechanism or handle that secures the strap in place.

After tightening the ratchet strap, secure the loose end by tying it off or using Velcro straps to prevent it from flapping during transit. This helps to maintain a neat and secure strapping arrangement.

Before moving the cargo, perform a final check to ensure that the ratchet straps are securely fastened, and the load is stable. Check the tension of the straps and confirm that they are evenly distributed to prevent shifting during transport.

By following these steps and ensuring that the ratchet straps are correctly applied and securely fastened, you can effectively tie down your cargo for safe and secure transportation. Properly secured loads help prevent accidents, damage, and ensure a smooth and worry-free transport experience.

In lifting and rigging operations, safety is a strict requirement.
In the United States, the Occupational Safety and Health Administration (OSHA) has established clear regulations for sling use to protect workers and prevent accidents.
Any business that uses slings for hoisting, lifting, or material handling must understand and follow these standards.

1. Overview of OSHA Sling Standards

The main OSHA regulations for slings are found in:

• 29 CFR 1910.184 – General Industry

• 29 CFR 1926.251 – Construction

These cover:

• Types of slings (synthetic web, synthetic round, wire rope, alloy steel chain, etc.)

• Design and manufacturing requirements

• Inspection and removal from service

• Safe operating practices

• Identification and labeling requirements

The purpose is to ensure slings are used within their rated capacity, remain in good condition, and are handled by trained personnel.

2. Identification and Labeling

Each sling must have a permanent tag showing:

• Manufacturer’s name or trademark

• Rated load for each hitch type (vertical, choker, basket)

• Material type

• Length and width (for synthetic slings)

• Any warnings or limitations

If the tag is missing or unreadable, the sling must be removed from service until proper identification is restored.

3. Inspection Requirements

Slings must be inspected regularly for wear, damage, or defects.
For synthetic web and round slings, check for:

• Cuts, fraying, or broken stitching

• Burns or chemical damage

• Knots or severe abrasion

• UV degradation

Inspection frequency:

• Visual check before each day’s use

• Periodic inspection based on service conditions

Any sling showing signs of damage must be removed from service immediately.

4. Safe Use Practices

To comply with OSHA requirements:

• Never exceed the Working Load Limit (WLL)

• Avoid shock loading

• Use corner protectors or padding at sharp edges

• Store slings in a dry, clean place, away from sunlight and chemicals

• Use slings only for their intended purpose

5. Importance of Compliance

Following OSHA standards prevents accidents, reduces equipment damage, and protects workers.
Non-compliance can result in fines, project delays, and legal liability.

How are the inlet and outlet pressures produced of the Rotary lobe pump?

The inlet and outlet pressures of a rotary lobe pump are generated through the cyclic volumetric changes of its sealed working chambers and the positive displacement of fluid by the intermeshing lobes. Here’s a detailed breakdown of the mechanism:

1. Core Structure: The Basis of Pressure Generation

A rotary lobe pump consists of:

· Two counter-rotating lobes (cam-shaped rotors) with precise meshing.

· A stationary pump casing that forms a tight seal with the lobes, creating multiple enclosed "working chambers" between the lobes and the casing.

These working chambers are critical—their volume expands and contracts as the lobes rotate, driving fluid movement and pressure changes.

2. Inlet Pressure: Negative Pressure from Volume Expansion

At the inlet (suction side), pressure is generated by the expansion of the working chambers, which creates a low-pressure zone to draw fluid in:

1. As the lobes rotate, they separate at the inlet region, causing the volume of the working chambers in this area to increase rapidly.

2. According to the principle of volumetric displacement, the expanding volume reduces the pressure inside the chambers (below atmospheric pressure or the upstream system pressure).

3. This negative pressure (suction) overcomes the resistance in the inlet pipeline, pulling fluid into the chambers until they are fully filled (when the lobes are maximally separated).

Key Note: Inlet pressure is typically slightly below atmospheric pressure. Its magnitude depends on inlet line resistance (e.g., pipe length, bends, fluid viscosity)—higher resistance requires a stronger negative pressure to draw fluid effectively.

3. Outlet Pressure: Positive Pressure from Volume Contraction

At the outlet (discharge side), pressure is generated by the contraction of the working chambers, which forces fluid out under pressure:

1. As the lobes continue to rotate, the filled working chambers move toward the outlet. Here, the lobes re-mesh, causing the chamber volume to decrease sharply.

2. Since fluids are nearly incompressible, the shrinking volume compresses the trapped fluid, increasing the pressure inside the chambers.

3. When the lobes fully mesh, the working chambers collapse completely, forcing the pressurized fluid out of the outlet into the discharge pipeline—creating outlet pressure.

Key Note: Outlet pressure is determined primarily by the resistance of the downstream system (e.g., pipe friction, elevation, backpressure from equipment). Higher downstream resistance requires greater pressure to push fluid through, and the pump maintains this pressure by continuing to reduce chamber volume.

4. Sustaining Pressure: Sealing and Continuous Operation

Stable inlet and outlet pressures rely on two critical factors:

· Tight Sealing: Minimal clearance (typically 0.1–0.5 mm) between the lobes and casing, and between the lobes themselves, prevents fluid leakage. Leakage (e.g., high-pressure fluid from the outlet flowing back to the inlet) would reduce pressure differentials and efficiency.

· Continuous Rotation: The lobes’ constant rotation ensures overlapping cycles of chamber expansion (suction) and contraction (discharge), delivering a steady flow and maintaining consistent pressure levels (minimizing pulsation).

Summary

The pressures in a rotary lobe pump arise from the dynamic volumetric changes of its working chambers:

· Inlet pressure is a negative pressure (suction) created by expanding chambers, drawing fluid in.

· Outlet pressure is a positive pressure generated by contracting chambers, forcing fluid out.

· Both pressures are balanced against system resistance (inlet resistance for suction, downstream load for discharge) and sustained by tight sealing and continuous rotation.

This mechanism makes rotary lobe pumps ideal for high-viscosity, shear-sensitive, or solids-laden fluids, as they rely on positive displacement rather than centrifugal force.

Many industrial operators face significant challenges when transferring liquid sulfur, particularly with equipment reliability. A common frustration is the rapid failure of gear pumps—often within just 30 hours of operation—due to sulfur solidification and pump corrosion. Let's explore why this happens and how BONVE's specialized rotary lobe pumps provide a superior solution.

The Problem: Why Gear Pumps Fail with Liquid Sulfur

Liquid sulfur presents unique handling challenges that expose critical limitations in standard gear pump designs:

1. Solidification Risks With a melting point of 115-120°C, liquid sulfur rapidly solidifies into hard lumps when cooled. Gear pumps' tiny operational clearances (0.05-0.2mm) get easily blocked by solidified sulfur, causing jamming or catastrophic damage during forced operation.

2. Corrosive & Abrasive Nature High-temperature liquid sulfur corrodes common steels, while impurities (unmelted sulfur, rust particles) act as abrasives—accelerating wear on gear surfaces and bearings.

3. Design Misalignment Gear pumps rely on precise clearances and media lubrication—both problematic for sulfur. Their seals often fail under high temperatures, allowing air ingress that further accelerates sulfur solidification.

4. Operational Vulnerabilities Inadequate insulation, improper shutdown procedures, or insufficient preheating exacerbate these issues, leading to premature failure.

BONVE's Engineered Solution: Rotary Lobe Pumps for Liquid Sulfur

Our rotary lobe pumps are specifically designed to address liquid sulfur's unique challenges, delivering extended service life through these critical features:

· Superior Material Construction Duplex 2205 stainless steel provides exceptional resistance to sulfur's corrosive effects and abrasive particles.

· High-Temperature Sealing FFKM O-rings withstand operating temperatures up to 200°C, maintaining integrity where standard rubber compounds fail.

· Reliable Shaft Sealing Single-face mechanical seal without flushing minimizes potential failure points while preventing sulfur leakage.

· Integral Temperature Control Heating jackets on both casing and cover maintain optimal sulfur temperature, preventing solidification.

· Operational Safeguards (End-user responsibility) Full preheating before restart ensures smooth operation and prevents damage from solidified sulfur.

Application Example

For a typical liquid sulfur transfer application (200°C, 10m³/Hr, 4 Bar), we recommend Rotary Lobe Pump model 80BV12-20 :

Why Choose BONVE for Liquid Sulfur Transfer?

Our rotary lobe pumps' robust design, larger operational clearances, and sulfur-specific materials overcome the limitations of gear pumps. By addressing the root causes of failure—solidification, corrosion, and design constraints—BONVE pumps deliver reliable performance for liquid sulfur applications.

Contact our technical team today to discuss your specific liquid sulfur transfer requirements and discover how BONVE's solutions can reduce downtime and maintenance costs.

In today’s global lifting and rigging industry, safety, durability, and compliance are more important than ever. At NANJING D.L.T SLING CO., LTD, we are proud to be one of China’s leading manufacturers of high-quality synthetic lifting slings and tie-down systems. With a strong focus on safety standards, innovation, and customer satisfaction, we have become a trusted supplier to clients across Europe, North America, Southeast Asia, and beyond.

Our Core Products

We specialize in the production of a wide range of lifting and securing products, including:

• Webbing slings (flat webbing slings in double-ply or single-ply)

• Round slings (including ultra heavy-duty slings with capacities up to 1100T)

• High-performance fiber slings (e.g., UHMWPE slings)

• Ratchet tie-down straps and lashing systems

• Lifting nets, tow straps, and more

All products are manufactured with precision using premium materials such as high-strength polyester or UHMWPE, ensuring both strength and longevity under heavy workloads.

Certified for Safety and Quality

At D.L.T, we understand that our customers demand more than just a product — they demand trust. That's why our factory adheres to strict international standards, including EN1492-1/2, EN12195-2, and ASME B30.9, and we hold CE and GS certifications for many of our items. Our slings are designed with safety factors such as 7:1 or 5:1, and each item is carefully inspected before shipment.

Customization & Private Labeling

We know that every client has unique needs. We offer:

• Custom lengths and widths

• Customer logos on labels or webbing

• OEM/ODM services for long-term partners

Our products are widely used in industries such as logistics, construction, shipyards, and heavy machinery.

Global Reach with Local Service

With years of export experience and a multilingual sales team, we’ve established long-term partnerships with clients in France, Germany, Canada, Australia, Indonesia, and many other countries. Whether you're a distributor, importer, or industrial end-user, we’re here to support your business with professional service and fast delivery.

Are You Looking for a Reliable Sling Supplier from China?

We welcome you to contact us for samples, quotations, or custom orders. Let us help you lift your business — safely and efficiently.

📧 Email: sales@dlt-sling.com
🌐 Website: www.dlt-sling.com

If the pump outlet is reduced in size, what will be the consequences?  

Among the customers of Anhui Shengshi Datang, the purchase of chemical centrifugal pumps and metal magnetic drive pumps is quite common. However, some clients frequently provide incorrect specifications. When it comes to on-site installation, they discover the discrepancies and assume that minor adjustments will make the pumps usable—but this is not the case.

If a 1-inch pump outlet is fitted with an adapter to reduce it to 8 points (a smaller diameter), will this have any impact on the pump? Can reducing the outlet size achieve a throttling effect? Will increasing the outlet size result in higher head pressure?  

First, it’s important to understand one key point: every pump has its fixed performance parameters. Whether the pump outlet is enlarged or reduced, the head pressure will neither increase nor decrease.  

When the pump outlet is reduced in size, the outlet pressure will increase, but the pump’s parameters remain unchanged. If the pump outlet is enlarged, the pump can only operate up to its maximum parameter limits. Changing the outlet size is a manual adjustment and does not alter the pump’s inherent performance.  

Now, let’s discuss the potential impacts of reducing the pump outlet size:  

01 Reducing the pump outlet size is equivalent to partially closing the outlet valve. This increases the pump pressure and reduces the flow rate. The current draw of the pump may decrease slightly, but if the pump experiences vibration, the vibration will not diminish—it might even worsen.  

02 Reducing the outlet size does not change the pump’s head pressure. However, if external conditions change, it may affect the pump’s overall performance, potentially leading to higher outlet pressure. This change is dynamic, meaning that reducing the outlet size can act as a throttle, increasing the outlet pressure.  

03 If the operating conditions are not ideal, reducing the outlet size may shorten the pump’s service life. But if the pump operates normally after the adjustment, there is no need for concern.  

04 As long as the reduction in outlet size is not excessive, it should not cause major issues. However, if the reduction is too significant, it may impede water flow, increasing pressure on the pump and overloading the motor.  

05 Changes in the pump outlet size directly affect the flow rate, as industry professionals know. A larger outlet increases the flow rate, while a smaller outlet decreases it.

When adjusting the size of the pump outlet, it is important to consider the performance curve of the pump, the reduction of system resistance and dynamic flow rate, which leads to the diameter of the fluid velocity distribution, resulting in higher resistance and losses, and may change the operating point curve of the pump. Due to the potential throttling effect, the pump's head or maximum efficiency point will not change.

For chemical pumps and metal magnetic device pumps, improper filtration may result in frequency, vibration, or overheating, especially in high viscosity or corrosive fluid applications. In order to maximize performance, it always maintains consistency with hydraulic calculations, pump socket dimensions, pipe diameters, and system requirements.

We, Anhui Shengshi Datang, are willing to communicate and exchange professional technology related to pumps with everyone. Welcome everyone to discuss, and feel free to ask any questions about selection.

Key Differences Between Magnetic Drive Pumps, Centrifugal Pumps, Process Pumps, and Axial Flow Pumps​​

Anhui Shengshi Datang possesses mature design technology and manufacturing capabilities, providing customers with professional technical support and services to create high-performance, reliable equipment of exceptional quality.

When selecting industrial pumps for fluid transfer applications, understanding the differences between magnetic drive pumps, centrifugal pumps, chemical process pumps, and axial flow pumps is crucial. Magnetic drive pumps use non-contact magnetic coupling to eliminate leaks completely, making them ideal for hazardous, toxic, or corrosive fluids—though they have slightly lower efficiency. Centrifugal pumps are simple, reliable, and cost-effective, best suited for medium-to-high flow rates with low-to-medium head pressure in water supply and HVAC systems. Chemical process pumps are engineered for harsh environments, featuring corrosion-resistant materials to handle acids, alkalis, and high-temperature fluids with superior sealing. Axial flow pumps specialize in high-volume, low-pressure applications like flood control, irrigation, and cooling water circulation.

For optimal performance, consider fluid properties, flow requirements, and sealing needs: choose magnetic pumps for leak-proof operation, centrifugal pumps for general water transfer, process pumps for aggressive chemicals, and axial pumps for large-scale liquid movement. This guide helps ensure safe, efficient, and cost-effective pump selection.

No Leakage vs. Stainless Steel Submersible Pumps: Key Differences

Anhui Shengshi Datang Chemical Equipment Group manufactures a series of magnetic drive pumps and submersible pumps, backed by a professional team and advanced technology. We welcome you to choose us.

When handling corrosive liquids, choosing between a No Leakage Anti-Corrosion Submersible Magnetic Drive Pump and a Stainless Steel Corrosion-Resistant Submersible Pump depends on chemical resistance, durability, and application needs.

No Leakage Magnetic Drive Pump

1.100% leak-proof (no mechanical seal, magnetic coupling)

2.Best for harsh chemicals (PP/PVDF/ETFE construction resists strong acids/alkalis)

3.Low maintenance (fewer moving parts)

Ideal for: Chemical processing, electroplating, semiconductor industries

Stainless Steel Submersible Pump

1.High durability (304/316 stainless steel resists rust & mild chemicals)

2.Handles heat & abrasives (better for hot liquids, slurries, and oils)

3.More affordable but needs occasional seal maintenance

Ideal for: Food processing, marine, oil/gas, industrial drainage

Which One to Choose?

1.Magnetic Drive Pump–Zero leakage, extreme chemical resistance

2.Stainless Steel Pump–Heavy-duty, cost-effective for high temps/abrasion

Need the best corrosion-resistant pump? Contact us for expert recommendations!

Applications of Chemical Pumps

Here is an introduction to the application of chemical pumps. For further details or quotations regarding magnetic drive pumps and centrifugal pumps, please contact Anhui Shengshi Datang.

Chemical pumps are designed to remove crematory liquids from bottles, barrels, tanks or other containers and are widely used in industries such as chemical processing, petroleum, metallurgy, light industry, synthetic fibers, environmental protection, food and pharmaceutical products. These pumps play a crucial role, due to their stable performance, reliable seals, aesthetic design and easy maintenance, to improve product quality, minimize leakage, prevent pollution and improve environmental conditions. They are suitable for the transport of crematory or highly reactive media at different temperatures in sectors such as power plants, pharmaceuticals and the production of synthetic fibres.

Different types of glass fiber chemical pumps are available, such as corrosion resistant pumps, high temperature pumps, standard chemical process pumps and magnetic drive pumps. Chemical pumps are also widespread in water supply, heating, air conditioning, cooling and operating systems, fire protection, irrigation and rainwater. They are ideal for residential, industrial, horticultural and agricultural applications, especially for increasing pressure in environments with lower noise and piping, even corrosive, explosive or particulate.

As a trusted lobe pump manufacturer, we understand that efficiency, reliability, and product integrity are non-negotiable for your operations. Whether you’re in food & beverage, pharmaceuticals, chemicals, or wastewater treatment, our (BONVE) lobe pumps are engineered to address critical pain points while delivering standout performance. Here’s how they make a difference:

Core Advantages of Our Rotary Lobe Pumps

Gentle, Non-Destructive Fluid Handling

Unlike centrifugal or gear pumps that can shear, agitate, or damage sensitive fluids, Bonve lobe pumps use two non-contact lobes to create a smooth, low-pulse flow. This design preserves the integrity offragile media—think yogurt with fruit pieces, pharmaceutical slurries, or viscous creams. No more broken particles, separated emulsions, or compromised product quality.

Versatility Across Fluids and Viscosities

From thin liquids (like water or oils) to highly viscous materials (such as adhesives, pastes, or sludge) and even fluids with solids (e.g., wastewater with debris or food batters with chunks), our pumps handle it all. They adapt to varying viscosities without losing efficiency, eliminating the need for multiple pump types in your facility.

Self-Priming and Dry-Run Capable

Bonve lobe pumps excel at self-priming, meaning they can start pumping from a dry state and pull fluid from below-tank levels—no manual priming required. They’re also designed to withstand short dry runs without damage, reducing the risk of breakdowns if lines run empty unexpectedly.

Easy Maintenance and Hygienic Design

For industries like food and pharmaceuticals, hygiene is critical. Our pumps feature aclean-in-place (CIP)andsterilize-in-place (SIP)compatible design, with smooth surfaces, minimal dead zones, and quick-disconnect components. This cuts down on cleaning time, reduces downtime, and ensures compliance with strict regulatory standards (e.g., FDA, EU 10/2011).

Consistent Performance Under Pressure

Problems Solved: Real-World Impact

Whether you’re looking to protect product quality, streamline operations, or reduce costs, our rotary lobe pumps are built to solve your toughest challenges. Let’s connect to discuss how we can tailor a solution for your specific needs.