How do you calculate the safe working load of chains?

To calculate the safe working load (SWL) of chains, you generally use a fraction of the chain's minimum breaking strength. Typically, this is 1/4 or 1/5 of the minimum breaking strength. This built-in buffer ensures safety when using the SWL number. It's essential to confirm the SWL with the chain's packaging or identification. Inexpensive chains from big-box stores might only have a 1/2 safety factor, which is insufficient. Do not lift a 200lbs object with a chain that has a 200lbs breaking strength.

Lieying Group offers high-quality chains exported worldwide for different industries. Our goal is to provide high value-added products for our customers. Let's work together to create a better future.

If you plan to hang objects over humans or expensive property, it's crucial to use chains specifically designed for overhead lifting with additional strength. Consider scenarios where a single chain or attachment point breaks, causing the other chains to support the additional weight. Movement can also affect load distribution. Even if you think the mounted setup will remain static, unforeseen events like someone hanging on it or an earthquake could occur.

Chains are relatively inexpensive, but human safety is paramount. For supporting 800lbs using 4 corners, opt for chains with a 1000lb working load with grade-8 or AN-quality attachments.

1. Can You Build My Spec?

A detailed spec sheet is essential when ordering equipment and finding a manufacturer. Your spec sheet should outline production volume, material, process requirements, electrical needs, and other specific requirements. The more detailed your spec sheet, the more precise the build. One of the initial questions to ask your equipment manufacturer is if they can meet your specifications.

• Production amount
• Electrical rating
• Environmental hazards (combustible dust, extreme heat, moisture, etc.)
• Material hazards (caustic materials, respirable dust hazards, etc.)
• Build material requirements (stainless steel, food-grade, polyethylene, etc.)
• Sanitation regulations
• Safety requirements
• Upstream and downstream system operations

2. Do You Have Any Questions?

It's critical to address any questions your manufacturer might have about your spec or requirements. If the manufacturer does not seek clarification, it might be a red flag. Ensure your manufacturer understands your constraints and potential obstacles as thoroughly as you do.

3. Are All Specifications In The Quote?

All your specifications should be detailed in the quote. Miscommunications can occur between sales and manufacturing if details are omitted. Ask essential questions about the quote to avoid misunderstandings and ensure it covers everything you need.

4. Is This Quote Accurate?

A tempting low price might lead to extra costs and frustration later. Clarify the accuracy of the quote, what could cause it to change, and whether testing, delivery, and maintenance are included. Compare quotes carefully, ensuring they cover the same considerations.

5. What Components Do You Use?

If you prefer specific brands of controls or components, check if these are available. Ensure the manufacturer uses off-the-shelf components to avoid difficulties with maintenance, upgrades, and repairs later.

6. Who Can I Call About This System?

Ask for references who use similar systems. Ensure the manufacturer can provide contacts who can share their experience. Relevant questions include system and process details, any problems encountered, and whether the purchase price matched the quote.

• What system and process do you have?
• When did you purchase it?
• Have you seen any problems?
• Was the purchase price the same as the quote?
• Did the manufacturer provide maintenance or assistance?
• Was delivery on time?
• After purchase, was the manufacturer easy to get in touch with?

7. What Testing Do You Provide?

Testing ensures your system integrates properly and operates without issues. Factory approval testing should be available before shipping. The manufacturer should conduct ingredient testing to address potential problems with bulk density, angle of repose, particle size, material hazards, and more.

Inquire when they conducted such testing previously, the costs involved, and whether it's included in the quote.

8. Are You Certified?

Verify that your manufacturer holds necessary certifications and adheres to standards. This prevents issues later on and ensures your equipment meets required criteria.

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• UL wiring and control standards
• ASME and/or AWS welding standards and codes
• ISO standards
• OSHA equipment safety standards
• IEEE standards
• Canadian, European Union, other international standards

9. What Service Do You Offer?

Inquire about the service department to ensure reliable post-purchase support. Confirm if they have an in-house service team, the number of technicians, and whether they offer setup and training. Investing in robust service support can prevent costly downtime later.

10. Can I Purchase Wear Parts?

Identify parts that may wear out over time, such as sprockets, nozzles, belts, screens, strainers, and calibration components. Addressing these concerns at the purchase stage can minimize future downtime.

11. Will This System Age Well?

Consider the system's adaptability to changing regulations, new technologies, or ingredient changes. Check if the system can accommodate stricter sanitation and safety requirements, more precise measurements, and new software capabilities.

• Stricter sanitation requirements
• Stricter safety requirements
• More precise measurements
• Changes to ingredient mixing
• Additional nutrient needs
• New software capabilities
• IoT integration

Planning is critical to success. Once you confirm your manufacturer can build the necessary system, the most challenging and risky part is over. Ask the right questions from the start to ensure confidence in your system upon arrival.

Having trouble finding a manufacturer to make your product for your exact system? Contact us today to explore how we can assist you.

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