Crush loads are normally measured using number of standing passengers per 1 square metre (1.2 sq yd). Six passengers per square metre is often considered the practical limit on what can be accepted without serious discomfort to passengers. However, severe crush loads can be much in excess of this.
What is a crush load in transportation?
A crush load is a level of passenger loading in a transport vehicle which is so high that passengers are "crushed" against one another. It represents an extreme form of passenger loading, and normally considered to be representative of a system with serious capacity limitations.
What is the capacity of a stone crusher?
The capacities are based on the crusher receiving full, continuous feed of clean, dry, friable stone weighing 100 lb/cu ft. These capacity tables show several significant differences between the two common types of primary crushers.
How is the crush performance of a cable specified?
Siecor uses the first method to specify crush performance because we believe it is the most practical method of the three. By measuring the attenuation while the cable is under compressive load, the user will know how much attenuation the cable will exhibit if a compressive force is applied while the cable is in service.
What is the meaning of super dense crush load?
Definition. In India, the term "super dense crush load" "Super-Dense Crushload" has been coined by railway officials to describe passenger loads on peak-hour trains operating on the Mumbai Suburban Railway when carriages built for 200 passengers carry over 500, translating to 14–16 people per square metre.
What is the difference between a jaw crusher and a gyratory crusher?
These capacity tables show several significant differences between the two common types of primary crushers. A jaw crusher has a wider range of settings—generally, a maximum of two to three times the smallest setting . The tables also show that for a comparable maximum size of feed and setting, a gyratory crusher has a much greater capacity than a jaw crusher. The gyratory crusher obtains this advantage only at the cost of greater power to drive the crusher.
How much dipper capacity for a 60 in gyratory crusher?
gyratory crusher is to process material from a quarry where a shovel loads the raw material, the shovel would probably have to have a dipper capacity of at least 5 cu yd to be compatible. It may be more economical to change the blasting pattern to produce larger rock that can be handled by a larger loader-hauler combination and still fit in the primary crusher. Generally, a large reduction ratio will be required of the primary crusher.
What is the economic selection of a crusher?
The economic selection of any particular crush er depends on the ability of the crusher to handle the maximum size of feed, reducing this at the highest possible reduction ratio and least cost for the original installation, maintenance, and power. For any particular aggregate production plant, it is advisable to make preliminary determinations of the types of crushers needed. If most of the feed is coarse and stage crushing is required, primary crushers that meet the requirements of reduction and economy and have straight crushing surfaces may be most economical.
Which has more capacity, a gyratory or a jaw crusher?
The tables also show that for a comparable maximum size of feed and setting, a gyratory crusher has a much greater capacity than a jaw crusher. The gyratory crusher obtains this advantage only at the cost of greater power to drive the crusher.
How to convert to mass per hour?
The denominator looks wrong; to convert to mass per hour should be multiplying by 60, not dividing by 60. Dividing by 60 should give mass. per second, which isn’t what you want. The example you’ve given is missing information needed to calculate the “A” term – it doesn’t tell you the height of the crushing chamber.
Is it advisable to use nonchoking crushing surfaces in a high capacity crusher?
Where only a very small percentage of the feed approaches the size of the feed opening of the crusher, nonchoking crushing surfaces in a high capacity crusher may be advisable for the sake of economy. If the plant requires several stages, and several different types of crushers could be used for each stage, the costs of each feasible combination must be analyzed to find the crusher plant with the least total cost.
Can you feed gravel into a primary crusher?
If gravel has relatively small maximum particle sizes , a large feed opening is not needed. It may be more economical to feed all of the pit-run material into the primary crusher rather than to remove the part that is already smaller than the crusher setting. That calls for a crusher with a higher capacity.
What happens if one manufacturer uses option 1 and another uses option 3?
If one manufacturer uses option 1 and another uses option 3, then the customer cannot make an "apples to apples" comparison. Furthermore, a very high load specification with option 3, for example, does not necessarily indicate a more robust cable than would a lower-load level with option 1. So what is the best way for users to know ...
What is FOTP 41?
But FOTP-41 is only a test procedure and does not specify all the necessary information for performing the test and for determining the pass/fail criteria. It shows how to set up and perform the test but leaves the actual test-level determination to the user.
What force can a cable be subjected to?
The manufacturer can subject the cable to: an industry-standard compression force and measure the attenuation while the cable is under load and after the load is removed. any compressive load and measure only the attenuation after the load is removed. any compressive load and measure only the continuity of the fiber.
What is crush performance?
Crush performance is one of the primary mechanical characteristics that are routinely tested and specified by optical-fiber cable manufacturers. Crush testing determines the ability of an optical-fiber cable to withstand and/or recover from the effects of a compressive force. Although there is an industry-standard test method, ...
Does Siecor use crush performance?
any compressive load and measure only the continuity of the fiber. Siecor uses the first method to specify crush performance because we believe it is the most practical method of the three. By measuring the attenuation while the cable is under compressive load, the user will know how much attenuation the cable will exhibit if a compressive force is ...
How do you know if a corrugated box is strong?
The strength of a corrugated box starts with its material. A box’s strength is relative to its density. The more walls a box has, the stronger it will be. The manufacturer’s stamp inside the box usually states single wall, double wall, or triple wall to let you know the strength of the box.
Why are corrugated boxes not the same?
Because all corrugated boxes are not made the same, the outer and inner dimensions may vary , meaning that the weight the box is able to carry can also vary. Calculating the box size also allows businesses to make informed decisions about logistics and supply chain management, but box size will not affect the strength of the box overall.
What is corrugated box?
Corrugated boxes are made of three different layers of paper: an inside liner, an outside liner and fluting which runs in between.
What is the purpose of flutes in corrugated boxes?
The flutes between the layers of liners give strength and structure to corrugated boxes and provide an extra layer of protection . This corrugated method, also known as containerboard, ultimately helps provide the strength needed to hold weight and protect the product inside. The strength of a corrugated box starts with its material.
What is the edge crush test for corrugated boxes?
For boxes of all sizes, calculating the weight that can be held by the corrugation is done by something called the edge-crush test (ECT). “ECT is a measure of the compressive strength of corrugated board.
How many styles of corrugated boxes are there?
There are 30-plus styles of corrugated boxes. From basic Regular Slotted Containers (RSC) to self-erecting boxes to retail floor displays, we have the corrugated box you need. We’ll combine our experience with your box needs and budget to satisfy your corrugated application.
