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What is the difference between tie rod and limit rod?

The function of tie rods on an expansion joint is to continuously restrain the full pressure thrust during normal operation while permitting only lateral deflection. Limit rods are used to limit axial expansion or compression. Limit rods are designed to absorb the pressure thrust of the expansion joint in case of anchor failure.

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What is flow rate?

The flow rate is the amount of liquid passing through a particular area over a period of time. It is generally measured in gallons per a minute or cubic feet per meter.

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What is angular deflection?

When an expansion joint experiences bending about its center, which is on the centerline and halfway between the ends of the bellows, this deflection is referred to as angular. It can occur in any plane that passes through the centerline, but the plane should be clearly indicated if the expansion joint is more complicated than the simplest type, i.e., only a bellows with flanges or pipe ends. As in lateral movements, piping analyses may reveal angular deflections occurring in more than one plane. With angular deflection the basis for the proper selection is the maximum of the various deflections, and not the vector sum as in the lateral case. Multiple angular deflections in multiple planes produce a single angular deflection in a single resultant plane. As in lateral deflection, this plane must be understood if structural components are to be used.

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What is an FCC unit?

An FCC unit is a fluid catalytic cracking unit, which is a type of process that is used in refining crude oil into gasoline. The expansion joints used for the service are called stand pipe expansion joints.

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What is an expansion joint?

An expansion joint is an assembly used in a pipe line to allow it to expand and contract as climate conditions move from hot to cold and helps to ensure that the system remains functional.

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What is 300 psig?

This is an expansion joint specification meaning the expansion joint is rated for 300 pounds per square inch of pressure.

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