What Factors Affect Cost in Seismic Springs?

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What Factors Affect Cost in Seismic Springs

Are you considering having seismic springs installed to reduce vibrations in your pump, but struggling to find information on the potential cost?  There are many factors that can affect things like quality, durability, and especially cost – and that means that you may want to research all options and influencing factors before you decide what to do next.

Our team at Masterflow have over 20 years of expertise in the HVAC industry – providing high-quality products and services in Australia. Our engineers have provided their insight on the potential cost influences on seismic springs and the details customers should be aware of when discussing installing seismic springs with a distributor. We are here to answer questions you may have – we understand the importance of honest information when making a buying decision.

After reading this article, you will know more about all the different factors which may increase or decrease the final cost of your seismic spring.

Seismic springs are equipment which is engineered to meet HVAC requirements to be used in industries which require industrial and commercial applications such as chillers, motors, cooling towers, compressors, air conditioners and more. These seismic isolators limit lateral and vertical movement and are excellent at reducing vibration and noise in applications. Seismic spring mounts provide control of the transmission of noise and vibration with little movement. This equipment provides protection to industrial and commercial applications if they are ever subjected to the excessive movement (such as an earthquake).

Seismic springs are ideal for pumps as they have increased static deflection and therefore greater isolation efficiency. If your equipment requires horizontal or vertical restraint, seismic springs may be a solution to the reduction of noise and vibration. Spring mounts vary in range depending on maximum load and deflection and the level of isolation can be selected accurately for your application. Seismic springs are essentially customized to match the requirements of the client’s equipment.

Contact us if you want to know more about selecting the right seismic springs for your application.

Factors That Increase The Cost of Seismic Springs

Weight Can Affect Cost of Seismic Springs

The heavier the pumpset the larger the individual spring mounts- The weight of the pumpset can affect the cost of seismic spring mounts and can be a factor that increases overall costs. The reason for this is that the heavier the pumpset, the larger the individual spring mounts will be. You can contact a contractor to discuss how the weight of your pumpset might affect the cost to get an accurate idea of the size of the spring mounts you would need for your application.

 

Quantity

The quantity of the seismic springs needed for your application may also be a factor that increases the cost. Depending on how many point loadings are required, you may need a larger or smaller number of seismic springs. Condenser water and chilled water pump sets which are larger than 110kw, or larger chillers, will require more point loads than smaller mechanical equipment. This can then lead to increase in costs as you will need to purchase more seismic springs to match the requirements of your existing equipment.

Deflection Can Increase Cost of Seismic Springs

Deflection can be a factor that increases the cost of seismic springs. If specified, 50mm deflection will always make the seismic springs more expensive. Sometimes a design engineer may request 50mm Deflection Springs to be supplied with mechanical equipment. They do that because they add on the amount that the slab could bend to the normal 25mm deflection.

On the ground floor, the 25mm deflection spring will suffice – however, on a raised floor, the slab may have 10 metres between support columns and the slab can bend or deflect by 27mm between the columns if heavy machinery is placed in the middle. A 50mm deflection spring will be required to accommodate this additional deflection. These springs with high deflection capacity will always be bigger and therefore more expensive that the normal 25mm deflection.

This is because springs have the same operating height as their diameter. The ratio between loaded height and diameter needs to be 1:1 to make them laterally very stiff. For example, 50mm deflection needs to have a spring that is 130mm in diameter, which is much bigger than the 25mm deflection spring.

Retrofitting Can Increase Cost of Seismic Springs

Retrofitting is a technique used to strengthen existing structures and is often required in buildings which are commonly subjected to seismic activity like large industrial or commercial buildings.  Having seismic springs retrofitted can be very expensive so it is advisable to make suitable enquiries with a head contractor so he may review the specifications carefully and determine if the site requires seismic restraints.

Pump manufacturers will commonly supply a baseplate that has an outrigger to suit standard springs which leads to a shorter outrigger. A shorter outrigger is difficult to change to a seismic configuration.

Furthermore, if and when seismic events occur and the requirements for damage control have not been met with the appropriate equipment, this can lead to great expenses caused by damaged pipes and water infrastructure. Seismic risk must be assessed and adherence to construction codes must be put in place to reduce potential damages and costs.

Factors That Decrease Cost in Seismic Springs

Just as there are many factors that can increase the costs of the seismic springs you choose for your equipment, there are many factors that can lead to decreased prices.

Choosing Standard Spring Arrangements Can Decrease Cost

Seismic restraints are not required for pumps in all sites. This can be a factor which may decrease the cost as you will be able to get the required vibration control from a standard spring arrangement. It should be noted that you should speak with a professional contractor for further information on choosing the right seismic restraints for your equipment as you will be able to use standard spring arrangements with your equipment and this will save you costs.

Cost may work out as less if you choose standard springs as these are always less expensive. Standard springs consist of a spring housed in a floor-mounted retainer made of rubber and a top retainer which includes the adjusting bolt. These springs have no additional mounted bracketing that anchors the spring as does the seismic arrangement.

Flexible mounting devices (such as spring mountings) are used, they shall be fitted with restraining devices to limit the horizontal and vertical motions, inhibit the development of resonance in the flexible mounting system and prevent overturning.

Deflection Can Decrease Cost of Seismic Springs

Deflection is another factor that affects the price of seismic springs. The standard 25mm deflection will be less expensive. These springs with a lower deflection capacity will always be smaller and therefore will not cost as much as if you needed a 50mm deflection as discussed above.

Do you still want to learn more?

You have now learned all about the different factors which can affect the cost of seismic springs. We hope that you feel more informed and that this helps you out in your next step. If you have any questions or comments on any of the information we have provided – don’t hesitate to reach out. We would love to hear from you. Call us today to discuss your needs and speak to one of our experts about the options available for your project.

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