Please support our efforts by becoming a member. We hope to be able to create more free tools as our membership base grows. If you are an inspector, superintendent or foreman you can take a few minutes with the installer to educate them on what is required, show them the calculator and have them save it on their smartphones home screen now and have confidence that the calculations are being done correctly. Becuase the insufficiently compressed mineral wool provides less resistance to heat conduction, thus leading to the same undesirable result as having a mineral wool with too low of a density. I will be there, and hopefully you will too Also, there will be two European conferences this year. Attend HHC 2022, the annual HP calculator conference, in Nashville, TN, USA, September 10-11.
You input a couple of simple numbers and the calculator will spit out how much un-compressed mineral wool you will need.īefore the firestopping compression calculator, it was not uncommon to see installers simply compress the wool somewhat, giving it a slight friction fit into the joint, and assume it is “close enough”. If you are interested in purchasing HP calculator-related items to help support this site, please see my commerce site. While intended mostly for Jeep engines, itll work just as well for any other engine. This chart shows the final compression ratio by combining the static compression ratio of an engine and the maximum blower boost from the. This calculation is not an easy one for everyone to do, so we created the firestopping compression calculator. Here is a displacement and static/dynamic compression ratio calculator. For instance, a 1-1/2” joint that requires mineral wool as a backing material installed with 33% compression would require 2-1/4” of mineral wool compressed into the 1-1/2” gap. The compression ratio might be calculated incorrectly by the installer, or sometimes even ignored. Compression ratio denotes how much air and fuel mixture that the combustion chamber found in a combustion engine can hold. Not an advertised feature of the door gap gauge but you could use it to measure the joint width required for your fire stopping requirements.Ī common issue associated with mineral wool usage in firestop systems, and often observed during field verifications, is that the compression of the wool specified in the listed system’s installation instructions is sometimes not achieved. If we dig a little deeper to make sure that we are doing the math correctly you will want to reference XHBN UL Guide Specification for Joint Systems and follow the formula that they provide to calculate the required uncompressed thickness of insulation material that needs to be used in your system. Thus, when the 15-inches of material is compressed you would fill the 10-inch edge of slab with the compressed insulation material having a 50% compression. Unlike Static Compression Ratio, Dynamic Compression Ratio takes into account camshaft timing by considering the intake valve closing point in relation to the.
#COMPRESSION CALCULATOR PLUS#
You would think that 50% of 10-inches is 5-inches, so you would add 10-inches plus 5-inches to have an uncompressed thickness of 15-inches. You need a couple of measurements that are not easy to get in order to calculate your. It seems like a simple math calculation right. If you have a joint that is 10-inches wide for an edge of slab stuff and spray and the listing indicates a 50% compression. Have you ever read a UL listing and it requires a 50% or even a 33% compression ratio? What does it mean and how do you calculate it? You can use the firestopping compression calculator below to figure out how much-uncompressed insulation material you will need? Hence the - (negative) number in the calculator.Firestopping Compression Calculator Joint Firestopping insulation material compression calculations per the XHBN UL Guide Specification for Joint Systems. Same goes for a dome where it is positive cc's on the piston but a reduction in cylinder volume. Hence the positive number in the calculator. This seems very confusing but it is because even though it is a -cc on the piston, those same cc's are gained in cylinder volume.
The cc for the piston is entered as a positive number on a -cc Dish or Flat top piston and a negative number on a dome piston.
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