1 / 14

HVACR316 - Piping

HVACR316 - Piping. Related Codes II Trade Math II. Related Codes. Liquid Receivers – All systems containing 100 pounds or more of a refrigerant, other than systems using non-positive displacement compressors, shall have stop valves. Related Codes.

geraldine-travis
Download Presentation

HVACR316 - Piping

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. HVACR316 - Piping Related Codes II Trade Math II

  2. Related Codes • Liquid Receivers – All systems containing 100 pounds or more of a refrigerant, other than systems using non-positive displacement compressors, shall have stop valves.

  3. Related Codes • Stop valves shall not be required on the inlet of a receiver in a condensing unit nor on the inlet of a receiver which is an essential part of the condenser.

  4. Related Codes • Copper Tubing – Stop valves used with soft annealed copper tubing or hard drawn copper tubing 7/8 inch O.D. standard size or smaller shall be securely mounted, independent of tubing fastenings or supports.

  5. Related Codes • Identification – Stop valves shall be identified where their intended purpose is not obvious. Numbers shall not be used to label the valves, unless a key to the numbers is located near the valves.

  6. Trade Math • Multiplication is a short cut method of obtaining the answer to a problem involving the repeated addition of the same number, The symbol used to indicate that the problem is to be solved by multiplication is the “times” symbol, or an X. • An example follows.

  7. Trade Math • 3 X 4 is the problem. We could add 4 + 4 + 4 to get the answer of 12, but multiplication is another way. 12 • In the above example, 4 is the multiplicand, or the number that is added to itself to get the answer. The multiplier is 3, or the number of times 4 is multiplied to arrive at the answer. • The number 12 is the product, or answer.

  8. Trade Math • In multiplication, every digit in the multiplicand is multiplied by every digit in the multiplier. When the number obtained by multiplying is greater than 9 (a single-digit number), the second digit is carried over to the next column. Therefore, 2 x 9 = 18, where 18 is the two-digit answer to the multiplication question.

  9. Trade Math • A multiplication problem may be checked by multiplying the numbers in reverse order. 20 2 X 2 X 20 40 40

  10. Trade Math Sample Questions Solve the Following Problems: 1.A power hacksaw operates at 140 strokes per minute. How many strokes does it make in 25 minutes? 2. A circular power saw will rip a 10 foot board in 5 seconds. How long will it take to cut rip fourteen 10 foot boards?

  11. Trade Math 3. A electrician used 2432 inches of wire to wrap a coil. How much wire would he need to wrap 15 such coils? 4. In a drafting class, each person was issued 12 inches of drafting tape. If the class is made up of 18 people how many inches of tape were issued?

  12. Trade Math 5. There are 5280 ft. in a mile. How many feet are in 512 miles? 6. The shipping weight of 12 electric welders is 355 lbs. each. What is the total shipping weight?

  13. Trade Math 7. How many inches of steel bar are required to cut 32 pieces, each 16 inches long? Disregard the amount lost in cutting. 8.A cabinet shop has 12 two foot bar clamps which weigh 7 lbs. each. 9 three foot, weighing 8 lbs. each, 14 four foot weighing 9 lbs. each and 18 six foot weighing 12 lbs. each. What is the total weight of all the bar clamps?

  14. Trade Math Answers: 1. 3500 2. 70 seconds, or 1 minute 10 seconds 3. 36,480 4. 216 5.2,703,360 6. 4260 lbs 7.512 inches 8. 498 lbs

More Related