Photo taken by Janelle Gardiner, September 15, 2014. |
This tank time formula will be helpful in your calculations.
The following steps are provided to guide you in obtaining the information necessary to provide both the nurse and the patient with the information needed.
- Identify the tank factor for the size cylinder being used. To simplify, use a tank factor of 0.28 for an E cylinder, and 3.14 for an H cylinder. For a more complete listing of tank factors, please refer to Table 37-4 in Egan's Fundamentals of Respiratory Care (Kacmarek, Stoller, & Heuer, 2013).
- Note the liter flow for the particular scenario.
- Assume a full cylinder contains 2200 psig.
- Insert know figures into the formula. Tank factor * psig in cylinder.
- Divide the result of step 4 by the liter flow as noted in step 2. This will give you the number of minutes the cylinder will last at the specified liter flow and pressure (psi) remaining in the cylinder.
- Divide the result of step 5 by 60 to determine the number of hours and minutes one cylinder will last.
Photo taken by Janelle Gardiner |
Beyond Tank Time
For the patient to be completely prepared for discharge, they will need to know other things in addition to time intervals at which to change tanks. Comment on what other patient education you could provide at the time of discharge. What arrangements need to made in Boise? Are there other ancillary services that need to be involved in discharge planning?
Recommendations for teaching tank time calculations:
- Provide the students with some relevant scenarios similar to the one provided above. The scenarios can be for in-hospital transport, inter-hospital transport, or discharge for home use. For optimal learning, the student should be able to find clinical relevance in the scenarios provided.
- Discuss with students the format for finding a similar scenario on the National Board for Respiratory Care (NBRC) Certified Respiratory Therapist exam. Help the student understand that all questions will be asked in a multiple choice format. The students must be able to perform these calculations without the use of a calculator, as the NBRC does not allow the student to use a calculator on the exam. Therefore, you may suggest they can use a tank factor of three for an H cylinder, and 0.3 for an E cylinder to simply the calculations. Historically, multiple choice responses are far enough apart from each other that these types of estimations can be made to arrive at the correct answer.
Kacmerek, R. M., Stoller, J.
K., & Heuer, A. J. (Eds.). (2013). Egan’s fundamentals of
respiratory care (10th ed.). St. Louis, Missouri:
Elsevier.
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