Blending theory
This presentation is the property of its rightful owner.
Sponsored Links
1 / 13

Blending Theory PowerPoint PPT Presentation


  • 104 Views
  • Uploaded on
  • Presentation posted in: General

Blending Theory. Introduction. Requirements Basics – empty cylinder Basics – partially empty cylinder Calculations Mixing Chart. Requirements. Decide method Assemble equipment Check suitability Need to know: What have in cylinder What want in cylinder What is final mix in cylinder

Download Presentation

Blending Theory

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Blending theory

Blending Theory


Introduction

Introduction

  • Requirements

  • Basics – empty cylinder

  • Basics – partially empty cylinder

  • Calculations

  • Mixing Chart


Requirements

Requirements

  • Decide method

  • Assemble equipment

  • Check suitability

  • Need to know:

    • What have in cylinder

    • What want in cylinder

    • What is final mix in cylinder

      ANALYSE – ANALYSE - ANALYSE


Empty cylinder

Empty Cylinder

  • Have: Empty Cylinder

  • Want: EAN32 to WP 230 bar

  • How much oxygen?

    0.32 x 230 = 73.6 bar O2 in final mix

  • Top up with air (pPO2 = 0.21)

  • Calculate O2 content in air top up

  • Use formula


Formula

Formula

  • To account for top up:

    Final mix FO2 - Top up FO2 x Fill Pressure

    Top up FN2

    0.32 - 0.21x 230 0.79

    = 32 bar oxygen plus 198 bar of air


Calculation

Calculation

  • Check calculation:

    32 bar oxygen = 1.0 x 32 = 32

    198 bar air = 0.21 x 198 = 41.6

    Total oxygen in EAN32 @230 bar

    32 + 41.6 = 73.6 bar oxygen

  • Use formula for any top gas

  • Analyse to check mix


Partially full cylinder

Partially Full Cylinder

  • Contains air – same as empty

  • Contains nitrox mix – empty or analyse

  • Find oxygen remaining in cylinder

  • Subtract from required oxygen


Calculation1

Calculation

  • Have EAN34 @70 bar

    0.34 x 70 = 23.8 bar O2

  • Want EAN32 @ 230 bar

    0.32 x 230 = 73.6 bar O2

  • O2 wanted 73.6 – 23.8 = 49.8 bar

  • Fill pressure 230 – 70 = 160 bar

  • Require 49.8 bar O2 in 160 bar


Calculation2

Calculation

  • Work out FO2 - use pressure ‘T’

    49.8 = 0.311

    160

  • Use top up formula

    0.311 - 0.21x 160

    0.79

    = 20.5 bar O2

  • Top up with 139.5 bar air


Calculation check

Calculation – check

  • Check calculation

    EAN34 @ 70 bar = 23.8

    Add 20.5 bar O2 = 20.5

    Air @139.5 bar = 29.3

    Total = 73.6 bar O2

    Want EAN32 @ 230 bar = 73.6 bar O2


Mixing chart

Mixing Chart

  • Mixing chart – Appendix 1

  • Oxygen in mix for pPO2 and fill pressure

  • Use to calculate O2 needed

  • Use to calculate O2 left in cylinder

  • Accounts for O2 in air for top up

  • Removes errors in calculation


Summary

Summary

We have covered:

  • Requirements

  • Basics – empty cylinder

  • Basics – partially empty cylinder

  • Calculations

  • Mixing chart


Questions

Questions?


  • Login