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General Course Information for PMTX 1033X: Mixed Gas Diving

Course: PMTX 1033X - Mixed Gas Diving
Textbook: For the correct edition of the textbook assigned to a specific class, go to:

Course Prerequisite(s):
Course Description:

Theory of helium-oxygen commercial diving, practical applications of mixed gas diving used in various commercial diving operations, surface supply helium-oxygen diving, bell diving, advanced thermal protection, saturation diving theory, and theory of splitting and mixing of gases.

Course Learning Outcomes:
  • Describe the theory and historical events leading to the development of helium-oxygen diving and various modes of operational mixed gas diving for closed and open bell diving.
  • Explain the theory and concepts of mixed gas diving and to compute gas formulas related to mixed gas diving
  • Apply basic gas laws (Boyle's Law, Charles/Gay-Lussic's Law, General Gas Law, and Daltons Law) to solve mixed gas formulas for helium-oxygen diving.
  • Calculate diver breathing gas requirements, gas consumption rates, bailout requirements, and gas diving systems gas needs for mixed gas diving.
  • Demonstrate the ability to select a decompression table for surface supply and bell diving and to calculate the partial pressure of various gas percentages, solve max depth, cutoff depth, and effective atmospheres for helium-oxygen dives.
  • Select proper decompression tables and schedules using the U.S. Navy HeO2 Decompression Tables; to decompress divers using in-water decompression, in-water oxygen decompression, surface decompression, and the various emergency procedures related to decompression procedures.
  • Explain how to resolve omitted decompression issues during decompression, surface intervals, or during chamber surface decompression.
  • Explain the concepts and theory of saturation diving and the concept of closed circuit, semi-closed circuit, umbilical supply, and emergency bailout supply.
  • List and describe the support systems needed to support a saturation and/or closed bell diving systems.
  • Explain the various methods of carbon dioxide scrubbers and safe handling of CO2 adsorbent.
  • Demonstrate the ability to use the saturation unlimited excursion tables and to properly conduct saturation compression, excursions, and decompression.
  • Describe the procedures for selection and analysis of deck decompression chamber and bell atmospheres and fire zone precautions and calculations.
  • Describe the medical problems associated with deep diving including: thermal considerations, high pressure nervous syndrome, caustic canister floodout, oxygen toxicity (CNS and Pulmonary), and decompression sickness.
  • Demonstrate the ability to analyze gases used in diving and to determine safe limits.
  • Explain the various methods of thermal protection for diving and to safely use the various suits and hot water support equipment.
  • Demonstrate the ability to dive using mixed gas and to shift gas breathing media during decompression.

Students with Disabilities:
Students seeking special accommodations due to a disability must submit an application with supporting documentation, as explained under this subject heading in the General Catalog. Instructors are required to provide such accommodations if they receive written notification from the University.

Writing Across the Curriculum:
Students are expected to demonstrate writing skills in describing, analyzing and evaluating ideas and experiences. Written reports and research papers must follow specific standards regarding citations of an author's work within the text and references at the end of the paper. Students are encouraged to use the services of the University's Writing Center when preparing materials.

The following website provides information on APA, MLA, and other writing and citation styles that may be required for term papers and the like:

National University Library:
National University Library supports academic rigor and student academic success by providing access to scholarly books and journals both electronically and in hard copy. Print materials may be accessed at the Library in San Diego or through document delivery for online and regional students. Librarians are available to provide training, reference assistance, and mentoring at the San Diego Library and virtually for online or regional students. Please take advantage of Library resources:


Contact the Library:

  • (858) 541-7900 (direct line)
  • 1-866-NU ACCESS x7900 (toll free)

Use the Library Training Tools (on the Library Homepage) for additional help

  • Recorded class presentations
  • Tutorials & Guides (APA/MLA, Peer-Review, and more)

Plagiarism is the presentation of someone else's ideas or work as one's own. Students must give credit for any information that is not either the result of original research or common knowledge. If a student borrows ideas or information from another author, he/she must acknowledge the author in the body of the text and on the reference page. Students found plagiarizing are subject to the penalties outlined in the Policies and Procedures section of the University Catalog, which may include a failing grade for the work in question or for the entire course. The following is one of many websites that provide helpful information concerning plagiarism for both students and faculty:

Ethical behavior in the classroom is required of every student. The course will identify ethical policies and practices relevant to course topics.

Students are expected to be competent in using current technology appropriate for this discipline. Such technology may include word processing, spreadsheet, and presentation software. Use of the internet and e-mail may also be required.

Learning to work with and value diversity is essential in every class. Students are expected to exhibit an appreciation for multinational and gender diversity in the classroom.

As a diverse community of learners, students must strive to work together in a setting of civility, tolerance, and respect for each other and for the instructor. Rules of classroom behavior (which apply to online as well as onsite courses) include but are not limited to the following:

  • Conflicting opinions among members of a class are to be respected and responded to in a professional manner.
  • Side conversations or other distracting behaviors are not to be engaged in during lectures, class discussions or presentations
  • There are to be no offensive comments, language, or gestures