Navy NEC · Engineering

741B High and Low Pressure Cryogenic Technician

Current service use not established

This code is listed in the directory. Inclusion alone does not confirm current service use.

A Navy Enlisted Classification: a skill designation sailors hold in addition to their rating.

Overview

A High and Low Pressure Cryogenic Technician operates generating plants to manufacture liquid oxygen and liquid nitrogen under varying climatic conditions. This technician tests product purity, checks compressed gas cylinders, maintains refrigeration and compression equipment, corrects abnormal operating conditions, and documents corrective maintenance.

Core Skills

  • Liquid oxygen and nitrogen purity testing
  • Compressed gas cylinder inspection and charging
  • Compressor, refrigeration, and vacuum pump maintenance
  • Oxygen and nitrogen plant fault diagnosis

Civilian Career Paths

Career associations are editorial assessments of the cited evidence, not an official crosswalk unless the evidence explicitly says so. O*NET supplies civilian occupation information, not proof of a military match. Related experience does not confer civilian qualifications. Tasks and tools below describe civilian work, not military training.

Gas Plant Operators

Operating liquid oxygen and nitrogen plants, maintaining compressors and refrigeration systems, and correcting plant abnormalities transfer directly to gas-processing equipment operation and monitoring.

How to prepare: Seek supervised operator training on the target plant's gas-processing controls, with emphasis on natural-gas liquefaction and regasification where those processes differ from oxygen and nitrogen production.

What the civilian work involves
  • Monitor equipment functioning, observe temperature, level, and flow gauges, and perform regular unit checks to ensure that all equipment is operating as it should.
  • Control operation of compressors, scrubbers, evaporators, and refrigeration equipment to liquefy, compress, or regasify natural gas.
  • Record, review, and compile operations records, test results, and gauge readings such as temperatures, pressures, concentrations, and flows.
Civilian tools and software (examples)
  • Microsoft Excel

Notes & Sources

Evidence for this guidance (2 documents)
  1. NAVPERS 18068F Vol II (NEOCS, Jul 2026 edition): NEC 741B

    [1] NEC entry "741B - High and Low Pressure Cryogenic Technician"; cached text line 17625; NAVPERS 18068F Vol II, 2026-07 edition

    Supports: Liquid oxygen and nitrogen purity testing, Compressed gas cylinder inspection and charging, Compressor, refrigeration, and vacuum pump maintenance, Oxygen and nitrogen plant fault diagnosis, Gas Plant Operators (O*NET 51-8092.00)

  2. O*NET: Gas Plant Operators

    [2] O*NET 30.3 occupational data

    Supports: Gas Plant Operators (O*NET 51-8092.00)

Defense contractor jobs for 741B

Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.

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