QTP4B071-8 — Confined Spaces

QTP4B071-8 governs confined space classification, atmospheric monitoring, combustible gas meter operation, and entry plan and permit approval.

Search QTP4B071-8

  • Publication number: QTP4B071-8
  • Title: Confined Spaces
  • Date: 2024-03-07

View QTP4B071-8 on armypubs.army.mil


It covers MSA Passport and Sirius detector checks, calibration, gas concentration measurement, and data recording. It also contains training and certification tasks for confined space testing and reviews of master entry plans and non-routine permits.

Topics covered

  • Confined space classification
  • Atmospheric monitoring
  • Combustible gas meters
  • MSA Sirius Multigas Detector operation
  • Instrument calibration
  • Confined space tester certification
  • Master entry plans
  • Non-routine entry permits

Questions and answers

What determines whether an area is classified as a confined space?

(1) Is large enough and so configured that an employee can bodily enter and perform assigned work. (2) Has limited or restricted means for entry or exit (for example, tanks, vessels, silos, storage bins, hoppers, vaults, and pits are spaces that may have limited means of entry.); and (3) Is not designed for continuous employee occupancy. (paragraph 1)

How long must a completed entry permit be retained?

Each completed entry permit, including those canceled or revoked, shall be retained for one year by the organization responsible for the entry and be available for review. (paragraph 2)

What does the TWA alarm calculation use?

The TWA alarm is calculated over an eight-hour exposure. (paragraph 4)

What is required before using Fresh Air Setup?

Warning: Do not activate the Fresh Air Setup unless you are certain you are in fresh, uncontaminated air; otherwise, inaccurate readings can occur which can falsely indicate that a hazardous atmosphere is safe. (paragraph 2)

How often is local training on atmospheric monitoring equipment provided?

AFI 91-203, Air Force Consolidated Occupational Safety Instruction, Chapter 23, para 23.2.4.3 states that BE will provide local training on the use, calibration (user) and care of atmosphere testing and monitoring equipment annually. (paragraph 1)

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