Positive identification of persons working underground in tunnels and shafts, caissons, cofferdams, compressed air tunnels.

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov.

November 16, 1977

Mr. Dewey Bowers
Director of Safety
Fruin-Colnon
1706 Olive Street
Saint Louis, Missouri 63103

Dear Mr. Bowers:

This is in response to your letter dated October 14, 1977 concerning positive identification of persons working underground in tunnels and shafts, caissons, cofferdams, and compressed air tunnels. We were pleased to meet with you on October 6, 1977 in order to discuss these matters.

Standards for decompression chambers for use with pressurized face-tunnel boring machines.

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov.

July 23, 2010

Letter #20100303-9658

Re: Standards for decompression chambers for use with pressurized face-tunnel boring machines.

This letter responds to your question of February 9, 2010, to Richard S. Terrill, Administrator of OSHA Region X.

Question:  Are pressure vessels for human occupancy involved in tunnel boring required to be fabricated and documented in accord with the ASME PVHO-1 standard, "Pressure Vessels for Human Occupancy"?

Tully/OHL USA Joint Venture: Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments

  • Publication Date:
  • Publication Type:
  • Fed Register #:
    79:844-853
  • Title:
[Federal Register Volume 79, Number 4 (Tuesday, January 7, 2014)][Notices][Pages 844-853]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2014-00008]


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DEPARTMENT OF LABOR

Occupational Safety and Health Administration

[Docket No.

Tully/OHL USA Joint Venture: Grant of a Permanent Variance

  • Publication Date:
  • Publication Type:
  • Fed Register #:
    79:29809-29819
  • Title:
[Federal Register Volume 79, Number 100 (Friday, May 23, 2014)][Notices][Pages 29809-29819]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2014-12016]


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DEPARTMENT OF LABOR

Occupational Safety and Health Administration

[Docket No.

Traylor/Skanska/Jay Dee Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments

  • Publication Date:
  • Publication Type:
  • Fed Register #:
    79:73631-73641
  • Title:
[Federal Register Volume 79, Number 238 (Thursday, December 11, 2014)][Notices][Pages 73631-73641]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2014-28994]


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DEPARTMENT OF LABOR

Occupational Safety and Health Administration

[Docket No.

Impregilo Healy Parsons Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments

  • Publication Date:
  • Publication Type:
  • Fed Register #:
    80:7636-7646
  • Title:
[Federal Register Volume 80, Number 28 (Wednesday, February 11, 2015)][Notices]
[Pages 7636-7646]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2015-02836]


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DEPARTMENT OF LABOR

Occupational Safety and Health Administration

[Docket No.

Traylor/Skanska/Jay Dee Joint Venture: Grant of a Permanent Variance

  • Publication Date:
  • Publication Type:
  • Fed Register #:
    80:16440-16449
  • Title:
[Federal Register Volume 80, Number 59 (Friday, March 27, 2015)][Notices][Pages 16440-16449]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2015-06975]


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DEPARTMENT OF LABOR

Occupational Safety and Health Administration

[Docket No.

Impregilo Healy Parsons Joint Venture; Grant of a PermanentVariance

  • Publication Date:
  • Publication Type:
  • Fed Register #:
    80:50652-50662
  • Title:
  [Federal Register Volume 80, Number 161 (Thursday, August 20, 2015)]  [Notices]
  [Pages 50652-50662]
  From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
  [FR Doc No: 2015-20571]


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  DEPARTMENT OF LABOR

  Occupational Safety and Health Administration

  [Docket No.

Authorization To Open Dockets of Denied Variance Applications for Public Access

  • Publication Date:
  • Publication Type:
  • Fed Register #:
    81:12969-12972
  • Title:
[Federal Register Volume 81, Number 48 (Friday, March 11, 2016)][Notices][Pages 12969-12972]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2016-05488]


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DEPARTMENT OF LABOR

Occupational Safety and Health Administration

[Docket Nos.

Traylor Bros., Inc.; Grant of a Permanent Variance

  • Publication Date:
  • Publication Type:
  • Fed Register #:
    81:12954-12966
  • Title:
[Federal Register Volume 81, Number 48 (Friday, March 11, 2016)][Notices][Pages 12954-12966]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2016-05485]


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DEPARTMENT OF LABOR

Occupational Safety and Health Administration

[Docket No.