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Standby rescue personnel for sour crude oil tank gauging

Summary An oil company asked OSHA to revisit a prior interpretation requiring two standby people for open hatch gauging of sour crude tanks in immediately dangerous atmospheres. OSHA said it had reexamined the issue and that one standby person with suitable rescue equipment was adequate for each gauging operation when the worker used a self-contained breathing apparatus.
Document
Federal opinion letter
Agency
Occupational Safety and Health Administration (OSHA)
Document number
1990-06-11
Date issued
June 11, 1990
Status
Active
Status last verified October 9, 2026

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About this page: The full text below is the official document from Occupational Safety and Health Administration (OSHA). Ezel adds the plain-English summary and tracks the document's status. The official source linked on this page is authoritative for any reliance.

June 11, 1990

M. E. McAllister, Ph.D.
Manager - Environmental, Safety
& Regulatory Compliance
TOTAL Minatome Corporation
[Recipient address omitted]
Dear Dr. McAllister:

Thank you for your letter of April 2, regarding an interpretation of respirator rules as applied to open hatch gauging of sour crude oil storage tanks. I apologize for the delay in responding to your inquiry.

As you indicated in your letter, the Occupational Safety and Health Administration (OSHA) has reexamined its position on the number of standby persons required when open hatch gauging of sour crude oil storage tanks is performed in atmospheres immediately dangerous to life and health (IDLH) when self-contained breathing apparatus is used for protection. OSHA has concluded that for each gauging operation one standby person with suitable rescue equipment is adequate.

I appreciate the opportunity to clarify this matter for you.

Sincerely,

Patricia K. Clark Director
Designate Directorate of Compliance Programs

[Requester letter reproduced on OSHA page; omitted here.]

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