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.

March 8, 1977

Mr. Manford Ruby
Laclode Steel Company
Post Office Box 576
Alton, Illinois 62002

Subject: 1910.179(b)(4) Wind Indicators and Rail Clamps

Dear Mr. Ruby:

Outdoor storage bridges shall be provided with automatic rail clamps. A wind-indicating device shall be provided which will give a visible or audible alarm to the bridge operator at a predetermined wind velocity ...

Section 1910.179(a)(13) The "Storage Bridge Crane" means a Gantry type crane of long span usually used for bulk storage of material; the bridge girders or trusses are rigidly or nonrigidly supported on one or more legs. It may have one or more fixed or hinged cantilever ends.

Section 1910.179(a)(8) defines an overhead crane and (a)(6) "Gantry Crane".

Section 1910.179(b)(4) Wind indicators are only required on outdoor "storage bridges". The standard is concerned with the action that may be created by a wind force above that which it was designed to operate.

The wind indicators are not required on an overhead traveling crane - only on "Gantry" type.

Please feel free to call us at any time. We regret the delay in our response to your telephone call.

Very truly yours,

Acting Assistant Regional
Administrator for Technical Support