Standard Interpretations - (Archived) Table of Contents|
| Standard Number:||1910.179|
September 17, 1990
|TO:||JOHN MILES REGIONAL ADMINISTRATOR|
|THROUGH:||LEO CAREY, DIRECTOR|
OFFICE of FIELD PROGRAMS
|FROM:||PATRICIA K. CLARK DIRECTOR DESIGNATE|
DIRECTORATE OF COMPLIANCE PROGRAMS
|SUBJECT:||Request for National Office Interpretation of ANSI B30.11 as it Relates to Yale KEL 2-ton chain hoists|
Your December 1, 1989 memorandum to Leo Carey, Director, Office of Field Programs, has been referred to this office for response. We apologize for the delay.
Your memorandum requests a National Office interpretation regarding the Occupational Safety and Health Administration's (OSHA) position with respect to the applicability of ANSI standard B30.11 to Yale KEL 2-ton chain hoists in which the load limiting clutch also acts as an upper limit travel stop device.
Following is the National Office position on this matter: Section 11-1.10 of ASME/ANSI B30.11-1988 which addresses manual or powered hoists units used as part of a monorail or underhung crane system, shall comply with requirements as stated in ASME/ANSI B30.16-1987 (copy enclosed).
ASME/ANSI B30.16-1987, in its Chapter 16-1 Section 16-1.2.1(f), specifies that electric chain hoists are governed by the requirements of ASME/ANSI HST-1 M-1989 (copy enclosed).
HST-1 M 1989 Section 3.8 requires that electric chain hoists be equipped with a top stop device. The last paragraph of Section 3.9 of HST-1-M1989 requires that the overload limiting device on electric chain hoists "shall not be used to sense the overload imposed by a constrained load".
The use of the overload limiting device as a top stop when the hook bottoms on the case, imposing an overload of 175% is interpreted to be a constrained load and, as such, is forbidden by the standard.
If you need additional assistance, please contact us again.
|Standard Interpretations - (Archived) Table of Contents|