Technical Notes: Drum Freeboard Standards

ANSI A10.5-1992, para. 14.5.1, page 9:
Safety Requirements for Material Hoists
+/= 2 inches
ANSI A10.22-1990, para. 4.9, page 10:
Rope-Guided & Nonguided Worker's Hoists - Safety Requirements
+/= 2 inches

ANSI B30.5a-1990, para. 5-1.3.2 (a)(2)(c):
Mobile & Locomotive Cranes, page 18.

+/= 1/2 inch
ANSI B30.7-1989, para. 7-1.2.2 (c)(3):
Base Mounted Drum Hoists, page 11.
+/= 1/2 inch
ANSI B30.7-1989, para. 7-3.2.2 (g):
Base Mounted Drum Hoists, page 20.
+/= 1/2 inch

American Bureau of Shipping (ABS)
1990 Guide for Cert. of Drilling Systems: para. 5.21.3.1c, page 5-14.

+/= 2 rope dia.

Construction Safety Association of Ontario
1975 Rigging Manual, Condition & size of sheaves & drums, Figure 130, p.18:
- grooved drums
- smooth drums

 

+/= 2 inches (1)
+/= 2.5 inches(2)

Det Norske Veritas (DNV)
1989 Rules for Cert. of Lifting Appliances: Section 5, para. B203, page 33.

+/= 2.5 rope dia.

Norwegian Maritime Directorate
Section 8.1.1:

2.5 rope dia.(3)

Society of Automotive Engineers (SAE)
Rating of Winches
SAE Standard J706-July 85, para. 3.5:

+/= 0.7 rope dia.

(1) or 2 rope diameters - whichever is greater.
(2) or 2 rope diameters - whichever is greater.
(3) per BeeBe International, Inc. memo #1075-4 of 11/15/82