ANSI B77.1 2011 Edition, October 3, 2011
PASSENGER ROPEWAYS - AERIAL TRAMWAYS, AERIAL LIFTS, SURFACE LIFTS, TOWS AND CONVEYORS - SAFETY REQUIREMENTS
Includes all amendments and changes through Supplement A, November 30, 2012
Published By:American National Standards Institute (ANSI)
This document establishes a standard for the design, manufacture, construction, operation, and maintenance of passenger ropeways. For this standard, passenger ropeway categories include:
– aerial tramways (single and double reversible);
– aerial lifts (detachable lifts, chair lifts, and similar equipment);
– surface lifts (T-bar lifts, J-bar lifts, platter lifts, and similar equipment);
– tows (wire rope and fiber rope tows)
The purpose of this standard is to develop a system of principles, specifications, and performance criteria that will meet the following objectives:
a) reflect the current state-of-the-art in passenger ropeway design, operation, and maintenance;
b) be acceptable for adoption by government agencies and others.
It is recognized that certain dangers and risks are inherent in machines of this type and their operation. It is also recognized that inherent and other risks or dangers exist for those who are in the process of approaching, loading, riding, unloading, and departing from passenger ropeways. This system is intended to result in passenger ropeways that are designed, constructed, operated, and maintained in a manner that helps reduce danger and exposure to risk to passengers and maintenance and operational personnel, and to encourage improvements in productivity, efficiency, development, and progress consistent with the objectives.
Such a system with these stated objectives constitutes a safety standard.
Other ropeway classifications
Passenger ropeway configurations that do not fall within the categories specified in 1.1, but fall within the general category of passenger ropeways, should be evaluated by the authority having jurisdiction based upon the design engineer's specifications and the applicable provisions of this standard.
New materials and methods for passenger ropeways
Adoption of technological improvements in materials and advances in techniques is essential to enable the industry to keep pace with progress. If a designer or manufacturer proposes to use materials or methods not covered by this standard, those materials, methods, or both, shall be clearly identified, and complete design and test information shall be provided to the purchaser or owner and the authority having jurisdiction (see 1.4 – authority having jurisdiction).
Strict application of the provisions of this standard may not be appropriate in every instance. Wherever it may be proposed to depart from the provisions of this standard, the authority having jurisdiction may grant exceptions from the literal requirements or permit the use of other devices or methods that provide features comparable to those included in this standard.
Existing installations and those with design review completed by the authority having jurisdiction prior to the effective date of this standard need not comply with the new or revised requirements of this edition, except where specifically required by the authority having jurisdiction.
Operation and maintenance shall be in compliance with those requirements specifically listed (not included by reference) in the operation and maintenance subsection (2.3, 3.3, 4.3, 5.3, 6.3, 7.3) and normative Annexes A , D and F.
NOTE – Additionally, items listed under (188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124) are considered of special importance. Compliance on ropeways with design review prior to this standard shall be required.
Existing ropeways, when removed and reinstalled, shall be classified as new installations (see 126.96.36.199).
New installations and those with design review completed by the authority having jurisdiction after the effective date of this standard shall comply with the new or revised requirements of this edition.
A ropeway modification shall be defined as an alteration of the current design of the ropeway which results in:
a) a change in the design speed of the system;
b) a change in the rated capacity by changing the number of carriers, spacing of carriers, or load capacity of the carrier;
c) a change in the path of the rope;
d) any change in the type of brakes and/or backstop devices or components thereof;
e) a change in the structural arrangements;
f) a change in power or type of prime mover or evacuation power unit;
g) a change of the control system logic.
Modified ropeways shall be inspected and/or tested to assure compliance with the modified design. Test procedures and inspection criteria shall be provided by the designer or manufacturer
Interpretation of standard
In cases where additional explanation or interpretation of this standard is required, such requests should be referred to the Accredited Standards Committee (ASC) B77, c/o National Ski Areas Association, 133 South Van Gordon Street, Suite 300, Lakewood, CO 80228.