Pennsylvania Code › Title 34 - LABOR AND INDUSTRY › Part I - Department of Labor and Industry › Chapter 7 - ELEVATORS, LIFTS, ESCALATORS, DUMBWAITERS, HOISTS ANDTRAMWAYS › Subchapter M - AERIAL PASSENGER TRAMWAYS › CHAIR LIFTS, GONDOLA LIFTS AND SKIMOBILES › Section 7.445 - Towers

Current through Register Vol. 54, No. 28, July 13, 2024
(a) Towers shall be
					 located to conform to the profile of the terrain and to provide for the proper
					 deflection of the hauling rope so that passengers will not be higher above the
					 ground than necessary, nor so close as to encourage them to disembark at
					 locations other than established stations.
(b) The adjustment of tower sheave heights,
					 if made, shall be done in a manner to avoid overloading or underloading tower
					 sheave units. In the furthering of this purpose, there shall be made available
					 to the designer not only the profile of the natural terrain along the line but
					 also profiles, approved by the owner, of the various anticipated snow depths
					 for which the tramway is to be designed. The designer shall select one set of
					 tower locations which will be suitable for all of such profiles. For each
					 profile he shall determine the proper number and height of sheaves for each
					 tower. The sheave units furnished for each tower shall be suitable for all of
					 the profiles. Each tower shall be marked with the location of the assigned
					 height for the sheave units for each profile, giving each profile a serial
					 number or letter, such as A,B,C,D or the like. The operating instructions shall
					 clearly state that when the sheaves on one tower are at location A, for
					 example, then the sheaves on all towers shall also be at location A, and
					 similarly for all other serial letters. The instructions shall also include a
					 standard procedure for determining which serial designation to use to suit the
					 snow conditions existing at any time. The owner shall make sure that these
					 instructions are followed. After any such change the lift shall not be started
					 until the horizontal alignment of the sheave units is checked.
(c) The interrelation between the location
					 and height of towers, and design of sheave units and track cable saddles, shall
					 be subject to the provisions of §
											7.448(d) and (e) 
					 (relating to line structures).
(d)
					 Towers and ropes shall be so arranged as to prevent the collision of passing
					 carriers in the event of lateral swinging due to wind.
(e) The distance between two carriers, if
					 swung ten degrees inward from the vertical, shall be at least two feet six
					 inches. The distance between cables, for purposes of this check shall be
					 considered as equal to the gage of the line.
(f) Since the skimobile line is supported by
					 a trestle closely following the profile of the ground, most of the provisions
					 of this section are irrelevant, except that the trestle shall be bridged over
					 ski trails with an opening wide enough and high enough to permit the passage of
					 skiers. The same is true of the monorail type, except that subsections dealing
					 with wind action and lateral swing are relevant.
(g) When ski runs cross under the line, the
					 tower shall be high enough to assure clearance for the skiers under the chairs
					 or cars.
(h) Local wind conditions
					 shall be taken into consideration in every instance.
This section cited in 34 Pa. Code §
													7.441 (relating to definitions);
						  34 Pa. Code §
													7.442 (relating to applicability);
						  34 Pa. Code §
													7.462 (relating to applicability);
						  and 34 Pa. Code §
													7.465 (relating to
						  towers).