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Subchapter 6. Elevator Safety Orders
Article 14. Moving Walks

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§3091. Design Requirements.

(a) Direction of Passage. Passage from a landing to a treadway or vice versa shall be in the direction of treadway travel at the point of passenger entrance or exit.

(b) Load Rating.

(1) For the purpose of structural design, the load rating shall be considered to be not less than 100 pounds per square foot of exposed treadway.

(2) For the purpose of brake, treadway and power transmission calculations, the load rating shall be considered to be not less than 75 pounds per square foot of exposed treadway.

(c) Width.

(1) The width of a moving walk is the exposed width of treadway and shall be not less than 16 inches. The maximum width shall depend both on the maximum treadway slope at any point on the treadway, and on the treadway speed. The width shall not exceed the value determined by Table 3091C.

(2) The exposed width of treadway shall not be decreased in the direction of travel.

This width requirement applies only to moving walks having entrance to or exit from landings. It is not intended to preclude development of moving walk systems in which changes in width are made safe and practical by direct passage from one treadway to another, subject to the approval of the division.



                   TABLE 3091C 

                    Maximum Moving Walk Treadway Width in Inches
Maximum Treadway                Above 90 to          Above 140 to 
Slope At Any                    90 fpm Max.        140 fpm 180 fpm   
Point             Treadway       Treadway              Treadway  
                    Speed          Speed                 Speed                                                                  
0 to 5°          Unrestricted         60                 40    
above 5 to 8°         40              40                 40    
above 8 to 15°        40              40      Not permitted    

(d) Belt Type Treadways.

(1) Belt type treadways shall be designed with a factor of safety of not less than 5, based on ultimate strength.

(2) Splicing of the treadway belt shall be made in such a manner as to result in a continuous unbroken treadway surface of the same characteristics as the balance of the belt.

(3) The treadway surface shall be grooved in a direction parallel to its travel for the purpose of meshing with comb plates at the landings. Each groove shall be not more than 1/4 inch wide at the treadway surface and not less than 3/16 inch deep; and the distance from center to center of adjoining grooves shall be not more than 1/2 inch. Sides of grooves may slope for mold draft purposes and may be filleted at the bottom.

(e) Belt Pallet Type Treadways.

(1) Pallet connecting chains or other connecting devices between pallets, and pallets where part of the propelling system, shall have a factor of safety of not less than 10, based on ultimate strength.

(2) Splicing of the treadway belt shall be made in such a manner as to result in a continuous unbroken treadway surface of the same characteristics as the balance of the belt.

(3) The treadway surface shall be grooved in a direction parallel to its travel for the purpose of meshing with comb plates at the landings. Each groove shall be not more than 1/4 inch wide at the treadway surface and not less than 3/16 inch deep; and the distance from center to center of adjoining grooves shall be not more than 1/2 inch. Sides of grooves may slope for mold draft purposes and may be filleted at the bottom.

(4) Adjacent ends of pallets shall not vary in elevation more than 1/16 inch. The fasteners that attach the belt to the pallets shall not project above the exposed treadway surface.

(f) Pallet Type Treadway.

(1) Pallet connecting chains or other connecting devices, and pallets where part of the propelling system, shall have a factor of safety of not less than 10, based on ultimate strength.

(2) The maximum clearance between pallets shall be 5/32inch.

(3) The treadway surface of each pallet shall be grooved in a direction parallel to its travel. Each groove shall be not more than 1/4 inch wide at the treadway surface and not less than 3/16 inch deep; and the distance from center to center of adjoining grooves shall be not more than 1/2 inch. Sides of grooves may slope for mold draft purposes and may be filleted at the bottom.

(4) Adjacent ends of pallets shall not vary in elevation more than 1/16 inch.

(g) Treadway Slope. The slope of a treadway shall not exceed 15 degrees at any point.

(h) Speed.

(1) The maximum speed of a treadway shall depend both on the maximum treadway slope at points of entrance or exit, and on the maximum treadway slope at any other point on the treadway. This speed shall not exceed the lesser of the values determined by Tables 3091H1 and 3091H2.



                   TABLE 3091H1 

Maximum Treadway Slope at                         Maximum Treadway 
Point of Entrance or Exit                          Speed in F.P.M.  
  0 to 3°   .......................................... 180    
above 3 to 5°   ...................................... 160    
above 5 to 8°   ...................................... 140    
above 8 to 12°........................................ 130    
above 12 to 15°....................................... 125    


                    TABLE 3091H2 

Maximum Treadway Slope at                        Maximum Treadway 
Any Point on Treadway                             Speed in F.P.M.    
  0 to 8°   .......................................... 180    
above 8 to 15°........................................ 140    
(2) The maximum speeds listed in Tables 3091H1 and 3091H2 apply only to moving walks having entrance from or exit to landings. It is not intended to preclude development of moving walk systems in which high speeds are made safe and practical by direct passage from one treadway to another, subject to the approval of the division.

(i) Supports.

(1) For slider bed walks, the carrying portion of the treadway shall be supported for its entire width and length except where it passes from a support to a pulley. The surface of the slider bed shall be reasonably smooth. It shall be so constructed that it will not support combustion.

(2) For roller bed walks, the combination of roller spacing, belt tension and belt stiffness shall be such that the deflection of the treadway surface, midway between rollers, shall not exceed the quantity 0.094 inch + (0.004 times center to center distance of rollers in inches) when measured as follows:

The treadway surface shall be loaded midway between rollers with a 25 pound weight concentrated on a cylindrical footpiece 2 inches long by 1 inch diameter placed with its long axis across the belt. Deflection of this footpiece from its unloaded position shall not exceed the figure obtained above.

The rollers shall be concentric and true running within commercially acceptable tolerances.

(3) For edge supported belts, where the treadway belt is transversely rigid and is supported by rollers along its edges, the following requirements shall apply:

(A) With the belt tensioned through the take-up system, the permissible slope of a straight line from the top of a treadway rib adjacent to the center line of the treadway to the top of a treadway rib adjacent to the balustrade, in a line perpendicular to the path of the treadway, shall not ex-ceed 3 percent when the treadway is loaded with a 150 pound weight on a 6 inch by 10 inch plate located on the center line of the treadway with the 10 inch dimension in the direction of treadway travel.

(B) In order to support the treadway in case of localized overload, supports shall be supplied at intervals, not exceeding 6 feet along the centerline of the treadway. The supports shall be located at a level not more than 2 inches below the underside of the treadway when it is loaded under the test conditions required by the preceding paragraph.

(4) For pallet and belt pallet walks, pallet wheel tracks shall be so designed and located as to prevent more than 1/8 inch vertical displacement of the treadway should the pallet connection means break.

(j) Threshold Plates. The entrance to or exit from a moving treadway shall be provided with a threshold plate designed and installed to provide a smooth passage between treadway and landing and vice versa and conform to the following:

(1) The threshold plate shall be provided with a comb.

(2) The threshold comb teeth shall be meshed with and set into the grooves of the treadway surface so that points of the teeth are always below the upper surface of the treadway

(3) The surface of the plate shall afford a secure foothold. The surface shall be smooth from the point of intersection of the comb teeth and the upper surface of the treadway, for a distance not exceeding 4 inches and not less than 1 inch.

(k) Balustrades. Moving walks shall be provided with an enclosed balustrade on each side conforming to the following:

(1) Construction.

(A) Balustrades without moving handrails shall be designed so as to provide no surfaces which can be gripped by a passenger. On the treadway side, the balustrade shall have no areas or moldings depressed or raised more than 1/4 inch from the parent surface, except when skirt deflection devices, such as brushes, are used per Section 3091(k)(4). Such areas or moldings shall have all boundary surfaces beveled unless parallel to the direction of travel. The balustrades shall extend at normal height not less than 12 inches beyond the end of the exposed treadway.

(B) Glass or plastic panels, if used in the balustrades, shall conform to the requirements of ANSI Z97.1 except that there shall be no requirement for the panels to be transparent.

(C) Balustrades shall be designed to resist the simultaneous application of a lateral force of 40 pounds per lineal foot and a vertical load of 50 pounds per lineal foot, both applied to the top of the balustrade.

(2) The height of the balustrade shall be not less than 30 inches measured perpendicular to the treadway surface. At this height, the inner surface of the balustrade shall be located not more than 8 inches outside the vertical projected edge of the exposed treadway.

(3) If the balustrade covers the edge of the treadway, the clearance between the top surface of the treadway and the underside of the balustrade shall not exceed 1/4 inch. Where skirt panels are used, the horizontal clearance on either side of the treadway between the treadway and the adjacent skirt panel shall be not more than 1/4 inch.

(4) Where moving walks are provided with skirt deflection devices to protect against accidental entrapment of body parts, clothing, shoes, etc., the following shall apply:

(A) The rigid portion of the device shall not rise more than 3/4 inch from the parent surface of the balustrade.

(B) The plans, drawings, and specifications on the planned installation of the deflection device shall be submitted to the Division for review before the deflection device is installed. The Division shall review the plans, drawings, and specifications to ensure the planned installations and subsequent operation does not conflict with other requirements of Article 14.

(C) The deflection device shall be inspected by the Division for entanglement, entrapment, shearing, or tripping hazards.

(l) Guards at Ceiling. Where the intersection of the balustrade (deck board) and the ceiling or soffitt is less than 24 inches from the center line of the handrail, a solid guard shall be provided in the intersecting angle. The vertical face of the guard shall have a height of at least 7 inches and shall be rounded. Guards may be of glass if of the tempered-type conforming to ANSI Z97.1.

(m) Handrails.

(1) Two moving handrails shall be provided on each moving walk.

Exceptions:

1. Moving walks having a slope of 3 degrees or less and a speed of 70 feet per minute or less.

2. Moving walks having a width of 21 inches or less; where a single moving handrail may be used.

(2) The moving handrail at both the entrance and exit landings shall extend at normal height at least 12 inches beyond the end of the exposed treadway. The point where the moving handrail enters or leaves an enclosure shall be not more than 10 inches above the floor line.

(3) Hand or finger guards shall be provided at the points where the handrail enters the balustrade.

(4) The moving handrail return run and its driving and supporting machinery shall be fully enclosed.

(5) Each moving handrail shall move in the same direction and at substantially the same speed as the treadway.

(n) Drive, Motor, and Brakes.

(1) The driving machine shall be connected to the main drive shaft by toothed gearing, a coupling or a chain.

(2) Each moving walk shall be provided with an electrically released, mechanically applied brake capable of stopping and holding the treadway with any load up to the load rating. This brake shall be located either on the main drive shaft or on the driving machine and connected to the main drive shaft by toothed gearing, a coupling, or a chain.

Where a chain is used to connect the driving machine to the main drive shaft, a brake shall be provided on that shaft. It is not required that this brake be of the electrically released type if an electrically released brake is provided on the driving machine.

Exception: Moving walks which will not run in the down direction by gravity under any load condition up to their load rating with the power supply interrupted do not require brakes.

(3) Electrically released brakes shall stop the treadway automatically upon failure of power or when any of the safety devices specified in Section 3092(a) operate. Brakes on the main drive shaft, if not of the electrically released type, shall be applied should the drive chain part.

(4) Speed reducers shall meet the requirements for design and application as established for the various types in the appropriate AGMA Practice Standards, as follows:

420.03--Helical and Herringbone Gear Speed Reducers

430.03--Spiral Bevel Gear Speed Reducers

440.03--Single and Double Reduction Cylindrical-Worm and Helical-Worm Speed Reducers

441.03--Double Enveloping-Worm Gear Speed Reducers

460.04--Gearmotors

480.03--Shaft Mounted Speed Reducers

The loading shall be considered to be uniform and the service to be 24 hours per day.

(5) Chain drives shall be of the types covered by the following American Standards.

(A) ANSI B29.1--Transmission Roller Chains and Sprocket Teeth

(B) ANSI B29.2--Inverted Tooth Chains and Sprocket Teeth

When operating at the load rating of the treadway, the load imposed on such chains shall not exceed the horsepower rating as established by these standards.

The loading shall be considered to be uniform and the service to be 24 hours per day.

(6) When operating at the load rating of the treadway, the load imposed on V-belt drives shall not exceed the horsepower rating as established by the American Standard Specification for Multiple V-Belt Drives, USAS B55.1. The loading shall be considered to be uniform and the service to be 24 hours per day.

(7) Pallet propelling chains and drive components other than those specified shall have a factor of safety of not less than 10, based on ultimate strength.

(o) Supporting Structure.

The steel supporting structure for the treadway, balustrades, and machinery shall conform to Chapter 27, Part 2, Title 24, CAC.

NOTE

Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.

HISTORY

1. Repealer and new Table 3091C, repealer and new subsection (k), and amendment of subsection (l) and (n)(5) filed 6-23-77; effective thirtieth day thereafter (Register 77, No. 26).

2. Editorial correction of subsection (k)(2) (Register 95, No. 34).

3. Amendment of subsection (k)(1), new subsections (k)(4)-(k)(4)(C) and new Note filed 3-13-2000; operative 4-1-2000 pursuant to Government Code section 11343.4(d) (Register 2000, No. 11).

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