Proyecto: Rescate y puesta en valor las técnicas ancestrales

sound engineering practice: the use of engineering or technical methods to design or evaluate a device or system by taking into account relevant factors that may influence its efficacy and operation. This practice also involves the use of applicable standards, specifications, codes, and regulatory and industry guidelines, as well as accepted engineering and design methods and

installation and maintenance practices.

To provide a definition of Sound Engineering Practice, exactly the same as the definition in A17.1/B44

Section 2.20 Suspension Means and Their Connections

Suspension means shall conform to ASME A17.6, Part 4 and manufacturer’s recommendations using sound engineering practice and 2.20.1 through 2.20.3, as applicable. Access for suspension-means inspection purposes shall be provided 2.20.1 through 2.20.4.

To require a minimum standard of Sound Engineering Practice and to allow manufacturer’s requirements in addition to A17.6 and 2.20.1 through 2.20.4

2.20.1 Suspension Means for Counterweighted Traction Elevators. For counterweighted traction elevators, suspension means shall be drawn- galvanizedsteel wire rope and conform to ASME A17.6 - Part 1, and comply with 2.20.1.1 through 2.20.1.5 for steel wire rope.

Provide technical requirement to conform to A17.6.

2.20.1.1 The minimum diameter of any steel wire rope shall be not less than 9.5 mm (0.375 in.). Access for suspension means inspection purposes shall be provided.

Added requirement for inspection access for the suspension means.

2.20.1.2 The factor of safety of the steel wire rope shall not be less than 7.95.

See 2.20.3. Added a reference back to a requirement

2.20.2 Suspension Means for Uncounterweighted Traction Elevators. For uncounterweighted traction elevators,the suspension members shall be drawn-galvanizedsteel wire rope galvanized, preformedsteel wire ropeand conform to ASME A17.6 - Part 1, andcomply with 2.20.2.1 through 2.20.2.1312 for steel wire rope.

Provide technical requirement to conform to A17.6.

2.20.2.1 The minimum diameter of any steel wire rope shall be not less than 8 mm (0.3125 in.). Access for suspension means inspection purposes shall be provided.

Added requirement for inspection access for the suspension means.

2.20.2.2 The factor of safety of the suspension means shall be not less than 10. See 2.20.3.

The factor of safety shall be calculated by the following formula: F =

where

Moved to 2.20.3 so factor of safety applies to all ropes.

TN 15-1355 (A17 Wind Turbine Tower Elevator Committee) N = number of runs of suspension members under load

S = manufacturer’s rated breaking force in kN (lbf) of one suspension member W = maximum static load in kN (lbf) imposed on all suspension members with

the car and its rated load at any position in the hoistway

2.20.2.5 Suspension steel wire rope terminated at the end terminations shall be fastened by properly attached fittings or swages as recommended by wire- rope manufacturers or by and swage fittings shall complying with the following:

(a) Use of swage fittings only on regular lay, synthetic core, or IWRC ropes are permitted.

(b) They are swaged in a shop with a press under controlled conditions to guarantee reliable attachment.

(c) Where rope adjustment is required, they may only be used at one end of the rope.

(d) Swages shall be designed and tested in accordance with the design and testing requirements of EN 13411-3:2004.

(e) The swaging company shall be identified on the swage or on the rope data tag.

(f) Swaging shall not be performed in the field.

(g) The manufacturer shall provide verification means to assure the swage is crimped to manufacturer's specification.

To clarify terminations for both traction climbing and 1 to 1 ends of the suspension ropes.

This revision is also to clarify that the wire rope manufacturers must recommend swages.

2.20.2.9 Use of a single suspension steel wire rope is permitted provided a galvanized safety steel wire rope is provided of equivalent size and grade as the suspension steel wire rope (see 2.20.2.10).

To be consistent with the reference in A17.6.

2.20.2.10

(a) Suspension members' replacement criteria shall conform to ASME A17.6. Other manufacturers' recommended criteria shall be included in the Maintenance Control Program (see ASME A17.1/CSA B44 8.6.1), with sufficient detail to ensure that inspection criterion is provided. (b) When the steel wire suspension rope is replaced, the safety steel wire

rope shall also be replaced.

(c) A readily visible hour meter shall be provided on all suspended elevator cars and the suspension steel wire ropes shall be replaced after 250 h of operation or after 5 yr, whichever occurs first.

All replacement criteria is now located in A17.6, Part 4.

2.20.2.1110A safety rope shall be provided and used only in the event of loss of primary suspension or overspeed safety actuation and shall

(a) consist of a steel wire rope upon which a safety device (see 2.17.1) actuates to stop the car, and

(b) conform to 2.20.2and 2.20.3, except 2.20.2.3.

Renumbering

2.20.2.12 Only steel wire ropes in ASME A17.6 are permitted to be used in

wind turbine tower elevators. Added condition for allowance for manufacturer’s recommendations.

2.20.2.1311 Pertinent data located on the suspension means and safety rope shall be provided by a data tag securely attached to the fastenings or adjacent to the controller. The following data shall be provided:

(a) type of suspension

(b) the diameter of the rope in millimeters or inches

(c) the suspension-means manufacturer's minimum breaking force in kN or lbf

(d) the grade of material used (e) construction classification

(j) for steel wire rope, non-preformed, if applicable (g) for steel wire rope, finish coating, if applicable (h) name or trademark of the rope manufacturer

(i) name of person or organization who installed the ropes

TN 15-1355 (A17 Wind Turbine Tower Elevator Committee) (j) the month and year the ropes were installed

(k) lubrication information (l) swaging company, if applicable

2.20.2.12 Fastenings for suspension rope and safety rope shall have means to

prevent threaded connections or sliding components from vibrating off. Add requirements for a means such as nylock nuts, double nutting and cotter pins, etc. to prevent the fastenings from failing due to vibration.

2.20.3

The factor of safety shall be calculated by the following formula: F = S x N

W Where

N = number of runs of suspension members under load

S = manufacturer's rated breaking force in kN (lbf) of one suspension member

W = maximum static load in kN (lbf) imposed on all suspension members with the car and its rated load at any position in the hoistway and/or travel path

Moved to 2.20.3 so factor of safety applies to all ropes.

2.20.34 Chains Used for Replacement of Suspension Means Reserved for future use The suspension means shall be replaced in conformance with the criteria of ASME A17.6, Part 4 and manufacturer’s recommendations using sound engineering practice.

All replacement criteria is now located in A17.6, Part 4.

Section 2.23 Car and Counterweight Guidance Means, Supports and