ISO 20321-2020 pdf free download – Petroleum, petrochemical and natural gas industries — Safety of machineries — Powered elevators.
5Safety requirements and/or protective/risk reduction measures
5.1 General requirements for powered elevators
The powered elevator shall comply with IS0 13535 and the additional requirements according to thisdocument.The requirements of this document take precedence over those of ISO 13535.
The powered elevator shall be designed according to the principles of lSo 12100 for relevant but notsignificant hazards which are not dealt with by this document.
5.2 Mechanical strength
The mechanical strength of the powered elevator shall be in accordance with ISo 13535:2000, Clause 5.Adequate mechanical design shall be verified by a static test in accordance with IS0 13535:2000 andAnnex B.
5.3 Safety design of powered elevators5.3.1General
The powered elevator design and product verification shall be carried out in accordance with Annex B.
5.3.2 Ergonomic design
The powered elevator shall allow safe handling of the elevator during all stages of the transport,installation and operation process.
5.3.3 Fastening methods and DROPs prevention of parts5.3.3.1 Primary-fixing
Primary fixing is the primary method by which an item is fixed to prevent unintentional dropping orfalling,e.g. bolted connection/welds.
5.3.3.2Securing against loosening (secondary retention)
Secondary retention is the method for securing a part from unintended loosening resulting in loss ofclamping force and/or pretension and/or unscrewing and/or displacement and/or loss of any part.
All parts for which unintended loosening can create a hazard shall be fastened with a method preventing unintended loosening, e.g. by tab-washer, spring washer.
The reliability of the retention method shall be assessed in accordance with ISO 12100.
5.3.3.3 Securing against dropping (DROPS prevention)
Appropriate design measures shall be taken for all parts, which can become a hazardous dropped object in case of component failure.
The reliability of the securing method shall be assessed in accordance with ISO 12100.
The causes of failure taken into account shall include:
a) vibration;
b) improper maintenance;
c) corrosion;
d) shock loading;
e) collision.
The potential for dropped objects/falling objects shall be prevented by measures including but not
limited to:
a) design;
b) speciality fasteners;
c) lanyards, cabling or safety wire;
d) guarding.
5.3.4 Suspension points The powered elevator shall be designed so that it cannot inadvertently disconnect from its suspension points regardless of the angle of rotation relative to the suspension points. When the powered elevator has secondary suspension points for suspending another elevator underneath, these suspension points shall be tested in accordance with B.2. The rating of each secondary suspension point, determined in accordance with ISO 13535, shall be marked at the suspension point sufficient to indicate the maximum load that can be applied.
5.3.5 Moving parts, pinch points and guards The powered elevator shall be designed to provide safe operator contact with designated areas for operation. The provisions made shall include at least the following.
a) Dedicated areas for placing hands for operating the elevator shall be coloured green by means of paint, grip points or otherwise.
b) Handles shall be designed so that an operator cannot be injured by other parts of the elevator. If interference is unavoidable, adequate protective measures such as guards shall be provided.
c) When other measures are not practical, warnings shall be displayed near or on identified potentially hazardous pinch points.ISO 20321 pdf download