Controller and Valve Replacement in a Hydraulic Elevator
A six-story office building has a 20-year-old hydraulic elevator. The owner's contractor proposes to replace the relay-based controller with a new solid-state controller and to replace the existing valve with a different manufacturer's valve that has adjustable acceleration and deceleration. The car and doors remain unchanged. The building is occupied, and the owner wants the work done over a weekend so the elevator can be back in service Monday morning. The contractor tells the owner that because the motor, cylinder, and car are not being replaced, the work is 'just a repair' and no permit or inspection is needed. The new controller uses different door timing and valve-feedback logic, and the new valve changes the pressure and flow characteristics of the system. The mechanic is asked to begin work Saturday at 7 a.m. and to have the unit running by Monday.
1. Is the proposed work a repair or an alteration under the Board of Elevator Regulations? Explain how you classify each component.
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A repair restores equipment to its original design using like-kind components; an alteration changes the design, operation, or performance beyond the original specifications. The valve change is not like-kind: a different manufacturer's valve with adjustable acceleration and deceleration changes pressure, flow, and ride characteristics, so it is an alteration. The controller replacement also changes operation because the new logic and valve feedback differ from the original relay system; it is an alteration even though the motor, cylinder, and car are untouched. The test is not which major components remain, but whether the equipment's design or operation changes. Because at least one alteration is involved, a permit is required before work begins, and the unit cannot be returned to service without the required inspection and a new certificate.
2. What permit and inspection steps should the mechanic require before starting, and what should happen if the owner insists on Monday operation?
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The mechanic should not start alteration work without a permit from the authority having jurisdiction. The application should identify the controller and valve, include the manufacturer's specifications, wiring and valve diagrams, and be approved before installation. After installation, the AHJ must inspect the altered equipment and witness the required tests, including relief-valve and pressure tests, leveling, door operation, emergency lowering, and the altered controller functions. A new certificate of inspection is required before public use. If the owner insists on Monday operation, the mechanic must refuse to place the unit in service or energize it for use, explain that operation without a certificate is a violation, and document the refusal in writing. The mechanic should not let schedule pressure override the permit and inspection requirement.