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A imprescindibilidade da realização de ensaios e testes periódicos em elevadores 11145
Por Cláudio Henrique Guisoli
Nas inspeções de rotina mensais é avaliado o estado de conservação de equipamentos diversos de elevadores. Entretanto, as inspeções de rotina não são suficientes para garantir a confiabilidade operacional de equipamentos de segurança essenciais nos elevadores, por exemplo, limitador de velocidade, freio de segurança, freio eletromecânico da máquina de tração entre outros. Infelizmente, fatos recentes comprovam casos de acidentes, até fatais, em que a manutenção preventiva mensal estava sendo feita regularmente, mas equipamentos de segurança não atuaram quando requerido.
Ao comprar um veículo, o adquirente
recebe juntamente com o veículo o manual do proprietário. No manual constam as
revisões e suas periodicidades, que devem ser observadas para manter o carro em
bom estado de conservação e seguro. Assim, como veículos am por revisões
periódicas estabelecidas pelos fabricantes, também os elevadores têm de ar
por inspeções e ensaios periódicos no decorrer da vida útil, conforme
estabelecido por normas técnicas da ABNT, de modo a comprovar a condição operacional
segura dos equipamentos.
Quando e em
quais circunstâncias os elevadores devem ar por inspeções ou ensaios
periódicos?
Não temos uma norma técnica ABNT
específica a respeito de ensaios periódicos para elevadores elétricos de
ageiros. A norma ABNT MB 130:1955 “Inspeção
Periódica de Elevadores e Monta-Cargas” foi cancelada no ano de 2009, e até
a presente data não foi publicada outra norma ABNT para substituí-la, apesar da
importância fundamental que tal assunto requer. Entretanto, a norma ABNT NBR NM
207 estabelece em que circunstâncias e a quais ensaios os elevadores devem ser
submetidos, apesar de não entrar em pormenores de como realizar as inspeções e
ensaios.
Inspeções e ensaios periódicos em
elevadores recém instalados
Devem ser realizadas inspeções e ensaios
periódicos nos elevadores depois que eles tiverem entrado em serviço para
verificar se estão em condições operacionais seguras. Essas inspeções e ensaios
periódicos devem ser realizados conforme “Anexo E” da norma pertinente.
Inspeções e ensaios depois de modificações relevantes ou depois de um acidente
Inspeções e ensaios devem ser realizados
depois de modificações relevantes ou depois de um acidente para assegurar que o
elevador continua a atender a norma. As inspeções e os ensaios devem ser
realizados conforme “Anexo E”.
Em particular, são as seguintes as
modificações importantes:
Troca:
da
velocidade nominal; da
carga nominal; da
massa do carro; do
percurso do carro; do
tipo do dispositivo de travamento da porta de pavimento (a substituição de um
dispositivo de travamento por um do mesmo tipo não é considerada como uma
modificação importante).
Troca ou substituição:
do
sistema de controle; das
guias ou do tipo de guias; do
tipo de porta (ou a adição de uma ou mais portas da cabina ou de pavimento); da
máquina ou da polia motriz; do
limitador de velocidade; do
para-choque; do
freio de segurança.
Estes
ensaios serão, no máximo, aqueles requeridos para os componentes originais
antes da entrada do elevador em serviço.
Inspeções e ensaios periódicos no
decorrer da vida útil dos equipamentos
Inspeções e ensaios periódicos não devem
ser mais exigentes que aqueles requeridos antes do elevador entrar em serviço. Estes ensaios periódicos
não devem, através de sua repetição, causar excessivo desgaste ou impor tensões
que possam diminuir a segurança do elevador. Em particular, este é o caso de
ensaio de componentes como o freio de segurança e para-choque. Se forem feitos
ensaios nesses elementos, eles devem ser realizados com a cabina vazia e velocidade
reduzida. A capacidade desses elementos foi verificada durante os ensaios de
tipo. Além
disso, sua montagem correta e operação foram verificadas nos ensaios feitos
antes da entrada em serviço. A pessoa indicada para fazer o ensaio periódico
deve assegurar-se de que esses componentes (que não operam no serviço normal) estejam
sempre em condições operacionais.
As
inspeções e os ensaios devem incidir sobre:
os
dispositivos de travamento; os
cabos de suspensão; o freio
eletromecânico. Se os componentes do freio são tais que no caso de falha de um
deles o outro não é suficiente para frear o carro, uma inspeção detalhada deve
ser feita nos cubos, pivôs e articulações para assegurar que não há desgaste ou
acúmulo de pó afetando sua satisfatória operação; o limitador
de velocidade; o freio
de segurança ensaiado com cabina vazia e a velocidade reduzida; os
para-choques (tipo dissipação de energia) devem ser ensaiados com cabina vazia
e a velocidade reduzida; o dispositivo
de alarme.
No mercado de manutenção de elevadores a
rotatividade das empresas é elevada, principalmente por motivo de insatisfação dos
proprietários e síndicos quanto à qualidade do serviço apresentado e para redução
de custos. Entretanto, a inspeção inicial para assumir a manutenção de novos
elevadores na carteira é, geralmente superficial, obscurecendo problemas graves
que podem resultar em acidentes, por vezes até fatais. Portanto, a empresa de
manutenção ao invés de estar agregando um ativo interessante à sua carteira de
clientes, na realidade pode estar assumindo uma instalação potencialmente
perigosa do tipo “bomba relógio”.
O que temos visto é que a grande maioria
das empresas tem suprimido a inspeção inicial criteriosa e corrido o risco da
possibilidade de um acidente e, nesse caso, terá de assumir os ônus dos problemas
que, em princípio, eram de responsabilidade da empresa anterior, mas que se
tornaram seus assim que assumiram a manutenção.
O ideal é que os serviços de inspeção
anual sejam realizados por empresa independente, por exemplo, uma consultoria
técnica independente, sem quaisquer vínculos com a empresa mantenedora. A
inspeção inicial é de grande importância, principalmente em caso de elevadores
que entram na carteira sem qualquer histórico de manutenção da empresa
anterior, o que frequentemente acontece no setor de elevadores.
A maioria das capitais e as grandes
cidades interioranas do Brasil possuem legislação específica que obrigam as
empresas mantedoras a apresentar anualmente o RIA – relatório de inspeção anual
– para atestar a segurança operacional dos elevadores sob assistência técnica
de cada empresa.
Nas localidades onde o RIA é obrigatório,
geralmente, as empresas de manutenção incluem em seus contratos de prestação de
serviços a obrigatoriedade de realização da inspeção inicial e assumem o ônus
da realização da inspeção anual que irá gerar o RIA de cada elevador.
Com a concorrência predatória no mercado
de elevadores e o valor do ticket médio cada vez menor, é praticamente
impraticável assumir o ônus da realização de uma inspeção anual criteriosa e/ou
assumir a responsabilidade técnica de instalação da concorrência, sem cobrar o
valor devido pela execução dos testes e ensaios, que requerem pessoal técnico
especializado, tempo e equipamentos.
Não existe uma padronização do
check-list dos itens a serem verificados e ensaiados nas inspeções anuais.
Portanto, cada empresa relaciona os itens que julga serem importantes e/ou
pertinentes, o que faz com que algumas empresas avaliem muitos, outras pouco e
ainda outras quase nenhum.
Como conclusão, a realização da inspeção
anual requer pessoal técnico qualificado e, além disso, literatura técnica especializada
para elaboração dos procedimentos técnicos que serão utilizados no decorrer de
cada inspeção anual. Recomendo o “Manual de ensaios de componentes de
elevadores”, um excelente trabalho do nosso colega engº Francisco Thurler
Valente, que será, sem dúvida, de grande utilidade para as empresas
mantenedoras de elevadores.
Sobre o autor
Cláudio Henrique Guisoli , engenheiro
industrial mecânico graduado pelo CEFET-MG, diretor da empresa “Vertical
Consultoria”, escritor, palestrante, instrutor em treinamentos gerenciais e
técnicos, secretário do grupo de trabalho da ANBT em BH do projeto da
norma de inspeções e ensaios em elevadores elétricos de ageiros, com
experiência de 35 anos no setor de transporte vertical de ageiros.
Contatos: (31) 3337-9695 ou (31) 99795-3618 – E-mail: [email protected]
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