Las protuberancias deberían:
a. no aislarse.
b. aislarse a 6 pulgadas (15,24 cm) desde el aislamiento de la tubería principal
c. aislarse dos veces lo que se aísla el tubo.
d. aislarse cuatro veces el grosor de la superficie que esté aislándose
d. aislarse cuatro veces el grosor de la superficie que esté aislándose
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