Archive for the ‘manometro’ Category

Caldera y sala de calderas.

Miércoles, julio 18th, 2012

Estamos en la era de la tecnología o microtecnología, se fabrica lo último, lo más moderno y cuanto más pequeño mejor. Parece ser que el espacio es un bien escaso y tendemos a concentrarlo todo hasta límites insospechados.

Un ejemplo claro son las calderas de calefacción, en un espacio de 4o-45 cmts. de ancho, por 30-35 cmts. de fondo y 70-90 cmts. de alto, tenemos todos los elementos de cualquier sala de calderas de una comunidad de propietarios.  Incluso cada vez las calderas son más reducidas y con menor peso.

Caldera de calefacción.

Quien podría pensar hace más de 25 años, cuando la calefacción era solo para privilegiados que vivían en comunidades con calefacción central, que cualquier ciudadano tendría en su casa una caldera de calefacción, con el mismo servicio que disfrutan los usuarios con calefacción centralizada.

Para llegar a conseguir esto, ha explotado, en el mejor sentido de la palabra, el boom del gas natural canalizado o gas ciudad como llaman algunos usuarios. Los fabricantes se han empleado a fondo y han cojido la ola del progreso, de la modernidad, para ofrecer un servicio de calefacción que sea posible para todo el mundo.

Si analizamos los elementos de una caldera, tenemos que son los mismos de cualquier sala de calderas por muy grande o por mucha potencia que consuma.

Tenemos el circuito del agua caliente, el circuito de la calefacción, el intercambiador de placas, la válvula de seguridad, la válvula de llenado, el vaso de expansión, la bomba recirculadora, el manómetro, el purgador, la válvula de tres vías, etc.

Entonces ¿ las salas de calderas están sobredimensionadas ?, ¿ es necesario tanto espacio y calderas tan grandes en las salas de calderas ?. La respuesta es si, la diferencia está en la potencia. No es lo mismo una caldera para 40 vecinos que para un solo usuario.

El funcionamiento es el mismo, pero el tamaño es diferente. En este caso, el tamaño si importa.

Después de analizar las diferencias de una caldera a una sala de calderas, que nos quedará por ver. Minipisos con mini lavadoras, mini lavaplatos, mini microondas, etc.

El futuro es prometedor e incierto.

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Fugas de gas.

Miércoles, enero 5th, 2011

Cuando un instalador realiza una instalación nueva de gas natural, butano o propano, debe comprobrar que no existen fugas.

Se puede hacer de varias maneras aunque una es la más segura y obligatoria. Mediante un manómetro con regulación de milibares (mbar) o bares (bar), se conecta el mismo a una toma de comprobación previamente colocada en el tubo, empleando una goma flexible de unión.

Fugas de gas.

Se bombea aire con una perilla hasta que el manómetro marque una presión de prueba, determinada según el tramo de instalación a comprobar y la presión de trabajo a la que funcionará. Durante unos 15 minutos aproximadamente, también según la parte de instalación, se mantiene la presión, teniendo en cuenta tener cerrada la llave de bloqueo general.

Teniendo en cuenta que la presión se debe estabilizar, ya que puede variar por la temperatura ambiente, la variación de la presión inicial con la visible, al final del tiempo de espera, debe ser mínima. En este caso no hay fugas en la nueva instalación. Si por el contrario, la aguja del manómetro baja sin estabilizarse en un punto concreto, existe una o más pérdidas, que deben ser corregidas.

La forma de localizar el punto concreto de la/s fuga/s, es aplicar agua con jabón líquido en todas las uniones y piezas, y esperar a que se formen burbujas, originadas por la fuga. Ese será el punto a corregir.

Una vez arreglada la fuga se deberá a volver a comprobar la no existencia de fugas con el manómetro. Solo cuando la instalación sea completamente estanca, se podrá poner en servicio y meter el gas de la red o de las bombonas de butano o propano.

Purgar los radiadores de la calefacción.

Viernes, noviembre 26th, 2010

Se acerca el invierno y empezamos a pensar en poner a funcionar nuestro sistema de calefacción. Hay una serie de consideraciones que debemos tener en cuenta a la hora de poner en marcha la calefacción.

Purgar los radiadores.

Debemos asegurarnos que la presión del circuito de los radiadores, cuando la caldera está fría, se encuentra entre 1 y 1,5 bar. ¿ Cómo se comprueba ?, en el forntal de la caldera tenemos un manómetro, que es un círculo a modo de reloj, donde tenemos marcado la presión del agua que está dentro de los radiadores. Si la presión está por debajo de 1 bar, tenemos que llenar el circuito con la llave de llenado situada debajo de la caldera. En algunas calderas y sobre todo en los últimos modelos, el manómetro ha sido sustituido por un display digital, mucho más exacto y fácil de visualizar.

Si hemos llenado el circuito es probable que tengamos que purgar los radiadores. No hay que tener ningín temor a purgar los radiadores ya que simplemente se trata de sacar los aires del interior de los radiadores, para que estos no impidan que el radiador caliente.

¿Cómo sabemos si hay aires en los radiadores?, es muy sencillo, ponemos en marcha la calefacción y después de unos 10 o 15 minutos, cuando los radiadores estén calientes, podremos comprobar que una parte del radiador esta fría y otra caliente, esto significa que tenemos aires y hay que purgar. También se puede probar con los radiadores en frío, con el simple hecho de abrir el purgador. Si sale agua (foto), colocando un vaso debajo para recojer el agua, cerramos el purgador porque no tenemos aires y sino nos saldrá aire. Cuando el radiador esté purgado saldrá agua y ya podemos cerrar el purgador.

Después de purgar hay que volver a controlar la presión en el manómetro y dejar en la presión normal en frío. Importante cuando llenemos el circuito hacerlo siempre con la caldera fría para evitar contrastes de frío y calor que puedan perjudicar a los mecanismos de la caldera.

Localizar una avería de agua.

Jueves, enero 21st, 2010

Después de muchos años en el mundo de las reformas he aprendido que la prudencia y la reflexión son aspectos que hay que tener muy en cuenta a la hora de trabajar. Antes de realizar cualquier trabajo de reforma hay que planificarlo y desarrollarlo mentalmente como si lo estuvieras realizando. De este modo puedes analizar los materiales que necesitarás, el tiempo que vas a emplear y los posibles problemas que te van a surgir.

Un claro ejemplo es cuando hay que localizar una avería de agua. Pongamos el caso que un vecino tiene una humedad en el techo o en la pared junto al mismo. Lo básico es pensar si la avería proviene de una fuga de un tubo de presión que en este caso caería el agua constantemente. Si se trata de desague cae el agua con menos intensidad, deja una zona con mancha de huemedad más amplia y gotea de un modo intermitente que es cuando se utilizan los servicios de la cocina o el baño.

Segundo, debemos subir al piso superior y comprobar exteriormente si algun latiguillo gotea, o algun sifón pierde agua, o en la salida del inodoro se aprecia humedad. Si dicha vivienda tiene muchos años y no han reformado la misma, probablemente los desagues sean de plomo viejos y empiezan a fallar. En cambio si la vivienda está recien reformada, puede ser que los profesionales hayan dejado algo mal y provoque humedades al piso inferior.

En otros casos, en viviendas de muchos años, las bajantes de fecales son de uralita y con el tiempo se han rajado y empiezan a peder agua con el consiguiente incordio para los pisos inferiores. En este caso sería una avería de debe arreglar la comunidad por ser un elemento común.

En otras ocasiones cuando gotea agua constantemente, puede deberse a una fuga en la calefacción. La forma de comprobarlo es revisar el manómetro de la caldera y analizar si ha bajado la presión del circuito de los radiadores.

También sucede que a veces se producen obstrucciones en tuberías generales de desague, rebosando por las juntas de los tubos viejos y provocan humedades, en estas ocasiones, una vez desostruida la bajante desaparece el mal.

Lo más importante a tener en cuenta es que no hay que ponerse a picar las paredes o suelos de los pisos hasta no cerciorarse del origen de la humedad y picar solo lo necesario en el lugar indicado.