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fire fighting network

fire fighting network

(OP)
Good Afternoon I have a question , my company will built a fire fighting network and we are confused; According with the codes and standars of NFPA when you connect two pipes it is necesary to adapt an accesory or only weld the pipes . I am from mexico , thanks for your answer , really I need your help please .

RE: fire fighting network

. . . . . ? ?

RE: fire fighting network

Please define which NFPA standard and section. There are many.

what exactly is your query?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: fire fighting network

(OP)
I DON´T KNOW THE EXACTLY CODE OR STANDAR , I ONLY NEED TO KNOW FOR EXAMPLE WHEN YOU WILL BUILT A FIRE FIGHTING NETWORK AND YOU CONNECT TWO PIPES FOR SOMETHING, IT´S NECESARY TO PUT AN ACCESORY OR ONLY WELD THE TWO PIPES. THANKS FOR YOUR ANSWERS AND GOD BLESS YOU.

RE: fire fighting network

Your terminology is where we are having a problem. Are you talking underground piping or overhead piping? If underground, you are typically going to use Mechanical Joint fittings to join pipe and nothing will be welded that I have ever seen.

If you are talking overhead, the most common joining methods are grooved connections and threaded connections. If you need an outlet off the pipe, you can do with either a welded outlet or a mechanical outlet - commonly referred to as a mechanical tee. I've rarely seen pipes welded together. The times I have seen it has been in industrial settings.

Travis Mack
MFP Design, LLC
www.mfpdesign.com
"Follow" us at https://www.facebook.com/pages/MFP-Design-LLC/9221...

RE: fire fighting network

I wonder if he is referring to Siamese connections?

RE: fire fighting network

Sorry for translation.

Hola
Si y no.
La configuracion, diametros, materiales, etc, lo dice todo, pero si es que te refieres a unir dos tuberias de acero al carbono una con otra (por ejemplo ASTM A53), de agua de incendios en general: La NFPA no pide nada diferente a las uniones normales de tuberias de acero. Refiere los materiales, codos, tes, etc, y uniones a normas ANSI/ASME/AWWA que es lo normal en Mexico creo y hace simplificaciones de estas normas para que el tema sea mas popular o comercial, pero pide accesorios listados (UL o FM lo comun) donde aplique. Si requieres una union de cambio de diametro, un codo, una te, es lo mismo pero si no usas el accesorio correcto (bridas, codos, reductor, te ASTM A234) la union se vuelve un caso especial y requiere un dise;o de un ingeniero, o sea no.

Si puedes soldar union a tope con soldador calificado para ello, lo usual en Mexico, es lo mejor (usual para tuberias mayores de 100mm), los accesoios a tope no deben ser UL, con solo el ASTM pasa.
Tambien puedes usar:
-uniones con accesorios ranurados (mas conocida como union victaulic, listadas UL para incendios)
-uniones roscadas NPT (mejor solo para diametros de 75mm y menores, en 100mm o mayor es mas dificil evitar fugas), por ejemplo uniones a tope, codos, tes, de hierro galvanizado maleable (las que venden en fereterias para ca:eria comun), si el sistema es bajo norma, las figuras deben ser UL (la misma que se debe usar para gas LPG).
-si lo que ocupas es salir en te con un cambio de diametro considerable (de 150mm a 25mm o peor) esta la opcion de usar accesorios de derivacion (silletas).

Aguas, si la tuberia es de pared delgada, Ced 10, las roscas no son permitidas y otras opciones se reducen.

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