Materia:
Transporte de Fluidos
Maestra:
Iriana Hernández Martínez
Alum Al um n o:
Freddy Oswaldo Guzman Mendoza
Trabajo:
Investigación
507-A 507-A
Guti érrez Zamo Zamora ra ver. 08 de marzo de 2019 2019
1
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INDICE INTRODUCCION ....................................................................................................................................................................... 5 TANQUE DE ALMACENAMIENTO: ........................................................................................................................................... 6 PARTES DE UN TANQUE ...................................................................................................................................................... 6 CLASIFICACION DE TANQUES SEGÚN SU PRESION: ............................................................................................................ 7 TANQUES ATMOSFERICOS .............................................................................................................................................. 7 TANQUES A PRESION ...................................................................................................................................................... 7 TIPOS DE TANQUE ATMOSFERICO .......................................................................................................................................... 8 TANQUES CILÍNDRICOS VERTICALES; .................................................................................................................................. 8 TECHO: .................................................................................................................................................................................... 9 TECHO FIJO: ......................................................................................................................................................................... 9 TECHOS FIJO-CÓNICO: .................................................................................................................................................... 9 TECHOS FIJO TIPO DOMO DOMO:: ........................................................................................................................................... 10 TECHO DE DOMO GEOD ÉSICO DE ALUMINIO: ............................................................................................................. 10 TECHOS FIJO TIPO SOMBRILLA:..................................................................................................................................... 11 TABLA 2:VENTAJAS Y DESVENTAJAS DEL TECHO FIJO ............ ..................... .................. ................... ................... .................. .................. .................. .................. .................. .................. ......... 12 TECHO FLOTANTE:............................................................................................................................................................. 15 TECHO FLOTANTE EXTERNO ............................................................................................................................................. 16 TECHOS CON PONT ÓN. ................................................................................................................................................. 16 TECHOS DE DOBLE DIAFRAGMA. .................................................................................................................................. 16 TABLA 2 :VENTAJAS Y DEVENTAJAS TECHO FLOTANTE EXTERNO EX TERNO ...................... ............................... ................... ................... .................. .................. .................. ................ ....... 17 TECHO FLOTANTE INTERNO .............................................................................................................................................. 19 TECHO DE CACEROLA .................................................................................................................................................... 19 TECHO DE CACEROLA CON MURO DE CONTENCIÓN ................................................................................................... 19 TECHOS DE DIAFRAGMA Y PONTÓN ............................................................................................................................. 19 TECHO DE PANAL. ......................................................................................................................................................... 19 TABLA 3: TECHOS FLOTANTES INTERNOS VENTAJAS Y DESVENTAJAS .......................... ................................... .................. .................. .................. .................. ............... ...... 20
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FONDO DE LOS TANQUES : ................................................................................................................................................... 23 PLANOS: ............................................................................................................................................................................ 23 USOS: ............................................................................................................................................................................. 23 VENTAJAS: ..................................................................................................................................................................... 23 DESVENTAJAS: ............................................................................................................................................................... 23 CONO LEVANTADO ........................................................................................................................................................... 24 USOS. ............................................................................................................................................................................. 24 VENTAJAS. ..................................................................................................................................................................... 24 DESVENTAJAS: ............................................................................................................................................................... 24 CONO HUNDIDO. .............................................................................................................................................................. 25 USOS .............................................................................................................................................................................. 25 VENTAJAS: ..................................................................................................................................................................... 25 DESVENTAJAS: ............................................................................................................................................................... 25 INCLINADOS. ..................................................................................................................................................................... 26 USOS: ............................................................................................................................................................................. 26 VENTAJAS: ..................................................................................................................................................................... 26 DESVENTAJAS: ............................................................................................................................................................... 26 TANQUES A PRESION ............................................................................................................................................................ 27 TANQUE CILÍNDRICO HORIZONTAL: ................................................................................................................................. 27 RECIPIENTES VERTICALES. ................................................................................................................................................. 27 RECIPIENTES ESFÉRICOS. .................................................................................................................................................. 28 RIESGO EN TANQUES ............................................................................................................................................................ 29 MANTENIMIENTO PREVENTIVO............................................................................................................................................ 29 MANTENIMIENTO CORRECTIVO ........................................................................................................................................... 29 NORMAS : .............................................................................................................................................................................. 30 CONCLUCION : ...................................................................................................................................................................... 31 Bibliograf ía ............................................................................................................................................................................ 32
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INTRODUCCION
Los tanques de almacenamiento son un elemento esencial en todo sistema de abastecimiento, una gran parte de las sustancias utilizadas en la industria para la obtención de productos que permitan el desarrollo de las actividades humanas, se encuentran en estado líquido. El propósito fundamental de estos tanques es proveer una cantidad adecuada en las demandas máximas observando el aspecto económico y de capacidad suficiente Los tanques de almacenamiento atmosféricos y de presión representan para la industria activos de significativa importancia, pues ellos forman parte indispensable en los procesos de almacenamiento. estos tanques diseñados conforme al API 650, pueden ser de techo fijo o flotante, dependiendo la selección de uno u otro , de la presión de vapor y el punto de inflamación de los productos a ser almacenadoss . almacenado
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TANQUE DE ALMACENAMIENTO :
Cualquier recipiente recipient e que tiene una capacidad de liquido que excede los 277 litros (60 galones) aplicado a instalaciones fijas y que no son usados para procesos.
PARTES DE UN TANQUE: Además del tanque en si (base, cuerpo y techo) se encuentran los siguientes accesorios los cuales son muy importantes para el buen funcionamiento y manejo del mismo. 1.
Escalera: para tener acceso al techo, realizar y verificar mediciones.
2. Indicadores de nivel: muestra el del producto almacenado. 3. Válvulas: para iniciar, detener detener o regular la circulación (paso) de líquidos o gases. 4. Venteo: para evacuar vapores que se acumulen en el tanque. 5. Orificio Orifici o del techo: para hacer mediciones. 6. Manhole: para acceso del operador con el fin de realizar mantenimiento o reparaciones. 7. Entradas 8. Boca de salida: para evacuar el fluido almacenado a las líneas de transporte
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CLASIFICACION DE TANQUES SEGÚN SU PRESION: Existen muchas formas de clasificar los tanques, sin embargo existe una clasificación que es empleada por las normas, los códigos y regulaciones que esta basado en la presión interna de un tanque.
Clasificación por su presión interna
Tanques atmosféricos Tanques a presion
TANQUES ATMOSFERICOS Un tanque atmosférico es un depósito diseñado para almacenar o procesar fluidos, generalmente a presión atmosférica o presiones internas relativamente bajas. Irónicamente, la baja presión en el contexto de tanques significa que son diseñados para operar desde una presión un poco mayor a la atmosférica hasta 15 psig, ha sido diseñado para operar a presiones desde la atmosférica hasta presiones de 1,0 psig (de 760 mm Hg hasta 812 mm Hg) medidos en el tope del Tanque. Los tanques atmosféricos no podrán ser usados para el almacenamiento de líquidos a temperaturas iguales o mayores a su punto de ebullición. Los principales tanques atmosféricos son de techo flotante y de techo fijo
TANQUES A PRESION Un recipiente a presión es un recipiente cerrado, diseñado para soportar gases o líquidos a una presión sustancialmente diferente de la presión ambiental, ya sea por presión interna o presión externa, independientemente de su forma y dimensiones. Cuando el diseño interno de un contenedor excede 15 psig, este será conocido como un recipiente a presión
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TIPOS DE TANQUE ATMOSFERICO
TANQUES CILÍNDRICOS VERTICALES; El diseño en el tanque cilindrico vertical operando a la presion atmosferica, es el tanque cilindrico con techo conico y un fondo plano descansando em una cimetacion compiesta de arena, grava o piedra triturada . •
•
Almacenan grandes cantidades volumétricas volumétrica s con un costo bajo. Con la limitante que solo se pueden usar a presión atmosférica o presiones internas relativamente relativamen te pequeñas
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TECHO:
El techo es aquella parte de un tanque de almacenamiento capaz de soporta las cargas de diseño que se originen en el transcurso de la vida útil de tanque, tiene el objetivo para soportar e impedir que sustancias peligrosas puedan ocasionar daños a la estructura del tanque y puedan contaminar al producto almacenado , este elemento se encuentra en la parte superior del tanque. Los tanques cilindricos verticales de fondo plano cuentan con tres diferentes techos. TECHO FIJO: Los tanques de almacenamiento con techo fijos se emplean para almacenar productos no volátiles o de bajo contenido de productos livianos (no inflamables) como son el agua, diésel, asfalto, petróleo crudo, etc. Son capaces de soportar cargas vivas de diseño como la nieve, viento y cargas humanas
TECHOS FIJO-CÓNICO: Cubierta con la forma y superficie de un cono recto, se utiliza generalmente en fondos donde pudiese haber acumulacion de solidos y como transiciones , La configuración de este tipo de techos es una cubierta con la
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TECHOS FIJO TIPO DOMO : Sección de un cabezal esférico Los techos tipo domo son menos usados que los casos anteriores debido a que tienen un proceso de fabricación laborioso, ya que cada chapa y segmento tienen que conformarse con el radio de curvatura, incrementado de esta manera su costo y complejidad. Por su parte, de acuerdo al punto 5.10.6.1, el radio de curvatura te techos tipo domo debe estar comprendido entre 0,8 y 1,2 veces del diámetro nominal del tanque.
TECHO DE DOMO GEODÉSICO DE ALUMINIO: Este tipo de techo fijo ha llegado a ser muy popular. Ofrecen una alternativa económica, superior resistencia a la corrosión para una amplia variedad de condiciones y son estructuras que no requieren soportes internos. Pueden ser construidos, también, con cualquier diámetro requerido
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TECHOS FIJO TIPO SOMBRILLA: Polígono regular curvado por el eje vertical. Los techos de tipo sombrilla son una variedad del tipo domo, el cual solo conserva la curvatura sobre el eje vertical ya que sobre el eje circunferencial tiene semejanza con el tipo cónico. El radio de curvatura te techos tipo sobrilla se rige por los mismos valores que los techos tipo domo
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TABLA 2:VENTAJAS Y DESVENTAJAS DEL TECHO FIJO Techo fijo Tipo
TECHO CONICO AUTOSOPORTAADO
Ventajas
-
Mínimas obstrucciones
-
Puede requerir un
internas
techo más pesado de
Relativamente
placas gruesas.
económico -
Desventajas
-
Adecuado para capa de
Solo aplicable a tanques pequeños .
protección interna. -
Más economía y mayor eficiencia si se quiere convertir en techo flotante interno
TECHO CONICO SOPORTADO
a) Techo cónico soportado en el centro
-
Simple diseño
-
Menos ideal para
estructural.
capas de protección
Mínimas obstrucciones
interna.
internas.
-
Diámetro del tanque
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Techo fijo Tipo
b) Techo cónico soportado
Ventajas
-
Desventajas
Diseño estructural
obstrucciones
Relativamente
internas. -
Es adecuado para cualquier diámetro.
-
Muchas
simple. económico. -
-
Difícil
de
inspeccionar. -
Hace más costosa la
Puede ser rompible
conversión a techo
para ventilación de
flotante interno.
emergencia.
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Techo fijo Tipo
Techo Techo de domo o sombr illa
Ventajas
-
Desventajas
Excelente diseño
-
para capa interior. -
Excelente diseño
. Más caro que el techo cónico.
-
Aplicable solo para
para servicios de alta
tanques pequeños y
corrosión tales como
medianos.
el azufre.
-
No aplicable para altas presiones de vapor a menos que el vapor sea recuperado.
-
No es frágil.
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TECHO FLOTANTE: Los tanques de techo flotante tienen envolvente vertical y cilíndrica como los tanques de techo cónico. La cubierta flotante del techo es una estructura en forma disco que tiene suficiente flotabilidad para asegurar que el techo flote sobre todas las condiciones esperadas. Están construidos con un hueco de 8 a 12 pulgadas entre el techo y la envolvente así que no está unido de tal manera que el techo suba y baje con el nivel de líquido. El espacio entre el techo flotante y la envolvente es sellado por un empaque llamado tubo sello.
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TECHO FLOTANTE EXTERNO TECHOS CON PONTÓN. Estos techos son comunes para techos flotantes de aproximadamente 30 a 100 pies de diámetro, el techo es simplemente una membrana de placas de acero c on un compartimento anular que provee de la fuerza de flotación.
TECHOS DE DOBLE DIAFRAGMA.
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TABLA 2 :VENTAJAS Y DEVENTAJAS TECHO FLOTANTE EXTERNO Techo flotante externo Tipo Diafragma bajo con pontón flotante.
Ventajas
-
Desventajas
-
Construcción más barata que el de doble cubierta para 20
’
170
’
-
a
-
aislar el techo.
-
Estructuralmente más delgado que el de
.
doble cubierta.
Adecuado para altas presiones de vapor.
Pobre diseño para
-
Una fuga resultar í í a en
Capaz de reparaciones
un residuo en la
en servicio de
cubierta causando
accesorios
fuego en el sistema de
Buena flotabilidad.
drenado en el techo.
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Techo flotante externo Tipo
Domo de conservación de vapor.
Ventajas
-
Desventajas
Reduce o evita el
-
requerimiento para evitar fugas de gas. -
Costoso de construir y de mantener
-
Existen problemas de
Puede ser usado
corrosión en el área
como contenedo contenedorr
del sello a menos que
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TECHO FLOTANTE INTERNO TECHO DE CACEROLA . Es una simple hoja de acero en forma de disco con los bordes doblados hacia arriba para hacer la flotación. Estos techos son propensos a voltearse y hundirse por cualquier pequeña fuga o abertura que pueda tener. TECHO DE CACEROLA CON MURO DE CONTENCIÓN Este techo tiene compartimientos anulares abiertos en la periferia para prevenir el hundimiento que se pueda producir por una fuga.
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TABLA 3: TECHOS FLOTANTES INTERNOS VENTAJAS Y DESVENTAJAS
Techo flotante internos Tipo
TECHO FLOTANTE INTERNO VENTILADO ARRIBA DE LA ENVOLVENTE
Ventaja - Una buena ventilación ventilació n
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Techo flotante internos Tipos
TECHO FLOTANTE DE ALUMINIO CON CONTACTO
Ventajas - Puede ser instalado en cualquier envolvente que se elija -
Aplicable para altas presiones de vapor Más fácil de
el arreglo anterior
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SIN TECHO : Se usan para almacenar productos en los cuales no es importante que éste se contamine o que se evapore a la atmósfera como el caso del agua agua cruda, residual, contra incendios, etc. El diseño de este tipo de de tanques requiere de un cálculo especial del anillo de coronamiento.
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FONDO DE LOS TANQUES :
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CONO HUNDIDO.
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TANQUES A PRESION
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