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what is the valve leakage rate and its relation with valve design

i need help in selecting and specifying valve for application the application waste water the pipe material is concrete i am not sure what valve to use butter fly , gate or ball valve

i want to calculate heat loss from vertical tank diameter 20 m height = 12 m the roof are cone shape i will use your formal is it best for these case is there is better formals or there is a program to calculate it

yes , that right there mustn't be anypresure loss

please i want arefrence to begin to understand fire tube boiler opeation

how to calculate convection cofficient on vertical cylinder and cone shape is there aprogram to calculate or equation

i want to ask what is the chemical cleaning used in cleaning fuel oil tank and is it better that sand plasting as iam used to do sand plasting and is it better to caot tank inside as my tank is without coating

i have the same question if i want to erect atank as i am the puisher how shall i define the time of erection for example tank diameter = 15 m height = 12 m inernally & external coating and how specisify the time to remove old tank

i make asteam connecion and enter in the pipe

eng MJCronin please tell me what is the standard (refrence)for these values thanks for your valuable comment

the tank material are carbon steel , fluid gasoline , the tank in avery moisture enviroment (beside the sea)so i wish to tell me what is the refrence to get the corrosion range depend on these data

in API 650 indesign section of bottom and shell plate CA = corrosion allowance the Purchaser must define it i don't know how to define it i know storage liquid , steel plate material so please i want to know how to calculate corrosion allowance thanks