Regarding the design issues of the storage tank, thank you
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Question 1: Why is the light-transmitting hole located at a position symmetrical to the manhole or cleaning hole (180 degrees)? 2 Why is it necessary to clean the access hole even when there is already one? Can’t the access hole itself perform the cleaning function? There’s also a drain pipe – is it the same opening as the sewage outlet? 3 Regarding the calculations for the spiral ladders in storage tanks, refer to page 298 of the book \"Design of Chemical Equipment\" under the sections on spherical tanks and large storage tanks; there is a formula for the expanded length of the inner plates of the spiral ladder, and this formula has nothing to do with the diameter of the tank. However, it does relate to the expanded length of the outer plates. How was that formula for the outer plates derived? Also, how is the formula for determining the horizontal position of the tripod on the pipe wall derived? I don’t understand it. How large should the 4 top-platforms be designed to be, and which pipe openings should they lead to? I know they need to lead to the breathing valve opening, the oil measurement port, and the light-transmitting port. Are there any others? Should a platform be built there, or steps? 5. What are the differences between China’s current tank design standards, GB50341 and SH3406? I heard that one of them is no longer in use. Thank you all. Any future questions related to tanks should be posted under this topic. Thank you for your guidance
I would appreciate some guidance from the teachers. . . . . . . . .
1. Consider the range of light illumination. 2. The manhole can be used as a cleaning access, but it must be located at the bottom of the tank. What kind of water does the drainage pipe carry away? The discharge outlet exists because of sediment at the bottom of the tank. 3. This issue should be consulted with equipment specialists. 4. The openings at the top of the pipe are usually designed on the same side to facilitate centralized operation; the platform is generally 800~1200 mm in size, and anti-slip steps should be provided at the center where the roof is removed. 5. I’m sorry, I don’t know
1. Why is the light-transmitting hole placed at a position symmetric to the manhole or cleaning hole (180 degrees)? When cleaning, large tanks help facilitate air circulation inside them, thereby reducing the concentration of oil and gas within. 2 Why is it necessary to clean the access hole even when there is already one? Can’t the access hole itself perform the cleaning function? There’s also a drain pipe – is it the same opening as the sewage outlet? The cleaning holes are flush with the surface, larger than manholes, and the height at which these manholes are located is at a certain distance from the bottom of the tank. How large should the 4 roof platforms be designed to be, and which pipe connections should they have? I know there should be access to the breather valve, the oil level gauge port, and the light-transmitting port. Are there any others? Should a platform be built for access, or steps? There are also safety valve ports ； The breather valve and safety valve are located on the top of the tank ； The oil measurement port is located near the platform ； The light-transmitting holes are located at a distance of approximately 800~1200 mm from the tank wall. The above are just my personal opinions; please point out any mistakes.
First of all, thanks to the two people who replied above for their excellent answers. I took a look; the data sheet mentions a \"purge hole\", with a diameter of around DN100. Does it refer to a \"cleaning hole\"?
Reply to 3# Song Qingshan: 1. Considering the range of light illumination (the illumination range is as large as the opening size; how should this be taken into account?) ）
Reply to 4# It’s still uncertain. Cleaning the large tank helps improve air circulation inside it, thereby reducing the concentration of oil and gas within the tank. (Ventilation and exhaust are understandable, but how about light transmission? If light can get in, the openings are so large; when people enter through those access holes, it’s completely dark on that side. Is this my understanding?) ? ? ) The cleaning holes are flush with the surface, larger than manholes, and the height at which these manholes open is at a certain distance from the bottom of the tank. (My device has a DN100 purge port – is this the cleaning port?) ）
Reply 6# *nchen: The illumination range is not limited to just the size of the opening. Symmetry is for maximizing light
Another question: For internal floating roof storage tanks, when is the floating deck installed – after or before the tank roof is completed? How is it installed? Is it done by installing pieces of it one by one, similar to a grid, through the manhole and then assembling them together? What is the general structure of an internal floating disk? Generally, internal floating roof storage tanks have core extraction manholes on their walls – is this necessary? Do floating roofs also have manholes? From the underside of the floating roof to its upper side. Thank you
Another question: For internal floating roof storage tanks, when is the floating deck installed – after or before the tank roof is completed? How is it installed? Is it done by installing pieces of it one by one, similar to a grid, through the manhole and then assembling them together? What is the general structure of an internal floating disk? Generally, internal floating roof storage tanks have core extraction manholes on their walls – is this necessary? Do floating roofs also have manholes? From the underside of the floating roof to its upper side. Thank you
Reply 7# *nchen: The purge hole is used for purging pipelines, not for cleaning. The cleaning holes are quite large, like little doors. Although the light-opening on the top of the tank is small, it’s not very dark inside; I’ve been in there – it’s an empty large tank. Light undergoes diffraction as it passes through the aperture.