Regarding methanol floating roof storage tanks
Thread Content
I am currently studying some standards and design manuals in order to prepare for the design of two methanol storage tanks with an internal floating roof, each with a capacity of 10,000 cubic meters. I would like to ask: 1. How is the volume of methanol in internal floating roof storage tanks measured? What we have designed here is the finished product tank area. It shouldn’t be possible to use the oil hole. . . . 2. I read in the \"Design Code for Tank Areas in Petrochemical Storage and Transportation Systems\" that storage tanks equipped with nitrogen gas seals do not require flame arresters; I was wondering if flame arresters are not used in other designs as well? 3. Are internal escalators provided in methanol floating roof storage tanks like this? Is it still sufficient to just install a manhole with a core? Is it still necessary to install an escalator to the top of the tank from the outside? Is it still necessary to add a manhole on the top of the tank? 4. Regarding methanol, which is used to generate foam on the surface of liquids, at what approximate height should it be applied? I know that for external floating roofs, the sealing is done at the primary and secondary sealing points, but what about internal floating roofs? Should foam baffles be installed? 5. Does the water discharged from the fire hoses used for external spraying need to go through chemical wastewater treatment? 6. What are people’s thoughts on the accidents and leaks? 7. Is the air discharged in case of a safety valve failure released directly into the atmosphere? Do we still need to take over and carry the torch? 8. Where is the location of the nitrogen gas seal used for the internal floating roof? Are there any other sealing methods that need to be used? 9. Is it necessary to conduct calculations to verify overturning and sliding caused by wind loads? The tank was built in Inner Mongolia. 10. Methanol has a low freezing point, and temperatures in Inner Mongolia are not very high during the summer. Is it still necessary for storage tanks to have insulation or cooling measures? :'(It’s my first time doing this, and there are many things I don’t understand. I hope those who have experience with methanol storage tanks can **teach me and give me some guidance.
The original poster has asked too many questions; it can’t be explained in just a few words. There are many posts on the forum regarding internal floating roof tanks; I suggest you take a look first.
1. How is a methanol floating roof tank measured? What we have designed here is the finished product tank area. It shouldn’t be possible to use the oil hole. . . . Radar level measurement. 2. I read in the \"Design Code for Tank Areas in Petrochemical Storage and Transportation Systems\" that storage tanks equipped with a nitrogen gas seal do not require flame arresters; I wonder if this applies to all other designs as well? Atmospheric pressure vessels do not have a nitrogen seal, so a breathing flame arrester needs to be installed at the top. 3. Is an internal ladder provided in storage tanks with a methanol floating roof like this? Is it still sufficient to just install a manhole with a core? Is it still necessary to install an escalator to the top of the tank from the outside? Is it still necessary to add a manhole on the top of the tank? No internal escalator is provided; a manhole with a core is installed, and an external escalator must be provided to the top of the tank. Vent holes should be made in the top of the tank. 6. What are people’s thoughts on the accidents and leaks? A spill tank should be provided, and the drainage from the tank area shall have two separate drainage systems: one connected to the sewage treatment facility, and the other leading to the spill tank. 7. Is the air discharged in case of a safety valve failure released directly into the atmosphere? Do we still need to take over and carry the torch? Atmospheric pressure storage tanks, without safety valves; the outlet of the breather valve leads directly to the atmosphere. 8. Where is the location of the nitrogen gas seal used for the internal floating roof? Are there any other sealing methods that need to be used? At atmospheric pressure, no nitrogen sealing is required. 10. Methanol has a low freezing point, and temperatures in Inner Mongolia are not very high in summer; is it still necessary to insulate or keep the storage tank warm? If no water cooling spray is installed, insulation should be provided to prevent direct sunlight from causing the temperature inside the tank to rise ； No cooling is needed.
Agree with the answer from Floor 3; thanks for the helpful response.