Issues with openings in equipment such as water tanks
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Are there any standard specifications regarding the number of openings in equipment such as water tanks? What I’m asking about is the quantity, such as manholes or handholes, etc. For example, are there any regulations regarding the number of ion exchange beds, sight glasses, etc.? Please provide the standard and regulatory references, thank you.
What water tank? There are generally no strict requirements; usually, a manhole (for maintenance and anti-corrosion purposes) and a water level gauge are needed.
I really don’t know if there are any limits or regulations regarding the number of access holes in the water tank. As long as the sight glass allows sufficient visibility of the liquid level, that’s sufficient; the number of access holes only needs to be enough for cleaning and corrosion protection
What about the openings in other devices, even if they’re not water tanks? There should be some standard for manholes, access holes, etc. If you know, please let me know. Thank you.
The water tank is a pressure-free vessel, and its fabrication should comply with the standards for welded steel pressure-free vessels. To facilitate maintenance, an access hatch larger than 400 mm must be provided; handholes may or may not be included depending on practical considerations.
Water tanks only need to be easy to observe and clean; there is no limit on their number. Other types of equipment have specific regulations – for example, atmospheric pressure vessels, similar types of vessels, towers, and boilers all come with corresponding standards such as \"Steel Atmospheric Pressure Vessels\", GB150, GB151, the \"Vessel Regulations\", the \"Steam Boiler Regulations\", and so on