What do the direction indicators DN, PN, and TN mean, and what are the differences between them? ?
Thread Content
I have a question for everyone: On the equipment layout diagram, what does the notation DN refer to? Some diagrams also use terms like PN and TN – what is the difference between them? ? ? I earnestly ask the experts for their guidance! ! ! This post was last edited by *aotao0421 on 2009-3-16 09:51]
N——Normal, nominal; D——Diameter; P——Pressure; T——Temperature; DN——Nominal diameter; PN——Engineering pressure
There might be some misunderstandings upstairs; I understand that
Here, DN, PN, and TN refer to direction indicators; on construction drawings, they are usually located in the upper right corner, with the arrow pointing north. In the design drawings produced by design institutes in the past, PN was commonly used, but recently I encountered DN on one set of drawings. I’m not sure how to distinguish between these terms I’d like to ask!
DN Descriptive north PN point to north TN turn to north ?
PN→True North, DN→Construction North? ? ? ? Looking forward to the correct answer
North of the PN factory? TN True North? Ask the general layout specialists
Oh, on wind roses, PN and TN are usually indicated. PN stands for the north side of a building, while TN refers to true north. An angle is often also specified between PN and TN, to assist fire safety authorities in carrying out their inspections; this is useful for things such as fire safety planning or wind energy utilization, as well as for larger-scale plans like urban planning. This post was last edited by zjken on 2009-3-19 21:32]
Indicates the purpose of the nozzle: D for transmitter, T for temperature, P for pressure, N for nozzle
I’ve seen PN and TN, but I’ve really never seen DN~~~ Please give the correct answer
TN: TRUE NORTH PN: PLAN NORTH DN has not been seen yet
I really don’t understand; I’m hoping experts can provide an answer.
PN: plant north – the north direction of a device; CN: construction n – the north direction in construction; TN: true north – the actual north direction