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For simply inserting blocks as @imadHabash insert works great.
I would check to see if your company has a standard that they use (or are supposed to use). If they do they likely have blocks for the associated standard.
If you are starting this from ground up you should look into creating templates which will have everything in you drawing ready to go. This example is for electrical but the ideas are the same. A template will have all you blocks already loaded in it so you dont have to dig to far to load them. :https://knowledge.autodesk.com/support/autocad-electrical/learn-explore/caas/CloudHelp/cloudhelp/201...
I find it useful when dealing with ISO to make sure i have the polar tracking set to 30.
If you are having to create the pipe symbols i might start by downloading something like this : http://www.cadforum.cz/catalog_en/block.asp?blk=3932 and create blocks out of those pieces. (or simple copy and paste, but id recommend creating blocks)
CADnoob