Autocad Blocks - 2D - Free for Download

Fasteners-2D

Flanges-2D

Ladders-2D

Pipes-2D

Process and Instrumentation Symbols-2D

Instructions for using Process and Instrumentation Symbols

1.  Store the drawing in its final resting place. 

2.  Open the drawing, then use Design Centre.  Navigate to the open drawing, and click on blocks.
Select the first block, scroll down, hold down shift and select the last block. They should 
all be now selected. 

3.   Get Tool Pallets up and right click to create a new tab.
Drag the highlighted blocks onto the blank tool area.  It will take a few minutes for them
all to appear.  Experiment with how they are displayed, by right clicking and choosing
View.  Now if you are drawing a P and ID, just drag the block from the pallet, and it 
will get inserted in your drawing.