Clove Hitch is use to tie rope to a pipe or a 2x4 and a host of other things. It will do a decent job of grabbing onto the pipe without too much slipping. This is the knot that is use in Hemp Houses to hang the pipe battens. (this photo is missing the double half hitches. See below) clove1
 Start with your rope around the pipe. clove3
Take a wrap.  clove2
 The second wrap is placed over the first.  clove4
 The free end of the rope goes through the second wrap.  clove5
Once the free end is through, pull it tight.  clove6
This is a finished Clove Hitch. For safety sake, add the next couple of steps.  clove7
This is a Half Hitch. Take the free end and take a wrap around the load line, then pass it through itself.  clove8
 Pull it tight.  clove9
 Do that again.  clove10
This is what the final knot will look like. At this point, you should consider taping the loose end up to the load line.  clove11
This is a Double Half Hitch by itself. See above to learn to tie this.  dblhh1