Pipe clamps
Pipe clamps are used to clamp a pipe to a flat surface – traditionally of two styles, grip type (anchor) or Non-grip type (saddle / guide).
Grip or Anchor clamp: used when the pipe requires a tight clamping to restrict all movements. You can see in the image below how there is no gap between the pipe and the inner surface of the clamp.

Grip / Anchor Style Pipe Clamp
Non-Grip or Saddle / guide clamp: used when it is desirable to have a looser fit to allow some movement. Movement could be thermal or mechanical (perhaps a vibration). Below is a representative image showing a gap between the pipe and the clamp. Realistically there would likely be contact at the top surface.
![Non-Grip [Saddle/Guide] Style Pipe Clamp](https://i1.wp.com/www.graphskill.com/wp-content/uploads/2017/02/nongrippingclamp-300x240.gif?resize=300%2C240)
Non-Grip [Saddle/Guide] Style Pipe Clamp
Graphskill Sums
Graphskill Sums (GSUMS) is the new way of labelling pipe clamps (Read More about GSUMS)

Pipe clamp drawing for Graphskill Sums
Inside Diameter=D
Inside height=C
Material Width=W
Material thickness=T
Hole centres=A
Hole centre to edge=B
Hole diameter=E
So the code for a pipe clamp becomes: Graphskill SUMS=CLAMP/MATL/D-W*T-C-A-B-E
Example: CLAMP/T304/64-40*8-63-140-30-14
This clearly defines the physical dimensions of the clamp. Grip or non grip becomes meaningless as the engineer knows the outside diameter of the pipe. So for example, in the above example if the outside diameter of the pipe is 63 mm, the engineer could ask for Inside Diameter=D = 64 as above, or if they wanted a non-grip style they could ask for Inside Diameter=D = 68 (or whatever clearance they require)
You can see Graphskill standard range of pipe clamps here: Pipe Clamps
You can design your own clamp and get a guide price here: Bespoke Pipe Clamps