CLAMPING THE PIPES:

When pipe clamping techniques are considered, two types of  clamping  joints  must  be  identified;  fixed  points and sliding  points.  Fixed  clamps  hold  the  pipes  in  a  rigid manner, while a sliding point allows  the  pipe  to  move in the axial direction of the pipe.

Fixed  points  divide  the   pipe   network   into    individual sections,  given  this  the  possible  longitudinal expansion and the corresponding  free  length  from  the   fixed   pipe points must be calculated.

Sliding points should be located so that  the  axial  movement   of   longitudinal   expansion  is not influenced by the fixed connections points.  Given  this,  the  sliding  Points   should not be installed on either side of the fittings in order to avoid acting as fixed points.

It is important, that the clamp or fastening  material does  not  damage  the surface of the pipe. The ideal fastening material  for PP-R pipes  are  rubber  lined  clamps  which  ensure  that  no mechanical damage of the pipe surface can occur.

Outside Dia. (mm)	Temperature Difference (ºC)
	0	20	30	40	50	60	70
20	90	65	65	60	60	55	50
25	110	80	75	70	70	65	60
32	120	95	95	85	80	75	70
40	145	110	10	90	90	85	80
50	170	130	120	110	110	100	95
63	190	150	140	130	120	110	100
75	210	150	150	140	130	120	110
90	220	160	160	150	150	140	125
110	250	180	180	170	170	160	140