For ya’ll that have been wondering what the different sanitary clamps are rated at, here is a handy chart. They are for you convenience only and for final design, you should use the actual clamp manufacturer’s certified rating.
6″ and below is consider piping by ASME and above a pressure vessel, when the operating pressure exceeds one atmosphere, which is about 14.7 psi.
LPG piping must meet 350psi, while pressure vessels must withstand 3X its maximum operating pressure.
| Sanitary Clamp Pressure Ratings | |||||
| Size | 13MHHD 2 pin | 13MHHM 1 pin | 13MHP 2 bolt | SSH 2 bolt | ASME |
| Rated Pressure in PSI at Temperature | |||||
| @70/250F | Temperature | ||||
| 1/2 | 1500/1200 | 1500/1200 | @450F | @ 302F | |
| 3/4 | 1500/1200 | 1500/1200 | 1160 | ||
| 1 | 500/250 | 500/250 | 1500/1200 | 1450 | |
| 1 1/2 | 500/250 | 500/250 | 1500/1200 | 1450 | |
| 2 | 450/250 | 450/250 | 1000/800 | 1450 | 1323 |
| 3 | 350/150 | 350/150 | 1000/800 | 1160 | |
| 4 | 200/125 | 200/125 | 800/600 | 870 | 838 |
| 6 | 150/75 | 300/200 | 725 | 412 | |
| 8 | 100/50 | 250/150 | 221 | ||
| 10 | 40/30 | 150/100 | 147 | ||
| 12 | 30/25 | 150/100 | 103 |
The weakest link in a sanitary piping system is the clamps as the tubing itself ranges from .065 wall to .083 wall, with theoretical bursting pressures ranging from 24,600 psi in 1/2″ to about 1000 psi in 12″.
| Theoretical Burst Pressure of Sanitary Tubing | ||
| Size | Wall Thickness | Burst Pressure |
| 1/2″ | 0.065″ | 24,600 psi |
| 3/4 | 0.065 | 14,700 |
| 1 | 0.065 | 10,500 |
| 1 1/2 | 0.065 | 6,600 |
| 2 | 0.065 | 4,900 |
| 3 | 0.065 | 3,200 |
| 4 | 0.083 | 3,000 |
| 6 | 0.083 | 2,000 |
| 8 | 0.083 | 1,500 |
| 10 | 0.083 | 1,200 |
| 12 | 0.083 | 1,000 |