15.9 Sanitary Clamp Pressure Ratings

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

 


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