Tri-Clamp Pressure Ratings by Clamp Style and Size

In a tri-clamp system the clamp and gasket joint sets the pressure limit long before the tube does.

Service ratings, psig at 70°F (21°C) / 250°F (121°C)

A dash means that style is not listed in that size. 1/2 and 3/4 inch high pressure values from sanitaryfittings.us, which matches GVC on every other 13MHP size.

T-bolt clamp, 304 SS, psig at 70°F (21°C)

How to use these ratings

• Temperature. From 70°F (21°C) to 250°F (121°C) the rating drops 20 percent (high pressure clamp, 1 to 4 inch) to 57 percent (single pin, 3 inch). No values are published between the two columns, so use the 250°F value for anything above room temperature.
• The gasket governs at temperature and at the cold end. Buna-N is rated to about 250°F (121°C) and only to about -30°F (-34°C) at the cold end. Hydrocarbon systems run to -65°C (-85°F), where only PTFE gaskets remain inside their rated range. See REF-CM-01.
• N.B. Oler systems. The 6 inch high pressure clamp is 300 psig at 70°F (21°C) and 200 psig at 250°F (121°C). That is why the 6 inch tube in shell and filter housings carry a 250 psi rating limited by the clamps, not the tube.
• Verify before relying on a number. Values were transcribed from the GVC Direct rating sheet. Spot check against the maker's current sheet for your exact clamp.

What to buy for this

High pressure double bolted clamps1.5 to 4 inch clamps for joints above standard ratings.6 inch heavy duty clamp6 inch heavy duty clamp, rated 300 psi.Clamp nut and bolt setsReplacement nuts and bolts for high pressure clamps.PTFE tri-clamp gasketsThe gasket for cold or high temperature joints.

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Sources. GVC Direct, Tri-Clamp Connection Service Ratings for 304 and 316 SS Connections; GVC product pages for clamp styles and T-bolt ratings. Cross-check: sanitaryfittings.us, Tri-Clamp Fittings Burst Pressure and Temperature.