Sanitary Tri-clamp Sizing Guide

  1. Clamp Size is determined by the outside diameter of the tubing, NOT the outside diameter of the ferrule.
  2. You can join the compatible sizes, such as the ½” and the ¾”, but remember the tubing sizes can be different and will affect flow. Consequently, use the larger size gasket.
  3. Tri-clamp fitting typically has about a ½” greater diameter than the outside diameter of the tube.

304SS and 316SS

304SS Type 304, with its nickel-chromium content and low carbon content, is the most versatile and most used austenitic stainless steels. It contains 18% chromium, 8% nickel and 0.8% carbon. Type 304 is resistant to oxidation, corrosion and durability.

316SS Type 316 is an austenitic stainless steel chrome-nickel stainless steel and heat-resistant steel with superior corrosion resistance compared to other chrome-nickel steels when exposed to types of corrosive agents chemical. It contains 18% chromium and 8% nickel and 0.8% carbon and maximum 3% molybdenum. 316 contains molybdenum, it has a greater resistance to chemical attack than 304. Type 316 is more durable and easy to clean. It is much more resistant to solutions of sulfuric acid, chlorides, bromides, iodides and fatty acids at high temperature. Molybdenum are needed to manufacture certain pharmaceuticals to avoid excessive metal contamination.

Gasket Materials

Buna - Excellent resistance to petroleum-based fluids. Not recommended for strong acids and ozone.  -40° F to 250° F (-40°C to 121°C).

Viton - Excellent oil and air resistance. Very good chemical resistance. Not recommend for continuous use in SIP (steam in place) procedures. -20º F to 410º F (-30°C to 210°C).

EPDM - Great ozone, chemical and aging resistance. Do not use EPDM gaskets for mineral oils, solvents, or aromatic hydrocarbons. -60° F to 300° F (-51°C to 150°C).

Silicone - Abrasion resistance: poor and very flexible for low temperature. It is not always a good choice with oils.  -75° F to 450° F (-60°C to 232°C).

Teflon - Abrasion Resistance: fair (not recommended where large temperature variations occur frequently, leakage can occur) -40° F to 450° F (–40 to +232 °C).

Pipe Sizing Guide

The pipe chart shows the outside diameters and the wall thicknesses for various pipe sizes. The dimensions vary according to the schedule number. The most common is Schedule 40 and the rarest is Schedule 5. The nominal pipe size (NPS) is not determined by the outside diameter nor the inside diameter of a pipe.