Invar

The ultimate solution for the most demanding applications. Special Invar material is used for the inner pipe, eliminating the need for flexible bellows. Chart’s pipe is qualified in all respects to ASME Code, Section B31.3, chemical plant and petroleum refining piping for 150 psi. Invar’s extremely low thermal contraction eliminates the need for bellows or convoluted flex hose. All-rigid construction means design simplicity and long-term integrity; no extra weld fatigue from adding items for construction; less stress during over-the-road shipments; and minimal damage during installation. Bayonet or field weld connections.

Standard sizes are 1/2" x 1 1/2", 1" x 2 1/2", 1 1/2" x 3", 2" x 3 1/2".

Internal Bellows

Our most common solution for many industrial applications. Internal bellows eliminate contraction of the outer pipe and give it a clean look. This industrial/commercial grade product is built to the same rigid requirements as ASME piping. The material is very corrosion resistant. Bayonet or field weld connections.

Standard sizes are 1/2" x 2", 1" x 3", 1 1/2" x 3 1/2", 2" x 3 1/2" and 3 x 5".

External Bellows

External bellows are a good choice for our customers who need higher pressure ratings or reduced pressure drop, as the flexible bellows material is moved to the outer jacket. This product is qualified in all respects to ASME Code, Section B31.3, chemical plant and petroleum refining piping for 150 psi. The material is very corrosion resistant. Bayonet or field weld connections.

Standard sizes are 1/2" x 1 1/2", 1" x 2 1/2", 1 1/2" x 3", 2" x 3 1/2" and 3 x 5".

Helium Lines

The solution for helium piping starts with 2 1/2 times more insulation for super-low heat leak. Field joints are also 67% more efficient than standard piping. Chart’s helium lines are qualified in all respects to ASME Code, Section B31.3, chemical plant and petroleum refining piping for 150 psi.

Standard sizes are 1 1/2" x 4", 2" x 5", 3" x 6" and 4" x 8".

	Invar	Internal Bellows	External Bellows	Helium
FEATURES
Heat Leak
Pressure Drop
External Durability
Installation Flexibility
Section Connections	Bayonets or Field Joints
MATERIALS
Inner Pipe	Invar36	T304 Stainless Steel
Outer Jacket	T304 Stainless Steel; Bright Annealed (1)
DESIGN CODE	Built in accordance with ASME, Section B31.1 (2)
MAWP (3)	150 psig
OUTER JACKET SIZES
1/2" Inner	2" Nominal Pipe Size
1" Inner	3" Nominal Pipe Size
1-1/2" Inner	3-1/2" Nominal Pipe Size
2" Inner	3-1/2" Nominal Pipe Size
3" Inner	N/A	5" Nominal Pipe Size
4" Inner	N/A	6" Nominal Pipe Size
Larger	N/A	Larger sizes are available - consult factory for details