ASTM A355 P5,T5,P9,T9,T11,P11,P22,T22,P12,T12 Seamless Square Rectangular Double H welding Fin Tubes pipe finned tubes

Manufacturing process

Square or Rectangular Fins are welded on two steel base tubes. We call it Double H (HH) fin type.

Acceptance Criteria
Approved drawing and the delivery conditions (TDC) of clients.

Additional Services
Tube swaging, elbows, bends (90° / 180° or as per client s design).

Quality Tests
The Square or Rectangualr H Finned Tube quality is assured by hydrostatic or pneumatic tests, eddy current tests and tensile tests in order to verify the mechanical bonding between inner tubes and outer fins.

Surface Coating
Outside-Red oxide zinc phosphate primer and inside volatile corrosion inhibitor (VCI) in water soluble tablet form.

Delivery Condition: Tube ends are square cut, free burrs, internally dried and air blown clean, externally coated with varnish at both ends of Square or Rectangualr Fin Tube.

Applications:

1. Economizers ,
2. Heat exchangers
3. Marine boilers

Applications:

1. Economizers
2. Boilers
3. Heat exchangers

Specifications:

Why we choose HH welding fin tube: High efficiency, minimum power loss, easy cleaning.

Competitive Advantage:

1. We have more than 10,000 square meters workshop, including 6 H-FIN or HH-FIN TYPE finning machines, daily extrusion capacity up to 20 tons.
2. Shanghai Port is our nearest seaport and airport, less than 2 hours drive away from our workshop, convenient transportation.
3. The Square or Rectangular HH Fin Tubes are the preferred tube choice for high pressure boilers.
4. Fins can be manufactured by stamping process in almost any shape and size.
5. In-line fin and tube spacing allows for cleaning with excellent choice in sooting or fouling atmospheres.
6. Fin height and spacing are limited only by heat transfer considerations.
7. Fins and tubing can be similar or dissimilar metals.