Category Archives: Steel Stringers

Curved Steel Spiral Staircase at Tommy Bahama Waikiki, HI.

Albina recently bent very large HSS (Hallow Structural Steel) rectangular tubing 16″ X 4″ X .500″ WALL A500 GR B for an elliptical staircase at the Tommy Bahama Restaurant & Bar at The Shops at Mauna Lani in Waikiki, Hawaii.

Upon extensive review of the plans submitted to Albina for production, it was determined that some radius changes were required. Many of the original radii required were actually deemed “too tight” to bend. Original plans called for bends that were as tight as a 3’-8” Centerline Radius. To remedy this problem, Albina was able to provide suggestions and recommendations regarding the radii that we were able to successfully bend while maintaining a high level of AESS (architecturally exposed structural steel) quality.

This was a unique project because the stringers, as detailed, included numerous different radii. Many stringers are designed with a single radius or just a few radii. This staircase was originally designed with such complexity that it would have been fabricated from 38 individually bent members. Albina’s suggestion to decrease the actual number of parts and instead “blend” some parts together helped simplify the bending process, and reduced the total number of full-penetration weld splices that customer would need to perform during fabrication. After much discussion, the staircase was redesigned, resulting in only 24 individual members (a 37% decrease in the number of bent parts and full penetration weld joints). These changes resulted in a quicker lead-time and a labor cost savings.

After receiving the elliptical bends from Albina, the customer commented, “Albina worked with us on time frames and cost issues. Albina must roll these pieces perfectly or we can’t even attempt to get a finish product on this end. We are counting on these things being correct…period. Albina is not afraid to take the risk of rolling a radius that hasn’t been done before. I appreciate the consistent and un-prodded reports on job status and progression.”

Curved Steel Staircase Tommy Bahama

Curved Steel Staircase Tommy Bahama

Curved Steel Staircase Tommy Bahama

Curved Steel Staircase Tommy Bahama

Rolled Plate Creates Spiral Stair Stringers

Albina Co., Inc. recently rolled steel plate to create the spiral stair stringers for a beautiful custom curved steel staircase in California. The plate sections consisted of 1/2″ x 14″ A36 plate rolled counter clockwise to a 38′ 8″ radius and 43′ 9″ radius. For portions of the landing area, 1″ X 14″ A36 plate was rolled anywhere from a 37′ 7″ radius to a 42′ 6″ radius. Various other structural steel members were bent including 4″ X 4″ X ¼” ANGLE A36 rolled legout to a 37′ 6″ radius.

steel spiral stair stringers from rolled plate

steel spiral stair stringers from rolled plate

steel spiral stair stringers from rolled plate

steel spiral stair stringers from rolled plate

Spiral Bending of Structural Steel is a Booming Market

Why Choose Albina as your Spiral Bender?

  • Albina doesn’t split HSS prior to bending and then weld the sections back together to meet your needs, our HSS members are bent as HSS members.
  • Albina doesn’t fill your HSS with other structural members. We are able to bend HSS members without adding extra material and weight and are still able to meet or exceed your quality requirements.
  • Albina will bend your HSS stringers out of HSS material, we don’t make “built up stringers” out of plate.

Recently Completed or Active Projects:

  • Spiral bent some ½” X 12″ A36 Plate down to a very tight 1’ 9” Inside Radius.  The bend was so complex that the customer didn’t think it was possible to spiral bend the material.  In fact, the customer thought we had rolled cylinders and laser cut out the spiral sections.

  • Just received another difficult Spiral bending project for some ½” X 14″ A36 Plate.  All material is to be bent to AESS standards, down to a 5’ 0” inside radius.

  • Just spiral bent a project including stringers, handrails and mid-rails complete.  The stringers were spiral bent out of C15 x 40# down to a very tight 5’ 2” plan diameter.

  • Albina just finished another staircase project consisting of stringers and railing.  The stringers were bent out of MC12 x 10.6# channel and bent to a 78” plan view radius.

  • We were recently awarded a project to spiral bend TS 14″ X 14″ X .500″ WALL A500 GR B material.  Project is located in the Mid-West and is all AESS quality standards (bent down to a 22 ft. radius).

Spiral Math Calculator and Social Media Tools Now Available!

Announcing more tools to make your lives a little easier! 

“Spiral Math Calculator” now available at

Visit the link, enter all of your known data, automatically calculate your Degree of Pitch and Arc Length, and save it in your files for future reference or submit a report directly to Albina Pipe Bending for bid!  It is that simple.

Albina has also joined the world of social media!

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Stainless Steel Staircase Wins a Bronze Award in the 2009 Ernest Wiemann Top Job Competition

The design, fabrication and installation of Staircrafters Inc. ultra contemporary staircase, which was supported by a single, monolithic stringer bent by Albina Pipe Bending Co., Inc., won a bronze award in the 2009 Ernest Wiemann Competition. The massive staircase contains 4,000 pounds of stainless steel, and is made from over 300 parts.  The most striking feature of the staircase is the giant stringer bent by Albina Pipe Bending Co., Inc., which curves elegantly between the first and second floor.
Since the customer requested fabricated stringers instead of true HSS, Albina Pipe Bending Co., Inc. bent and fabricated the TS 10″ x 6″ x .250″ wall T304 stainless steel stringers out of 10″ x 3″ x .250″ formed channel T304 stainless steel. Albina rolled and fabricated the stringers and the flat section at the top of the staircase.  The curved stringers were bent to a 117″ center line plan view radius. All welds were ground smooth and the surface finished and polished to provide the appearance of a true seamless stringer.  All work was done to the highest of AESS standards.