Sweco Fab, Inc. (a division of PT&P) custom designed a transition piece weighing 6,000 lb. for a facility in Texas. The piece measures 48″ x 72″ x 72″ and is fabricated from carbon steel. It will be used to connect a round water tower to a square duct. Prior to shipping, the product was 100% dye penetrant tested.
SWECO Fab, Inc. designed and fabricated this transition piece for an ammonia plant in Egypt. The bottom rectangular flange measures 159″ long and 60″ wide. The top duct assembly has an outside diameter of 90″. The entire assembly measures 48″ high. The transition piece is fabricated from ASTM A516-70 carbon steel. It is used to connect a circular duct to a rectangular duct.
Sweco Fab, Inc. recently designed and manufactured a 1,900 lb. transition piece for an olefin site at Chocolate Bayou on the Texas Gulf Coast. The product transitions from round to oval and is made of 36″ half pipe construction. The piece measures 36″ x 72″ x 60″ and is constructed of carbon steel. The transition piece will be used to regulate the flow of both air and liquid. Prior to shipping the product was hydrotested to guarantee quality.
PT&P Manufactures Custom Designed Embed Plates for Gold Mine in Cajamarca, Peru
Piping Technology & Products, Inc., designed and manufactured 150 special embed plate pieces for Latin America’s largest gold producer. This project involved the production of one hundred fifty, 93″ x 27″ x 1″ embed plates which required the use of 80,000 pounds of steel and anchors. The custom designed, carbon steel, embed plates are to provide stability for the feed openings of four mineshaft reclaim tunnels and are scheduled to be put to use immediately.
How to Avoid Pipe Stress
What is Pipe Stress?
“Pipe Stress” refers to piping flexibility analysis.
High Stress Locations on Pipes
High stress areas generally occur at piping elbows, tees and other branch connections. The B 31.3 Piping Code provides stress intensification factors for such locations. Computer piping programs generally do piping flexibility analysis for those other than very simple systems.
Signs of Pipe Stress
An overstressed system could fail by fatigue, leading to a crack, buckling of the elbows, or overload on equipment nozzles.
How to Reduce Pipe Stress
High stress should be uncovered in the design stage. However, existing systems can be checked for incipient cracks by x-ray, ultrasound, acoustic emission or dye penetrant. Also, rerouting the pipe can provide more flexibility and sometimes reduce high stress. When rerouting is impossible or not practical, then pipe stress can be reduced significantly by adding Bellows Expansion Joints. Any sections of the pipe showing cracks must be replaced.
Product of the Month
(at left)47.25″ I.D. x 23.625″ I.D. 5A516-70 Transition Pieces w/ 5A36 stiffner for ethylene plant in Saudia Arabia. (at right)47.25″ I.D. Universal Expansion Joint w/ SB443 round corners bellows, and SA516-70 flanges for ethylene plant in Saudia Arabia.