Sweco Fab, the ASME fabrication shop of Piping Technology & Products, Inc., specially designed and manufactured two 20″ OD x 36″ long, suction strainers for a chemical plant in Louisiana.
The strainers, which were fabricated from SS32, each weigh 1,300 pounds. They were designed at 300 psig and 600° F and built to ASME code. In order to insure quality of the welds, PT&P’s Q.C. inspectors 100% x-ray tested butt welds of longitudinal seams and circumference seams, head to shell. Other pressure containment welds were dye penetrant examined. The unit, as a whole, was hydrotested at 390 PSIG.
Learn more about other Sweco Fab Inc. products in our webinar archives.
Constant Spring Hangers with Loads up to 105,000 Lbs.
Piping Technology & Products, Inc., custom designed and fabricated a collection of constants for an oil refinery in New Jersey. This application required the use of suspended constants, 100-C and base constants, 200-F.
Constant Spring Hangers with Loads up to 105,000 Lbs.
In order to support the lines at the oil refinery, PT&P designed the 100-C constant spring hangers (vertical constants suspended from beams) at two different loads and total travels. The 100-C constant with a load of 105,000-lbs. and total travel of 6″ (figure 1) is set to travel 1-3/4″ down and 1-15/16″ up. It is 38-3/8″ in width, 79-1/4″ in height and furnished with a double lug suspension to allow it to hang from a double point suspension beam.
In comparison to the aforementioned constant, this particular 100-C constant spring hanger (figure 2) has a load of 33,000 lbs. and a total travel of 4-1/2″, 3/8″ up and 1-1/2″ down. This specific constant is 24-1/4″ in width, 71″ in height and also furnished with a double lug suspension to suspend from a double point suspension beam. Although the dimensions of these two constants are similar, the size of the springs and cams are very different.
Opposed to the 100-C constant, the 200-F constant spring hanger is a horizontal constant used to support piping from below. These 200-F constant spring hangers were designed with loads of 40,750 lbs. and total travels of 4-1/2″, 3/8″ up and 1-3/4″ down. These constants will be used in conjunction with sway struts to support pipelines at the oil refinery.
Learn more about constants spring hangers by visiting our website archives!
1,000 Standard Pipe Supports for Corrosive Environment
Piping Technology & Products, Inc., designed and fabricated over 1,000 standard pipe supports for a chemical agent disposal facility. These supports are to be used in a corrosive environment, therefore a unique, off white coating known as chemical resistant epoxy was used to cover the carbon steel, structural members.
The hardware was hot dipped galvanized, but in some cases, the u-bolts were coated with neoprene. Frames, guides, cantilever and axial stop supports comprised of the bulk of the material, however other support assembly components included rod hangers, clamped shoes and riser clamps.
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PT&P Utilizes 3D-Modeling Technology to Design Pipe Supports for a 750MW Power Plant
3D-DesignPipe Supports on Shipping Floor
Piping Technology & Products, Inc. recently designed and fabricated 9 pipe supports with loads up to 75,000 lbs. for a 750MW power plant in Alabama. After extensive engineering hours and structure analysis, PT&P’s engineering department produced a detailed design and 3-D model for the supports that would allow them to run electronic interface checks. The supports are to support the cooling towers’ circulatory water system at the power plant. Six of the 9 supports were designed for a 60” line and 50,000 lb. load, and the remaining 3 were designed for a 78” line and 75,000 lbs. of load.
Furnace Springs Versus Standard Springs The major differences between standard springs and furnace springs are their construction and intended use. Furnace springs operate in much the same way as other variable spring supports. They are designed to support the pipe and tubes that are subject to vertical thermal movement. The design changes come about because, furnace springs are exposed to extreme temperatures.
FURNACE SPRINGS
STANDARD SPRINGS
COATINGS
Red oxide primer in order to aviod potential hazards when exposed to high temperatures
Hot dipped galvanizedwhich tends to melt the zinc coating. Molten zinc can damage surrounding pipe and equipment.
CONSTRUCTION
Unique to its application and intended use
Welded design for housing assembly
Centers the spring coils within the housing and accommodates lug attachments
Interchangeable
Bolted configuration for the housing
DESIGN
Spring used as a means to determine the loading of the catalyst tubes
Piping Technology & Products, Inc., designed and fabricated a Figure 700 chrome-moly shoe for an 18″ pipe used to support high temperature lines at a power plant in Mexicali, Mexico.
The shoe’s length is 12″ and the pipe centerline distance was maintained at 17 3/8″ from the bottom of the shoe. The clamp was designed at 1065°F and the load was designed for 6965 pounds. The base and clamp plates are made of A387 GR.22 plate material and the u-bolt parts are made of A193 GR.B7 bar stock.
Want to learn more about chrome-moly shoes and other products from Piping Technology and Products? Visit our webinar archives today!
400 Lightweight, Vertical Constant Load HangersConstants in the Field
Piping Technology & Products, Inc. specially designed and fabricated four hundred 100-C, vertical constant load hangers for a plastics plant in Texas. The constants will be used to support a furnace standing three levels high.
In the plant, thirteen single beams confined to limited space will each hang thirty constants, therefore PT&P engineers were required to design the constants to weigh less than 150 pounds. The 136-pound constants with travels of 10 inches upward and a supporting load of 950 pounds, are 33 7/8″ in height and 8 7/8″ in width. They are also supplied with shop prime, painted finish to safeguard against the extremely hot temperatures of the furnace area. In order to insure quality and proper operations of the constants, a prototype was built and tested to MSS standards.
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Piping Technology & Products, Inc. custom designed and fabricated a 66-inch diameter, three-bolt pipe clamp for a chemical company located in Deer Park, Texas.
The clamp will be used in conjunction with a PT&P Spring Hanger and a length of rod in order to support the pipeline. After formation, the clamp’s dimensions measured at 97.75 OAL and 69.5 at its widest point. By using a FEA program, the clamp was designed for an operating load of 24,000 pounds at 500° F. The materials used consisted of 1 ¾ x 10 x 128 ¼ thick A-36 Carbon steel, with three 2½ studs and nuts.
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Piping Technology & Products, Inc. provided 35 stainless steel stanchions for pipe sizes 4 to 18 inches for a power company in Alabama.
The ends of the stanchions have shop-cut end connections that will allow field welding without any modifications by site personnel. Some stanchions were provided with straight pipe connections and others were provided with elbow connections. The minimum height requirement provided for a centerline height equal to approximately 16″ while the maximum pipe centerline was required to be at approximately 58 ½”. The stanchions were designed at 1100°F and sustained a maximum design load of 18,000 pounds. The stanchion base plates are 304 stainless steel and the tubes are constructed of A240 GR.304 seamless pipe.
Do you need stanchions for your company? Request a quote and get a response within 48 hours!
Piping systems are used to transport gases, liquids and suspended solids between units of a plant. The temperatures of the contents and the pipe when the plant is in operation are often quite different from the ambient temperature of the surroundings. The heat transferred during changes in temperature causes metal pipe to expand and contract. Piping designers must provide for movement due to temperature changes and forces caused by pumps, gravity and other elements of the piping system.Read PT&P’s “How to Size a Spring Hanger” Technical Bulletin for more information.
PT&P Specially Designs and Fabricates Constants for a Radiant-Tube Support System
These constants are an essential component of the radiant-tube support system for a reforming furnace. Piping Technology custom designed these units to fit in the limited space available inside the furnace. The bolting patterns for the constants needed to be flexible enough that they could be attached to the supporting structure with any of the support system designs being considered.
Slide Plates: The “Sandwich” Concept
Piping Technology & Products, Inc. uses the “sandwich” concept when applying slide plates to our customers ‘ systems. Figure 1 shows a “sandwich” composed of two identical slide plates, one on top and another on the bottom. Each slide plate (which is like the bun of the “sandwich”) and a low coefficient of friction material which is bonded to the metal backing plate.
Figure 1
Figure 1
In a typical application a slide bearing plate is welded to a structural steel member which is strong enough to provide the required support, but whose coefficient of friction is too high.
Figure 2
Figure 2 shows an application in which a slide bearing plate is welded on top of one steel beam supporting the other beam. When the top beam moves (due to thermal expansion, for example) it slides across the surface of the bearing plate without contacting the supporting another beam. To return to our “sandwich” metaphor, the top half of the “sandwich” is bonded to the sliding beam, and to the bottom half to the supporting beam.
Want to learn more about spring hangers? Visit our webinar archives today!
Piping Technology & Products, Inc. specially designed and fabricated ten sway braces, with total travel distance of 14, for a petroleum company in Louisiana.
The standard PT&P braces have springs that allow 3 of total travel distance. These sway braces were custom designed to provide total travel distance of 5 and 14. The center-to-center dimensions ranged from 92¼” to 115″ with internal supports to prevent buckling. The desired spring rates for the sway braces were 450 lb./in. and 1350 lb./in. The custom sway brace assemblies comprised of pipes (for spring housing), springs (sizes dependent on spring rate and total travel) and in some cases, ball joints.
Do you need sway braces for an upcoming project? Request a price quote today!
