PT&P designed twelve constant spring support assemblies for a chemical plant in New Jersey. The assemblies will be used as replacements in a recuperator "up-leg" and "down-leg" application in conjunction with custom cross-over supports previously fabricated by PT&P. Physical sizes of these constant assemblies range from 18-1/2" x 22" x 64" to 18-1/2" x 26" x 83". Operating loads range between 8,000 lb. – 19,000 lb. and each allows for upward movement between 6" – 9". The spring coils are coated with epoxy instead of the standard neoprene coating. Standard load and travel tests were completed prior to shipment.
Constant spring supports find applications in various fields and can be made from diverse materials tailored to specific end applications. These supports are integral in industries such as petrochemicals, LNG, refining, power generation, steel mills, and geothermal plants, among others. In the past, obtaining a custom-designed constant spring support posed a significant challenge in terms of both design and manufacturing, with lead times extending to a minimum of 6-8 weeks.
Through a dedicated focus on manufacturing optimization and employing a design-centric engineering approach, we have successfully reduced the required manufacturing time by more than half. Now, the process of acquiring custom constant spring supports is significantly streamlined. In fact, we are capable of fulfilling emergency orders in less than 24 hours, taking into account the client’s location and urgent requirements.
Piping Technologies & Products fabricated these special designed Split-T pipe shoes using a Figure 50 “two-bolt pipe clamp” with added gusset plates welded beneath the clamps for a refining project in Saudi Arabia. The gusset plates are added to increase the vertical load-carrying capacity. The pipe shoes are 4″ height x 15.5″ wide x 18″ long and were fabricated from A36 carbon steel with a hot-dipped galvanized finish. They are designed for a pipe size of 14″ with an operating temperature from -29°C to 316°C. The pipe shoes are capable of supporting an operating load of 34,000 lb.
We provide such products in a “clamp-on-shoe” configuration to meet the needs of client applications where welding the pipe shoe onto the process line is prohibited. Depending on the client’s specifications, we can design and manufacture these shoes without a finish (black) or various painted finishes in place of hot-dipped galvanizing to expedite the delivery of the order. We can manufacture these clamp-on-pipe shoes with different metallurgies, such as 304 or 316 stainless steel, to accommodate high temperatures or cryogenic applications depending on the project’s needs. This basic pipe support is used in industries ranging from automotive, petrochemical, LNG, and refining in almost every major processing unit to maintain pipe elevations and handle loads imposed by media movement.
PT&P custom designed insulated supports for a cryogenic pipeline at an LNG facility in Australia. They are fabricated with 304L stainless steel plates and Micarta® G-10 insulation. Micarta® is designed to prevent LNG temperatures of -320°F from transferring to the base and surrounding pipe rack steel. The base plates are fabricated from carbon steel. These pipe saddles are designed to support pipes with dimensions ranging from 12″-18″ in length, 6″-15″ in width and 6″-40″ in height. The nominal pipe size range is 8″-24″ diameter. MTR’s were provided and non-destructive testing (PMI) was performed, along with standard Q.C. inspection prior to shipment.
As a key partner for many LNG projects globally, a number of our designs and products have been installed in various parts of the LNG facilities. They include:
Bird Screen
Constant Assemblies
FEA/Engineering Services
Expansion Joints Metal Bellows
Fabricated pipe shoes, guides, anchors
Field Services
Flanges, Strainers, paddle blinds, bleed rings
Hold-down clamps
Misc. Steel fabrication
Orifice plates
Pipe Hanger Hardware
Restriction orifice plates
Slide bearing plates
Snubbers/Sway braces/Sway struts
Spray Nozzles
Varibales Assemblies
Wear Pads
Troughs and Shrouds
Instrument spports
Portable Hinges/Manways
The current LNG production climate has had significant growth driven by increasing global demand for cleaner energy sources. Major LNG-producing countries, such as the United States, Australia, and Qatar, continue to invest in expanding their liquefaction capacity to meet this rising demand. Advancements in technology and innovation improve the efficiency and cost-effectiveness of LNG production. We have been a part of these efforts because of our breadth and depth of experience in LNG. Most recently we completed design, manufacture, and delivery of over 200 LNG troughs over 40 feet long to meet the newly established FERC requirements around spillage.
PT&P custom designed and manufactured ten 200 U-Type constant spring supports with slide plates for an Oil Refinery in Texas. They are fabricated from A36 carbon steel with an HDG finish for plates, angles, and cans. Its dimensions are 31" in height and 52" in length with 19" in width. They are designed for a movement of 3 ½" up to 9 ½" and an operating load of 1100 lbs up to 4800 lbs. They were custom-designed to match the box dimensions of a competitor. The units had a Standard Load Test performed prior to shipment.
Constant springs are sometimes installed near rotating equipment such as pumps and compressors used in manufacturing, mining operations, utilities, oil and gas extraction, and cross-country pipelines. By providing constant support to piping leading to rotating equipment subject to both vertical and horizontal movement, these types of spring hangers help to decrease stresses imposed on rotating equipment, thereby extending the life of the bearings and seals within these units.
For this application, our constants were designed and manufactured with carbon steel; however, depending on application requirements, such as a furnace, we can also provide constant spring supports utilizing stainless steel material, which accommodates high temperatures and corrosive environments. We created the world’s smallest constant spring support. Our nano constant is ideal for such applications:
These compact spring supports were custom-designed to support a heat exchanger at an oil refinery. They were designed to support loads up to 12,000 lb. and a movement of 0.039", with space limitations of 3"in height. These compact springs are fabricated from carbon steel and utilize engineered Belleville (disc spring) washers. 25% glass-filled (PTFE) slide plates are bonded to the top of the load flange and provide a low coefficient of friction. The DST Compact Spring Support is specifically designed to relieve excess loading on process equipment. Benefits: Minimizes excessive loads on sensitive equipment, same load for smaller working range (25-50% less space), ideal for locating under equipment flanges & reduces design time, maintenance cost and accidents.
Heights up to 12-3/4”
Spring Casing Diameters from 6-5/8” to 8-5/8”
Base plates from 9″x 9″ to 13-1/4” x 13-1/4″
Design:
Operating Temp.: -49°F to 122°F
Operating Loads from 697 lb. to 6093 lb.
Movements of 0.04″ to 0.2”
Material:
Hot-dipped Galvanized Carbon Steel
Testing:
Load & Travel Test | Q.C. Inspection
Piping Technology and Products, Inc. recently designed and manufactured F-Type variable spring supports with internal load columns for a petrochemical plant in Canada. The variables are fabricated from carbon steel that is able to accommodate low temperatures (A516-GR. 70N). The operating temperature ranges from -49°F to 122°F while supporting operating loads from 697 lb. to 6093 lb. and movements of 0.04″ to 0.2″. They are designed to accommodate installed heights up to 12-3/4″, with spring casing diameters from 6-5/8″ to 8-5/8″, along with base plates from 9″x 9″ to 13-1/4″ x 13-1/4″ for installing either by bolting or welding in the field. Load and travel tests, along with visual Q.C. inspections were performed before shipment.
Variable supports are typically used for the following considerations in piping systems:
Compensating for Thermal Expansion
Maintaining Stress and Load
Installation in Piping Systems
Maintenance
Supporting Heavy Loads
Variable spring cans play a crucial role in maintaining the integrity and stability of piping systems by compensating for thermal expansion or contraction, supporting heavy loads, and allowing for vertical movement. They are essential components in industries such as petrochemical, power generation, semiconductor, refining, paper and pulp processing, and other applications where large-scale piping systems are employed.
Variable spring cans come in a variety of designs and are constructed using different materials to suit specific applications and environmental conditions. Materials commonly used for variable spring cans include carbon steel, stainless steel, and special alloys. The selection of materials is crucial to ensure that the device can withstand the corrosive effects of certain fluids or harsh environmental conditions.
31″ up to 148″ pin-to-pin and cylinder diameters from 2.5″ to 5″
Piping Technology & Products designed these hydraulic snubbers for an ammonia plant in Louisiana. The snubbers ranged in length from 31" up to 148" pin-to-pin and cylinder diameters from 2.5" to 5". They are designed for an operating load ranging from 3,000 lb. to 15,400 lb. and have a 5" to 12" stroke. Hydraulic snubbers are designed to protect the piping system when a sudden, heavy load is applied (such as an earthquake of high intensity), which can cause serious vibrations leading to damage and possible failure of the piping system.
Most hydraulic snubbers have a piston which is relatively unconstrained in motion at low displacement rates. At high displacement rates the piston "locks up", that is, the force required to move the piston increases substantially, usually as a result of the closing of a valve.
Hydraulic snubbers are used in many applications and are typically needed urgently in operational facilities. We have provided these products in all major verticals including refining, petrochemical, renewables, and power operations.. Our hydraulic snubbers are built in accordance with ASME Boiler and pressure vessel code and our Laconia, New Hampshire operations have ASME Nuclear Stamp "NS" for nuclear applications.
A total of eight big ton spring supports, “Mega Tons” were designed and manufactured to support two reactors in a power plant weighing approximately three million pounds each. The mega ton pictured incorporated eighteen individual spring coils to produce a load capacity of approximately 602,000 lb. and a spring rate of 112,500 lb./in. It was designed with eight Bronzphite® slide plates that measured 12″ x 12″. The 12″ x 12″ slide plate selection was based upon the ability to position individual squares across the load flange surface while simultaneously providing the total slide plate surface area required to support the operating loads.
By using individual slide plate squares, the fabrication and assembly time was reduced because a standardized mounting procedure could be incorporated and repeated as necessary for each big-ton load flange subassembly. Overall, the slide plates were incorporated into the design to reduce the horizontal forces which would be imparted onto the big-ton spring’s load flange during lateral deflection (movement) of the reactor.
Bronzphite® slide plates, in particular, were selected because these big-tons will be used in a location which will see continuous “cold-to-hot” operating cycles and as a result, the robust nature of Bronzphite® proved more advantageous than other types of slide plates. The other two designs used nine slide plates, one with fifteen individual coils to produce an operating load of 594,000 lb. and a spring rate of 250,050 lb./in. The other design had an operating load of 285,000 lb. and a spring rate of 106,000 lb./in.
In addition to designing and manufacturing the Mega Ton spring supports, we were tasked with testing them to confirm they would operate in the actual conditions for which they were designed to operate at the requested loads. Therefore, we custom designed and manufactured a test apparatus and incorporated the use of a special load cell to ensure proper operation throughout the entire working range of the coils. The “mega tons” were then set to the cold (installed) load as specified. Testing was developed and done by our in-house manufacturing, quality and engineering teams.
PT&P designed and manufactured 157 embed plates for a construction company in Texas. Embeds are essentially anchor bars used to secure steel to the concrete. The plate is ¾” x 14″ x 18″, and the Nelson studs are ¾” x 7″. All components are fabricated from carbon steel with a hot-dipped galvanized finish. Visual and Q.C. tests were performed prior to shipment. This job was a 15-day turnaround in order to meet the customers’ construction schedule.
Embeds are usually set in concrete foundations, floors, or piers and are a key component in the construction industry for connecting steel to concrete. Virtually all “grass-roots” projects such as chemical, power, refinery, solar, food processing, mining, and green energy plants contain embedded steel as a part of its foundation. These can also be used in automotive, semiconductor, and now battery plants. We have the ability and knowhow to custom manufacture various sizes, types and can utilize different materials to meet our client specifications.
Our Houston based manufacturing operations allow us to meet tight delivery schedules at most project job sites allowing for cash flow management of the project and substantially reduced supply chain risk. Typically embeds and anchor bolts have time criticality considerations because the concrete construction teams must mobilize in a timely fashion so logistics and cost can be managed effectively.
Operating Temp.up to 1800°F
Operating Loads up to 1000 lb.
Movements of +/- 4-1/2″
Testing:
Standard Q.C. Inspections
Pipe Shields, Inc., a division of PT&P, custom-designed insulated pipe supports for high temperatures in a chemical plant. These "hot shoes" are fabricated from A36 carbon steel and include a hot-dipped galvanized finish. They range in nominal pipe sizes from 1" to 3" and include 1"-2" thick calcium silicate insulation. The supports are designed for an operating temperature up to 1800°F and operating loads up to 1000 lb, with +/- 4 -1/2 movement. Quality control inspections were performed before shipping to Indiana.
Pipe Shields Inc. pioneered the design and manufacture of pre-insulated pipe supports, slides, guides and anchors and is a subsidiary of Piping Technology and Products, Inc. Our products are ubiquitous, serving diverse industries including hospitals, airports, semiconductor plants, automotive plants, EV battery plants, data centers, pharmaceutical plants, food processing, petrochemical plants, and power and renewable energy plants sometimes used in cold service lines and some dual temp lines between TCUs (temperature control units) and reactor jackets. Engineers often specify Pipe Shields and PT&P products as the foundation for designing various piping systems.
Last year we built over 50,000 units of this kind of support in our Houston-based manufacturing facility. We were the first in the industry to employ the use of high-speed manufacturing automation to facilitate the cutting of the high-density calcium silicate to meet tight deliveries required for the projects. The advent of computer-controlled cutting equipment has improved how we do things at PT&P. Integrating these advanced technologies has led to significant improvements in manufacturing processes, enabling unparalleled accuracy in cutting high-density insulation. Computer-controlled cutting equipment allows for intricate and complex designs that were once challenging or impossible to achieve manually. Automating cutting processes has not only reduced human error but also enhanced productivity by accelerating production speeds. Moreover, these systems provide a high level of repeatability, ensuring consistent quality across multiple iterations. Another benefit was that we were able to reduce the material waste generated by human cutting by roughly 10-15%, which allowed us to remain price-competitive on a global scale.
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