Piping Technology & Products custom-designed constant spring supports for crude oil processing at one of the largest refineries in the world. Petroleum refineries change crude oil into products such as jet fuel, gasoline, polypropylene, polyethylene, propane, sulphur, carbon black feed, and diesel that can be used for transportation, heating, feedstocks for making other chemicals, generating electricity, renewable energy, and paving roads. Piping Technology and Products was awarded this project because we were the only engineering manufacturing firm vendor of constant spring manufacturers in the world that could both design, manufacture, and test these units for the unique design conditions. These constant springs will support loads ranging from 88,185 lb. to 143,300 lb. They are designed for temperatures up to 650°F, and movements of 0.39” up, 4.72” down, -2.36” up, and 0.39” down. The Type-C constants are 67” H x 21” W x 88.25” L and the Type-F constants are 85” H X 39.75” W x 86.56” L. The F-Type springs will include graphite slide plates and are designed to support the piping from below while allowing both lateral and axial movement. All constant assemblies underwent magnetic particle inspection of welds, travel, and compression tests. Additionally, a special “cramp test” was conducted on each spring coil. A “cramp test” is done by compressing the spring coil by a specified length for a specific period of time. This assures the spring’s functionally especially when a large “wire diameter” is used to manufacture the spring coil for these high loads. At Piping Technology and Products and our subsidiaries, we specialize in designing pipe supports, expansion joints, and insulated supports for unique applications involving products not readily available. Our products are used in the CDU (crude distillation units), hydrocracking units, RFCC (residual fluid catalytic cracking), naphtha hydrotreater, and hydrodesulfurization units (also known as alkylation unit), and sulphuric acid regeneration (SAR) units in refineries.Read More
PT&P received a rush order this past week for variable spring supports at 4:41 pm, quite late into the workday; however, this is business as usual, our manufacturing facility in Houston, TX operates 24/7 to support our customers.
In this case, the customer facility, an olefins plant was incurring a significant loss and needed to replace the springs to resume operations as quickly as possible. The seven (7) variable springs were designed, fabricated, and shipped within 2 days. The F-type variable spring support is designed to support piping from below, directly from the foundation, concrete column, or supporting structural pipe rack steel. Adjustment is made by inserting a bar into holes in the load column and turning the load column as a jackscrew. The base plate is bolted to the case and has four holes for fastening.
As global leaders in variable spring manufacturing, we used our adaptive manufacturing processes in which the PT&P pre-fabricated component parts that make up these variables are easily assembled when orders are placed. These variables were fabricated from carbon steel and hot-dipped galvanized for corrosion protection. They are designed to support loads ranging from 713 lb. to 1668 lb. and movements of 0.148” to 0.133”. Load and travel tests, along with Q.C. inspections were performed before shipment. Variable springs are used in mills, refineries, chemical, plastics, polymer, solar, power, biochar, renewables, carbon black, LNG boilers, food, packaging, and wastewater treatment plants to support piping as it goes through its’ range of movement.
B31.1 Operations and Maintenance
According to ASME B31.1 Chapter VII Par. 140 a program shall be established for the assessment and documentation of the condition of all CPS (Covered Piping Systems) in power plants.
CPS Systems are defined in Chapter 1 Par 100.2, as systems on which condition assessments are to be conducted. This includes the following systems as a minimum.
NPS 4 and larger main steam, hot reheat steam, cold reheat steam, and boiler feedwater piping.
NPS 4 and larger systems that operate above 750°E (400°C or above 1,025 psi (7,100 kPa)
Other systems may be included as CPS by an Operating Company, based on their judgment. Appendix V of the code is titled ‘Recommended Practice for Operation, Maintenance, and Modification of Power Piping Systems’. This addendum is non-mandatory; however many Power Industry operating companies’ insurance carriers are now invoking Appendix V with increasing frequency, and this is affecting the conditions of their agreements with the operating companies.
Piping Technology and Products Inc. (PT&P) has for some time been performing surveys and assessments in accordance with part H of Par. 140, which requires hot and cold walk-down readings and assessment of pipe supports, operated within the creep regime of the pipe. These assessments are helpful in identifying, sagging lines, deformation of supports, and damage caused by upset conditions, and/or incidents, attributable to operational malfunctions, dynamic/thermal or hydraulic events.
PT&P has been performing this service for many power generation companies. Preparation of documentation, retrieval, and compilation of files for a CPS assessment, has just been completed for a major U.S power generation company. Ten large power plants were involved, and the original predominantly high-energy pipe support drawings, all engineered and designed by PT&P, were retrieved from PT&P archives dating back ten years.
We will be happy to answer any of your technical questions about our survey capabilities, as well as any other engineering or field services that your organization may need.
PT&P custom-designed constant spring support assemblies for heat recovery steam generator at a combined-cycle power plant. These power plants utilize gas turbines, steam turbines, heat exchangers along with other components to make use of “exhaust waste” for a more efficient system. These 200-F Type constants were fabricated from A36 carbon steel and include a hot-dipped galvanized finish. The spring coils are formed from alloy steel and are neoprene coated. They are designed for an operating load for up to 886 lb., and up to 6″ of maximum travel. They are placed beneath the unit being supported and allow for movement in the vertical direction (up or down). The dimensions are 13″ W x 31″ L x 18-1/2″ H. Standard load and travel tests along with a quality control inspection were conducted prior to shipment.Read More
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.Read More
PT&P custom-designed constant spring support assemblies for an energy facility in Canada. These 100–E Type (layout B) constants were supplied with an extended hanger rod and fabricated from A36 carbon steel with 5160 alloy steel coil springs. They are designed for an operating load from 2,370 lb. to 9,240 lb., and movements from 1-1/2” to 8-1/4”. The dimensions are 12” W x12” L x 30” H and 14” W x 19” L x 53” H. Load and travel tests along with a quality control inspection were conducted prior to shipment.Read More
PT&P custom-designed U-type constant spring supports for an oil refinery in Texas. Constants can be utilized in refineries within blocks such as hydrogenation units, naphtha desulfurization units, and fluid catalytic crackers. The spring’s frame is manufactured from A36 carbon steel and hot-dipped galvanized to protect against corrosion. For instances where there was axial and lateral movement, 240 Gr. 304 slide plates were installed on the load flanges of the constants. The constants supplied are designed for an operating load ranging from 1,085 lb. up to 17,480 lb. and horizontal travel from 2.5” to 6”. The overall dimensions range in size from 17” H x 20” W x 31” L to 28” H x 26” W x 66” L. Load and travel tests per industry standards were performed prior to shipment.Read More
|Type:||Custom-Designed Constant Spring Supports|
|Size:||PTP-100 B-Type | 16” x 24” x 30”|
|Material:||A36 Carbon Steel | Hot-dipped Galvanized| Epoxy Coating|
|Design:||Load Range: 2,280 lb. to 7,143 lb. | 2″ Total Travel|
|Testing:||Q.C. Inspection | Load and Travel Tests|
PT&P custom-designed constant spring supports with assembly rods for a manufacturing company. The constants were fabricated from A36 carbon steel, hot-dipped galvanized, and painted with an epoxy coating. The assemblies are designed for an operating load ranging from 2,280 lb. to 7,143 lb. with 2” of total travel. Standard load and travel test and Q.C. inspection were completed prior to shipment to North Carolina.Read More
|Type:||F-Type Variable Spring Support Assemblies|
|Design:||Operating Loads from 3000 lb. to 4000 lb.
Movement of 1”
|Testing:||Load & Travel Test | Q.C. Inspection|
Pictured here is a Type G variable spring hanger assembly designed for an operating load up to 4000 lb. and 1” movement. This type of support assembly is formed by welding two standard spring assemblies to the ends of a pair of channels. The Type G assembly is especially adaptable for avoiding interference in spaces where the headroom is limited. The assemblies are fabricated from carbon steel and underwent spring load tests before shipment.Read More
|Type:||B-Type Constant Spring Supports|
|Size:||11-5/8 W x 41” L x 19” H to 21” W x 88” L x 38” H|
|Material:||A36 Carbon Steel | Hot-dipped Galvanized|
|Design:||Operating Load Range: 3,170 lb. to 48,400 lb.
Movement of 3” to 8”
|Testing:||Q.C. Inspection | Load and Travel Tests|
PT&P manufactured B-type constant spring supports for LNG service in Louisiana. These constants are fabricated from A36 carbon steel with alloy steel 5160 spring coils. The constants are designed for an operating load range of 3,170 lb. to 48,400 lb., and movements from 3” to 8”. They range in size from 11-5/8 W x 41” L x 19” H to 21” W x 88” L x 38” H. To avoid delivery delay, a standard frame was paired with an oversized coil and coil housing. The lugs were rotated 90 degrees from the standard to allow the hanger to swing beyond +/- 4” of side-to-side swing. Standard load and travel tests were performed prior to shipment.Read More