Type F Variable Springs With Specially Made Locking Devices
Piping Technology & Products, Inc. specially designed twelve Type-F variable spring hangers (4-160-F, 8-170-F, 8-180-F) for an oil refinery in Indiana. These variable spring hangers were custom designed to support a Hydro-Test load 4.5 to 5 times the design load, which ranged from 7,988 lb. to 13,075 lb. The spring rates of the variable spring hangers ranged from 500 lb./in. to 750 lb./in. with travels of 1.15″ to 2.82″, upward movement respectively. The locking devices for these springs were manufactured using basic materials (rods, hex nuts and heavy pipe wall) and a special pressure plate to accommodate the application design criteria requested by the client. The base plate designed for these F- Type cans were modified to accommodate the locking devices.
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U-Type and F-Type Constant Spring SupportsF-Type Constants
Piping Technology & Products, Inc. designed, manufactured and delivered a total of 8 constants to a power plant in Mexico. The designs consisted of 4 Horizontal U-Types Upthrust (Figure 1) and 4 Vertical F-Types (Figure 2) that are to support 24-inch diameter pipes. Each consisted of different sizes. The constants are designed for loads of 2,839 lbs. to 8,963 lbs., for Total Travels ranging from 7 to 3 inches. Constants were painted CZ-11 per customer request.
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Custom Pipe Support Assemblies For An Oil Refinery In MexicoCustom Pipe Support Assemblies
Piping Technology and Products designed and built 24 custom pipe support assemblies to meet the unusual needs of an oil refinery in Mexico. The pipe hanger assemblies each consisted of a 200 E-type constant spring support and a cradle assembly. The constants are designed for loads of 9856 lb. to 13,288 lb., and for total travels ranging from 3.5″ to 5.5″. Operational conditions dictated that the constant springs have settings for emergency and start-up, in additional to the standard settings of cold for shipping, and hot for normal operations.
The cradle assemblies attached to the constants are to support pipes with operational temperatures of 1070°F to 1100°F. Thus while the constants could be made of A-36 steel, the assemblies could not. The pipe saddle itself was made by splitting a section of A387-11 chrome alloy pipe. The other support components were all made of 304 stainless steel. This includes a 1-3/4″ Eye Rod, two 27″ I.D. U-bolts, and two 33″ lengths of 3″ diameter SCH. 80 pipe.
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Piping Technology & Products, Inc. designed and built two, 68″ in height 100 U-Type constants for a power plant in Mexico. The vertical upthrust constants were designed to support 48,500 lb. each with a total upward travel of 3″. In order to prevent buckling of the constant housing, each constant was designed with five C7 x 14 3/4 lb. channels and a base plate of 26 3/8″ x 33 1/4″. These unique 100 U-Type upthrust constants were custom designed by PT&P to accommodate limited horizontal space requirement. The constants will be placed opposite to each other on a beam capable of supporting 99,000 lb. load of the pipe, plus the weight of the constants.
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PT&P specially designed two Type “B” variable spring hangers (2-250-B) for an oil company in Ryazan, Russia. These variable spring hangers were custom designed to support a load of 60,000 lbs. with a spring rate of 3,648 lbs./in. respectively. Due to loading requirements, these variable spring hangers were also designed to accommodate a travel of 1″, upward movement.
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PT&P custom-designed and built four big ton D-upthrust constants (figure 1) and two pairs of big ton T-upthrust constants (figure 2) for a global engineering & construction company.
These upthrust constants are installed at a petrochemical plant in Siberia. Due to space limitations, the big ton D-upthrust constants and big ton T-upthrust constants were designed for a total travel of 5″ and 4″ respectively. The big ton D-upthrust constants were also designed for a load of 50,022 Ibs with a height of 26 inches. The big ton T-upthrust constants with a height of 16.5″ were designed for 75,000 Ibs, and 67,464 Ibs respectively.
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Piping Technology & Products, Inc. and its 24×7 Quick Turn/Emergency Service were put to the test on a Friday evening when they received an emergency call from a company located in Jamaica. The Jamaican company was concerned with existing pipe supports at their location and made a request for a PT&P field services representative to visit and inspect.
An experienced PT&P field services manager arrived at 8:00 p.m. on Saturday to survey and fulfill the request.
The reported problem was a pair of rusted and decayed spring hangers dating back to 1969. After inspection, PT&P’s field services manager concluded that the aged spring hangers could no longer support the piping system due to changes in the design of the system, whereas, failure resulted in additional forces being exerted onto the steam turbine.
Following identification of the measurements, load capabilities, and movements of the spring hangers, it was apparent that the system design did not compensate for the weight of two globe valves that were added to the system at a later date. Thus, PT&P’s field services manager had to take into consideration the weight of these two globe valves when sizing the replacement parts.
PT&P supplied and delivered two Type G variable spring assemblies to Jamaica on the following Monday. Type G assemblies can accommodate unusually heavy loads, and is especially adaptable for avoiding interference in spaces where headroom is limited. In this case, the spring assembly was supporting loads in excess of 2000 lbs. and movement was limited due to its location in the powerhouse.
A large refinery plant located in Pasadena, TX called upon Piping Technology & Products, Inc. to aid them in the immediate replacement of a 5400 Lbs, 7 1/2″ travel vertical constant spring hanger used to support a Coker drum.
The constant spring hanger was damaged during servicing. The reliability engineer from the refinery contacted PT&P Wednesday evening to request an inspection by a PT&P field services representative. The following morning PT&P’s field services representative arrived on-site, inspected the damaged constant spring hanger and suggested that a replacement would be most efficient and cost effective. With the existing nameplate bolted to the constant, PT&P was able to easily locate the original design of the constant.
The original design, along with the convenience of the component parts being in stock inventory, allowed PT&P to quickly manufacture a replica of the constant and ship it out on the same day by 6 p.m.
In the past, lead times for delivery of constant supports averaged 6-8 weeks, however, through the process of maintaining stock components of interchangeable parts, lead time has been drastically reduced. Piping Technology & Products, Inc. maintains a large inventory of stocked constant support assembly components that allows them to quickly assemble and ship to customers on demand, especially in emergency/quick-turn situations.
Piping Technology & Products, Inc. supplied a variety of pipeline products for the construction of a refinery plant on Jurong Island, Singapore. Jurong Island is a man-made island consisting of four petroleum refineries, 30 petrochemical firms, and many more industrial firms to support its existence.
PT&P Aids in the Creation of a "Chemical Island" in Singapore
PT&P and U.S. Bellows, Inc. first became involved in this extensive project in May 1998. During this time, PT&P supplied the international construction firm with more than 3,000 cold shoes, 400 slide plates and numerous more spring hangers, constants and fabricated pipe supports. U.S. Bellows, Inc., a wholly owned subsidiary of PT&P, also supplied many of the expansion joints used in the creation of this refinery. This includes three 36″ expansion joints were fabricated and sent to Singapore in October 1999. Two years, 300 jobs, and 670 tons of steel later, PT&P completed the last job for this project in September 2000.
PT&P Aids in the Creation of a "Chemical Island" in Singapore
PT&P has extensive experience performing product testing to ensure product quality and dependability. For this particular project a load test was performed on a 60″ diameter cold shoe. By measuring the axial and lateral loads, vertical tension and temperature, PT&P engineers are able to determine its maximum load.
Product testing was also performed on the three 36″ expansion joints provided. The bellows together with the hinge assembly were hydro-tested and a dry nitrogen test between the two plies was conducted to ensure that they would withstand the design pressure. These expansion joints were tested per ASME Sect. VIII Div. 1 Appendix 26 standards.
Specially Designed Spring Supports Ready for Shipment to Egypt
These supports are key components for the steam generators in a thermal power plant. The coils are coated with neoprene (black) to prevent corrosion while the steel plate and tie rods are painted white. Engineers of Piping Technology & Products, Inc. designed these units to support loads of 110,000 kips.
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