Special Application Variable Springs and Constant Supports
March 19, 2003
Special Application Variable Springs and Constant Supports
The three pictures above show materials being crated for shipment overseas. At the top center are pallets of variable springs designed for 10” of movement and 1000 pound load. This unusual combination of requirements is satisfied by an unusually long coil. This project required 700 of these variables. At the bottom center are constant supports designed for 14” of movement with loads near 2000 pounds. This large movement, unusual for this load, requires the large arc seen in the frame of the constant body. Two hundred of these constants were required. These spring supports are painted with a shop prime.
Do you see a need for variable or constant springs in your piping system? Get pricing today!
3 Custom Built Disc-Spring Arrestors with Clamps
February 28, 2003
3 Custom Built Disc-Spring Arrestors with Clamps
The disc-spring arrestors provide resistance by utilizing disc springs (sometimes referred to as Belleville® washers) stacked in a series within the assembly housing to produce a specific spring rate. By utilizing large (over 8 diameter) disc springs, very high spring rates may be obtained. The arrestors are capable of operating in both tension and compression.
The housing, end bracket, and extension pieces of the spring arrestor are made form A-36 carbon steel. The disc springs are made from ASTM A-1075 spring steel. One clamp (for design temp. of 688 degrees F.) was made from carbon steel and two clamps (for design temp. of 1054 degrees F.) were fabricated from A-387 GR.22 Chrome-Moly steel.
The diameter of each disc spring was 9 with a thickness of 1. The overall pin-to-pin dimension for the assemblies varied with a minimum of 35 and a maximum length of 57. The maximum length that can be accommodated is 120. The clamps were made for 18 and 30 diameter pipes.
The shock arrestor will see a maximum operating load of 43,000 lbs. The spring rate of each arrestor was designed at 40,000 lb./in. The spring arrestors are designed for a maximum displacement of 2. The arrestors were tested to verify spring rate and to confirm the operation of the pipe hanger assembly.
Do you have a need for spring arrestors or pipe clamps in your current or future project? Get pricing today!
18,500 lb. Load Constants for a Construction Site
February 21, 2003
18,500 lb. Load Constants for a Construction Site
The constants are made from A36 carbon steel and range in height from 4′-0 to 5′-0 and C-C dimension of 7′-0 to 8′-4. They have a load capacity of 12,000 lbs. to 18,500 lbs. and a 4-5 travel capacity. Load setting and travel testing was conducted on the constants to ensure they met the customer’s requirements.
Want to learn more about constant springs? View a past webinar today!
Variable Springs with Permanent Adjustment Travel Stops
February 7, 2003
Variable Springs with Permanent Adjustment Travel Stops
Piping Technology & Products designed and manufactured these variable springs with permanent adjustment travel stops for a refinery in Texas.
These types of travel stops are used to allow ease of installation, provide a means for field load adjustment within the working range of the spring, and allow the springs to be “locked” easily whenever they are taken out of service for shutdowns or refurbishment of the system.
For this requisition, a total of 23 variable springs with adjustable travel stops were fabricated. The springs are made from carbon steel and the adjustment rods are made from A-325 high strength bolt material. The springs ranged in size from PTP-1-60-F to PTP-2-180-F size spring. The largest springs were set for an operating load of 12,900 lbs. and a hydrotest load of 14,000 lbs. and a maximum travel of ½. All of the springs were tested in the load cell to insure proper operation. Per the customer’s request, these springs were supplied at an expedited delivery of 3 weeks.
Want to learn more about variable springs? View a past variable spring webinar instantly!
58,000 lb. Load Variable Spring Assemblies for a Power Plant
January 17, 2003
58,000 lb. Load Variable Spring Assemblies for a Power Plant
Piping Technology & Products, Inc. designed and manufactured two custom built variable spring assemblies using heavy duty spring coils and fabricated hardware components.
Variable Spring Assemblies
The loads, as specified by the customer, were greater than the maximum operating loads for our largest (PT&P size 220) standard variable springs. In order to meet the customer’s requirements, a custom variable spring was designed and fabricated using a larger spring coil normally used only in constant spring assemblies.
The specially fabricated variable spring was 20 in diameter with a standing height of 51 and the hanging components (rod, turnbuckle, clevis) were 3 1/2 diameter pieces. The spring rate was 3232 lb./in. All the pipe hanger assembly components were made from carbon steel.
The installed (cold) load was 58,000 lbs. and the operating (hot) load was 61,700 lbs. The calculated movement from cold to hot was 1 1/8 down. The variable spring was tested in the load cell to insure proper operation and also to set the cold load to the specifications provided by the customer.
Do you see a need for variable springs in your piping system? Get pricing today!
70,000 lb. Load Vertical C-Type Constants
December 13, 2002
70,000 lb. Load Vertical C-Type Constants
These 42 13/16″ x 79 5/8″ constants have a double suspension and are made from A36 carbon steel. They will each hold a total of 70,000 lbs. and are designed to move 8½ in. down. Our report generating testing was conducted after the correct load was set.
Do you see a need for constants in your current or future project? Get pricing now!
116,500 lbs. Load Big Ton Springs for a Petrochemical Plant
November 8, 2002
116,500 lbs. Load Big Ton Springs for a Petrochemical Plant
Piping Technology & Products, Inc. designed and manufactured 4 identical Big Ton springs for a petrochemical plant in Texas.
These 66 x 18 x 14.5 Big Ton springs are made of A-36 carbon steel and have a design suitable for temperatures up to 750 degrees F. They have a hot load capacity of 116,500 lbs and a cold load capacity of 94,500 lbs. Load tests were performed to ensure that the springs could safely sustain the specified design load. Applicable travel was ½ downward, but design travel ranges up to 6.
Want to learn more about big ton spring supports? View an engineered spring support webinar today!
Variable Spring Supports for a Refinery in Texas
September 27, 2002
Variable Spring Supports for a Refinery in Texas
Piping Technology & Products, Inc. designed and manufactured variable spring supports for a refinery in Forney, Texas.
The spring supports are made of carbon steel and have a length by casing diameter range from 9-3/16 by 8-5/8 to 53-11/16 by 12 ¾. In order to insure the quality of the springs, compression tests were used with a load capacity of 21,500 pounds.
Need supports like these? Let us help serve your needs!
Big Ton Springs Equipped with Special Rollers
August 23, 2002
Big Ton Springs Equipped with Special RollersRollers Installed On top of the Load Flanges
Piping Technology & Products, Inc. specially designed and fabricated big ton springs equipped with special rollers to accommodate moving apparatus and support piping at a refinery in India.
The specially designed big tons were made to support loads ranging from 55,000 lbs. to 114,000 lbs with no more than 5/16″ upward movement. Its composition comprises of A-36 carbon steel, built to a maximum height of 23-5/8″.
The special rollers installed on the top of the load flange, keeps the aforementioned loads moving smoothly under all kinds of conditions. To further assure their quality, each of the big ton spring assemblies underwent load testing and afterward were hot dipped galvanized to prevent against corrosion.
Want to learn more about big tons? Visit our webinar archives today!
Vertical F-Type Constants for Power Plant
July 19, 2002
Vertical F-Type Constants for Power Plant
Piping Technology & Products custom designed and manufactured vertical F-type constants for a power plant in Connecticut.
The 100 type F is a vertical constant designed to support piping from below with minimum space usage. The dimensions of the constant are 26-5/8″ high, 10″ wide, and 17-9/16″ long with an operating load of 280 lbs.
This particular F constant, was unusual in that it was furnished with a vertical spring that attaches below the frame of the constant. In addition to a downward travel of 3″, the flange table shifts forward at 1-3/8″ to minimize axial movement.
A galvanized finish was applied to the constant to prevent corrosion. The constants can be bolted on or welded to the support or steel underneath.
Need constants for an upcoming project? Ask for pricing today!
Big Ton Springs Equipped with Lifting Lugs
July 12, 2002
Big Ton Springs Equipped with Lifting Lugs
Piping Technology & Products, Inc. specially designed and fabricated big ton springs equipped with side lifting lugs to support piping of a 102-megawatt, refinery cogeneration power plant in California.
Under typical circumstances, this type of job application would utilize variable spring hangers, but because of the restricted space, the hangers’ size would be too small to support a hot load of 19,068 lbs and cold load of 17,212 lbs. In order to satisfy both the required loads and space, PT&P engineers designed and fabricated figure 500 big ton springs equipped with side lifting lugs. The lifting lugs were attached to allow the big ton to suspend as a variable spring would in the field.
Are big ton springs a necessity for your next project! Request a quote today!
Variable Springs to Meet Travels Needed to Support Furnace Tubes of a Hydrogen Reformer
July 5, 2002
Variable Springs to Meet Travels Needed to Support Furnace Tubes of a Hydrogen ReformerCustom Variables in the Field
Piping Technology & Products, Inc. specially designed and fabricated hundreds of altered Type A variable spring hangers in order to accommodate the special travel and spring rate needed to support the furnace tubes of a hydrogen reformer in Venezuela.
In order to accommodate customer specified travel and spring rate, modified spring coils were required. With a travel of 8 7/8, the variable spring hanger casing lengths were increased from the standard size of 32 inches to over 6 feet long. The calculated spring rate is 79 lb/sq in for an operating load of 2,804 lbs. and installed load of 3,505 lbs.
The housings are coated with a heat resistant paint, which protects the spring coils from corrosion and high temperatures of the furnace area.
Want to learn more about variable springs? Visit our webinar archives today!
July 2002 News
July 4, 2002
PT&P Custom Designs and Fabricates Big Ton Springs Equipped with Lifting Lugs
Big Ton Springs
Piping Technology & Products, Inc. specially designed and fabricated big ton springs equipped with side lifting lugs to support piping of a 102-megawatt, refinery co-generation power plant in California.
Under typical circumstances, this type of job application would utilize variable spring hangers, but because of the restricted space, the hangers’ size would be too small to support a hot load of 19,068 lbs and cold load of 17,212 lbs. In order to satisfy both the required loads and space, PT&P engineers designed and fabricated figure 500 big ton springs equipped with side lifting lugs. The lifting lugs were attached to allow the big ton to suspend as a variable spring would in the field.
The big ton springs are comprised of A-36 carbon steel and built at 13″x 23″x 9-1/2″ with a downward travel of .232″. The job was completed within two days to meet the customer’s quick turn requirements.
Introducing PT&P’s Maintenance Free Slide Plates, Bronzphites®
Piping Technology and Products is a supplier of maintenance free slide bearing plates, Bronzphite®, whose high strength bearings and impregnated graphite, together create a concoction ideal for maintaining excellent wear resistance and durability under severe operating conditions. PT&P has supplied Bronzphite® for a number of companies in the oil, gas and power industry.
Constants For Constricted Areas of a Chemical Processing Plant
May 31, 2002
Constants For Constricted Areas of a Chemical Processing Plant
Piping Technology & Products, Inc. custom designed and fabricated 200-C type constants to suit constricted areas of a chemical processing plant in Texas.
Short distances between the pipe and the supporting beam necessitated a custom design. Two designs were needed one was for a 230 lb. load with 11″down travel, while the other was for a 260 lb. load with 13-1/2″ down travel. The PT&P standard design for these constants has Take-Out values of 19-9/16″ and 21-9/16″, respectively. However, the available space permitted no more than 9-1/2″.
Compare the final design, shown on the left to the standard design, shown on the right. Note that the lower part of the frame has been cut away, permitting the pipe to move nearer to the constants’ supporting lugs.
PT&P’s system of stock pipe and spring supports, allowed engineers and workers to fabricate these constants within a short amount of time.
Find out more information about constants in our webinar archives!
C-Type Constants
May 3, 2002
C-Type Constants
Piping Technology & Products, Inc. designed and manufactured 70 horizontal, C-type constants for a furnace application located in Venezuela.
C-Type Constants
The sizes of the Figure 200 constants ranged from 32 to 64, with a total travel of 4.5 to 10.5, and loads varying from 1,149 to 5,149 pounds. The constants are provided with a custom designed PT&P Figure 270, which consists of a double lug horizontal traveler versus a single lug. Within the horizontal travel, the constants are designed to handle 8 of horizontal movement and support a rod that remains vertical throughout pipe movement.
Learn about other types of constants by visiting our webinar archives!
Special Vertical Type E Constant Spring Supports
April 26, 2002
Special Vertical Type E Constant Spring Supports
Piping Technology & Products, Inc. designed and manufactured special vertical type E constant spring supports for a power plant. These were designed and installed as pairs in a configuration similar to the typical G type constants. The advantage of using a pair of the special E rather than the conventional G type is that the total width is smaller as can be seen in Figure 1.
The constants were designed to support loads from 5,730 lbs to 10,690 lbs. They were fabricated from A36 Carbon steel. The dimensions of the individual constants are 60″ high, 16 1/2″ long, and 14″ in wide. The size of the supported pipe determined the width of the assembly. As with all constants built by PT&P, they were tested to verify that standard specifications for variation of load over the full range of travel were met.
Do you need constant spring supports for an upcoming project? Request a quote today!
Constant Spring Hangers with Loads up to 105,000 Lbs.
March 15, 2002
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!
400 Lightweight, Vertical Constant Load Hangers
February 15, 2002
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.
Need some vertical constant load hangers? Let us price one for you today!
January 2002 News
January 2, 2002
How to Size a Spring Hanger
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!
Big Ton Springs With Loads Up To 450,600 Newtons
November 28, 2001
Big Ton Springs With Loads Up To 450,600 Newtons
Piping Technology & Products, Inc. specially designed and fabricated Big Ton Variable Springs for a chemical project in Canada. The supporting beams are 30″ in length with PTFE, 25% glass filled stainless steel slide plates. The Big Ton Springs were designed with six coil springs with external guides to prevent horizontal twisting and internal guides to withstand horizontal friction forces. These units were also designed for operating loads from 260,000 to 350,000 Newtons and hydro-test loads from 300,000 to 450,600 Newtons. A total of six units were painted with a special finish specified by the client.
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