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Variable Springs — The Pipe Supports Blog

Variable Springs with Permanent Adjustment Travel Stops

February 7th, 2003 No comments
Variable Springs with Permanent Adjustment Travel Stops

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.

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58,000 lb. Load Variable Spring Assemblies for a Power Plant

January 17th, 2003 No comments
58,000 lb. Load Variable Spring Assemblies for a Power Plant

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.

58,000 lb. Load Variable Spring Assemblies for a Power Plant

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!

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Variable Springs to Meet Travels Needed to Support Furnace Tubes of a Hydrogen Reformer

July 5th, 2002 No comments
Variable Springs to Meet Travels Needed to Support Furnace Tubes of a Hydrogen Reformer

Variable Springs to Meet Travels Needed to Support Furnace Tubes of a Hydrogen Reformer

Variable Springs to Meet Travels Needed to Support Furnace Tubes of a Hydrogen Reformer

Custom 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.

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Type F Variable Springs With Specially Made Locking Devices

November 3rd, 2001 No comments

 

Type F Variable Springs With Specially Made Locking Devices

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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60,000 Lb. Load Type "B" Variable Spring Hangers

June 27th, 2001 No comments
60,000 Lb. Load Type "B" Variable Spring Hangers

60,000 Lb. Load Type "B" Variable Spring Hangers

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.

Are variable spring hangers a necessity for your next project? Get pricing now!

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PT&P Aids in the Creation of a "Chemical Island" in Singapore

February 8th, 2001 No comments

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 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 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.



RFID Tag for Pipe Supports

February 18th, 2000 No comments
RFID Tag for Pipe Supports

RFID Tag for Pipe Supports

RFID Tag for Pipe Supports

RFID Handheld Reader

Piping Technology & Products, Inc., in conjunction with other sponsors, has completed the first pilot test of Radio Frequency Identification (RFID) technology for the receipt and tracking of pipe supports material at construction jobsites.

The RFID tags and RFID handheld reader used by Piping Technology & Products, Inc. at the Red Hills Power Plant.

RFID Tag for Pipe Supports

PT&P Pipe Supports in the Field

The material shown here arrived from PT&P’s manufacturing facility in Houston, Texas with an RFID tag affixed to each pipe support assembly.

RFID Tag for Pipe Supports

PT&P Providing Training to Field Personnel

Piping Technology & Products, Inc. shipped approximately 150 pipe supports to the Red Hills Power Plant with radio frequency identification (RFID) chips affixed to each pipe supports.  The RFID tags and RFID handheld reader were provided by SAT Safetrac.  Field personnel were trained on the use of the new technology.  The RFID-tagged pipe support assemblies were then received by field personnel.  Videos of the RFID receiving process were taken for the purpose of comparative time and motion studies.

Replacing a Spring Coil With Stainless Steel Bellows

October 21st, 1997 No comments

Spring coils are so pervasive in design of pipe supports that our collective paradigm limits our ability to consider alternatives. The photograph below shows an example of a pipe support designed for the special environment of an off-shore platform which uses a stainless steel metal bellows instead of a spring coil.

Stainless Steel Bellows Used as Spring Coil

Stainless Steel Bellows Used as Spring Coil

This customer was concerned about the corrosive environment and the salt water which will occasionally flow over the pipe support. The rolled plate on the left will be welded to a structural pipe on the platform. A riser clamp (not shown) will be attached on the right. The stainless steel bellows was designed with the proper spring rate and movement.

In need of a spring coil? Let us price one for you today!

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Testing Proves Spring Coils Will Function In a Hot Environment

August 15th, 1996 No comments

An engineer with a major Houston E&C firm had concerns about the effect the temperatures in the furnace his company was designing would have on the coils in the spring supports used to support the tubing. PT&P engineers put the same question to the major suppliers of coils in the U.S.A. No one seemed to have the data to prove the coils would withstand the temperatures. The E&C firm included a requirement to test for relaxation of the coils with their purchase order to PT&P.

A random sample of coils of the size required was selected from PT&P’s inventory. The loads required to compress the coils through ten inches of travel were recorded and the coils were placed in a furnace at a controlled temperature of 176 degrees F for forty-eight hours. After the coils were cooled they were again compressed. No difference in the loads required was observed.

We did not expect any relaxation of the coils, but it was nice to have the experimental data to back our judgment.

Variable Springs in a Variety of Sizes

October 29th, 1993 No comments
Variable Springs in a Variety of Sizes

Variable Springs in a Variety of Sizes

The two pictures above show a variety of spring supports for piping projects. At the top left is a row of spring hanger variables ready to form assemblies with rods, clamps and other hardware. Piping Technology & Products, Inc. manufactures all types of pipe supports and provides complete assemblies packaged and tagged to customer specifications for easy identification by the field crews who install them in power plants, petrochemical plants and paper mills. On the pallet at the top right and scattered through the lower picture are several Type F (base type) variable supports. Special features such as travel stops and the wide range of load and travel requirements result in a large variety of items built to satisfy particular customer requirements.

Are you in need of spring supports? Let us price one for you!

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