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Constant — The Pipe Supports Blog

U-Type Constant Spring Supports Designed for an LNG Plant in Canada

May 6th, 2016 Comments off

U-Type Constant Spring Supports Designed for an LNG Plant in Canada

PT&P designed U-Type constant spring supports for an LNG plant in Canada. These are horizontal constants designed to support piping from below where the base plate is bolted directly to the top of the steel or the foundation using anchor bolts. These specific constant springs are designed to support an operating load of 67,420 lb. with 6” of total upwards travel. The constants are fabricated from galvanized carbon steel for protection against corrosion. Standard load and travel testing were completed to ensure the quality and performance of these constants.

B-Type Constant Spring Supports Designed for a Hydrocracker Application

October 20th, 2014 Comments off

B-Type Constant Spring Supports Designed for a Hydrocracker Application

PT&P manufactured B type constant spring supports for a hydrocracker application at a refinery in Port Author, TX. These custom designed constants are 83″ x 41″ x 20″, and designed to support a 53,000 lb. riser pipe through two trunnions. The constants are designed for an operating load of 26,700 lb. with 10-1/2″ of total travel. They are fabricated from A36 carbon steel and underwent standard load and travel testing prior to shipment.

A-36 Carbon Steel G-Type Constant on a Rush Basis

November 12th, 2008 No comments
Refurbished A-36 Carbon Steel G-Type Constant on a Rush Basis

Refurbished A-36 Carbon Steel G-Type Constant on a Rush Basis

Refurbished A-36 Carbon Steel G-Type Constant on a Rush Basis

Damaged Constants in the Field

This constant spring support is fabricated from A-36 carbon steel and measures 39″ long x 29″ high x 11″ wide. This replacement support is designed to carry 11,000 lb. of piping load with a travel of 2 1/2″ upward. The limiting design factor was to stay within existing structural boundaries while allowing the constant assembly to move through its designed travel range.

Do you require g-type constants for your upcoming project? Contact us for pricing!

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Upthrust U-Type Constant for an Energy Plant

January 3rd, 2007 No comments
Upthrust U-Type Constant for an Energy Plant

Upthrust U-Type Constant for an Energy Plant

Piping Technology & Products, Inc. Designed and Fabricated a Upthrust U-Type Constant for an Energy Plant in California

- Designed for a constant load of 7,733 lb.
- Travel ability is from 0 to 9 inches of total travel
- The constant’s shipping and installation setup is for downward travel
- The constant spring support has been custom designed to reduce its take-off from 36 7/8″ to 29 1/2″

Do you have a need for u-type constants in your plant? Get pricing today!
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Constant Hanger Supports for a Power Recovery Plant

December 7th, 2005 No comments

 

Constant Hanger Supports for a Power Recovery Plant

Constant Hanger Supports for a Power Recovery Plant

Constant support hangers are used to support pipes subjected to vertical movement. The (Fig. PTP 200) constants are designed to support loads from 4,000 lbs to 57,000 lbs. Each weighs approximately 1,500 lbs to 2500 lbs and has a travel of up to 4″ with an adjustable travel stop. Their sizes range from 15 to 100.

The advantage of an adjustable travel stop is that the constant is able to “lock in” at any position within the range of travel for a given constant. This alleviates the need for a total “shut down” of the piping system for temporary conditions such as hydrotesting, repair, or replacement.

Want to learn more about constants? Instantly view a past constant webinar today!


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Constants for an Oil Refinery in Texas

November 16th, 2005 No comments
Constants for an Oil Refinery in Texas

Constants for an Oil Refinery in Texas

These constant hanger assemblies are used to support piping systems subjected to vertical movement. They are capable of supporting loads ranging from 3,000 lbs to 63,000 lbs with a travel range of 5″. They have dimension between 73″ long, 36″ tall, and 23″ wide to 80″ long, 27″ tall, and 12 3/4 ” wide. Standard testing was performed for quality assurance.

Constants for an Oil Refinery in Texas

Constants for an Oil Refinery in Texas

Do you see a need for constant supports in your refinery? Let us price them for you today!
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44,000 lb. load Horizontal Upthrust Constant

May 21st, 2004 No comments

44,000 lb. load Horizontal Upthrust Constant

44,000 lb. load Horizontal Upthrust Constant

Piping Technology & Products, Inc. recently fabricated horizontal upthrust constants for loads ranging from 24,000 lb. to 44,000 lb.  These Fig. PTP 200 type U constants are designed for a travel range of 4″ to 4 ½”. They are fabricated from A36 carbon steel with dimensions ranging from 60″x52″ to 80″x52″. To meet customer specified installation heights, angles were added to the base of each constant. Load testing was performed to ensure product quality prior to shipping.

Want to learn more about constant springs? View a past constant webinar today!


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January 2002 News

January 2nd, 2002 No comments

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
Constant Springs

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.

Slide Plates

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.

Slide Plate

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!



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68" In Height Vertical Upthrust Constants

September 7th, 2001 No comments
68" In Height Vertical Upthrust Constants

68" In Height Vertical Upthrust Constants

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.

Want to learn more about constants? Visit out webinar archives today!



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Emergency Field Service Request on Constant

May 22nd, 2001 No comments
Emergency Field Service Request on Constant

Emergency Field Service Request on Constant

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.

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