Tag: Constant

Constant Spring Supports with Stainless Steel & Graphite Slide Plates

November 13, 2022

U-Type Constant Spring Supports In Texas

Type: Constant Spring Supports
Size: 35-7/16″ Height & 75-3/4″ Length
Material: A36 Carbon Steel with HDG | 304 Stainless Steel
Design: 9″ Total Travel at 979°F | Operating Load 6,183 lb.
Testing: Hydro tested at 6,744 lb.

These 200 U-Type constant spring supports with slide plates were designed by PT&P for a plant in Texas. They are fabricated from A36 carbon steel with an HDG finish and are typically designed for vertical movement only. However, when there is lateral or axial movement in the piping system, slide plates can be used in conjunction with these constants. In this instance, graphite slide plates are bolted to the constant’s load flange and used with an upper slide plate manufactured from 304 stainless steel with a mirror finish. The upper slide plate can be welded to the base of a pipe shoe, trunnion, or the saddle of a pressure vessel. Each of the constant spring dimensions are 35-7/16″ in height and 75-3/4″ in length. They are designed for a piping system with 9″ of total travel at 979°F and an operating load of 6,183 lb. Each of these units were load tested to meet the hydro test load of 6,744 lb. before shipment.

Products such as these are used in many different kinds of plants all over the world including refineries, renewable diesel plants, chemical plants for operations such as propane/propylene splitter units, and power plants. We have the ability to custom design and manufacture constants for specific loads and various environmental conditions. A point to note, we provided similar constant spring supports supporting loads over 150,000 lb. for crude oil processing at one of the largest refineries in the world just last year (view this project). Petroleum refineries change crude oil into products such as jet fuel, gasoline, polypropylene, polyethylene, propane, sulfur, carbon black feed, and diesel that can be used for transportation, heating, feedstocks for making other chemicals, generating electricity, renewable energy, and paving roads. Constants use a spring coil (or series of coils) to accommodate pipe movement from the initial (installed) condition to the final (operating) condition of the piping system. For all constant spring supports there is no difference in load and the supported load will remain uniform throughout the deflection cycle. Learn more about constant spring supports

 

PT&P REF. ORIGINAL POST 01122018

What does the red, white, and blue markings mean on a constant spring support?

November 23, 2021

Red, White and Blue Marks:

All constants are shipped with at least 3 color-coded rivets (red, white and blue).
Red: operating (HOT) position
White: installation (COLD) position
Blue: over travel (MAX AVAILABLE) position

Below are sketches of one direction vertical travel:

Installation Maintenance Rivets One Direction

 

 

Below is a sketch of dual direction vertical travel:

 

Rivets Two Directions

C-Type Constant Springs Designed for a Chemical Plant in Italy

January 29, 2018

C-Type Constant Springs Designed For A Chemical Plant In Italy

Type: Constant Spring Supports
Size: 14″ x 19″ x 64″
Material: A36 Carbon Steel
Design: 2 1/2” to 5” Total Travel and 7,681 lb. Load
Testing: Standard Load and Travel Tests

PT&P custom designed and manufactured C-Type constant spring supports for a chemical plant in Italy. The constants were designed for travel from 2 1/2” to 5” and are specified to carry a load of 7,681 lb. They are fabricated from A36 carbon steel and have a physical size of 14″ x 19″ x 64″. The supports were designed for max deviation of 6%. The standard load adjustment is 10%. However, this unit was designed with capability of up to 20%, while the standard load deviation is 4%. This constant was custom designed to allow for single pin connection with negligible constant frame at the pin connection. A multi-position locking device was installed, and standard load and travel tests were performed to ensure quality and precise performance.

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

May 6, 2016

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 20, 2014

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.

Does the travel scale represent the movement of the spring or the actual pipe movement?

January 25, 2013

The travel scale onthe constant support shows the total amount of travel of the pipe.

067 Refurbished A 36 Carbon Steel G Type Constant On A Rush Basis 1
A-36 Carbon Steel G-Type Constant

What is a constant spring support?

November 2, 2011

A constant spring support is a pipe support that uses a spring coil (or series of coils) to accommodate pipe movement from the initial (installed) condition to the final (operating) condition of the piping system. For all constant spring supports there is no difference in load and the supported load will remain uniform throughout the deflection cycle.

U-Type Constant Springs Custom Designed For Large Travel For An Oil Refinery
U-Type Constant Springs

What do I do if a constant support is bottomed out?

February 1, 2011

There aretwo possible situations in which the constant would bottom out. One being theload is larger than anticipated and the other being that the amount of travelexceeds the total travel rating for that particular constant. Under the firstcategory, one would be able to increase the load by 10% if the conditionswarranted. Under the second category, replacement of the constant support wouldbe required.

Bottomed Out G-Type Constant In The Field
Bottomed Out G-Type Constant in the Field

What are spring support jacking bolts?

A spring support jacking bolt is a variable spring accessory that aids inremoving the upper limit travel stops. They are usually used in applicationswhere large installed loads are present. They are located directly above theupper travel stop. By tightening the jacking bolt, the installed load can bemore easily transferred to the spring load column.

 
F-Type Variable With Jacking Bolts
F-Type Variable with Jacking Bolts

What are the sizes of spring supports?

November 2, 2010

For variable springs there are 23 sizes with loads ranging from 50 lb. through 50,000 lb. For constant springs, there are 110 sizes with travel ranging from 1″ to 14″ and loads ranging from 0 lb. to 90,000 lb.

F-Type Variable Springs For A Local Chemical Plant

F-Type Variable Spring Supports

24,500 Lb. Load Ptp- 8 Type C Variable Spring Assemblies
PTP-8 Type C Variable Spring Assemblies

123 100 C Constant Spring Supports With Double Lug Suspension And Chained Travel Stops For An Oil Refinery In Canada 1

Figure 100 C-Type Constant Springs

Constant Springs 5
PTP 100-C Size 84 Constant

How much weight can a spring support?

The maximum load that a standard variable spring can support is 50,000 lbs. The maximum load that a standard constant spring can support is 90,000 lbs. A big ton spring support can be be used for loads greater than these standards.

Constant Spring Designed For A 35, 144 Lb. Load
Constant Spring Designed for a 35, 144 lb. Load

How do I check the load setting of a spring support?

To check the load setting, examine the position of the bottom of the load indicator with respect to the scale on the spring’s tag. Read from the bottom of the load indicator to determine position. Next, look at the size of the spring located on the tag. Then, refer to the appropriate load and travel table (Constant Load & Travel Table or Variable Load and Travel Table) to determine the respective spring rate and the “0” load (minimum working range load). Multiply the spring rate by the position value and add that to the “0” load value.

How can I size a constant spring support?

In order to size a constant spring support, you must know the load and the anticipated travel. From that you can determine the amount of total travel and then refer to the constant spring support load and travel table to locate the correct size spring for your design.

Replacement Constant Spring Supports With Neoprene Coating For A Highly Corrosive Application At A Salt Water Cooler Tower
Constant Spring Supports with Neoprene Coating

What does travel mean when discussing spring supports?

When dealing with variable spring supports, travel refers tothe amount of deflection from our installed position to our operating position.When dealing with constant springs, travel refers to the total amount ofdeflection, which could be accommodated by the support.

Spring Support Travel

What are spring cans?

“Spring can” is the general term used to describe either variable or constant spring supports.

Custom Spring Can With Slide Plates
Custom Spring Can with Slide Plates


What is a spring hanger?

A spring hanger is a subset of either variable or constant spring supports that attach directly to structural steel components and are located above the supported member.

Custom Constant Spring Hangers And Pipe Clamps
Constant Spring Hangers

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

November 12, 2008
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 3, 2007
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!
Request-A-Quote

Constant Hanger Supports for a Power Recovery Plant

December 7, 2005

 

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 16, 2005
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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