B-Type Constant Spring Supports Designed for a Hydrocracker Application

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 is a spring support?

February 11, 2011

We refer to our spring supports as any assembly which includes a spring(either variable or constant) that can accommodate both a pipe load and a pipemovement.

U-Type Constant Springs Custom Designed for Large Travel for an Oil Refinery

Variable Springs Constant Springs

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

Figure 100 C-Type Constant Springs


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 the hot or cold setting mean on a constant spring support?

The “cold” setting on a constant spring support refers to the location of the pipe at the installed position. The “hot” setting refers to the design location of the pipe at the operating position. In general, prior to installation, all spring supports are set at the “cold” setting.

Cold Setting Indicated by the White Diamond on a Constant Spring Support
Cold Setting Indicated by the White Diamond on a Constant Spring Support

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

What is a base-mounted spring?

A base-mounted spring is a subset of either variable or constant spring supports where the support is located below the supported member.

F-type Variable Spring Support with a Stainless Steel Wire Rope Isolator
F-Type Variable Spring Support

Constants that Support up to 38,800 lbs.

December 17, 2004

 

Constants that Support up to 38,800 lbs.
Constants that Support up to 38,800 lbs.
Constants that Support up to 38,800 lbs.
PTP-100 Type C Constant

Piping Technology & Products, Inc. custom designed and manufactured four PTP-100 Type G constants and three PTP-100 Type C constants for a power station in Missouri.  The PTP-100 Type C constants are designed for operating loads of 8,300 lbs. to 25,200 lbs. and have a travel range of 2.5 to 3.5. These constants are fabricated from A36 carbon steel with dimensions ranging from 66×18 to 88×20.

The PTP-100 Type G constants are designed for operating loads ranging from 2,800 lbs. to 38,800 lb. and a travel range of 2.5 to 3.5. They are fabricated out of A36 carbon steel with dimensions ranging from 75×26.5 to 95×50. Standard load and adjustment testing was performed to ensure quality prior to shipping.

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