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:
Below is a sketch of dual direction vertical travel:
Function of a Constant Spring
April 29, 2018
B-Type Constant Spring Supports Designed for a Hydrocracker Application
October 20, 2014
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.
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
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.
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 Spring Supports
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
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.
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.
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
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.
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
Constants that Support up to 38,800 lbs.
December 17, 2004
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.
Do you require constant spring supports in your piping system? Get pricing now!
*Note: Time Zone is CDT * Central Daylight Savings Time / GMT -5h Live Webinars are 1 PE/PDH Credit for TX Professional Engineers
This Webinar will focus on the different types of variable spring supports and big ton variable spring supports. Learn about the special features available, in addition to the design of a variable support. View how the different coil configurations produce a unique response to an applied load and see how a spring assembly is loaded. Discover the basic steps in selecting a hanger design and the step-by-step process used to size a spring for your application. Learn about the different attachments, testing, and installation and maintenance procedures. View examples of failed supports provided by our Field Service Division and learn why they failed and how to prevent it. Gain knowledge of the valuable tips used when deciding to replace or re-calibrate a variable spring support, as well as adjustments, shutdown, and isolation procedures.
June 8th: U.S. Bellows 101 - The Basics of Expansion Joints 10:00 am