Nano Constant Performance Test

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.

PT&P Engineering and Design

March 28, 2017

Constant Spring Supports Product Video

May 9, 2016

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.

G-Type Constant Spring Support, 96" Long by 40" High, Designed to Support a 12,818 lb. Load

February 10, 2013

G-Type Constant Spring Support, 96" Long by 40" High, Designed to Support a 12,818 lb. Load
This PTP-100 Type-G constant spring support is 96″ long by 40″ high and will support a 12,818 lb. load. It has an actual travel of 0.3″ and total travel of 1-1/2″. The G-type constant is comprised of two standard constant spring housing sub-assemblies joined together with an intermediate bridge assembly. The bridge assembly is customized to handle up to 26,000 lb. of hydro load. The G-type assembly allows for use in applications with limited space. Special identification tags were installed in addition to PT&P’s standard name plates per the customer’s request. Standard testing was performed and witnessed by an outside inspector prior to shipment.

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

200 E-Type Constant Spring and 3-bolt Pipe Clamp Assembly for a Power Plant in South Carolina

November 15, 2010

200 E-Type Constant Spring and 3-bolt Pipe Clamp Assembly

This 200 E-Type horizontal constant spring support is fabricated from carbon steel with a
hot-dipped galvanize finish. It is designed for a 54,020 lb. load with a total travel of 15.5″. The 3-bolt pipe clamp is designed for a 26″ diameter pipe and is coated with a red oxide primer. Each pipe hanger assembly went through standard load and travel testing prior to shipping. PT&P will design and fabricate any size constant spring support in addition to the sizes listed in our catalog.

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How To Install A Fig. 200 F-Type Constant Spring Support

July 9, 2018
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