www.pipingtech.com JUNE, 2001  

www.pipingtech.com  |  www.usbellows.com  |  www.swecofab.com

Product of the month

Sweco Fab, Inc., the ASME code fabrication shop of PT&P, designed and fabricated eleven Catalyst storage bins for a large chemical company in Geismer, Louisiana. The catalyst storage bins were created from 304 stainless steel and designed for 6 psig @ 300° F.
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Pre-Insulated Support Catalog

Includes information on cold pipe shoes/ CryoShoes and hot pipe shoes and the insulation material used such as polyurethane foam, laminated beechwood, Foamglas®, Calcium silicate, Marinite®, Firetemp® Browse Online or Request your copy today.

PT&P's Installation & Maintenance Guide

A guide on installation and maintenance for variable spring hanger, big ton springs, constant spring hangers, vibration control & sway brace, snubbers, slide plates, and expansion joints. 
  Areas of Interest
PT&P Verifies New Designs for LNG Phenolic Base Support with Load Testing
Big Ton Springs Installation Guide
Bellows Expansion Joints: Tension Systems
  Maintain normal tension in the pipe system and main anchors so full lateral restraint guides are unnecessary.
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NEW Posting : I have recently inspected a high pressure (100psi)steam piping system that is delivering 16,000kg/hour of steam to some process equipment. During my inspection I saw a 4inch bellows expansion joint being used on misaligned pipes and unsupported. Can you confirm that this is not only bad practice but is unsafe.  Click here to reply
PT&P Verifies New Designs for LNG Phenolic Base Support with Load Testing
Piping Technology & Products, Inc. performs thorough product testing to verify new designs to a LNG Laminated Phenolic base support for an E&C company located in Houston, Texas. In order to determine the failure loads for a 30" diameter, pre-insulated shoes and a 6" diameter Laminated Phenolic base support respectively, PT&P performed lateral-load and axial load tests. The load tests performed ensure the pre-insulated pipe shoes can safely sustain the specified design load. The insulated shoes tested for the E&C company will be in service in 2001 at Atlantic LNG, where they will be used to support the liquid nitrogen gas (LNG) lines. For more information about this project, please refer to our Online Press Release or contact us at info@pipingtech.com.

Big Ton Springs Installation Guide

  1. Measure the existing installed load setting height to make sure that the big ton spring will fit tightly into the space provided. Shim from below as needed to ensure proper fit.
  2. Place the big ton spring in the designated location, making sure that all required slide plates, shims, or auxiliary steel are in their proper positions.
  3. Travel stop bolts can be released after all testing has been done. The travel stops are painted red and located on each end of the big ton spring. Follow the steps below to release the travel bolt stops. Please refer to the drawings to the left.
    (a) Turn the nut on travel stop bolt No. 1 one-half turn; repeat on bolts 2 through 4.
    (b) Repeat in this sequential order until the load is released. The load has now been transferred to whatever the big ton spring is supporting.
  4. CAUTION: Be sure that the nuts on the travel stop bolts are backed off enough to accommodate the appropriate travel (Example: 1 inch of travel - the nuts should be backed off by 2 inches from the bottom of the travel stop plate.)
  5. At this time the Lifting Eye Bolts may be removed.

Tension Systems

In some cases, a straight line system of axial bellows anchors and guides is not practical or desired; or there is no reasonable way/ place to anchor the bellows thrust loads. In such cases self restrained bellows assemblies may be used, such as the double hinge restrained bellows shown below. Thermal expansion (or contraction) in the long pipe is absorbed by an offset deflection of the double hinge assembly.

Bellows thrust load is carried by hinge bars, gimbals, tie rods or other such devices; hence normal tension is maintained in the pipe system and main anchors and full lateral restraint guides are unnecessary.  For more information, please visit http://www.usbellows.com or contact us at info@pipingtech.com. 

Would you like for PT&P/U.S. Bellows/Sweco Fab to come out to your office to make a technical presentation on a specific topic (e.g. expansion joints, pre-insulated pipe supports, slide plates) or to make a general presentation?  Contact PT&P Outside Sales at +1-713-731-0030 or on e-mail at sales@pipingtech.com to setup a time and date.
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