These PTP-1 F-Type variable spring assemblies fabricated from A-36 carbon steel, were custom designed to accommodate a height of 11-11/16″ while keeping the same spring rate. The F-Type variable is used to support the pipe from below and are typically mounted to concrete pads via anchor bolts or welded to structural steel. The variables are designed for loads up to 6,500 lb. and a total upward travel of 5/16″.
This Glycol Makeup Tank is fabricated entirely from ASTM A240-304 stainless steel and is rated for 0 psig at 150°F. The tank has a 1,000 gallon capacity and measures 48″ I.D. x 10′-8″ seam-to-seam. The stand pictured behind is also fabricated from stainless steel and measures 11′ high. The customer ordered six additional units and all the Makeup Tanks underwent leak testing prior to shipment.
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The necessary steps for installing all expansion joints shall be pre-planned. The installers shall be made aware of these steps as well as the installation instructions furnished by the manufacturer. The most critical phases of the expansion joint installation are as follows.
Care shall be exercised to prevent any damage to the thin bellows section, such as dents, scores, arc strikes and weld spatter.
No movement of the expansion joint (compression, extension, offset, rotation and especially torsion) due to piping misalignment, for example, shall be imposed which has not been anticipated and designed into the movement capability of the expansion joint. If such movements are imposed, they can result in system malfunction, damage to the bellows or other components in the system. Specifically, cycle life can be substantially reduced, forces imposed on adjacent equipment may exceed their design limits, internal sleeve clearances may be adversely affected, and the pressure capacity and stability of the bellows may be reduced.
Any field pre-positioning shall be performed in accordance with specific instructions which include both the direction and magnitude of the movement.
Anchors, guides and pipe supports shall be installed in strict accordance with the piping system drawings. Any field variances from planned installation may affect proper functioning of the expansion joint and must be brought to the attention of a competent design authority for resolution.
The expansion joint, if provided with internal sleeves, shall be installed with the proper orientation with respect to flow direction.
After the anchors or other fixed points are in place and the piping is properly supported and guided, the expansion joint shipping devices should normally be removed in order to allow the expansion joint to compensate for changes in ambient temperature during the remainder of the construction phase.
Embedplates are metal components which are essentially set-in foundation elementssuch as concrete floors, piers, etc. They provide an attachment point forwelding support components in position or for the addition of sliding plateelements to permit movement along the surface of the embed plates.
If you have too much or too little load,artificially add or detract weight at the spring hanger location by means of a hoist.for example. Once the travel stop is removed you can then adjust to your new orcorrect cold load.
The major point to consider while de-blocking a spring hanger would be to makesure that you are at your true cold condition which means that you can applythe correct installed load that the spring is set to.
Variable Spring Set to Cold Load of 10,413 lb.
Hot settings are the settings at the operatingconditions. Cold settings are the settings at the installed position orstart-up. The piston setting is the location of the position within the snubber at the cold position. Pre-set can refer to the setting specified by theengineer due to the anticipated movement.
Hydraulic Snubber Pre-set to the Midpoint of the Overall Stroke of 6″
You would need to use the insulation type slideplate, ie: marinite, to insulate from the heat with PTFE on top of the structureto absorb the impact load if you have any steam hammers.
Slide Plate Assemblies with 2 3/4″ Marinite Blocks
Axial restraint is usually the clamping forceand in case axial load is considerably higher, axial stops are welded to theinside of the clamp to prevent axial movement of the insulation within thesupport.
Cold Insulated Pipe Anchors with Axial Stops
The purpose of the spring “lock”mechanism is to provide the customer with a pre-loaded support and thehydro-testing of the line must be done with the locks in place to prevent fromdamaging the support.
A load cell is only the measuring device forcalibration and it is used to test all our spring cans and constants.