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  Experienced Manufacturer of Pipe Supports since 1978
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  Webinar Archives > POTW Showcase

Product of the Week Showcase Webinar (August 2009)

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Text Version of the Product of the Week Showcase Webinar

This presentation covers a variety of our featured products that we have made in the past. For those unfamiliar with us, we would like to share a brief background on our company. Piping Technology & Products, Inc., also known as PT&P, has been in business since 1975. PT&P and its wholly owned subsidiaries, US Bellows, Sweco Fab, Pipe Shields, and Anchor Darling, offer a wide range of engineered products and services for various industries and applications. Our product line is extensive, from spring supports, expansion joints, pre-insulated pipe supports, and miscellaneous fabrication to various engineering and technical services, PT&P has decades of experience providing products and services for all your engineering and construction needs.

We have achieved various certifications here at Piping Technology & Products. We have the ASME U-Stamp and R-Stamp for the SWECO division of our company. We are ASME NS certified in our Fronek Anchor/Darling, Enterprises division. We are also part of the Expansion Joint Manufacturers Association through our U.S. Bellows, Inc. division. Most recently we received the ISO 9001:2000 certification for the manufacture of hot and cold supports. We are a Minority Business Enterprise granted by the City of Houston, and additionally, we are a member of the Houston Minority Business Council.

Todays emphasis will be on specific Products of the Week referenced recently. You can find a more detailed description of the products on our website and can see other items that may be of interest.

variety of piping technology products

The first major sub-category to be covered today is engineered spring supports. Within this category, there are variables, big tons, and constant spring supports. All spring supports are meant to hold the load of the piping system as it travels through its thermal growth cycle from its initial settings to its operating condition. The first type of spring supports are variable spring supports. Variables have a change or variation in the load from the initial cold settings to the hot or operating settings. There are several different types of variable springs supports. The hanger types are labeled Type A, B, C, D, E which signify how they are attached to the supporting structure. Type F is a base mounted spring support, and the trapeze support is labeled Type G.

In regards to some special qualities which can be designed into standard supports to make them non-standard, one example is a variable spring with fully adjustable travel stops. This allows easier installation and to provide a means of adjusting the preset load of the springs prior to installation. Full adjustment is accomplished by a modification to the pressure plate, and a slight modification to the housing itself. In this case, a fully threaded rod is used with upper and lower lug assemblies so that it is held in its predefined cold install position. The major difference is that with the full thread option, it is possible to adjust to any position on the spring and within operating range. Another benefit is the aid in installation, where the travel stop rods can be used to absorb some of the initial cold load and then aid in the installation on-site. Another set of custom springs we manufactured consisted of Type A and Type C. These were customized due to load requirements of the customer. In order to support an operating load of 56,000 lb. and an install load of 45,000 lb., they had to have a specially designed spring with an O.D. of 20". In order to house this unique coil, it also needed a non-standard housing, column, pressure plate, etc. to be developed with it.

A second type of special variable spring incorporates the big ton supports. In standard big tons, there is a single row of springs to support the load. In the customized big tons, combinations of coils are used in parallel, so that the load will be spread across the springs. In this way, a big ton can be modified to handle loads that exceed those of a standard spring. For example, a customer needed to support an operating load of 225,000 lb., but had a maximum height of 28-5/8". PT&P designed and manufactured a 59" x 59" box like big ton with a total of nine springs located inside. A similar idea is the mini big ton. In this case, the height is the limiting factor and smaller coils used in parallel are used to support the weight in the reduced size.

constant spring supportThe third category of engineered spring supports are constant spring supports. These are similar to variable springs in that they support a system through its thermal growth cycle with the key difference being that the load remains constant and doesnt change as the piping system moves up or down. A special design case of a constant spring is when PT&P had to accommodate a 46" travel required by a geothermal plant when the normal constant movement is 20". This was accomplished by using a standard spring assembly in the back and developing a large frame assembly that could hold the extra long can assembly. This accommodated the 46" vertical movement and allowed a standard spring coil to be utilized. Another example of a modified constant assembly was altering the design so that it had a universal locking device. This enabled the constant to be locked at any location within the travel range.

A third special design constant spring was used to eliminate the translation motion of the spring. This was accomplished by using two springs in tandem so that each horizontal translation is compensated by a combination cam-shaft linkage device. This transferred the load motion into a straight vertical line, so that the attachment point and supporting point could remain in a linear configuration throughout the total driver of 15".

The next category of supports is pipe shoes, guides, and anchors. The first example is a standard design that was modified to withstand 1,065F. This was done by altering the material from the standard carbon steel to a combination A387 chrome-molly and A193 grade B7 bar stock. The second example of nonstandard pipe supports are some adjustable pipe stands designed to support ductile iron pipe. The ductile piping system had non-standard pipe O.D.s and each support had to be utilized for different configurations. The first support had a semi-circle section matching a flange configuration utilized by the pipe construction crew. The middle connection had a more standard connection, but each cradle had to be made to fit the specific O.D. of that pipe. The third support is a flat base to be used in conjunction with a pipe shoe. A third example of a special design is a 24" pipe shoe to support a 12,900 lb. vertical load, which enabled a support configuration on top that enabled it to act as a guide also. Another example of a modified item consists of some anchors that were designed to insulate the supporting structure from the temperature of the pipe. A separate base plate was designed with pro-molly block as insulation and then attached to the base of the original anchor. This allowed a combination of anchoring force for the pipe and also some insulating properties so that the operating temperature of the pipe would not be transferred to the structure below.

Our third category of devices consists of shock control devices such as sway braces, sway struts, and snubbers. The first unique item we are going to examine is a 126" long sway brace specially designed for 10" instead of the normal 3". This was accomplished by a combination of coils in the housing with an extra long housing. It also required an integrated piston rod to eliminate buckling and/or misalignment during extension and compression due to the length. A second set of fabricated sway braces were specially manufactured to absorb a piping load of 8000 lb. and provide a 9 travel in either direction. Three spring coils were developed and utilized to support the extra weight and allow it to handle the travel length. An example of a non-moving restraint device that we specially fabricated is the 15' sway strut we designed and manufactured for a 128,000 lb. load. The maximum length for a standard sway strut is 10' in length. We utilized unique components to meet these conditions. The next type of control device we are going to discuss is the hydraulic snubber. A good example is the 140,700 lb. hydraulic snubber we manufactured for a power plant in Turkey. The normal maximum load of our largest hydraulic snubber is 128,000 lb.; therefore, a special cylinder was developed to handle the heavy load. Because of the high load, any adjustment of the piston would require 1-2% of that load to move it. As a result, we used a short extension piece with an adjustable rod to allow for some adjustment for any site conditions. A second type of control device is the mechanical snubber. A normal mechanical snubber has a stroke length of 6", but the customer needed a 12" stroke length. To accomplish this, two snubbers were placed in a special housing, back-to-back, to allow the combination of stroke length to reach the 12". A special test was also performed to ensure that both snubbers would lock simultaneously in case of an impulse load.

The fourth category of support assemblies are the components that can be used in conjunction with any of the previous devices. The first example of a special support assembly component is a unique clamp to be used with a hydraulic snubber. A special double flanged heavy duty clamp was developed to hold the 68,000 lb. load. This clamp required several different specifications like two heavy duty flanges, which had to be spaced a certain distance apart in order to support the load. Another consideration was the space gap between the individual support components had to be wide enough to allow the assembly to be fitted over a 4" wide gap. A second type of special design situation using clamps is the use of nonstandard riser clamps being used in parallel supporting two pipes with the same base plate. Normally, a single riser clamp is used to support one pipe, but due to a shortage of space these unique clamp assemblies were designed. They were also being used in an offshore environment and were coated in marine paint while the bolts were coated in PTFE. Another example of highly modified riser clamps are the structural pipe hangers Piping Technology & Products designed for an ongoing project to rebuild the San Francisco-Oakland Bay Bridge. These hangers are made out of A-36 carbon steel and galvanized to withstand corrosion from the ocean waters and rough winds. The supports will be welded to the Pipe Shields C Model Anchor plates, which are set in a cast concrete to the bottom cavity of the bridge. These supports utilize friction holding devices known as MegaLug, which permit attachment to the pipes without welding.

The fifth major category of support components is comprised of slide plates. We will be discussing several different categories, starting with PTFE, 25% glass filled slide plates utilized with other components. Some common uses are in combination with variable springs, constants, and pipe shoes. A point of interest is that the slide plates can be manufactured and cut to any size required to meet the load and travel requested. Bronzphite slide plates are used when temperatures get over 350F, which PTFE arent able to handle. Bronzphite is a combination of graphite buried in phosphorus bronze plates. Bronzphite can be easily adapted to many different circumstances and is capable of temperatures of 500F. Graphite slide plates are used for even higher temperatures of up to 1,000F and can be made in single sheets versus the sections needed for the previous slide plates. The fourth specialty slide plate is Marinite where a smooth sliding surface is used in combination with insulation, such that the heat transferred is isolated from a high temperature to a desired low temperature. Marinite is even used in combination with other slide plates such as PTFE in order to allow the low coefficient of friction from the PTFE, but insulate it from the higher temperatures.

The sixth major category consists of pre-insulated pipe supports which consists of cold shoes for low temperatures applications and hot shoes for high temperature applications. The first example are 24" heavy duty cryogenic pipe supports designed for 5,000 lb. to 11,900 lb. loads with a high density insulation being used to support the weight, while a lighter density covers the rest. Another special cold shoe we developed to not only support the piping system, but also act like as a guide. It has a slot in the insulation which utilizes the pipe lug to be inserted into the slot to act as a restraint device, limiting the movement. Another type of custom designed support we developed were injection-molded anchors for an LNG plant in Canada. They are designed for -29C ambient and -196C fluid temperatures. Polyurethane foam insulation is injected into the mold with a pipe spool in place to ensure maximum fit. An example of a high temperature application is the 84" hot shoes we fabricated for a styrene plant. It is able to withstand temperatures up to 1,220F and can support loads up to 33,721 lb.

Our seventh and final major category of special designed items consists of expansion joints. We manufacture many different types of expansion joints including single, hinged, slip-type, neoprene fabric, gimbal, universal, and many more. The first example consists of highly customized 18" stainless steel expansion joints that were custom designed with machined flange faces and special designed gasket grooves. Several tests were performed on these expansion joints to ensure product quality. Dye penetrant, 100% x-rayed, and a helium leak test at a leak hinged expansion jointrate of 1 x 10-7 were all performed to customers satisfaction. The next example is a 43" hinged expansion joint with 5" refractory lining. Each expansion joint is fabricated from 2-ply Inconel bellows and " wall pipe consisting of 2" thick attachment rings. Thermal and structural Finite Element Analysis (FEA) was performed on the expansion joints to ensure the product is structurally sound and determining the thermal profile helps to prevent polythionic corrosion on the bellows. Another, more elaborate hinged structure is a 30" spent standpipe catalyst metallic expansion joint lined with resistant refractory lining to prevent erosion. This expansion joint utilizes a pantograph style hinge joint whose design will dictate the motion of the expansion joint. The next example is a 54" elbow pressure balanced turbine crossover expansion joint. This particular expansion joint was fabricated for a high pressure turbine crossover piping for a steam service of 97 PSIG at 634F. The original elbow joint cracked while in use; an analysis was performed and it showed that two expansion joints were needed for the joint to run in its normal operating conditions. Another example are some 128" x 229" rectangular fabric expansion joints with a three layer belt. Different configurations were used in order to fit the site specifications, with some expansion joints square while some were rectangular. The frame includes an insulation blanket of mineral wool and stainless steel wire mesh. The frame and liner are fabricated from " thick 304 stainless steel and each expansion joints frame and liner welds were dye penetrant tested before shipping. Our final expansion joint to review includes thick wall flanged and flued head expansion joints. These expansion joints were fabricated from carbon steel with an I.D. of 78" with a 110" O.D. Because of the design pressure and movements needed, 1/4" thick ASTM A516 grade 70 carbon steel was used.

That concludes our presentation on Product of the Week Showcase and we thank you for attending our webinar. For any questions you may have, you can email us at info@pipingtech.com.


 

 

 

 

 

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Mailing: P.O. Box 34506, Houston, TX 77234-4506 Location: 3701 Holmes Road, Houston, TX 77051
Our Subsidiaries: U.S. Bellows: Metallic & Fabric Expansion Joints, Bellows
Sweco Fab: ASME Vessels, Pig Launchers, Spectacle Blinds
 Pipe Shields: Pre-Insulated Pipe Supports, Slides, Guides & Anchors

Fronek Anchor/Darling
: Snubbers, Sway Struts & Sway Braces
Phone: (713) 731-0030 Toll-Free: (800) 787-5914 FAX: (713) 731-8640 info@pipingtech.com

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