F-Type Variable Springs with Rollers

August 30, 2022

 

F-Type Variable Spring Support & Pipe Roller Assemblies Designed for a Fabrication Company in Texas

Type: Variable Springs w/ Rollers
Size: Springs: 11.1/16″ H | Rollers: 24″ -36″ Dia.
Design: 700-15,970 lb. Loads | 650°F Temp.
Material: HDG Carbon Steel | Cast-iron
Testing: Standard Load Testing & Q.C. Inspection

Variables use coiled springs to support a load and allow movement. The resistance of the coil to a load changes during compression, which is why these devices are called "variables". We offer a variety of different designs of variable spring pipe supports. View Variable Spring Supports Product Section.
For this application, the variable spring with rollers were used in natural gas compressor stations in Texas. Compressor stations are an essential part of a natural gas pipeline that moves natural gas from one location to another. At these stations, natural gas is re-pressurized and sent back into the pipeline system where it travels until the next compressor station. The location and distance between compressor stations is dependent on terrain, and the number of gas wells in the vicinity. Frequent elevation changes and a greater number of gas wells will require more compressor stations.
The compressor station, also called a pumping station, is the "engine" that powers a long-distance natural gas pipeline. As the name implies, the station compresses the gas (increasing its pressure) thereby providing energy to move it through the pipeline. The compressor is driven by a motor fueled by some of the natural gas bled from the pipeline. The size of the station and the number of compressors (pumps) varies, based on the diameter of the pipe and the volume of gas to be moved.
Piping Technology and Products and its subsidiaries provide products and services to this critical piece of the energy infrastructure with not only variable spring supports with rollers showcased here, but also with insulated supports, expansion joints, pipe shoes, guides, and anchors.

PT&P REF. ORIGINAL POST 02172020

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Custom Designed Constant Spring Supports for a Chemical Plant in Singapore

August 23, 2022

Custom Designed Constant Spring Supports for a Chemical Plant in Singapore

Type: Constant Spring Supports
Size: 15-¼” W x 17″ H x 46″ L with 9-¼” OD
Material: Carbon Steel | Hot-dipped Galvanized
Design: 2,379 lb. Load | 10″ Upward Movement

PT&P custom designed and manufactured constant spring supports for a chemical plant in Singapore. The constants are fabricated from A36 carbon steel and include alloy coil springs. The dimensions are 15-¼” W x 17″ H x 46″ L with 9-¼” OD. They were designed for an operating load of 2,379 lb. and movement of 10” upward and were specially designed to incorporate “telescoping spring coil housings ” and painted to protect against corrosion. Standard load and travel tests were performed prior to shipment. As part of the standard quality control process, we test every constant that we build before it is shipped. We are ISO-9001:2015 Certified by DNV GL. Last year we built over 1500 constants alone for our customers. Some were designed to support loads up to 150,000lbs with movements over 48 inches.

These specific constants were for a plant that manufactures industrial gasses such as hydrogen, carbon monoxide, and synthesis gasses. Constant spring assemblies are used in a variety of applications ranging from CDU (crude distillation units), hydrocracking units, RFCC (residual fluid catalytic cracking), naphtha hydrotreater and hydrodesulfurization units (also known as alkylation units), and sulphuric acid regeneration (SAR) units in refineries, LNG, Geothermal, Coker units, HRSG units, and other facilities where there is substantial thermal growth in the piping. They can be configured to accommodate horizontal or vertical movement.

Constants use a spring coil (or set 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 the load to be supported. Instead, these spring supports are designed to accommodate movement due to thermal expansion or contraction. PT&P has set up its manufacturing department to offer an unparalleled set of customization options with minimal impact on delivery timeframes. In addition to our standard (hot-dipped galvanized, neoprene coated spring coils) variable spring supports, we can customize any material, finish, dimension, load, load adjustment, travel, travel stops, and provide sensors for remote monitoring.

PT&P REF. ORIGINAL POST 12112018

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Compact Springs for a Chemical Manufacturing Plant for Agriculture

August 16, 2022

Compact Spring Supports Custom-Designed for a Chemical Manufacturing Plant for Agriculture

Compact spring supports (also known as disc springs) were custom-designed for a chemical plant in the agricultural industry. We design each compact spring for specific applications. Usually, they are used in “tight” spaces where the conventional variable spring is too tall to fit the allowable space between the pipeline and supporting steel structures. In general, compact springs serve the same function as a conventional variable spring, to relieve vibration and stress in the pipeline and associated equipment. The springs supplied here are designed for loads ranging from 5,038 lb. to 15,144 lb. and spring rates from 5,904 lb./in. to 44,455 lb./in. Also, these disc springs were designed for thermal movement ranging from 0.011” to 0.46”. The assemblies are fabricated from 304 stainless steel and include Bronzphite® and stainless steel slide plates to lower the coefficient of friction due to lateral movement. Since there is lateral movement, the conventional variable spring would require “internally guided load columns”, however, these units incorporate a “guiding” feature within the spring’s design. They have an installed height of 10-1/2″ – 26”. Each assembly underwent load testing and other NDE and visual inspection by our QC department before shipment. Applications such as Skid Mounted Process Equipment, Pump and Control Skids, Skid Plants, and other types of Skid Packages where space is extremely limited are ideal applications for Compact Springs.

PT&P REF. ORIGINAL POST 07122021

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Variable Springs for a High-Temperature Furnace Application

June 13, 2022

PT&P Custom Designed Furnace Spring Support Cans For Chemical Plant
PT&P custom-designed and fabricated variable spring supports for a furnace application at a chemical plant in California. The furnace cans are manufactured from carbon steel and painted with red oxide primer because they are exposed to high temperatures where hot-dipped galvanizing is not feasible. The springs are designed for an operating load of 1,261 lb., with movement of 9″ and dimensions of 6″ x 52″ in length. Load tests were performed prior to a 12-14 week shipment.

Within a Reformer, heat-resistant cast alloy tubes are used to produce hydrogen during the process of desulfurization in refining plants, ammonia, methanol, and fertilizer plants. These catalyst tubes (also called reformer tubes) are periodically changed within the units after years of operating under high pressure and temperatures. The new or replacement tubes are manufactured from alloy material that can be lighter or heavier than the previous tubes installed. As a result of this weight change, new furnace springs may also need to be replaced.

Most recently we completed a project for a key client for the largest refinery in Central America with a specialized design using our nano-constant, the world’s smallest constant spring hanger. It supports 765 pounds of load and 7″ of travel in a 0.89 cubic foot envelope (7″ x 10″ x 22″). This particular furnace application required very stringent requirements of load deviation of less than 3% and all supports were made from stainless steel to meet furnace requirements. So, for these particular units, no coating was required since they were manufactured from stainless steel. In order to accomplish this special requirement, our engineering team designed and manufactured a new constant load test machine in-house.

We have manufactured various types of furnace springs and constants for a variety of EPC firms over the past few decades. Our experience and knowledge of the different designs and configurations have helped us to become one of the leading manufacturers of springs and pipe supports for furnace applications.

PT&P REF. ORIGINAL POST 07232018

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Constant Supports Custom-Designed for an Ethane Cracker

May 24, 2022

Constant Spring Supports Custom-Designed with Brush Strip on Horizontal Travelers for an Ethane Cracker

These constant spring supports for an ethane cracker for one of our largest and oldest customers who we worked with almost daily for years. As a matter of fact, a majority of the hangers in this plant are supplied by PT&P dating back to 1971. Today, the new cracker project was designed to take advantage of cheap shale-derived ethane feedstock.

The constant supports were supplied with horizontal travelers with a special “brush strip” help limit the entry of foreign objects. The constants are designed to support an 8” diameter pipeline leading into a furnace. Each spring coil is neoprene coated and the spring can housing is hot-dipped galvanized to protect against corrosion. This type of rigid spring hanger uses a coil or series of coils to accommodate pipe movement throughout the piping system. These particular constant assemblies are designed for horizontal movements ranging from 1” to 6.6” and loads up to 1320 lb. We can customize any material, finish, dimension, load, load adjustment, travel, and travel stops, as well as provide sensors for remote monitoring.

This project was unique in design and testing requirements requested by the client and their customer. Every constant support we build is load-tested by our quality and production teams. In some cases, the customer will ask to witness the testing of a single unit which we do on a regular basis. However, for this project, every constant spring was witness tested with the client’s inspection and engineering teams located at our manufacturing facility utilizing our custom in-house designed test machine.

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Constant Supports Designed with Bronzphite® Slide Plates for Oil Refinery in China

April 4, 2022

These big-ton constant spring supports with Bronzphite® slide plates were designed for a 400 KTA light oil processing and utilization unit in Southeast Asia. The constants are designed for high loads and utilize self-lubricating bearing plates consisting of high-quality bronze and graphite-filled grooves. Bronzphite® can be used where temperatures are up to 1100°F and for high loads, low-velocity applications, and in places where the use of oil or grease is undesirable or unfeasible.

Big Ton Constant Supports Designed with Bronzphite® Slide Plates for Oil Refinery in China

PT&P custom-designed and manufactured a total of four big ton constant spring supports w/ Brozphite® slide plates for a 400 KTA light oil for a processing and utilization unit at one of the largest of largest oil refineries in China. In US refineries, crude oil still makes up a majority of what is produced today: Us energy info admin petroleum supply

These constant assemblies were fabricated from carbon steel and hot-dipped galvanized for extra protection against corrosion. The bronze plate acts as the bearing surface, supporting heavy loads, while the graphite inserts provide a solid, oil-free sliding surface. They are designed for operating temperatures up to 1100°F and an operating load of 187,393 lb., with 1-1/2″ total travel.  It is through the combination of high-strength bearings and impregnated graphite that it is an ideal environment for maintaining excellent wear resistance and durability under severe operating conditions.  Load and travel testing was performed prior to shipment.

Bronzphite slide plate

For this particular crude oil production and mining facility, we also supplied other key products from our portfolio, including variables, snubbers, sway braces, and sway struts. Petroleum refineries change crude oil into products such as jet fuel, gasoline, polypropylene, polyethylene, propane, sulfur, carbon black feed, and diesel that can be used for transportation, heating, feedstocks for making other chemicals, generating electricity, renewable energy, and paving roads.

As an industry leader in the oil, gas, and petrochemical industries for over 47 years, we specialize in designing pipe supports, expansion joints, and insulated supports for unique applications involving both products readily available and products not readily available. Our products are used in the CDU (crude distillation units), hydrocracking units, RFCC (residual fluid catalytic cracking), naphtha hydrotreater, hydrodesulfurization units (also known as alkylation units), and sulphuric acid regeneration (SAR) units in refineries.

 

PT&P REF. ORIGINAL POST 09252017

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152 Variable Spring Supports for a Furnace Application at an Ammonia Plant

March 7, 2022

Ptp variable furnace springs 151617

PT&P custom-designed and manufactured over 150 variable spring supports for a furnace application at an ammonia plant. The ammonia plant was the largest single train plant of its kind in the world for the leader in mineral-based commodity and specialized fertilizer production. As an important base to material for fertilizers, ammonia helps put food on the table as the engine of plant growth. Over 85% of anhydrous ammonia is used as fertilizer for the three primary nutrients of fertilizer: nitrogen, phosphates, and potash. The plant and the EPC for which these were designed and manufactured were in Europe highlighting Piping Technology and Products’ robust international footprint in the marketplace for over 47 years. We serve over 90% of the countries in the world covering almost all continents. Outside of use in the fertilizer industry, ammonia is positioned to have a key role in our renewable-based, lower carbon footprint hydrogen economy supporting on-board hydrogen carrier for fuel cell activities given its high capacity for hydrogen storage based on its molecular structure.

These furnace springs are fabricated from carbon steel and painted with a red-oxide primer to help prevent corrosion. We also designed and manufactured 304 stainless steel pipe clamps to attach the furnace springs to catalysis tubes within the furnace. They are designed to support a cold load of almost 3,000 lb./in. while operating in an area where temperatures are higher than ambient. There were a total of 173 assemblies fabricated for this project, 152 variable hangers, 3 constant spring supports, 6 ball joint rigid struts, and 12 rigid rod hangers. Special load tests were performed before shipping.

PT&P REF. ORIGINAL POST 08072017

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Constant Spring Supports with Stainless Steel & Graphite Slide Plates

February 22, 2022

U-Type Constant Spring Supports in Texas

Type: Constant Spring Supports
Size: 35-7/16″ Height & 75-3/4″ Length
Material: A36 Carbon Steel with HDG | 304 Stainless Steel
Design: 9″ Total Travel at 979°F | Operating Load 6,183 lb.
Testing: Hydro tested at 6,744 lb.

These 200 U-Type constant spring supports with slide plates were designed by PT&P for a plant in Texas. They are fabricated from A36 carbon steel with an HDG finish and are typically designed for vertical movement only. However, when there is lateral or axial movement in the piping system, slide plates can be used in conjunction with these constants. In this instance, graphite slide plates are bolted to the constant’s load flange and used with an upper slide plate manufactured from 304 stainless steel with a mirror finish. The upper slide plate can be welded to the base of a pipe shoe, trunnion, or the saddle of a pressure vessel. Each of the constant spring dimensions are 35-7/16″ in height and 75-3/4″ in length. They are designed for a piping system with 9″ of total travel at 979°F and an operating load of 6,183 lb. Each of these units were load tested to meet the hydro test load of 6,744 lb. before shipment.

Products such as these are used in many different kinds of plants all over the world including refineries, renewable diesel plants, chemical plants for operations such as propane/propylene splitter units, and power plants. We have the ability to custom design and manufacture constants for specific loads and various environmental conditions. A point to note, we provided similar constant spring supports supporting loads over 150,000 lb. for crude oil processing at one of the largest refineries in the world just last year (view this project). Petroleum refineries change crude oil into products such as jet fuel, gasoline, polypropylene, polyethylene, propane, sulfur, carbon black feed, and diesel that can be used for transportation, heating, feedstocks for making other chemicals, generating electricity, renewable energy, and paving roads.

 

PT&P REF. ORIGINAL POST 01122018

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Variable Spring Supports for a Major Pipeline Expansion Project

February 1, 2022

Ptp variable spring 182218

PT&P supplied F-type variable spring supports for pipeline 1150km long carrying various kinds of crude and refined products including gasoline, diesel, and jet fuel. The expansion tripled the capacity of the current line allowing for it to carry 85% of what is transported through British Columbia increasing oil tanker capacity at the terminal seven times.

The spring supports are designed for small movements and operating loads ranging from 15,679 lb. to 19,688 lb. The housing is fabricated from A-36 carbon steel, hot-dipped galvanized, and then painted with 3 different coats (primer, intermediate, and topcoat) of paint to protect against the harsh Canadian winters while providing long term protection against corrosion. These variables will include PTFE, 25% glass filled, slide plates welded to the top of the load flange to allow for translational movement. Each spring is load tested and then preset to the specified installed load and inspected for quality assurance before shipment.

Why PT&P?
For this particular project, the PT&P team worked with the client through the client’s six-month bidding process on the project. Our unique combination of experience, engineering expertise, and production knowledge enabled customers to secure the project. PTP addressed coating considerations, technical queries, and met the demanding delivery needs of the project. PT&P’s turnaround time from PO receipt to the material on-site was 10 weeks.

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Furnace Applications – Spring Supports, Expansion Joints & Furnace Seal Bags

November 9, 2021

Ptp furnace application products

An industrial furnace, also known as a direct heater or a direct-fired heater, is a device used to provide heat for an industrial process. Furnace designs vary as to their function, heating duty, type of fuel, and method of introducing combustion air. Heat is generated by an industrial furnace by mixing fuel with air or oxygen, or from electrical energy. The residual heat will exit the furnace as flue gas. Types of industrial furnaces include batch ovens, vacuum furnaces, and solar furnaces. Industrial furnaces are used in applications such as chemical reactions, cremation, oil refining, glasswork, metallurgy, mechanical engineering, chemicals, ceramic, and building materials. Industrial furnaces using fossil fuels are characterized by heat losses from flue gases with a temperature of 500°C and above.

PT&P supplies many products that are well-suited for furnace applications. The first category we’ll take a look at is Engineered Spring Supports. We size furnace springs the same way as we would for a conventional variable or constant spring support. Construction may include a welded design instead of bolted and custom nameplates with the test data and ID tag. Most furnace spring supports are coated with red oxide primer to avoid potential hazards when exposed to high temperatures.

Ptp furnace application variables in service combined

PT&P specially designed and fabricated hundreds of altered Type A Variable Spring Hangers in order to accommodate the special travel and spring rate needed to support the furnace tubes of a hydrogen reformer in Venezuela. In order to accommodate customer-specified travel and spring rate, modified spring coils were required. With a travel of 8-7/8″, the variable spring hanger casing lengths were increased from the standard size of 32″ to over 6′ long. The calculated spring rate is 79 lb/sq in for an operating load of 2,804 lb. and an installed load of 3,505 lb. The housings are coated with heat-resistant paint, which protects the spring coils from corrosion and high temperatures in the furnace area.

Expansion Joints are not installed inside furnaces due to the extremely high temperatures of the environment and the piping system. Expansion joints will typically be found on the duct work and in the piping coming in and out of the furnace. In the last six months, we have shipped over 40% of our expansion joint jobs in less than 2 weeks to meet customer project deliverables.
Fabric expansion joint application

Fabric Expansion Joints that are in-service near furnaces, typically include a 3-layer belt consisting of Silicone, Fiberglass, PTFE, and Mineral Wool Insulation. The configurations are either round, rectangular or square as seen in the examples below.

Ptp furnace application products

Furnace Bags are used to seal high-temperature tubes that penetrate the furnace floor. The furnace bag consists of multiple layers of flexible, flame and heat resistant, impervious fabric designed to operate from start-up to high-temperature design conditions. The bag will expand and contract with the varying furnace temperatures.

Furnace Bag

Stainless steel clamps or band straps connect one end of the pipe that goes through the penetration opening and the other to another sleeve in the furnace floor. A tapered steel coil is installed around the conduit inside the bag to prevent the fabric from collapsing inward during vacuum conditions. PT&P’s standard furnace seal bag is nickel reinforced, with a special coating that reduces airborne fibers and increases tensile strength.

 

Furnace application diagram

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