WO2022234551A1 - Draining and cleaning pig for oil, gas, and petrochemical pipelines - Google Patents

Draining and cleaning pig for oil, gas, and petrochemical pipelines Download PDF

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Publication number
WO2022234551A1
WO2022234551A1 PCT/IB2022/055254 IB2022055254W WO2022234551A1 WO 2022234551 A1 WO2022234551 A1 WO 2022234551A1 IB 2022055254 W IB2022055254 W IB 2022055254W WO 2022234551 A1 WO2022234551 A1 WO 2022234551A1
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WO
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Prior art keywords
pig
grams
gas
pipeline
pipelines
Prior art date
Application number
PCT/IB2022/055254
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French (fr)
Inventor
Pezhman ALMASI
Bita ALMASI
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Almasi Pezhman
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Almasi Pezhman filed Critical Almasi Pezhman
Publication of WO2022234551A1 publication Critical patent/WO2022234551A1/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
    • C09K8/532—Sulfur
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/06—Sulfur
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/20—Hydrogen sulfide elimination

Definitions

  • Drain and purge pig for oil, gas, and petrochemical pipelines consisting of the following: EPDM, NBR based rubbers, and sulfur and perfur additives.
  • the structural formula is to consider the required compound depending on the pipe size. For instance, mixing 650 grams of EPDM or NBR compound with 150 grams of sulfur and 60 grams of perfur with roller for a 3-inch pipe. Continuing this operation makes a bubble in the compound and the ingredients are completely combined. By putting it in the mold and then in the rubber oven, and raising the temperature to 200 degrees Celsius, a sponge cleaning pig is produced after one hour that could be used in all pipelines, especially for the mentioned conditions. Its dimensions and sizes are also unique (according to the map), which easily passes 90-degree 1.5D bends and completely removes the material through the pipe.
  • a system for recovering and recycling otherwise vented or flared volatile and non-volatile reactive organic materials from pipeline and plant operations associated with oil and gas recovery, refining and petrochemical manufacture, processing, and transportation includes a means to remove and store volatile hydrocarbons for a portion of a system or pipeline.
  • the present invention relates to a new use of foaming products for the production of a compact foam pig, by means of the forced interaction of gas, water and product, capable of moving huge quantities of water accumulated in the gas production pipelines.
  • the water removal takes place in very quick periods of time and allows an important decrease in the pressure drops with consequent quick increase in the produced gas quantities.
  • a method of cleaning tubing in an operating heater in which the tubing has an inlet and an outlet. While the heater is in operation, a hollow, metallic and/or tubular mesh pig is run through the tubing from the inlet to the outlet. Cleaning should be done before contaminant has hardened.
  • An improved pipe pig preferably hollow, metallic and/or made from tubular mesh, has scraping edges made from longitudinal edges of a wire.
  • the tubular mesh may be a knit, weave or may be knotted.
  • the pig is preferably radially expandable up to twice its fully compressed radius, and may have an expanded to force it radially outward.
  • the pipe pig is preferably made of a resilient wire having a polygonal cross-section.
  • a system for recovering and recycling otherwise vented or flared volatile and non-volatile reactive organic materials from pipeline and plant operations associated with oil and gas recovery, refining and petrochemical manufacture, processing, and transportation includes a means to remove and store volatile hydrocarbons for a portion of a system or pipeline.
  • a pipeline pig support rack apparatus includes a frame having a plurality of supports mounted thereon, each extending upwardly from the frame.
  • Each pipeline pig support includes clamps that are comprised of first and second U-shaped members that are attached with a hinge.
  • a bolted connection opposite the hinge is provided for holding the U-shaped members together in a closed position when securing a pipeline pig.
  • Lifting eyes on the frame are provided for enabling the frame, its pig supports and any contained pipeline pigs to be lifted as a unit.
  • a basket receptacle optionally is provided that receives the frame.
  • the frame and basket receptacle are each independently liftable. The basket receptacle prevents spillage of hazardous materials that might be residing upon the pigs after they have been used to clean a particular pipeline.
  • a method and apparatus for sequential launching a plurality of pipeline pigs in serial manner into a gas transmission pipeline incorporates a tubular magazine for receiving a plurality of pigs and having a free piston movable disposed therein.
  • a source of hydraulic fluid medium is provided and is injected into the magazine behind the free piston for movement of the free piston and the pigs for pig launching.
  • a gas energized liquid pump is operated by gas pressure from the gas transmission pipeline under the control of a timer operated gas supply valve for selective introduction of hydraulic fluid medium into the magazine.
  • a control panel incorporating control circuitry is programmable to achieve timed launching of the pigs into the pipeline and shuts down the pig launching mechanism after each pig has been launched.
  • the control circuitry is also capable of rendering an alarm signal if pig launching is not achieved within a predetermined time period.
  • Chemical pigging apparatus including an inflatable device and method of using same
  • the remote controlled chemical pigging apparatus includes a housing and an inflatable device.
  • the inflatable device contains chemicals to dissolve hardened or fossilized materials or contaminants contained within the interior portion of a pipeline, such as an oil or gas pipeline.
  • a pipeline such as an oil or gas pipeline.
  • the inflatable device is inflated and exploded to disperse the pipeline chemicals contained therein onto the hardened materials or contaminants that have fossilized within the pipeline.
  • the hardened, fossilized materials or contaminants are then dissolved to liquefy the contaminants and, subsequently, to discharge the liquefied contaminants through a drain located in the pipeline.
  • a method of cleaning a pipeline with a remote controlled chemical pigging apparatus having an inflatable device is also provided.
  • the pigs were only used to purge pipelines for the last hundred years, but they were used to inspect and find the pipeline’s geometric position over time.
  • Today, the pigs are the most proper and advanced devices for purging, draining, and inspecting pipelines.
  • Pipelines must be purged before using the intelligent pig. Purging includes about 70% of operations in some lines and plays a very important role in operation types, where inspection is not possible without purging.
  • the purging pigs are not utilized just before the inspection pigs, but periodic purging and draining are also used in the newly launched lines.
  • Wax and powder deposition in the production casing makes a major problem in efficiency and operation reduction for the gas, fluids, and petroleum products transmission.
  • All pigging systems can receive the pigs in the launcher to move to the starting point where the pig path is blocked.
  • the pipe pressure must be drained before opening if needed. However, pipe opening has some risks.
  • Pipelines are currently one of the most economical and safest ways for fluids transportation (liquids and gases).
  • the invention intends to drain and measure the internal pipes that are impossible to pig with old techniques.
  • Acid or petrochemical pipes like acetone-EPI, etc.
  • the material must be both durable and soft enough to easily pass several or more sizes and also cross the bends with no conflict. It can also play an important role by removing waste, tramp sediment, and liquid or solid material that limits the transfer operations of the product.
  • EPDM NBR-based rubbers with sulfur and perfur additives.
  • the invention element is:
  • the structural elements are not inventive but the formulation of the composite structure is innovative.
  • the structural formula is to consider the required compound depending on the pipe size. For instance, mixing 650 grams of EPDM or NBR compound with 150 grams of sulfur and 60 grams of perfur with roller for a 3-inch pipe. Continuing this operation makes a bubble in the compound and the ingredients are completely combined.

Abstract

Drain and purge pig for oil, gas, and petrochemical pipelines consisting of the following: EPDM, NBR based rubbers, and sulfur and perfur additives. The structural formula is to consider the required compound depending on the pipe size. For instance, mixing 650 grams of EPDM or NBR compound with 150 grams of sulfur and 60 grams of perfur with roller for a 3-inch pipe. Continuing this operation makes a bubble in the compound and the ingredients are completely combined. By putting it in the mold and then in the rubber oven, and raising the temperature to 200 degrees Celsius, a sponge cleaning pig is produced after one hour that could be used in all pipelines, especially for the mentioned conditions. Its dimensions and sizes are also unique (according to the map), which easily passes 90-degree 1.5D bends and completely removes the material through the pipe.

Description

Draining and Cleaning Pig for oil, gas, and petrochemical pipelines
Drain and purge pig for oil, gas, and petrochemical pipelines consisting of the following: EPDM, NBR based rubbers, and sulfur and perfur additives. The structural formula is to consider the required compound depending on the pipe size. For instance, mixing 650 grams of EPDM or NBR compound with 150 grams of sulfur and 60 grams of perfur with roller for a 3-inch pipe. Continuing this operation makes a bubble in the compound and the ingredients are completely combined. By putting it in the mold and then in the rubber oven, and raising the temperature to 200 degrees Celsius, a sponge cleaning pig is produced after one hour that could be used in all pipelines, especially for the mentioned conditions. Its dimensions and sizes are also unique (according to the map), which easily passes 90-degree 1.5D bends and completely removes the material through the pipe.
B08B9/00 – B08B9/027
Obviously, with the use of up-to-date knowledge in various sciences, the possibility of explaining and interpreting the fundamental issues will be more smooth than before, and the design and construction of the ball drainage and cleaning machine has been no exception. As it is clearly seen, even in the devices that have already been registered in the Patent Office, the mechanism and tools used are in no way comparable to the existing device and are not one of the biggest reasons for using different sciences in its construction which has a significant advantage over its predecessors.
Method for reducing hydrocarbon emissions
United States Patent, 7749308
A system for recovering and recycling otherwise vented or flared volatile and non-volatile reactive organic materials from pipeline and plant operations associated with oil and gas recovery, refining and petrochemical manufacture, processing, and transportation includes a means to remove and store volatile hydrocarbons for a portion of a system or pipeline.
METHOD FOR THE REMOVAL OF DEPOSITS ACCUMULATED IN THE PIPELINES OF TRANSPORT OF GAS
United States Patent Application 20200368794
The present invention relates to a new use of foaming products for the production of a compact foam pig, by means of the forced interaction of gas, water and product, capable of moving huge quantities of water accumulated in the gas production pipelines. The water removal takes place in very quick periods of time and allows an important decrease in the pressure drops with consequent quick increase in the produced gas quantities.
Pig and method for cleaning tubes
United States Patent 6569255
A method of cleaning tubing in an operating heater, in which the tubing has an inlet and an outlet. While the heater is in operation, a hollow, metallic and/or tubular mesh pig is run through the tubing from the inlet to the outlet. Cleaning should be done before contaminant has hardened. An improved pipe pig, preferably hollow, metallic and/or made from tubular mesh, has scraping edges made from longitudinal edges of a wire. The tubular mesh may be a knit, weave or may be knotted. The pig is preferably radially expandable up to twice its fully compressed radius, and may have an expanded to force it radially outward. The pipe pig is preferably made of a resilient wire having a polygonal cross-section.
Method for Reducing Hydrocarbon Emissions
United States Patent Application 20070151603
A system for recovering and recycling otherwise vented or flared volatile and non-volatile reactive organic materials from pipeline and plant operations associated with oil and gas recovery, refining and petrochemical manufacture, processing, and transportation includes a means to remove and store volatile hydrocarbons for a portion of a system or pipeline.
Pipeline pig storage rack apparatus
United States Patent 7874435
A pipeline pig support rack apparatus includes a frame having a plurality of supports mounted thereon, each extending upwardly from the frame. Each pipeline pig support includes clamps that are comprised of first and second U-shaped members that are attached with a hinge. A bolted connection opposite the hinge is provided for holding the U-shaped members together in a closed position when securing a pipeline pig. Lifting eyes on the frame are provided for enabling the frame, its pig supports and any contained pipeline pigs to be lifted as a unit. A basket receptacle optionally is provided that receives the frame. The frame and basket receptacle are each independently liftable. The basket receptacle prevents spillage of hazardous materials that might be residing upon the pigs after they have been used to clean a particular pipeline.
Method and a horizontal pipeline pig launching mechanism for sequentially launching pipeline pigs
United States Patent 5139576
A method and apparatus for sequential launching a plurality of pipeline pigs in serial manner into a gas transmission pipeline. The pig launching system incorporates a tubular magazine for receiving a plurality of pigs and having a free piston movable disposed therein. A source of hydraulic fluid medium is provided and is injected into the magazine behind the free piston for movement of the free piston and the pigs for pig launching. A gas energized liquid pump is operated by gas pressure from the gas transmission pipeline under the control of a timer operated gas supply valve for selective introduction of hydraulic fluid medium into the magazine. A control panel incorporating control circuitry is programmable to achieve timed launching of the pigs into the pipeline and shuts down the pig launching mechanism after each pig has been launched. The control circuitry is also capable of rendering an alarm signal if pig launching is not achieved within a predetermined time period.
Chemical pigging apparatus including an inflatable device and method of using same
United States Patent, 8858732
The remote controlled chemical pigging apparatus includes a housing and an inflatable device. The inflatable device contains chemicals to dissolve hardened or fossilized materials or contaminants contained within the interior portion of a pipeline, such as an oil or gas pipeline. At a specific location in the pipeline, such as at a pig apparatus receiver portion of the pipeline, the inflatable device is inflated and exploded to disperse the pipeline chemicals contained therein onto the hardened materials or contaminants that have fossilized within the pipeline. The hardened, fossilized materials or contaminants are then dissolved to liquefy the contaminants and, subsequently, to discharge the liquefied contaminants through a drain located in the pipeline. A method of cleaning a pipeline with a remote controlled chemical pigging apparatus having an inflatable device is also provided.
Washing the pipes with fast-flowing water or solvent was the only old method to ensure that the pipes were empty which leads to some problems. The pigging not only solves these problems but also prevents the destructive environmental effects of the old methods. The principle technique of manufacturing is on treatment that is controlled discontinuity of the texture structure of the raw materials. This technique not only has an acceptable flexibility but also excellent resistance to highly corrosive substances. The pigs are moving by the fluid and the used pig’s engineering let them completely drain and purge the pipeline without remaining in it.
Running basic concepts in different sciences like mechanics, electronics, and physics that relate to complex fundamental concepts is very difficult. They need ideas that can help them to understand the concepts more clearly. The interdisciplinary fields like mechatronics, etc., have simplified the expressed issues in recent years. Therefore, the owners have designed and produced the device, which has never had any internal or external samples. So, with the help of comprehensible elements, this device gives a better understanding of using materials for this product.
Solution of problem
Pig means Pipeline Inspection Gauge (PIG).
The pigs were only used to purge pipelines for the last hundred years, but they were used to inspect and find the pipeline’s geometric position over time. Today, the pigs are the most proper and advanced devices for purging, draining, and inspecting pipelines.
Pipelines must be purged before using the intelligent pig. Purging includes about 70% of operations in some lines and plays a very important role in operation types, where inspection is not possible without purging.
However, the purging pigs are not utilized just before the inspection pigs, but periodic purging and draining are also used in the newly launched lines.
Wax and powder deposition in the production casing makes a major problem in efficiency and operation reduction for the gas, fluids, and petroleum products transmission.
Despite refining of other petroleum and gas products, the presence of carbon dioxide, hydrogen sulfide, moisture, and corrosive acids, especially in gas pipelines and also the sand and tramp sediments of casing sometimes thighen the production chamber which reduces efficiency. Therefore, extraordinary energy is required to increase the gas, fluids, and petroleum pressure for transferring a certain volume of product.
Oil and gas industry experts generally agree with pipeline pigging, but always the pigging goals are not completely understood by all. Therefore, an incorrect pigging program or type has the reverse effect on the pipeline’s operations and repairs costs.
The pigging of the fluid transfer industries often is performed in a special problem, when there is no other solution especially in oil, gas, and its products. In most cases, the operation takes too much time which caused the maximum blocking of the pipeline, so that the installation was damaged and billions of capital is challenged.
On the other hand, the damage is not always because of the time delays, but the pipeline sediments do not let to use of ordinary pigs.
Washing the pipes with fast-flowing water or solvent was the only old method to ensure that the pipes were empty which leads to some problems. The pigging not only solves these problems but also prevents the destructive environmental effects of the old methods.
All pigging systems can receive the pigs in the launcher to move to the starting point where the pig path is blocked. The pipe pressure must be drained before opening if needed. However, pipe opening has some risks.
The proper pig and pigging program will improve and optimize the pipeline efficiency; and will promote safety and environmental protection and also increase the industry owner’s profits. Pipelines are currently one of the most economical and safest ways for fluids transportation (liquids and gases).
The invention intends to drain and measure the internal pipes that are impossible to pig with old techniques.
The previous pigs were enabling for the pipeline with the following specifications:
Pipes with three or more sizes and about 70% blocking.
Acid or petrochemical pipes (like acetone-EPI, etc.)
Pipes with lots of 90-degree bends (1.5 D) (like petrochemical lines).
These pipes should consist of materials that are not damaged by the mentioned issues.
The material must be both durable and soft enough to easily pass several or more sizes and also cross the bends with no conflict. It can also play an important role by removing waste, tramp sediment, and liquid or solid material that limits the transfer operations of the product.
Note that any of the previous pigs could not cross the mentioned conditions in the pipeline under any circumstances.
Components of the invention element:
EPDM, NBR-based rubbers with sulfur and perfur additives.
The invention element:
The structural elements are not inventive but the formulation of the composite structure is innovative.
Device manufacturing technique:
The structural formula is to consider the required compound depending on the pipe size. For instance, mixing 650 grams of EPDM or NBR compound with 150 grams of sulfur and 60 grams of perfur with roller for a 3-inch pipe. Continuing this operation makes a bubble in the compound and the ingredients are completely combined.
By putting it in the mold and then in the rubber oven, and raising the temperature to 200 degrees Celsius, a sponge cleaning pig is produced after one hour that could be used in all pipelines, especially for the mentioned conditions.
Its dimensions and sizes are also unique (according to the map), which easily passes 90-degree 1.5D bends and completely removes the material through the pipe.
Advantage effects of invention
As explained above, despite this invention, there will no longer be a pipeline that cannot be drained and cleaned, and it has avoided the huge costs that result from not draining these lines. It has also prevented unforeseen fatal and environmental accidents that could result from the explosion of these pipelines.
: Diagram of manufacturing process and percentage of ingredients
: Diagram of manufacturing process and percentage of ingredients
Examples
Washing the pipes with fast-flowing water or solvent was the only old method to ensure that the pipes were empty which leads to some problems. The pigging not only solves these problems but also prevents the destructive environmental effects of the old methods. The principle technique of manufacturing is on treatment that is controlled discontinuity of the texture structure of the raw materials. This technique not only has an acceptable flexibility but also excellent resistance to highly corrosive substances. The pigs are moving by the fluid and the used pig’s engineering let them completely drain and purge the pipeline without remaining in it.
Use of this device in all pipelines with any type of fluid, especially special fluids and pipelines mentioned above.

Claims (4)

  1. Drain and purge pig for oil, gas, and petrochemical pipelines consisting of the following:
    1. EPDM, NBR based rubbers, and sulfur and perfur additives
  2. According to claim 1: The structural formula is to consider the required compound depending on the pipe size. For instance, mixing 650 grams of EPDM or NBR compound with 150 grams of sulfur and 60 grams of perfur with roller for a 3-inch pipe. Continuing this operation makes a bubble in the compound and the ingredients are completely combined.
  3. According to claim 1: By putting it in the mold and then in the rubber oven, and raising the temperature to 200 degrees Celsius, a sponge cleaning pig is produced after one hour that could be used in all pipelines, especially for the mentioned conditions.
  4. According to claim 1: Its dimensions and sizes are also unique (according to the map), which easily passes 90-degree 1.5D bends and completely removes the material through the pipe.
PCT/IB2022/055254 2021-05-05 2022-06-06 Draining and cleaning pig for oil, gas, and petrochemical pipelines WO2022234551A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IR140050140003001286 2021-05-05
IR14003001286 2021-05-05

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7373991B2 (en) * 2005-07-18 2008-05-20 Schlumberger Technology Corporation Swellable elastomer-based apparatus, oilfield elements comprising same, and methods of using same in oilfield applications
US7749308B2 (en) * 2006-01-03 2010-07-06 Mccully Tim Method for reducing hydrocarbon emissions
US8858732B1 (en) * 2014-03-26 2014-10-14 Ahmad A. M. J. J. Al Qanaei Chemical pigging apparatus including an inflatable device and method of using same
US9804607B1 (en) * 2011-11-16 2017-10-31 Zane Coleman Fluid transfer systems, devices, components, and methods of manufacture
WO2018057685A1 (en) * 2016-09-23 2018-03-29 Baker Hughes, A Ge Company, Llc Wear resistant and high temperature resistant elastomer nanocomposites
CN111320821A (en) * 2020-03-20 2020-06-23 江阴海达橡塑股份有限公司 Low-density Ethylene Propylene Diene Monomer (EPDM) extruded sponge material and preparation method thereof
US20200368794A1 (en) * 2018-01-19 2020-11-26 Chimec S.P.A. Method for the removal of deposits accumulated in the pipelines of transport of gas

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7373991B2 (en) * 2005-07-18 2008-05-20 Schlumberger Technology Corporation Swellable elastomer-based apparatus, oilfield elements comprising same, and methods of using same in oilfield applications
US7749308B2 (en) * 2006-01-03 2010-07-06 Mccully Tim Method for reducing hydrocarbon emissions
US9804607B1 (en) * 2011-11-16 2017-10-31 Zane Coleman Fluid transfer systems, devices, components, and methods of manufacture
US8858732B1 (en) * 2014-03-26 2014-10-14 Ahmad A. M. J. J. Al Qanaei Chemical pigging apparatus including an inflatable device and method of using same
WO2018057685A1 (en) * 2016-09-23 2018-03-29 Baker Hughes, A Ge Company, Llc Wear resistant and high temperature resistant elastomer nanocomposites
US20200368794A1 (en) * 2018-01-19 2020-11-26 Chimec S.P.A. Method for the removal of deposits accumulated in the pipelines of transport of gas
CN111320821A (en) * 2020-03-20 2020-06-23 江阴海达橡塑股份有限公司 Low-density Ethylene Propylene Diene Monomer (EPDM) extruded sponge material and preparation method thereof

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