In the fields of oil and gas gathering and transportation, and chemical media transportation, pipeline pigging is a necessary means to ensure unobstructed pipeline flow and reduce operational pressure losses. However, when the operating environment extends to northern winters or low-temperature media conditions, the low-temperature brittleness of conventional carbon steel pigging cylinders becomes a prominent hidden danger. To address this issue, Tianmiao Chemical Machinery Co., Ltd.’s independently developed low-temperature structural steel pigging cylinder has recently completed factory inspection and officially entered service. This equipment has specifications of DN250/150*2000, with the main body made of Q345D low-temperature structural steel, a net weight of 483kg, and can operate stably in environments down to -40℃, providing reliable equipment support for low-temperature pipeline pigging operations.
Core Specifications and Material Selection of Low-Temperature Structural Steel Pigging Cylinder
We design the low-temperature pigging cylinder strictly per GB150 standards.Above all, its core value lies in upgraded materials and cryogenic adaptability.Specifically, the equipment body uses Q345D low-alloy high-strength steel.Even at -40℃, it keeps required minimum impact energy in tests.As a result, it reduces brittle fracture risks during winter operation.
DN250/150*2000 Specification and 483kg Net Weight Analysis
This low-temperature structural steel pigging device0. has a nominal diameter of 250mm for the main pipe and 150mm for the reducing end, a straight section length of 2000mm, and an overall net weight of 483kg.Specifically, this specification is primarily designed for small-to-medium diameter gathering and transmission pipelines.Moreover, the 2000mm cylinder length provides ample space for the pig, preventing loading jams.Meanwhile, the 483kg net weight balances wall thickness allowance under low-temperature conditions.Thus, it ensures ease of on-site hoisting.
The Low-Temperature Toughness Advantage of Q345D Main Material
1. We use Q345D steel that meets GB/T1591 standard. 2. Q345D outperforms Q345B/C at -40℃ impact toughness. 3. Our cryogenic equipment wins recognition from users. 4. It delivers stable toughness without thicker walls. 5. It avoids high cost of austenitic stainless steel.
How does the cryogenic structural steel pigging receiver and launcher canister solve the winter pigging challenges?
Pigging operations need to be performed regularly.However, if the receiver and launcher canister fails to open and close properly due to low-temperature embrittlement, the entire pipeline’s maintenance schedule will be disrupted.To solve this, Tianmiao’s R&D team has systematically optimized the cryogenic structural steel pigging receiver and launcher canisters from both structural and component perspectives.
Quick-opening blind flange and cryogenic sealing system compatibility
1. It fixes seal hardening and poor rebound in low temperatures. 2. Our device uses special cryogenic sealing rings. 3. The seals hold stable contact pressure down to -40℃. 4. The quick-opening blind flange needs no tools to operate. 5. Workers with thick gloves can load pigs easily. 6. It greatly improves winter outdoor operation efficiency.
The reducing structure seamlessly matches pipeline specifications.
The equipment’s inlet and outlet are equipped with DN250/150 reducers.Therefore, it connects directly to downstream pipelines without adjustment.In addition, the smooth 2000mm cylinder wall lowers pig passage resistance.
Application Scenarios and Customer Value of Low-Temperature Structural Steel Pig Launcher/Receiver
1. We deploy our cryogenic pig launcher/receiver across northern China. 2. It serves many oil & gas stations and chemical industrial parks. 3. Winter pigging runs normally even at low temperatures. 4. The equipment keeps excellent sealing performance. 5. Users report no freeze cracks or leaks during operation.
Reducing Total Lifecycle Maintenance Costs
1. Q345D steel ensures stable low-temperature toughness. 2. It delivers toughness without extra wall thickness. 3. We offer strength-matched solutions for existing pipelines. 4. We cut dissimilar steel welding and heat treatment. 5. We help you pass reviews and material inspections quickly.
Meeting the Upgraded Low-Temperature Material Selection Standards for New Projects
1. Engineering adopts GB/T 1591 and other material standards. 2. More low‑temp pipeline projects need Q345D or higher material. 3. Tianmiao’s cryogenic pigging launcher meets this upgrade demand. 4. We help you cut procurement costs and comply with regulations. If you want, I can polish it further for official brochure English.
Tinmiao Chemical Machinery focuses on R&D of special pressure vessels.In particular, our cryogenic steel pigging receiver keeps your original process unchanged.We adapt materials and seals for low-temperature working conditions.For example, winter pigging risks: embrittlement, seal failure, substandard materials.Contact Tianmiao for professional customized solutions.