Shijiazhuang Zhongzheng Technology Co., Ltd.
| Material | Stainless Steel, Carbon Steel |
| Supply Ability | 200 sets / days |
| Applications | Chemical, Food Processing, Beverage Processing, Brewing, Metallurgy, Oil Refining, Pharmaceuticals |
| Payment Terms | L/C,T/T |
| Delivery Time | 2 months |
| Design Pressure | 0.1-10 Mpa |
| Size | Customized |
| Certification | ASME,ISO 9001,CE, NSF/ANSI 61, WRAS, ISO 28765, LFGB, BSCI, ISO 45001 |
| Place of Origin | China |
| Brand Name | Center Enamel |
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Product Specification
| Material | Stainless Steel, Carbon Steel | Supply Ability | 200 sets / days |
| Applications | Chemical, Food Processing, Beverage Processing, Brewing, Metallurgy, Oil Refining, Pharmaceuticals | Payment Terms | L/C,T/T |
| Delivery Time | 2 months | Design Pressure | 0.1-10 Mpa |
| Size | Customized | Certification | ASME,ISO 9001,CE, NSF/ANSI 61, WRAS, ISO 28765, LFGB, BSCI, ISO 45001 |
| Place of Origin | China | Brand Name | Center Enamel |
| High Light | stainless steel tanks for oil storage ，atmospheric pressure oil gas tanks ，stainless steel gas production tanks | ||
Answering the core question: What is the role of atmospheric pressure in oil and gas production? Atmospheric pressure represents the final operational environment in surface production facilities where stabilized crude oil, produced water, and natural gas liquids are held prior to custody transfer, pipeline transport, or truck loadout. While subterranean reservoirs and upstream wellheads operate under extreme pressures (often thousands of psi), the surface processing train systematically steps down pressure across multiple separation stages until the hydrocarbon liquid reaches ambient atmospheric pressure in stock tanks. This final stabilization step allows volatile light ends to flash off safely, ensuring the remaining stock tank oil meets vapor pressure transport specifications.
Crude oil extracted from deep geological formations contains a complex mixture of dissolved gases, light hydrocarbons, and heavier liquids. Direct reduction from high reservoir pressure to atmospheric pressure in a single step would cause violent flashing, severe liquid foaming, and massive hydrocarbon vapor loss.
High and Intermediate-Pressure Separators: Production fluids first enter high-pressure separation vessels to strip off bulk gas streams safely. The liquid phase then flows into intermediate-pressure separators to capture secondary flash gas.
Atmospheric Stock Tanks: The final stage drops the liquid down to near-ambient atmospheric pressure. In this phase, residual dissolved methane and ethane escape, yielding a stabilized liquid product known as stock tank oil (STO).
Operating at atmospheric pressure introduces distinct operational and environmental challenges that facility engineers must manage:
Reid Vapor Pressure (RVP) Control: Stabilizing crude oil at atmospheric pressure ensures that its vapor pressure is low enough to prevent vapor locking in transport pumps and minimize evaporative weathering losses.
Flash Gas and VOC Emissions: As crude oil drops to atmospheric pressure, volatile organic compounds (VOCs) and hazardous air pollutants are released into the tank headspace.
Vapor Recovery Units (VRUs): Modern upstream facilities utilize closed-roof atmospheric tanks equipped with Vapor Recovery Units to capture low-pressure overhead vapors, compressing and routing them back into sales gas pipelines rather than venting them into the atmosphere.
| Parameter / Feature | High-Pressure Separator | Intermediate Separator | Atmospheric Stock Tank |
|---|---|---|---|
| Operating Pressure | High (typically 100 to 1,500+ psi) | Moderate (typically 20 to 100 psi) | Ambient atmospheric (~0 psig / vented) |
| Primary Fluid Phase | Bulk gas and high-pressure liquid stream | Secondary gas flash and intermediate liquid | Stabilized stock tank oil (STO) and produced water |
| Vapor Management | Routed directly to high-pressure sales gas lines | Routed to medium-pressure fuel gas or compressor suction | Captured via VRU or managed through controlled vents |
| Design Code Standards | ASME BPVC Section VIII | ASME BPVC Section VIII | API 650 or API 12F welded steel tanks |
Q: Why does oil and gas production processing drop to atmospheric pressure?
A: Dropping fluid pressure down to atmospheric levels in stock tanks allows volatile dissolved gases to flash off completely, stabilizing the crude oil so it can be safely stored, measured, and transported without excessive vapor loss.
Q: What is "flash gas" in atmospheric storage tanks?
A: Flash gas is the volume of light hydrocarbon vapors (such as methane, ethane, and propane) that instantly evolves out of solution when pressurized crude oil experiences a drop in pressure as it enters atmospheric tanks.
Q: How do atmospheric tanks prevent environmental emissions in oilfields?
A: Modern production sites equip atmospheric storage tanks with vapor-tight roof seals and Vapor Recovery Units (VRUs) that vacuum up headspace gases and compress them into pipeline networks instead of letting them vent into the atmosphere.
Q: What governs the design of atmospheric oil storage tanks?
A: Atmospheric oil storage tanks are typically designed and fabricated in accordance with industry standards such as API 650 or API 12F, ensuring structural integrity under ambient pressure and low hydrostatic head loads.
Company Details
Business Type:
Manufacturer
Year Established:
2008
Total Annual:
100,000,000-200,000,000
Employee Number:
400~500
Ecer Certification：
Verified Supplier
Shijiazhuang Zhengzhong Technology Co., Ltd (Center Enamel) is a leading high-tech enterprise specializing in the research, development, manufacturing, and sales of a diverse range of equipment. Our core business revolves around providing top-tier solutions, including Glass-Fused-to-Steel (GFS) tank... Shijiazhuang Zhengzhong Technology Co., Ltd (Center Enamel) is a leading high-tech enterprise specializing in the research, development, manufacturing, and sales of a diverse range of equipment. Our core business revolves around providing top-tier solutions, including Glass-Fused-to-Steel (GFS) tank...
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