Pipe Rack vs Topside Module: Laying Out Piping Where Space Costs Money
Onshore you trade space for access. Offshore every square metre and every tonne is paid for. Here is how that one difference reshapes routing, supports and maintenance access.
Environment
Onshore
B31.3, B31.4 or B31.8: Which Code Governs Your Line?
Plant piping, liquid pipelines and gas pipelines each have their own ASME code. Here is where one ends and the next begins, and why the boundary matters.
Hazardous Area Zoning and What It Means for Piping Layout
Every flange, valve stem and drain point is a potential source of release. Zoning tells you where flammable gas may be present, and good layout keeps those zones small.
Sour Service Basics: Reading NACE MR0175 / ISO 15156
When hydrogen sulfide is present, ordinary steel can crack without warning. Here is when a line becomes "sour" and what that changes in materials, hardness and welding.
Hydrotest or Pneumatic Test: When Each Is Allowed
Every new piping system is pressure tested before it goes into service. Water is the default because it stores little energy; gas testing is allowed only when water is impractical, and with extra precautions.
Thermal Expansion on a Long Rack Run: Loops or Expansion Joints?
A hot hydrocarbon line across a refinery unit grows by hundreds of millimetres. Here is how the growth is calculated and why loops usually beat expansion joints.
Pipe Schedules Explained: NPS, OD, STD, XS and Sch 40/80
Pipe size names are a legacy of the 1920s, and they still confuse new engineers. Here is how NPS, outside diameter and schedules fit together.
B31.3 Fluid Service Categories: Normal, Category D, Category M and High Pressure
The fluid service category decides how much examination and testing a line gets. Picking the wrong one either wastes money or leaves a real hazard under-inspected.
Reading a P&ID: The Piping Engineer’s First Document
The P&ID is the contract between process and piping. Learn the handful of details that matter most when you turn it into a 3D model and isometrics.
Which Lines Need Formal Stress Analysis? Building a Critical Line List
You can't run a computer model of every line. A critical line list sorts the system so the stress team spends its time where failures actually happen.