If you are buying a small gas compressor for a well pad or gas lift, you likely need API 11P . For a multi-stage refinery hydrogen compressor, you need API 618 .
Furthermore, mechanical vibration limits on cylinders and piping are defined in terms of unfiltered velocity (typically < 1.5 inches per second RMS for steady-state vibration).
API 11P mandates strict guidelines for cylinder materials (such as ductile iron or forged steel) based on the maximum allowable working pressure (MAWP). The standard requires cylinders to handle the maximum discharge pressures and temperatures without risking catastrophic leaks or structural deformation. Pulsation and Vibration Control api 11p pdf
A: API 11P and ISO 13631 are closely aligned, and many manufacturers design equipment to comply with both standards. However, they are separate documents published by different standards organizations.
It specifies the mechanical design of the compressor, including the frame, crankshaft, connecting rods, crossheads, and cylinders. For applications involving hazardous gases, API 11P defines distance piece types (Type 3 corresponds to API 618 Type C) that provide maximum protection against flammable or toxic gases entering the crankcase. If you are buying a small gas compressor
Historically, API 11P was the go-to standard for high-speed, packaged reciprocating compressors, typically driven by internal combustion engines or electric motors in oilfield production environments. These are often referred to as "separable" compressors, operating at higher rotational speeds (typically above 600 RPM) compared to heavy-duty process compressors. The Shift to ISO 13631 and API 618
The API 11P PDF can be accessed through various channels: API 11P mandates strict guidelines for cylinder materials
: Optimized for high-speed, packaged, upstream production units.
Do not rely on outdated summaries or unauthorized copies. Purchase the official PDF from API.org or its authorized resellers. The cost is minimal compared to a single field failure caused by non-compliance.
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API 11P: Specifications for Packaged Reciprocating Compressors for Oil and Gas Production