API STD 670 (R2022)


Machinery Protection Systems

Includes all amendments and changes through Reaffirmation Notice , March 2022

Published by American Petroleum Institute, 11/01/2014


All of our standards are available in PDF (Portable Document Format), an electronic, downloadable format.

Multi-User Access

After purchasing, you have the ability to assign each license to a specific user.


At any time, you are permitted to make printed copies for your and your members' reference use.

API STD 670, November 2014 – Machinery Protection Systems


API 670 covers the minimum requirements for a machinery protection system (MPS) measuring radial shaft vibration, casing vibration, shaft axial position, shaft rotational speed, piston rod drop, phase reference, overspeed, surge detection, and critical machinery temperatures (such as bearing metal and motor windings). It covers requirements for hardware (transducer and monitor systems), installation, documentation, and testing.

NOTE A bullet (•) at the beginning of a subsection or paragraph indicates that either a decision is required or further information is to be provided by the purchaser. This information should be indicated on the datasheets (see Annex A); otherwise, it should be stated in the quotation request or in the order.

Alternative Designs

The MPS vendor may offer alternative designs. Equivalent metric dimensions and fasteners may be substituted as mutually agreed upon by the purchaser and the vendor.

Conflicting Requirements

In case of conflict between this standard and the inquiry or order, the information included in the order shall govern.

General Product Information:

Revision 5th Edition
Document Type PDF
Pages 255
Document Language English
Publisher American Petroleum Institute (API)
Status Current


Document History