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This standard is applicable to pressure-relieving and vapor depressuring systems. Although intended for use primarily in oil refineries, it is also applicable to petrochemical facilities, gas plants, liquefied natural gas (LNG) facilities, and oil and gas production facilities. The information provided is designed to aid in the selection of the system that is most appropriate for the risks and circumstances involved in various installations.

This standard specifies requirements and gives guidelines for the following:

• examining the principal causes of overpressure;
• determining individual relieving rates;
• selecting and designing disposal systems, including such component parts as piping, vessels, flares, and vent stacks.

This standard does not apply to direct-fired steam boilers.

Product Details

Edition:

7th

Published:

06/01/2020

Number of Pages:

247

File Size:

1 file , 4.5 MB

Redline File Size:

2 files , 15 MB

Product Code(s):

C52107, C52107, C52107, C52107

Note:

This product is unavailable in Cuba, Iran, North Korea, Syria

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Please note that any addenda or errata may not be included in translated editions of this standard.

This standard is applicable to pressure-relieving and vapor depressuring systems. Although intended for use primarily in oil refineries, it is also applicable to petrochemical facilities, gas plants, liquefied natural gas (LNG) facilities, and oil and gas production facilities. The information provided is designed to aid in the selection of the system that is most appropriate for the risks and circumstances involved in various installations.

This standard specifies requirements and gives guidelines for the following:

• examining the principal causes of overpressure;
• determining individual relieving rates;
• selecting and designing disposal systems, including such component parts as piping, vessels, flares, and vent stacks.

This standard does not apply to direct-fired steam boilers.

The portions of this standard dealing with flares and flare systems are an adjunct to API Standard 537, which addresses mechanical design, operation, and maintenance of flare equipment. It is important for all parties involved in the design and use of a flare system to have an effective means of communicating and preserving design information about the flare system. To this end, API has developed a set of flare datasheets, which can be found in API 537, Appendix E. The use of these datasheets is both recommended and encouraged as a concise, uniform means of recording and communicating design information.

Product Details

Edition:

6th

Published:

01/01/2014

Number of Pages:

248

File Size:

1 file , 3.5 MB

Redline File Size:

2 files , 19 MB

Product Code(s):

C52106, C52106R, C52106, C52106R, C52106R, C52106

Note:

This product is unavailable in Cuba, Iran, North Korea, Syria

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API 521 is applicable to pressure-relieving and vapor-depressuring systems. Although intended for use primarily in oil refineries, it is also applicable to petrochemical facilities, gas plants, liquefied natural gas (LNG) facilities and oil and gas production facilities. The information provided is designed to aid in the selection of the system that is most appropriate for the risks and circumstances involved in various installations. This standard is intended to supplement the practices set forth in API RP 520-I or ISO 4126 for establishing a basis of design.

API 521 specifies requirements and gives guidelines for examining the principal causes of overpressure; determining individual relieving rates; and selecting and designing disposal systems, including such component parts as piping, vessels, flares, and vent stacks. This Standard does not apply to direct-fired steam boilers.

This edition of API 521 is the identical national adoption of ISO 23251, Petroleum and natural gas industries-Pressure-relieving and depressuring systems

Product Details

Edition:

5th

Published:

01/01/2007

ANSI:

ANSI Approved

Number of Pages:

192

File Size:

1 file , 1.5 MB

Product Code(s):

C52105, C52105, C52105

Note:

This product is unavailable in Cuba, Iran, North Korea, Syria