![]() In practice pigging is an intermittent operation and well planned and monitored. For gas or two-phase fluid pipelines TRVs are not required.ĭesigning the launcher / receiver relief valve for external fire case is impractical although theoretically possible. This is to ensure its protection from overpressure due to thermal expansion of trapped liquid. Normally a pig launcher / receiver for "liquid pipelines" which is designed as per pipeline code is provided a thermal expansion relief valve (TRV). ![]() In addition, a pig trap designed from ASME Section VIII Div.1 will tend to be more expensive than one designed from ASME B31.3 for the same reasons. Generally, given the same pipeline design parameters, a pig trap designed from ASME B31.3 will tend to be costlier than for one designed from ASME B31.4 or B31.8 because of the difference in material grades and thicknesses. In a rare case when a pipeline is designed as per ASME B31.3, this would apply for the launcher / receiver as well.ĭesigning a pig launcher / receiver as per PV code ASME Section VIII Div.1 does not make economic sense. ![]() Hence a pipeline designed as per ASME B31.4 should have a launcher / receiver designed as per the same code and a pipeline designed as per ASME B31.8 would have launcher / receiver as per the same code. CSA Z662:2015: Oil and gas pipeline systems (standard) (Canadian)ĪPI RP 14E: Recommended Practice for Design and Installation of Offshore Production Platform Piping Systems is a 1991 recommended practice and has not undergone a revision since 1991.Īmong the aforementioned codes / standards the ASME codes are quite popular for pipeline / piping design. PD 8010-1:2015: Steel Pipeline on Land (code) (European)Ĩ. ISO 13703:2000: Petroleum and natural gas industries - Design and installation of piping systems on offshore production platforms (standard)ħ. BS EN 14161:2011: Petroleum and natural gas industries - Pipeline transportation systems (MODIFIED version of ISO 13623:2009) (standard) (European)Ħ. ISO 13623:2009: Petroleum and natural gas industries - Pipeline transportation systems (standard)ĥ. ASME B31.8 which governs the design of gas pipelines (code) (USA)Ĥ. ASME B31.4 which governs the design of liquid pipelines(code) (USA)ģ. ASME B31.3: which governs the design of process piping (code) (USA)Ģ. Some countries have developed their own standards which are also mentioned below:ġ. While these designs still exist and work, the modern design approach is to design them according to the connected pipeline or pipe code.įor fresh engineers new to piping / pipeline standards and codes, the following piping / pipeline codes and standards are followed almost universally. Older designs of pig launchers / receivers were based on the ASME Section VIII Div. ![]() Today's blog entry tries to explain the design codes related to them and some rationale for them. ![]() However, I understood that there exists a confusion regarding the design codes to be applied for pig launchers / receivers. Pig Launchers and Pig Receivers have been discussed many times on "Cheresources". That the blog has crossed a milestone of 1.5 million views is a huge encouragement and I wish to thank the readers of my blog for such an overwhelming response. After a long hiatus I am back on my blog. ![]()
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