API 5L comparison standards

The API 5L specification covers pipes to conveying oil, gas, water in the petroleum, gas and water distribution industries. The API 5L specification latest edition can be read on the API website directly.

API 5L pipes may be classified according to the following criteria:

  • execution: seamless or welded (seamless pipes may be used up to 24 inches, LSAW above 24 inches, ERW up to 20 inches)
  • specification level (API PSL1, PSL2): PSL1 is a standard quality used for pipelines, whereas PSL2 sets more stringent chemical, mechanical properties, and testing requirements
  • surface finish: black, varnish painted, anti-rust oil, galvanized, coated externally (3PL) and/or lined internally
  • ends types: plain, beveled, threaded ends

The main advantages of API 5L pipe are:

  • Resistance to cracking forces that may propagate in long pipelines
  • Sour service suitability
  • Rather inexpensive and long service life (at least grades B, X42)

USA

UK

Germany

Sweden

API 5L

BS3601

DIN 1629

Grade A SMLS

HFS 22 & CDS 22

St 35

SIS 1233-05

Grade B SMLS

HFS 27 & CDS 27

St 45

SIS 1434-06 *

API 5L

BS3601

DIN 1625

Grade A ERW

ERW 22

Blatt 3 St 34-2 ERW

Grade B ERW

ERW 27 1)

Blatt 4 St 37-2 ERW

API 5L

BS3601 Double welded

DIN 1626

Grade A EFW

ERW 22

Blatt 3 St 34-2 FW

Grade B EFW

ERW 27 1)

Blatt 4 St 37-2 FW

API 5L

BS3601

DIN 1626

FBW

BW 22

Blatt 3 St 34-2 FBW

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