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Seamless Pipe
Lomond Engineering has a commitment to holding significant stocks of approved brand Seamless Pipes used in a variety of industries, where strength and quality are critical. Seamless Pipe is generally produced by piercing a solid billet of steel, and may be hot formed or cold drawn depending on the product size and specification guidelines. Some specifications, such as API 5L may cover both Seamless and Welded (ERW, EFW, LSAW etc) executions, whereas pipes specifically for high temperature steam and other processes may be seamless only (ie. ASTM A335).
Carbon Steel
Seamless carbon steel pipes have a variety of uses in process pipework (down-stream) and transmission (mid-stream) applications. The most used grades are ASTM/ASME A/SA106-B, A53-B and API 5L-B, which are available in seamless construction and stocked by Lomond Engineering in approved brands (non-Chinese/non-Indian). We specialise in heavy wall, hard to find schedules such as XXS, S160, S120, S140 etc.
Low Temperature Carbon Steel (LTCS)
Most piping codes allow the use of plain carbon steels at temperatures to -28°C, however where lower temperatures are involved (typically down to -50°C), impact tested carbon steels may be specified. Whilst the chemistry is generally not that different to plain carbon steels, the manufacturing process requires specific heat treatment to attain a fine grain practice and increase impact toughness. Low temp materials to A333/SA333 have minimum Charpy impact (CVN) testing requirements. We are also noticing a shift to low temperature materials by major Oil and Gas operators, in applications where plain carbon steels were previously used.
High Temperature (CrMo)
Generically named “P-Grade” piping, Chrome Moly ASTM/ASME A335/SA335 specification piping has increased properties over carbon steels at elevated temperatures, primarily through the inclusion of Chrome and Molybdenum (although other elements are added in some grades). The most common power generation and petrochemical process pipework grades are P11, P22 and P91 and more recently P92. In the refining sector, P5 and P9 materials are more commonly specified. Size and grade combinations, if not in stock, can be sourced from our worldwide network of vendors.
Seamless Pipe
Lomond Engineering has a commitment to holding significant stocks of approved brand Seamless Pipes used in a variety of industries, where strength and quality are critical. Seamless Pipe is generally produced by piercing a solid billet of steel, and may be hot formed or cold drawn depending on the product size and specification guidelines. Some specifications, such as API 5L may cover both Seamless and Welded (ERW, EFW, LSAW etc) executions, whereas pipes specifically for high temperature steam and other processes may be seamless only (ie. ASTM A335).
Carbon Steel
Seamless carbon steel pipes have a variety of uses in process pipework (down-stream) and transmission (mid-stream) applications. The most used grades are ASTM/ASME A/SA106-B, A53-B and API 5L-B, which are available in seamless construction and stocked by Lomond Engineering in approved brands (non-Chinese/non-Indian). We specialise in heavy wall, hard to find schedules such as XXS, S160, S120, S140 etc.
Low Temperature Carbon Steel (LTCS)
Most piping codes allow the use of plain carbon steels at temperatures to -28°C, however where lower temperatures are involved (typically down to -50°C), impact tested carbon steels may be specified. Whilst the chemistry is generally not that different to plain carbon steels, the manufacturing process requires specific heat treatment to attain a fine grain practice and increase impact toughness. Low temp materials to A333/SA333 have minimum Charpy impact (CVN) testing requirements. We are also noticing a shift to low temperature materials by major Oil and Gas operators, in applications where plain carbon steels were previously used.
High Temperature (CrMo)
Generically named “P-Grade” piping, Chrome Moly ASTM/ASME A335/SA335 specification piping has increased properties over carbon steels at elevated temperatures, primarily through the inclusion of Chrome and Molybdenum (although other elements are added in some grades). The most common power generation and petrochemical process pipework grades are P11, P22 and P91 and more recently P92. In the refining sector, P5 and P9 materials are more commonly specified. Size and grade combinations, if not in stock, can be sourced from our worldwide network of vendors.
Seamless Pipe
Lomond Engineering has a commitment to holding significant stocks of approved brand Seamless Pipes used in a variety of industries, where strength and quality are critical. Seamless Pipe is generally produced by piercing a solid billet of steel, and may be hot formed or cold drawn depending on the product size and specification guidelines. Some specifications, such as API 5L may cover both Seamless and Welded (ERW, EFW, LSAW etc) executions, whereas pipes specifically for high temperature steam and other processes may be seamless only (ie. ASTM A335).
Carbon Steel
Seamless carbon steel pipes have a variety of uses in process pipework (down-stream) and transmission (mid-stream) applications. The most used grades are ASTM/ASME A/SA106-B, A53-B and API 5L-B, which are available in seamless construction and stocked by Lomond Engineering in approved brands (non-Chinese/non-Indian). We specialise in heavy wall, hard to find schedules such as XXS, S160, S120, S140 etc.
Low Temperature Carbon Steel (LTCS)
Most piping codes allow the use of plain carbon steels at temperatures to -28°C, however where lower temperatures are involved (typically down to -50°C), impact tested carbon steels may be specified. Whilst the chemistry is generally not that different to plain carbon steels, the manufacturing process requires specific heat treatment to attain a fine grain practice and increase impact toughness. Low temp materials to A333/SA333 have minimum Charpy impact (CVN) testing requirements. We are also noticing a shift to low temperature materials by major Oil and Gas operators, in applications where plain carbon steels were previously used.
High Temperature (CrMo)
Generically named “P-Grade” piping, Chrome Moly ASTM/ASME A335/SA335 specification piping has increased properties over carbon steels at elevated temperatures, primarily through the inclusion of Chrome and Molybdenum (although other elements are added in some grades). The most common power generation and petrochemical process pipework grades are P11, P22 and P91 and more recently P92. In the refining sector, P5 and P9 materials are more commonly specified. Size and grade combinations, if not in stock, can be sourced from our worldwide network of vendors.

Seamless Pipe
Lomond Engineering has a commitment to holding significant stocks of approved brand Seamless Pipes used in a variety of industries, where strength and quality are critical. Seamless Pipe is generally produced by piercing a solid billet of steel, and may be hot formed or cold drawn depending on the product size and specification guidelines. Some specifications, such as API 5L may cover both Seamless and Welded (ERW, EFW, LSAW etc) executions, whereas pipes specifically for high temperature steam and other processes may be seamless only (ie. ASTM A335).
Carbon Steel
Seamless carbon steel pipes have a variety of uses in process pipework (down-stream) and transmission (mid-stream) applications. The most used grades are ASTM/ASME A/SA106-B, A53-B and API 5L-B, which are available in seamless construction and stocked by Lomond Engineering in approved brands (non-Chinese/non-Indian). We specialise in heavy wall, hard to find schedules such as XXS, S160, S120, S140 etc.
Low Temperature Carbon Steel (LTCS)
Most piping codes allow the use of plain carbon steels at temperatures to -28°C, however where lower temperatures are involved (typically down to -50°C), impact tested carbon steels may be specified. Whilst the chemistry is generally not that different to plain carbon steels, the manufacturing process requires specific heat treatment to attain a fine grain practice and increase impact toughness. Low temp materials to A333/SA333 have minimum Charpy impact (CVN) testing requirements. We are also noticing a shift to low temperature materials by major Oil and Gas operators, in applications where plain carbon steels were previously used.
High Temperature (CrMo)
Generically named “P-Grade” piping, Chrome Moly ASTM/ASME A335/SA335 specification piping has increased properties over carbon steels at elevated temperatures, primarily through the inclusion of Chrome and Molybdenum (although other elements are added in some grades). The most common power generation and petrochemical process pipework grades are P11, P22 and P91 and more recently P92. In the refining sector, P5 and P9 materials are more commonly specified. Size and grade combinations, if not in stock, can be sourced from our worldwide network of vendors.
Seamless Pipe Standards
- API 5L-B
- ASTM A106-B
- ASTM A53-B
- ASTM A333-6
- ASTM A333-1
- ASTM A333-3
- ASTM A335-P5
- ASTM A335- P11
- ASTM A335-P22
- ASTM A335-P9
- ASTM A335-P91
- ASTM A333-3
- NACE MR0175/MR0103
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