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 위의 자료는 스테인레스강 배관 규격입니다.
KS / JIS 일반 강관 (Steel Pipe)
일반 강관 (Steel Pipe) 도 올렸으니 참조 하시길 바랍니다. 조선소에서 선박 배관에 사용하는 강관은 통상 JIS 규격을사용하여 아래와 같이 그 사양이 표시된다. (1) 재질표시 * SGP (Carbon Steel Pipes for Ordinary Piping, JIS G 3452) - 일반배관용 탄소강관(KS표기는 SPP) * STPG (Carbon Steel Pipes for Pressure Service, JIS G 3454) - 압력배관용 탄소강관(KS표기는 SPPS) * STS (Carbon Steel Pipes for High Pressure Service, JIS G 3455) - 고압배관용 탄소강관 (KS표기는 SPPH) * STPT (Carbon Steel Pipes for High Temperature Service, JIS G 3456) - 고온배관용 탄소강관 (KS표기는 SPHT) * STPY (Arc Welded Carbon Steel Pipes, JIS G 3457) - 배관용 아크용접 탄소강관 (KS표기는 SPW) (2) 강도표시 - 숫자는 N/mm2 단위의 인장강도를 의미한다 * SGP (별도표기 없이 최소 인장강도 290 N/mm2) * STPG 370 / 410 * STS 370 / 410 / 480 * STPT 370 / 410 / 480 * STPY 400 (3) 제조방법 - 길이방향으로 이음매 유무를 구분 * E = ERW (Electric Resistance Welding, 전기저항용접관) * S = Seamless (이음매없는 없는관) (4) 두께표시 * #40 = Schedule 40 (SCH 40 으로 표기하기도 한다) * 규격의 치수표에서 각 스케듈에 해당하는 두께를 정해놓고 있다. (5) 호칭경 (Nominal Diameter) * A (mm 단위) 와 B (inch 단위) 두가지가 있으나, A 가 주로 쓰인다. * 파이프의 내경이나 외경의 정확한 치수를 표시하는 숫자가 아님에 주의하여야 한다. (아래 표 참조) 즉, STPG 370 E #40 100A 라고 표기된 파이프는 ~ 370 N/mm2 의 최소 인장강도를 갖는 재질의, ~ 압력배관용 강관인데, ~ 전기저항용접으로 제작된 (길이방향의 seam 이 있는), ~ 두께가 6 mm 인, ~ 내경 102.3 mm, 외경 114.3 mm 인 파이프를 의미한다. People always confused about how to describe steel pipe dimensions (sizes) in correct ways, or how to clarify to seller what exactly pipe size we are going to purchase. In case any misunderstandings or a different size we purchased, that will be a big trouble. So, what are the exactly right ways to express the steel pipe dimensions? For your better understanding, we will explain from below aspects: 3 characters for a pipe dimension And finally, we will tells you how to describe steel pipe dimensions & sizes correctly. Steel Pipe Dimension 3 charactersA completely description for steel pipe dimension includes outer diameter (OD), wall thickness (WT), pipe length (Normally 20 ft 6 meter, or 40 ft 12 meters). Through these characters we could calculate the pipe weight, how much pressure pipe could bear, and the cost per foot or per meter. Therefore, that’s why we always need to know a right pipe size. Steel Pipe Dimensions Chart (Size Chart)Pipe Schedule Chart unit in mm as below, view here for
Pipe Schedule Chart in inch. Dimension standards for steel pipeThere are different standards to describe the steel pipe size, OD and wall thickness. Mainly are ASME B 36.10, ASME B 36.19. Relevant standard specification ASME B 36.10M and B 36.19MBoth ASME B36.10 and B36.19 are the standard specification for the dimensions of the steel pipe and accessories. ASME B36.10MThe standard covers the standardization of steel pipe dimensions and sizes. These pipes includes seamless or welded
types, and applied in high or low temperature and pressures. On the hand, for steel tube dimensions, the actual outside diameter same with pipe number for all sizes. Why pipe size smaller to NPS 12 (DN 300) have different ODFirst, we need to admit that all pipe size should be identified as nominal pipe size (NPS). Second, for NPS 1/8 (DN 6) to NPS 12 (DN 300), these are based on a standard outside diameter (O.D.) This O.D. was originally selected to specify pipe dimension, but as the pipe always have an wall thickness and internal diameter (ID). For small pipe, there is a different size between OD and ID (Wall thickness), but as the pipe dimensions became larger, the OD and ID approximately to become equal. As there is no such relation between the old standard thickness (O.D.) and Nominal Size, so both of them accepted by standard ASME B 36.10 M. Steel Pipe ScheduleIn ASME B36.10M, Pipe schedule identified as Standard (STD), Ex-Standard (XS), or Double Extra Strong(XSS); Or with Schedule No. 5, 10, 20, 30, 40, 80, 120, 160. ASME B36.19MASTM B36.19M is for the stainless steel pipe dimensions, included seamless and welded types as the same. This dimension standard mostly is same with ASTM B36.10M. Wherever the different part is: Above mentioned pipe thickness is different with B36.10M, so suffix “S” is used here. Ways of express pipe dimensions1. For Pipe wall thickness: Use
Steel Pipe Schedule, like schedule 40 steel pipe, schedule 80 pipe. What is Steel Pipe Dimensions Schedule?Steel pipe schedule is a indicating method represented by ASME B 36.10, and also used in many other standards, marked with “Sch”. Sch is the abbreviation of schedule, generally appearing in the American steel pipe standard, which is a prefix of a series number. For example, Sch 80, 80 is a pipe number from chart/table ASME B 36.10. “Since the steel pipe main application is to transport the fluids under pressure, so their internal diameter is their critical size. This critical size is taken as nominal bore (NB). Therefore, if steel pipe carry the fluids with pressure, it is very important that pipe shall have enough strength and enough wall thickness. So wall thickness is specified in Schedules, which means the pipe schedule, abbreviated as SCH. Here ASME is the given standard and definition for the pipe schedule.” The pipe schedule formula:Sch.=P/[ó]t×1000 What does SCH mean for the steel pipe dimensionsAs describing the steel pipe parameter, we usually use the pipe schedule, It is a method that represent pipe wall thickness with number. Pipe schedule ( sch. ) is not a wall thickness, but a wall thickness series. Different pipe schedule means different wall thickness for the steel pipe in the same diameter. The most frequently indications of schedule are SCH 5, 5S, 10, 10S, 20, 20S, 30, 40, 40S, 60, 80, 80S, 100, 120, 140, 160. The larger the table number, the thicker the surface pipe wall, the higher the pressure resistance. Schedule 40, 80 steel pipe dimension meansIf you are new in pipe industry, why you always see a schedule 40 or 80 steel pipe everywhere? What kind of material for these pipes? As you have read above articles you know that Schedule 40 or 80 represent a pipe wall thickness, but why it always been searched by buyers? Here is the reason: Schedule 40 and 80 steel pipe as the common sizes that required in different industries, because of the generally pressure these pipes bear, they are always been asked for a large quantity. The material standard for such thickness pipes has no limitations, you could ask sch 40 stainless steel pipe, like ASTM A312 Grade 316L; Or sch 40 carbon steel pipe, such as API 5L, ASTM A53, ASTM A106B, A 179, A252, A333 etc.. What is the Nominal Pipe Size (NPS)?Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. Pipe size is specified with two non-dimensional numbers: a nominal pipe size (NPS) based on inches, and a schedule (Sched. or Sch.). What is DN (Nominal Diameter)Nominal diameter also mean outside diameter. Because as the pipe wall is very thin, the outside and inside diameter of the steel pipe is almost same, so the average value of the both parameters is used as the name of the pipe diameter. DN (nominal diameter) is the general diameter of various pipe and pipeline accessories. The same nominal diameter of the pipe and pipe fittings can be interconnected, it has interchangeability. Although the value is close or equal to inside diameter of pipe, It is not the actual sense of the pipe diameter. The nominal size is represented by a digital symbol followed by the letter “DN”, and mark the unit in millimeters after the symbol. For example, DN50, a pipe with a nominal diameter of 50 mm. DN (mm) and NPS (inch) conversionNominal diameter DN (mm) and NPS (inch) conversion 1. Conversion DN ( mm ) that requires separate memory
2. Greater than or equal to DN100 diameter and NPS conversionDN=25*NPS; 3. Exact conversion1 inch =25.4 mm Pipe Weight Class ScheduleWGT class (weight class) is an indication of the pipe wall thickness in early, but still used. It has only three grades, namely STD ( standard ), XS ( extra strong ), and XXS ( double extra strong ). How to describe steel pipe dimensions and size correctly?For example: a. Expressed as “pipe outside diameter × wall thickness”, such as Φ 88.9mm x 5.49mm (3 1/2” x 0.216” ). 114.3mm x 6.02mm (4 1/2” x 0.237”), length 6m (20ft) or 12m (40ft), Single Random Length (SRL 18-25ft), or Double Random Length (DRL 38-40ft). b. Expressed as “NPS x Schedule”, NPS 3 inch x Sch 40, NPS 4 inch x Sch 40. Same size as above specification. c. Expressed as “NPS x WGT Class”, NPS 3 inch x SCH STD, NPS 4 inch x SCH STD. Same size above. d. There is another way, in North America and South America, usually use “Pipe Outer Diameter x lb/ft” to describe pipe size. As OD 3 1/2”, 16.8 lb/ft. lb/ft is pound per feet. |
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