PIPE AND PIPE DETAILS

PIPE DETAILS

·         Pipe is the basic raw material for piping, skid and other industrial systems.

·         All you know the shape of pipe is round and hollow having standard lengths of 6.3 meter normally.

·         Pipes are denoted by its nominal bore size and its thickness.

TYPES OF PIPES

SEAMLESS PIPES

·         Its name defined its shape that is no any type of seam/joint along its length.

·         Seamless pipes are normally gives a nomenclature as Schedule pipe.

·         Schedule is defines the thickness of pipe, if the schedule is high then pipe is having higher thickness and if schedule is small the pipe is having lesser thickness.

·         Seamless pipes are used in high pressure rating applications.

Example: seamless pipe 50 NB sch. 40

Material

·         ASTM A 106 (ASME SA 106) & ASTM A53 (ASME SA 53) for carbon steel pipe.

·         ASTM A312 type 304 and 316 for Stainless steel pipe.

ERW pipe

·         This pipes having a seam/joint over its length.

·         This pipes are manufactured by electric resistance welding hence call ERW pipes.

·         Thickness of ERW pipes defines by the classes.

·         ERW pipes are used in low pressure application or atmospheric pressure applications.

Example: ERW pipe 50 NB class A.

Material

·         IS 1239, IS 3589 etc.

·         ASTM A312 type 304 and 316 for Stainless steel pipe.

 

EFW pipe

·         This pipes are same as ERW pipe but only joining process is different in both.

·         This are manufactured by Electric fusion welding.

 

ABBREVIATIONS

·         NPS: Nominal pipe size.

·         DN/NB: Nominal diameter / Nominal bore.

·         ID: Inner diameter.

·         OD: Outer Diameter.

·         SCH: Schedule for thickness of pipe.

·         STD: Standard weight pipe thickness.

·         XS: Extra strong pipe thickness.

·         XXS: Double extra strong pipe thickness.

INSPECTION OF PIPES               

·         While inspection of pipes following points should be check thoroughly.

·         Visual appearance of pipes that is pitting, corrosion, etc.

·         Physical damage of pipes such as dent, bend, break, etc.

·         If pipes for higher pressure application needs to carry Ultrasonic test for flaw/defect detection.

·         Manufacturer also needs to do hydro test for each pipe we can confirm it by checking their test certificates.

·         All chemical values should be match with standard material description.

·         All mechanical test values should meet the minimum strength required for that material.

·         All heat numbers mentioned on test certificates need to identify on actual pipes.

·         Pipe outer diameter and wall thickness are very important measurable parameters.

·         If the pipes came directly from manufacturer then he should give his test certificate along with pipes with his endorsement.

·         In endorsement he should mention the quantity of pipes, its specification, date of supply, signature, supplied to details etc.

·         If the pipe supplier is trader then needs to endorsement of manufacturer in which should mention that manufacturer gives so much amount of pipes to this trader.

·         Traders also needs to give his endorsement on test certificate and mention above important information.