Cold Process Stainless Steel Seamless Instrument Pipe For Measurement And Control Flow Device

Cold Process Stainless Steel Seamless Instrument Pipe For Measurement And Control Flow Device

Instrumentation tubing refers to the tubing or tubes used to connect instruments to the main piping, to other instruments and apparatus, or to measuring equipment.

A stainless steel instrument tube is a measurement and control device based on the measurement principle and is widely used in industrial and civil fields. Its working principle is to measure and control flow through the pressure difference generated when the fluid passes through the pipeline. Set up a measuring unit in the pipeline, measure the pressure difference of the fluid in the unit, and then use the standard flow calculation formula to get the flow rate.

Since stainless steel instrument tubes should have reliable corrosion resistance and heat resistance, austenitic stainless steels are universally selected as the pressure tubing material.

1. Commonly Used Materials:

AISI & EN/DIN/ISO

ASTM / AISI: 316 /316L, 304/304L, 321/321H, 316Ti, 347 / 347H;

EN/DIN: 1.4301/1.4307, 1.4401/1.4404, 1.4541/1.4878, 1.4571.

Duplex stainless steel

ASTM / AISI: S31803, S32750,S32760, 2205, 904 / 904L.

EN/DIN: 1.4462, 1.4410, 1.4539.

The popular stainless steel grade for instrument tubing is 304 / 304L and 316 / 316L.

2. Surface Finish:

Vacuum bright annealing or protective bright annealing. Surface finish: mechanical polished 320-grit or 400-grit.

3. Dimensional Tolerances:

O.D: ± 0.0.5 mm; W.T: ± 10%; or upon request of the purchaser.

Classification and application scenarios of instrument pipelines

1. Gas Pipeline

Gas pipelines are pipelines used to transmit gas media and are generally used in gas flow meters, pressure transmitters and other instrument equipment. Gas pipelines are characterized by small diameters and fast flow rates, which require accurate measurement of flow and pressure of the gas in the pipelines. Gas pipelines are widely used in industrial fields such as petrochemical, chemical, and oxygen production.

2. Liquid pipeline

Liquid pipes are pipes used to transmit liquid media and are also one of the commonly used types of instrument pipes. Liquid pipelines are characterized by large diameters and slow flow rates. Stable flow and pressure measurements of the liquid in the pipeline are required to ensure stable and reliable system operation. Liquid pipelines are widely used in fields such as hydropower generation and sewage treatment.

3. Steam pipeline

Steam pipes are used to transport steam media, and their main purpose is to transport heat in industrial fields, such as power plants, textile factories, etc. Steam pipelines are characterized by high design pressure and temperature. It is necessary to accurately measure the flow, pressure, temperature, and other parameters of the steam in the pipeline to ensure the normal operation of the system.

4. Vacuum pipeline

Vacuum pipelines are pipelines used to transmit gas media in high vacuum environments. They are mainly used in high-tech fields such as semiconductors and photovoltaics. The characteristic of vacuum pipelines is that the pressure inside the pipeline is very low, which requires strict design and manufacturing requirements, and at the same time, the flow and pressure of the gas in the pipeline must be accurately measured.

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Introduction

Item	Stainless Steel Instrument Tube/Pipe
Standard	ASTM,JIS, AISI, GB, DIN, EN
Material	201,202,301,304,304L,304N,XM21,304LN,309S,310S,316,316Ti,316L, 316N,316LN,317,317L,321,329,etc.
Surface	2b/No.1/No.3/No.4/Ba/8K/Hl
Shape	Round, Square, Rectangular, Oval
Type	Cold Rolled
Test	UT, ET, HT, RT,ect, and others according to the standard,or as the requests of the customers
size	Length	0.5-30 Meter/Customized
	Outer diameter	OD: 3.18mm~810mm WT: 0.2mm~40mm
Delivery time	Within 5-30 days after receiving the prepaid
Package	According to Customer Requirements

Production process

Classification of surface stainless steel

Surface	Feature	Manufacturing Method	Usage
NO.1	Silvery white, dull	Hot rolled to specified thickness	It does not need to have a shiny surface
NO.2D	Silvery white	After cold rolling, heat treatment and pickling are carried out	Common material, deep drawing wood
NO.2B	Luster is stronger than No.2D	After NO.2D treatment, a final light cold rolling is carried out on a polishing roll	Common material
BA	as bright as a sixpence	Non standard, but usually bright annealed surface finish with high surface reflectivity.	Building materials, kitchen utensils
NO.4	Grind	A polished surface obtained by grinding with a 150~180# abrasive belt	Building materials, kitchen utensils
NO.240	Fine grind	Grind with a 240# strop abrasive belt	kitchen utensils
NO.320	Very fine grinding	Grind with a 320# strop abrasive belt	kitchen utensils
NO.400	The gloss is close to BA	Grind with 400# polishing wheel	Common material,Building materials, kitchen utensils
HL	Hairline grinding	It has a large number of whetstone grains when it is used for grain grinding (150~240#)	Buildings, building materials
NO.8	Mirror	The mirror is ground with a polishing wheel	Reflector, decorative