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How To Choose The Proper P-grades Of A335 Steel Pipe?

Shannxi Shew-E Steel Pipe Co.,Ltd | Updated: Dec 12, 2017

How to choose the proper P-grades of A335 steel pipe?

inventory of ASTM A335 grade P92.jpg


ASTM A335 /ASME SA335,covers chrome moly seamless pipes intended for high temperature service.It is commonly used in the power generation and petrochemical industries including refineries,power plants,petro-chemical plants,hydrocrackers,cokers,high and super high temperature lines, reheat lines, distillation, oil field services, etc.


Sometimes referred to as “P Grade” pipes, there comes in more than 16 grades with the most widely used P-Grades being P5, P9, P11, P22 and P91.The most commonly used P grades in refineries are P5,P9. The most commonly used in the power generation industry and petro-chemical plants are P11, P22 and P91.Then do you known how to select the proper P-grades?


According to the A335 standard, the selection will depend upon design, service conditions, mechanical properties and high temperature characteristics. Each grade recognized under the specification can have differing requirements making for a large variety of choices as the operating environment and fluids running through the line may cover pressure, corrosion and temperature variances. Furthermore, chemical composition differences between different grades that affect their physical properties.


ASTM A335/ASME SA 335 P5, P9, P11, P22, P91 Seamless Pipes, Tubes Mechanical Properties showed below:

Grade

Tensile strength

(MPa)

Yield strength

(MPa)

Elongation(%)

Impact energy(J)

Hardness

P11

415

205

22

35

163HB

P12

415

220

22

35

163HB

P22

415

205

22

35

163HB

P5

415

205

22

35

187HB

P91

585

415

20

35

250HB

P92

620

440

20

35

250HB

 

In general,When choose a P-grade material,some of question below you should to know:

Physical properties of strength;

Upper temperature limits;

Allowable stress;

Thermal fatigue and number of operating cycles;

Number of and configuration of loops and bends;

Compatibility resistance to creep;

Hardness measurements;

Fabrication time & costs;

Weight considerations including pipe supports;

Pre-heat temperatures and post weld heat treatment temperatures;

The selection of parts to be welded, welding procedures, welding quality assurance and welding filler materials.

Other significant variables include temperature of water or steam, pH, oxygen content of fluid, quality of steam, flow velocity, quality of oxide layer on inner surface of the pipe.

 

 

SHEW-E STEEL PIPE can offer a comprehensive range of ASTM A335 grade P92 high pressure steel pipe with a wall Thickness from Schedules 40 through 160, STD, XS, XXS at most attractive price for your needs,Welcome email to info@shew-esteelpipe.com to learn more!

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