ASME SA 516 Grade 70 MATERIAL

ASME SA 516 Grade 70, is the most popular steel grade material used in boiler and pressure vessels, petrochemical  and oil & gas industries.
It having good weldability and machinability property.

Mechanical Properties of SA 516 Grade 70

Having good allowable strength 20000Psi  Up to 500 F.
It available in different plate thickness size.  from 3/8" to 16".

Applications: Boiler Plate, pressure Vessels Plate, Pressure Enclosure.

HYDROGEN EMBRITTLEMENT CAUSES, EFFECT & MATERIAL SELECTION.

Hydrogen Embrittlement is the phenomenon in which ductile material absorbs the hydrogen and become Brittle over the period of time.
hydrogen is induced in metal in so many different ways. during forming process, corrosion process alternate stress cycle process get internal and external process material is responsible for hydrogen deposit.

Once the hydrogen get induced in the material which cause the material became harder and harder over the period of time, alternate stress cycle on the material leads the crack propagation and brittle fracture is happens in the ductile material.
prevention are taken in such cases, for Hydrogen Embrittlement environment the material hardness value plays significant role, usually for that material hardness value kept low. this can be achieved during heat treatment process.

ASME SEC. II PART -D

This chart shows how pressure and temperature are affecting the material selection for the Hydrogen Embrittlement Environment.

HIGH PRESSURE SEALING FOR OIL AND GAS INDUSTRY.

Oil and gas industry have all piping and instrumentation network. Some of the network will expose to atmosphere and will cause corrosion and leaking. high pressure leaking will interrupt the process so we need to fixed that leaking with the help of enclosure and tubing , enclosure placed all the way around the piping and tubing act as a sealing object.

INDUSTRIAL PIPING SEALING TECHNIQUE.

The detail of the sealing is as below. the groove needs to be cut inside the enclosure to fit the tubing. as we tight the enclosure with desired torque value the tubing gets crush inside the enclosure and piping, will stop the leaking.

SEALING WITH THE HELP OF TUBING.

HOW PRESSURE WILL ACT IN DIFFERENT WAY.

Various pressure acts on the tubing in different way,  the main aim of the tubing is to resist the pressure and stick inside the groove.

UNC THREAD VS NPT TREAD.

In oil and gas industry, different types of thread connections are usually used to ensure the leak proof joint.
one of the most common thread connection is UNC & NPT.

• UN thread has two types. UNC & UNF

UNC means Unified coarse thread, UNF means Unified fine thread. both are same only difference is in their pitch. UNF has less pitch thread compare to UNC.

• NPT Thread

NPT means National Pipe Tapered. this is most common for high pressure applications and where leak proof solution is more important. 

the leak and tightening of the two suraface is done with the help of wedge action.