What is PREN value for pitting corrosion?

Despite its inherent resistance to corrosion, stainless steel tubing installed in a marine environment suffers from different types of corrosion throughout its expected lifetime. Such corrosion can lead to fugitive emissions, lost product, and potential risks. Offshore platform owners and operators can reduce corrosion risks at the outset by specifying more robust tubing materials that offer better corrosion resistance. Later, they must remain vigilant in their inspections of chemical injection, hydraulic, and impulse lines, as well as process instrumentation and sensing equipment, to ensure corrosion isn’t threatening the integrity of the installed tubing and impacting safety. Localized corrosion can be … Continue reading What is PREN value for pitting corrosion?

What is Static equipment in Oil & Gas?

The majority of mechanical equipment found in oil and gas facilities belongs to the static equipment group, which comprises pressure vessels (drums, columns, reactors, filters) and heat exchangers (shell and tubes, plate and frame, air coolers). This article will contain cost-effective recommendations for design, materials, and fabrication. They aim to enable the inspector/surveyors/engineer/purchaser who is not an equipment specialist, to check that economical choices are made. The specification and selection of the equipment is the responsibility of the static equipment engineer, based on requirements specified by other disciplines, including process, materials and plant layout. Let’s start with the review of … Continue reading What is Static equipment in Oil & Gas?

What is water standards for hydrostatic testing?

Selection and Treatment of Water and Conduct of the Test, to Maintain the integrity of the System is a priority concern in new-building or construction project. Specially on Stainless-steel which is very sensitive to corrosion. 1.0 Introduction Welded fabrications are frequently tested hydrotested for pressure tightness. Unless properly conducted, this procedure can induce problems. It is important to avoid initiating corrosion of the fabrication by subjecting it to critical conditions outside the initial design constraints. Where the vessel is to handle materials which are later ingested, contamination must be avoided. Damage may be caused by the induction of latent corrosion … Continue reading What is water standards for hydrostatic testing?

Is Stainless Steel ferrous metal?

This question has been made through every year when the engineer concerning about ferrous or non-ferrous metal during making of welding procedure, permanent joint qualification or corrosion calculation. This article gives an overview of ferrous metals, what they are and how they’re made. There are several common types of ferrous metals such as mild steel, stainless steel and cast iron. Ferrous metals are highly versatile. Read this article to learn about their applications and advantages and disadvantages of ferrous metals Did you know? Iron is the most abundant element on earth. The earth’s core consists of an iron-nickel alloy that makes … Continue reading Is Stainless Steel ferrous metal?

Hydrostatic test with Flange Joints (considering of Flange MAWP)

As a common hydrostatic test procedure, the test pressure will be taken from the piping system MAWP.  Depending on the primary code applied, the test pressure can be 1.5 MAWP, or 1.3 MAWP + factors, or 1.15 MAWP… etc., Refer to What is MAWP, What is Max operation pressure, Hydrostatic test: What is the MAWP of the pressure vessel (ASME VIII) FITTING PRESSURE RATING PIPE PRESSURE RATING PIPING HYDRO-STATIC TEST COMPREHENSION Test Pressure vs MAWP (ASME VIII) Design Pressure Vs MAWP (API, ASME) MAWP is normally referred to as system maximum allowance working pressure. The fitting is small and is … Continue reading Hydrostatic test with Flange Joints (considering of Flange MAWP)

Guide to flange raised face repaired by machining.

Take a look at the requirements of the height of raised face as per ASME B16.5: ASME B16.5 Flange – Regular Raised Face Height Typically, the height of Raised Face of ASME B16.5 Flange is divided by Flange Class by: 1- Flange Class 150 and 300 which have the Raised Face Height around 2mm. 2- Flange Class 400 and above have Raised Face Height around 7mm. When damage occurs on Flange’s Raised Face, the method to repair without welding works as per ASME PCC-2 can be done by machine, removing the damaged parts and refinishing the Raised Face again. Then do MT … Continue reading Guide to flange raised face repaired by machining.