Category: CORROSION

API 510, CORROSION, OIL & GAS1 Comment

What is Cooling tower in refinery plant

Amarine Antonio

Relate topic: What is CUI – Corrosion under insulation and on Cooling tower Cooling Tower Work;  Cooling Tower to do evaporation of some water in the water system ( the Cooling the Water) cool by spraying (for Spray). Hot Cooling Water to flow through the air against the Packing to increase the contact surface between water and air. When the water and the air come in contact with each other, some water will evaporate and cool the cooling water. Cooling Tower Component;  The main components of Cooling Tower include exhaust fans, pipes and fittings for the Spray Water Cooling water, Pack to … Continue reading What is Cooling tower in refinery plant

API 510, API 570 - PI, CORROSION1 Comment

What is CUI – Corrosion under insulation on Cooling tower

Amarine Antonio

CUI Locations Guideline in Vertical Vessel;  The potential area for Corrosion Under Insulation (CUI) is the area where water can be trapped in the insulation or fireproofing. For the vertical vessel, there is a risk point as in the picture. Critical Factors a) It affects externally insulated piping and equipment and those that are in intermittent service or operate between: 1) 10°F (–12°C) and 350°F (175°C) for carbon and low alloy steels, 2) 140ºF (60°C) and 400ºF (205°C) for austenitic stainless steels and duplex stainless steels b) Corrosion rates increase with increasing metal temperature up to the point where the water … Continue reading What is CUI – Corrosion under insulation on Cooling tower

API 510, API 570 - PI, CORROSION, OIL & GAS5 Comments

Erosion in Refinery, Petrochemical Plant

Amarine Antonio

Case I: Erosion in Pipeline Branch of line Medium pressure (MP) steam is separated to Steam trap occurs near Elbow ( the Elbow) at the point of impact of the Flow by Steam flow in Line that runs Steam trap that resembles a Two-phase.   Case II: Erosion at the opposite tee fitting of the Low-pressure (LP) steam condensate pipe is caused by the two-phase flow (Flash steam + Liquid condensate) from the pipes that condensate from the steam trap that is combined. Case III: When Liquid Condensate runs through the Control valve, some are turning to Flash steam becomes Two-phase flow and flow turbulence ( Turbulent) resulted from Erosion , especially at the point of impact on the joints of the various (Elbow, Tee).   Continue reading Erosion in Refinery, Petrochemical Plant

CORROSION, WELDING METALLURGYLeave a comment

Hardness requirement in Sour service for (Duplex) Stainless steel

Amarine Antonio

Section 7, Table 7-11 of DNV Standard OS-F101 October 2010 – Submarine pipeline systems – provides HV10 limits for weldments in 22Cr and 25Cr duplex stainless steels for line pipes. For 22Cr and 25Cr duplex, the hardness in the weld and HAZ shall not exceed 350HV10 and the base material shall not exceed 290HV10 for 22Cr, and 330HV10 for 25Cr. Section 6, paragraph B201 of DNV Standard OS-F101 October 2010 states that materials shall be selected for compliance with ISO 15156. NORSOK Standard M-630 Rev.4 January 2004 – Material data sheets for piping – included material requirements in the form … Continue reading Hardness requirement in Sour service for (Duplex) Stainless steel

CORROSION, OIL & GAS, PIPINGLeave a comment

What is Engineering Critical Assessment (ECA)?

Amarine Antonio

What is an ECA? Most welding fabrication codes specify maximum tolerable flaw sizes and minimum tolerable Charpy energy, based on good workmanship, i.e. what can reasonably be expected within normal working practices. These requirements tend to be somewhat arbitrary, and failure to achieve them does not necessarily mean that the structure is at risk of failure. An Engineering Critical Assessment (ECA) is an analysis, based on fracture mechanics principles, of whether or not a given flaw is safe from brittle fracture, fatigue, creep or plastic collapse under specified loading conditions. An ECA can, therefore, be used: During design, to assist … Continue reading What is Engineering Critical Assessment (ECA)?

CORROSION, MACHINERY, PIPING3 Comments

Pipe Flushing (Full procedure, standards NAS, Filter selection, magnetic filter config.)

Amarine Antonio

There is two type of flushing as below which are enough for pipelines flushing. 1. Chemical flushing (pickling). 2. Oil flushing. CHEMICAL FLUSHING (PICKLING) The purpose of chemical flushing is to remove any dirts, debris, oil, grease, rust, scale, ect form the pipelines. During … Continue reading Pipe Flushing (Full procedure, standards NAS, Filter selection, magnetic filter config.)

CHEMICAL TANKER, CORROSION, PIPING1 Comment

Passivation of Stainless steel

Amarine Antonio

It’s well known that the SUS materials (piping) very often demand a final step of surface treatment, i.e. passivation, in order to achieve a product with acceptable visual appearance and high corrosion resistance. The passivation process removes chips and “free iron” contaminations left behind on the surface from different fabrication operations. These contaminants are potential corrosion sites that may result in premature corrosion and ultimately in deterioration of the component if not removed. There many argument and penalty during chemical tanker building with those relating to Painting schedule and Passivation quality. All the jobs are conflicted and much delayed on … Continue reading Passivation of Stainless steel

CORROSION, HULL, SHIP SURVEY2 Comments

PSPC – Performance Standard for Coating of Ballast Tanks – Part 1

Amarine Antonio

History briefs: In 2002, TSCF published “Guidelines for Ballast Tank Coating Systems and Surface Preparation” provided differing levels of standards for minimum target coating life of 10, 15 and 25 years (denoted as TSCF10, TSCF15, and TSCF25). In order to address the same issue for all vessels, in 2006 IMO adopted Resolution MSC 215(82) “ Performance Standard for Protective Coatings for Dedicated Seawater Ballast Tanks in all Types of Ships > 500GT and Double-Side Skin Spaces of Bulk Carriers >150m ” (commonly referred to as PSPC). This resolution came into force in 2008. PSPC is intended for a minimum target coating life of … Continue reading PSPC – Performance Standard for Coating of Ballast Tanks – Part 1