Corrosion inhibitor examples

This type of corrosion inhibitor acts by forming a protective oxide film on the surface of the metal. What are reversible inhibitors? It causes a large anodic shift that forces the metallic surface into the passivation region, which reduces the corrosion potential of the material. Some examples are chromates , nitrates , molybdates , and tungstate.

Examples for Cathodic Inhibitors include sulfite and bisulfite ions which can react with oxygen to form sulphates.

Another example of a cathodic inhibitor is a catalyzed redox reaction by nickel. These types of corrosion inhibitors form a thin preventive oxide layer on the surface of the metal. Types of corrosion inhibitors: Anodic inhibitors react with oxygen to form a thin film on the surface of the metal. They reduce the corrosion potential of the material by oxidizing a surface layer that is less reactive to corrosive elements.

Cathodic inhibitors slow the cathodic reaction itself or limit the diffusion of reductive elements such as hydrogen or oxygen to the metal surface. Examples are cathodic poisons such as arsenic and selenium ions which slow the reaction or oxygen. In this example, hydrazine converts oxygen , a common corrosive agent, to water, which is generally benign.

Questionnaire sample doc

What Is a Questionnaire ? A questionnaire is a set of questions written to acquire qualitative or quantitative data from specific respondents. The question made are given choices of , one being the best answer among the rest or only one answer considered as true. If you are seeking for a business questionnaire sample , then this document is the best professional sample questionnaire available for you. Do analyze this sample business document and get the idea of drafting a custom questionnaire.

You may also see leadership self assessment.

A questionnaire template enables an organization or department to know the satisfaction levels of a product or service from the customers. They provide reliable information and avoid speculative data. Choosing Your Template By The Questions Your Survey Asks.

If you’re getting ready to design a questionnaire , you will want to know some of the basics about survey design. The type of questions you will be asking your participants will decide the design of your survey and questionnaires , in part. To escape from the hassles of making your questionnaire , you can just refer to and download our high-quality templates.

Pressure regulator how it works

A pressure regulator limits excess inlet water pressure to a constant outlet pressure. They accomplish this by automatically modulating their area of opening and keeping outlet pressure within acceptable limits. A water pressure regulator is a plumbing valve that reduces the water pressure coming from the main water line into the house.

This valve brings down the pressure to a safe level before the water reaches any plumbing fixtures inside the home. A key component of the instrument air supply system is an air pressure regulator. The air pressure regulator is a simple device. Dome Loaded: The Equilibar is a dome-loaded pressure regulator with pilot operation.

This means that gas or air is fed into the top (dome) area of the regulator to provide the pressure setpoint for the process. The pressure of the gas in the dome is set by a secondary standard regulator called a pilot regulator. This return line is located downstream of all the injectors. What is a Fuel Pressure Regulator and how does it work ? A fuel pressure regulator is used to maintain steady fuel supply, even during dramatic changes in fuel demand.

The fuel injector has two sides, one side of the injector is under pressure from the the fuel rail and the other side is air boosted by a turbo or a compressor. Regulators are used for gases and liquids, and can be an integral device with an output pressure setting, a restrictor and a sensor all in the one body, or consist of a separate pressure sensor, controller and flow valve.

Laser alignment procedure

Definition: Nominal Hazard Zone (NHZ) – The area where the laser radiation can cause damage to the eye or body, i. LASER ALIGNMENT GUIDELINES In the research setting, over of all laser accidents occur during the alignment process, therefore alignment procedures are very important and should be strictly adhered to. The following is a guide for developing specific alignment procedures for a Class 3B or Class laser system. Laser alignment is an essential component of a viable maintenance.

Steps to a Proper Machinery Alignment.

Laser Shaft Alignment Shaft alignment , often called “coupling alignment” , is a process to make two or more rotating shafts co-linear, or in the same straight line, both vertically and horizontally. Set up laser alignment system. Measure, diagnose, and correct Soft Foot with the assistance of the laser system and feeler gauges.

Measure and correct alignment of the machine to achieve the final alignment to the required targets within tolerances. Print the report to document the alignment. Laser pulley alignment systems are now well established in the sheave alignment field , and have proven themselves in greatly reducing downtime and the manpower needed to do the alignment , while simultaneously achieving far greater accuracy.

Grp pipes specification pdf

GRP Pipe Specification – Drinking Water FW. This specification defines the minimum technical requirements for the design, fabrication and testing of glass fibre reinforced plastic ( GRP ) pipe and fittings intended to be used for water supply (drinking or raw) with or without pressure. Vacuum piping , duct and O-ring gasketed joint piping will normally be wound at greater winding angles, such as 65°, to increase the hoop strength. GRP pipe is approved supply to industries worldwide, including drinking water supply, industry water supply, wastewater supply, sea water supply, electrical processing, chemical processing, agriculture processing and other type of supply as per customer requirement. Each layer of the pipe wall has a specific function.

EBS, GRP pipes eliminates need for expensive pipe handling equipment.

COUPLING Sleeve couplings combined with gaskets. Both glass-fiber-reinforced thermosetting-resin pipe (RTRP) and glass-fiber-reinforced polymer mortar pipe (RPMP) are fiberglass pipes. This standard is suited primarily for pipes to be installed in buried applications, although it may be used to the extent applicable for other installations such as, but not limited to, jacking, tunnel lining and slip-lining and rehabilitation of existing pipelines.

Electromagnetic force

The electromagnetic force is one of the four known fundamental forces. The other fundamental forces are: The other fundamental forces are: the weak nuclear force , which binds to all known particles in the Standard Model , and causes certain forms of radioactive decay. The EMF holds electrons in their orbit around the nucleus.

What does electromagnetic mean? These electrons interact with other electrons to form electron bonds among elements and produce molecules an eventually, visible matter.

The force arising from the attractions and repulsions associated with electric and magnetic fields. Understanding how it works gives you an appreciation of everything from the electricity powering your screen to the light transmitting these words to your eyes. Along with gravity, it is the force that humans encounter most on an everyday basis, and it explains most of the phenomena with which people are familiar.

It has the ability to attract and repel charges. Since material in solid and liquid forms are made of charges having a unique order, they, too, may be manipulated by this force. In fact, the forces of electric attraction and repulsion of electric charges are so dominant over the other three fundamental forces that they can be considered to be negligible as determiners of atomic and molecular structure.

Explosive remnants of war

Explosive remnants of war Every year, large numbers of civilians are killed and injured by explosive remnants of war – unexploded shells , grenades, bombs, etc. Convention on Certain Conventional Weapons is a major advance in efforts to end the suffering caused by unexploded and abandoned munitions. Under the international legal definition, ERW consist of unexploded ordnance (UXO) and abandoned explosive ordnance (AXO), but not mines.

It is the fifth Protocol to the Convention on Prohibitions or Restrictions on the Use. While the term has not been specifically define it is understood by the ICRC to correspond to the term unexploded ordnance (UXO) which has been defined in several contexts.

UXO refers to bombs, rockets, grenades, mortars and other types of explosive weapons which have failed to explode when fired or on impact. Often they are referred to as Unexploded Ordnance (UXO). Explosive Remnants of War (ERW) Definitions Introduction The term Explosive Remnants of War (ERW) has been widely used in the CCW Review Conference preparatory discussions. WLP helped fund the Mine Action Visitors Center in Dong Nai, Vietnam built and operated by Project Renew.

The Explosive Ordnance Disposal (EOD) team partook in a number of excercises, as part of the International Day of Mine Awareness, in order to draw attention to the large number of mines, unexploded ordnances (UXOs), and explosive remnants of war (ERWs) that still exist in the country.