Piping Related Abbreviations F-M


FF is an abbreviation of Flat Face flange.
The Flat Face flange has a gasket surface in the same plane as the bolting circle face. Flat Face does not feature the raised face of heavy duty flanges such as ANSI B 16.5 for example. Applications using flat face flanges are frequently those in which the mating flange or flanged fitting is made from a casting.


FFS is an abbreviation of Fitness For Service.
Fitness For Service assessments help determine if equipment is safe and fit for continued operation. It prevents breakdowns, minimizes risk and avoids costly repairs.


FoF is an abbreviation of Flange of Face.
This terminology is used when dimensions have to be given with respect to face of flange.


FFW is an abbreviation of Field Fit Weld.
A field fit weld indicates that the designer has foreseen that the piping may need adjustment in the field so has added an extra length of pipe at a buttweld fitting or flange. The pipe end will be bevelled and welded on site after the installer determines the correct dimensions.


GMAW is an abbreviation of Gas Metal Arc Welding.


GTAW is an abbreviation of Gas Tungsten Arc Welding.


The finished product from a manufacturer (the pipe or fitting mill), is typically traceable to a Heat Number (steel mill identification). A heat typically identifies material produced in the steel mill from one single melt, and the number will be assigned in the steel mill. Chemical analysis is usually reported on a heat basis. Parts of a same heat have the same chemistry.


HAZ is an abbreviation of Heat-Affected Zone.
Cutting processes that use intense heat, like oxyfuel cutting and plasma arc cutting, produce thermal effects near the edge of the cut that lead to microstructural and metallurgical changes in the metal. The portion of a metal work-piece that has been so altered by heat is termed the heat-affected zone or HAZ. All thermal cutting processes create an HAZ in the cut metal.


ISBL is an abbreviation of In Side Battery Limits.
ISBL is functional-based and refers to equipment and other components that are solely dedicated to a single process whether or not the equipment is physically located within the geographical boundaries of the unit.


ITP is an abbreviation of Inspection Test Plan.
An Inspection Test Plan (ITP) is a commonly required document that you'll need to submit with your construction quality control plan. Whether you're working on a private sector or government contract, clients today all want to see your inspection test plan. They want to know exactly what inspections and tests you'll be forming to control quality on their project.


LR is an abbreviation of Long Radius Elbow.
Elbows are split into two groups which define the distance over which they change direction; the center line of one end to the opposite face.
This is known as the "center to face" distance and is equivalent to the radius through which the elbow is bent.
The center to face distance for a Long Radius elbow, abbreviated LR always is 1.1/2 x Nominal Pipe Size (1.1/2D), while the center to face distance for a Short Radius elbow, abbreviated SR even is to nominal pipe size.


MAOP is an abbreviation of Maximum Allowable Operating Pressure.
The Maximum Allowable Operating Pressure is the maximum pressure that can be safely operated by a pipeline. The thickness of the wall, pipe outer diameter, and Specified Minimum Yield Stress are used to calculate the MAOP of a pipe.


MAWP is an abbreviation of Maximum Allowable Working Pressure.
The Maximum Allowable Working Pressure of a boiler carrying the ASME Code symbol or of a pressure vessel carrying the ASME or API-ASME symbol shall be determined by the applicable sections of the code under which it was constructed and stamped. Subject to the concurrence of the enforcement authority at the point of installation, such a boiler or pressure vessel may be rerated in accordance with the rules of a later edition of the ASME Code and in accordance with the rules of the National Board Inspection Code or API 510, as applicable.
For example; the maximum allowable working pressure of a steam boiler is an absolute restriction of pressure within psig unit for a steam boiler is allowed to run. The ASME BPV Code (American Society of Mechanical Engineers Boiler and Pressure Vessel) says that absolutely no steam boiler should be run at a pressure above the MAWP with the exception of the safety valve is operated to discharge excessive pressure. Steam boiler has some technical terms that be generally used. One of them is MAWP (Maximum Allowable Working Pressure) which means that all of working pressure at the pressure part shall not exceed MAWP.


MIG is an abbreviation of Metal Inert Gas.
Metal Inert Gas or Gas Metal Arc Welding (GMAW) is frequently referred to as MIG welding. MIG welding is a commonly used high deposition rate welding process. Wire is continuously fed from a spool. MIG welding is therefore referred to as a semiautomatic welding process.


MOV is an abbreviation of Motor Operated Valve.
A motor operated valve uses an electric motor to open and close the valve. The motor is connected to the valve stem, which moves the closing element of the valve to change the flow of fluid through the valve when the motor is activated.


MPI is an abbreviation of Magnetic Particle Inspection.
It is a nondestructive examination method to locate surface and subsurface discontinuities in ferromagnetic materials. The presence of discontinuities is detected by the use of finely divided ferromagnetic particles applied over the surface. Some of these magnetic particles are gathered and held by the magnetic leakage field created by the discontinuity. The particles gathered at the surface form an outline of the discontinuity and generally indicate its location, size, shape, and extent.


MTO is an abbreviation of Material Take-Off.
A final material take-off is a accurate list of ALL the required piping items of a project in tabulated form.

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