M-N-O

بدضعیفمتوسطخوبعالی (بدون رتبه)
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M

M3/min ANR (also M3/hr ANR):
Volume flow rate measured in cubic metres per minute (or per hour) related back to ANR conditions.

Mayonnaise:
The oily condensate discharged by lubricated air compressors. The name is derived from the appearance of the condensate. Under normal conditions oily condensate should just be cloudy, like a small amount of milk in a bucket of water. When a lubricated compressor goes wrong, then the condensate becomes thick and sticky. In fact almost identical in appearance to the name it has been given.

Minimum Ignition Energy (MIE):
The minimum energy required to produce a spark strong enough to ignite an optimum concentration of material and air, under optimum atmospheric conditions. The MIE will reduce as the temperature and pressure of the mixture increases.

Modulating Control:
A description of the intake control system fitted to a compressor where the inlet valve hunts and throttles so that the amount of air delivered matches the demand. Similar to a butterfly valve being half shut so that it reduces flow.

Montreal Protocol:
Signed in 1987 in Montreal Canada, the protocol originally aimed to reduce the production of ozone deleting chemicals by 35% by 1999. The protocol was reviewed in 1992 (under the Vienna Convention for the Protection of the Ozone Layer) and various amendments plus another 11 chemicals were added to the list. The revised agreement resolved to stop the manufacture of ozone depleting chemicals within developed countries by the year 2000.

Multi-Stage:
An air compressor is not very efficient if you attempt to compress the air from (say) atmospheric pressure to 7 barg in one go. It is better to compress the air in two or more goes (called a stage), cooling the hot air between the stages. A compressor which reaches the final working pressure using two or more stages of compression is called a multi-stage compressor. Generally speaking, two stage compression is better than one. Three stage is even better.

N

N cu m/min (also N cu m/hr):
Volume flow rate measured in normal cubic metres per minute (or hour), i.e. related back to normal inlet conditions.

NTP:
Normal Temperature and Pressure. This is based upon a temperature of 32 deg F (0 deg C) and a pressure of 1 bara.

O

Oil-free:
The term generally applies to the condition of the air either when it leaves the compressor, or after filtration. An oil-free compressor will have no lubrication on the compression side of the machine. However this may not result in oil-free compressed air, simply due to the fact that the ambient air being sucked into the compressor will contain hydrocarbons which will condense into liquid oil further down stream.

Oil-less:
A term applied to compressors that contain no oil. A small reciprocating compressor with PTFE piston rings and PTFE bearer rings, sealed for life bearings and no sump oil would be called an oil-less compressor.

Ozone Depletion Potential:
Not to be confused with Global Warming Potential. Ozone depletion is caused by a particular group of gases, such as refrigerants, that enter the upper atmosphere and destroy the ozone layer. ODP is a yardstick that uses CFC11 as the base for comparison between various gases. The banned refrigerant, CFC11 = 1. The following table clearly shows the differences between ODP and GWP.

Ozone Secretariat:

This is the Secretariat for the Vienna Convention for the Protection of the Ozone Layer (in accordance with Article 7), and the Secretariat of the Montreal Protocol (in accordance with Article 12). It is based at the UNEP offices in Nairobi, Kenya and its main duties are to arrange and service meetings of ‘The Conference of the Parties’, arrange for the implementation of decisions, monitor implementation, receive and analyse data and to provide information.

Substance O.D.P.
G.W.P.
CFC11 1 4000
CFC12 1 8500
CFC13 1 11700
CFC14 1 1400
HCFC22 0.05 1700
Carbon Tet. 1.1 1400
1,1,1,-Thrich. 0.1 110

Ozone Secretariat:
This is the Secretariat for the Vienna Convention for the Protection of the Ozone Layer (in accordance with Article 7), and the Secretariat of the Montreal Protocol (in accordance with Article 12). It is based at the UNEP offices in Nairobi, Kenya and its main duties are to arrange and service meetings of ‘The Conference of the Parties’, arrange for the implementation of decisions, monitor implementation, receive and analyse data and to provide information.

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