Emerson VSG & VSSG Specifications download pdf (Page 8)

Critical Applications Guidelines

To ensure the successful operation of the VSG compressor, the guidelines described below

should be followed.

1. Proper lubrication is critical to the operation of the VSG compressor. The compressor relies on

the injected oil to absorb and remove the heat of compression, to seal the compression chambers

formed in the flutes of the screw, and to lubricate all moving parts. For this reason, it is impera-

tive that the oil chosen be of correct viscosity, and that sufficient oil flow be provided at all times,

using an auxiliary oil pump when necessary. The oil chosen must be compatible with the process

gas as well, to prevent absorption of the gas into the oil, which would dilute the oil and reduce the

viscosity. Also, oil filtration to 25 micron nominal particle size is required to ensure that only clean

oil is injected into the compressor. For assistance in choosing the correct oil for the application

and in sizing an auxiliary oil pump, consult a Vilter representative.

2. Injection oil temperature must be closely controlled for optimum performance. Oil temperature

must be maintained a minimum of 15 - 20°F above the gas mixture dewpoint at anytime to prevent

condensation or liquid knockout from occurring within the compressor.

Gas composition plays a role in the performance of the VSG compressor as well. While the VSG is

capable of handling a wide variety of gases, it is required that the concentration of H

S in the pro-

cess gas not exceed 100 PPM. If H

S is present in the process gas in any concentration, special oil

additives are required to protect the compressor from corrosion.

Notice on using Non -Vilter Oils

Oil and its additives are crucial in refrigeration system performance. Vilter Manufacturing will NOT

APPROVE non-Vilter oils for use with Vilter compressors. Due to the innumerable choices available

it is not possible for us to test all oils offered in the market place, and their effects on our equipment,

as we can with our own lubricants.

We realize that customers may choose compressor lubricants other than Vilter branded oil. This is

certainly within the customers’ right as owners of the equipment. When this choice is made, however,

Vilter is unable to accept responsibility for any detrimental affects those lubricants may have on the

equipment or system performance and durability.

Should a lubrication related system issue occur with the use of non-Vilter oils, Vilter may deny war-

ranty upon evaluation of the issue. This includes any parts’ failure caused by inadequate lubrication.

Certainly, there are many good refrigeration lubricants in the market place. The choice of a lubricant

for a particular application involves consideration of many aspects of the lubricant and how it and its

additive package, will react in the various parts of the entire refrigeration system. It is a complex choice

that depends on a combination of field experience, lab and field-testing, and knowledge of lubricant

chosen. Vilter will not accept those risks other than for our own compressor lubricants.

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Emerson VSG & VSSG Specifications Page 8