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RECEIVING, HANDLING AND

STORAGE

ROOTS

Rotary Positive Displacement Gas Meters are

precision measurement instruments. Although of very

rugged construction, reasonable care should be given

during handling and storage.

At time of delivery

Check the packing list to account for all items

received.

Inspect each item for damage

Record any visible damage or shortages on the

delivery record

• File a claim with the carrier

• Notify your ROOTS

IMPORTANT NOTES

• Do not accept any shipment with evidence of

mishandling in transit without making an

immediate inspection for damage and checking

each meter for free rotation of the impellers.

All new meters should be checked for free rotation

soon after arrival since damage to internal working

parts can exist without obvious external evidence.

• Should any serious problems be encountered during

installation or initial operation of the meter, notify

your ROOTS

Meter supplier immediately.

• Do not attempt repairs or adjustments, as doing so

may be a basis for voiding all claims for warranty.

• If the meter is not tested or installed soon after

receipt, store in a dry location in the original

shipping container for added protection. Make sure

the box remains horizontal with the arrow pointing

up. Leave the protective caps installed on the meter

nipples. The caps will provide reasonable protection

against dust.

• When reporting a suspected problem, please provide

the following information:

• Your Sales Order Number and/or Dresser's

Order Number

• Meter Model, Serial Number and

Bill of Material Number.

• Description of the problem

• Application information such as gas type,

pressure, temperature, and flow characteristics

Our Product Services Department offers professional

services for all ROOTS

Products. Authorization for return

is required for all ROOTS

Products shipped to the Factory

for repair, calibration, warranty exchange or credit. To

obtain authorization for return of ROOTS

purchased from a Dresser Distributor or Representative

please contact the Distributor or Representative from

whom the product was purchased. Refer to our Return

Material Authorization procedure. All returns should be

packaged in an original-type shipping container.

Meter supplier immediately

Products

INTRODUCTION

Use and Limitations

The ROOTS

Meter is a positive displacement, rotary type

gas meter designed for continuously measuring and

indicating the accurate measurement of gas flow in a

pipeline.

ROOTS

Meters are suitable for handling most types of

clean, dry common gases at either constant or varying

flow rates. The meter is not suitable for handling liquids

or for handling acetylene, biogas or sewage gas.

Measurement accuracy and life expectancy can be imped-

ed by excessive deposits of dirt or other types of foreign

material present in the gas stream.

Operating Principle

As shown in Figure 1, two contra-rotating impellers of

two-lobe or "figure 8" contour are encased within a rigid

measuring cartridge, with inlet and outlet connections on

opposite sides.

Figure 1

The measurement cartridge is encased in an aluminum

housing. Precision machined timing gears keep the

impellers in correct relative position. Optimal operating

clearance between the impellers, cylinder, and headplates

provide a continuous, non-contacting seal.

Because of this unique design, the gas at the meter inlet

is always effectively isolated from the gas at the outlet.

Consequently, a very small pressure drop across the meter

will cause the impellers to rotate.

During impeller rotation, the precisely machined measur-

ing cylinder traps a known volume between the impeller

and the adjacent cylinder wall. With one complete

revolution of both impellers, the meter will measure and

pass four equal gas volumes. The sum total of these

volumes is the Displacement of the meter per revolution.

The displaced volume of gas is indicated in Engineering

units represented in cubic feet (or cubic meters).

Volumetric accuracy of the ROOTS

and nonadjustable. Measuring characteristics are

established by the dimensions and precision machined

contours of non-wearing fixed and rotating parts.

Meter rated capacity is the maximum flow rate at which

the meter may be operated and is determined by the

dynamic loads acting on the rotating parts of the meter.

These loads are primarily related to meter RPM, and

secondarily to the metering pressure. With few exceptions,

the standard volume capacity of rotary meter increases

directly with changes in absolute line pressure and

inversely with changes in absolute line temperature.

Meter is permanent