TDI TURBOTWIN™
FROM TECH DEVELOPMENT
Publication: T1-797
Issued: August 20, 2008
Page 8
packagepiping &at new siteinstallations. Therefore,
at commissioning (before running Motors), TDI
recommendsa “blow-down”proceduretopurgeMotor
supply lines of all hard debris that may otherwise
damage the Motor severely. While T100
TURBOTWIN Motors are highly tolerant of
contamination in the air/gas supply, Motor life can be
greatlyincreased by usingacoarsemesh strainer. At
sites where dirty supply air/gas is present, use &
maintenance of a #40 mesh Y-strainer, upstream of
the Motors, is highly recommended.
NOTE
Expensive moisture abatement (air/gas drying) is not
required, as this has no effect on the Motors.
2.3 MOTOR CONTROLS
A preferred Motor supply control valve is typically a
pilot-operated type, which can be pneumatically or
electrically actuated. The valve should be located
relatively close to the Motor inlet, to prevent Motor
over-running at the end of the cycle.
CAUTION
Proper supply pressure “matching” and over-speed
control is highly recommended on all installations of
Models T100MS (See section 2.5)
Do not use max supply pressure indications only, as a
method to properly set the Motors’ supply pressure. A
pressure regulator is required, where dynamic air/gas
Motor supply pressure is great enough to exceed the
Motor operating pressure (at the inlet port) and/or
where a “default” supply pressure (e.g. engine fuel
gas pressure) would produce Motor output speeds
beyond what is specified for the application.
(Result is over-speed, not necessarily an indicated
over-pressure). Both over-pressure & over-speed
will reduce life of Motors/pumps & wastes supply
air/gas (increases operating costs).
2.4 INLET PRESSURE CHECK PORT
(checking dynamic operating pressures)
A 1/4" NPT port is located on theMotor housing,under
the air inlet. This port can be used to check the supply
pressure at the Motor when the Motor is operating. To
check dynamic pressure, remove the 1/4" NPT pipe
plug and save for later use. Install a pressure gauge to
read at this port. Using Loctite Pipe Thread Sealant or
equivalent, replace¼” NPT pipeplugwhendone. This
pressure monitoring line/gauge may also be
permanently installed. Alternately, a pressure
transducer may be installed at the pressure check port
and electrical lines routed to a digital display or panel
at the operator's station.
2.5 MATCHING MOTOR OUTPUT (SPEED)
TO LOAD
It is recommended that all T100-MS Motors be
installed with a discrete Motor supply pressure
regulator. A hand held tachometer should be used to
double-check Motor output speeds. Motor supply
pressure should be set at the minimum pressure
required to insure the Motor runs the speed/load
required by the application. Oil Pump discharge
pressure may not indicate excessive motor speed,
since an oil bypass (relief valve) may reduce this to a
indicate a “normal” oil pressure reading.
Donot applythe maximum Motorsupply pressureonly
by default, (such as default fuel gas pressure on the
package). As indicators of Motor speed & output, this
typically does not account for:
Varyingfuel gaspressures (on variousturbine
engine models)
Varying oil pumps, oil types & loads.
Varying site conditions (temperatures, etc…)
Varyingoil pressures (wet-sealoilpressurevs.
lube oil pressures) & cycle times required.
NOTE
Motor over-pressure (even where Motor supply
pressure minimally exceeds that needed for pump
loads, may result in pumps turning faster than
necessary of a.k.a. “over speed.” In this case simply
reducing Motor supply pressure will correct this.
This also reduces consumption and lowers supply
air/gas costs.
3.0 MOTOR OPERATION
WARNING
Do not operate the TDI TURBOTWIN Motor at
dynamic supply pressures greaterthan the pressure
rating on the nameplate. This dynamic pressure is
measured at the Motor inlet while the Motor is
running.
