s920012 StartingRequirements

GE Energy
Gas Engines Starting Systems
Air Volume and Pressure Guidelines For 12V/18V 220GL Engines with TDI Air Starters
Table 1. Engine Cranking Torque at 125 Engine RPM Curve 1. Accelerating Torque for Driven Equipment
TORQUE
MODEL 1000
1000 (738)
Nm lb-ft
12V220GL 1560 1150 800 (590)
800
TORQUE N•m (lb-ft)

18V220GL 2170 1600
600 (443)
Based on 21°C (70°F) ambient and use of SAE 40 lube oil.
600
Includes engine friction and accelerating torques. 400 (295)
400
Torque values specific to TDI 112V with standard muffler.
200 (148)
200
Table 2. TDI 112V Air Starter Torque Capability and
Consumption at 125 Engine RPM (values are specific to TDI 112V 0 0 50 100 150 200 250 300
with standard muffler). (171) (342) (513) (683) (854) (1025)
DYNAMIC AIR TYPICAL AIR

TORQUE
PRESSURE AT CONSUMPTION WR2 OF DRIVEN EQUIPMENT kg-m 2 (lb-in 2 / 1000)
(LB-FT)
STARTER INLET PER START
bar psig N•m lb-ft Nm3 scf NOTES:
6.9 100 2093 1544 2.31 82 1. The TDI air starter assembly used on the 220GL engine
family is only suitable for compressed air as the working
7.6 110 2389 1762 2.51 89 fluid. Do not use natural gas to drive the starter.
8.3 120 2655 1958 2.72 96 2. Assumed cranking time of 6 seconds for gas engines.
9.0 130 3009 2219 2.93 103
3. Use of lube oil heaters required when oil sump
temperature falls below 20°C (68°F) to maintain a
9.7 140 3333 2458 3.13 110 minimum oil sump temperature of 20°C (68°F).
10.3 150 3686 2719 3.34 118 4. Maximum dynamic pressure rating at inlet connection of
the TDI 112V starter is 10.3 bar (150 psig).
5. The TDI air starter assembly used on 220GL engines includes a
muffler. The values on this document are specific to the starter
TABLE 3. Typical Driven Equipment WR² for Waukesha* with muffler installed.
Enginator*
WR² ACCELERATING TORQUE
MODEL
(kg.m²) (lb.in²/1000) N•m lb-ft
APG2000 129 441 396 292
APG3000 156 533 479 354
Page 1 of 2
Ref.
Air Volume and Pressure Guidelines EN: 151915
S
For 12V/18V 220GL Engines with TDI Air Starters DATE: 3/11
9200-12
GE Energy
Gas Engines Starting Systems
INSTRUCTIONS / EXAMPLE:
To find the minimum required air pressure at the starter (bar), add the engine cranking torque from Table 1 and the accelerating torque
for the driven equipment from Table 3 to the friction torque of the driven equipment. From Table 2 select the minimum air pressure. Do
not interpolate between pressures. Use the next higher pressure.
To find the air consumption per start (Nm3), use the minimum air pressure at the starter (bar) from above and refer to Table 2.
3
(Req' d number of starts) x (Nm of air per start) x (Atmos. press., bar) 1000liters
Minimum Size of Air Receiver, liters  x
(Max. air receiver press., bar)  (Min. usable air receiver press., bar) 1 m3
EXAMPLE:
For this example, to minimize the air receiver size, it is recommended to use a high pressure air system (e.g. 17.3 bar) and regulate the air
pressure down to the needed pressure selected from Table 2. To minimize piping pressure losses, mount the regulator as close as possible
to the air starter.
GIVEN INFORMATION
 18V220GL engine
 20°C ambient
 Driven equipment is a generator (include all driven equipment i.e. rotor, fan, coupling, exciter, and disc)
 WR2 = 156 kg m2 (NOTE 1)
 Generator friction torque = Negligible

Maximum air receiver pressure = 17.3 bar (NOTES 1, 2)
 Piping pressure loss = 1.5 bar (NOTE 1)
 Number of starts required = 4
 Atmospheric pressure = 1.01 bar (NOTE 1)
 Air driven TDI 112V starter with muffler
NOTES:
1. These values are site specific and shown quantities are only an example. Site value for piping pressure loss will be heavily
dependent on starting air system design, such as location of air supply tanks, diameter of plumbing, distance from receiver to
starter, number of bends, etc.
2. This max air receiver pressure must be regulated down to the needed pressure given in Table 2.
SOLUTION:
 Engine cranking torque, N•m = 2170 (Table 1)
 Driven equipment accelerating torque, N•m = 479 (Table 3)
 Generator friction torque, N•m ~ 0 (Given)
 Total cranking torque, N•m = 2170 + 479 + 0 = 2649
 Minimum air pressure at starter bar = 8.3 (Table 2 – Note use of next higher pressure)
 Typical air consumption per start, Nm3 = 2.72 (Table 2)
 Minimum (regulated) usable air receiver pressure equals minimum air pressure at starter plus piping pressure loss,
bar = 8.3+ 1.5= 9.8.
THEN: Minimum air receiver size
4 x 2.72 x 1.01 1000liters
liters  
17.3 9. 8  1m
3
liters = 1465
With a 17.3 bar system regulated down to 8.3 bar at the air starter inlet, use a 1500 liter air receiver or closest combination of sizes at a
minimum.
NOTE: If adverse starting conditions will be commonly encountered, increase the size of the receiver by 25%. Recharge of the air
receiver between starts is neglected.
*Trademark of General Electric Company. All other trademarks are the property of their respective owners.
Page 2 of 2
Ref.
Air Volume and Pressure Guidelines EN: 151915
S
For 12V/18V 220GL Engines with TDI Air Starters DATE: 3/11
9200-12

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GE Energy

Gas Engines Starting Systems

TORQUE N•m (lb-ft)

DYNAMIC AIR TYPICAL AIR

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