ST750GBDI03R31 Turbine Air Starter | Half Arc w/Straight Exhaust (60-150 PSI) | by Ingersoll Rand

ST750GBDI03R31 Turbine Air Starter | Half Arc w/Straight Exhaust (60-150 PSI) | by Ingersoll Rand

SKU:: ST750GBDI03R31
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Price: $4,414.34

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Description

Description

The Ingersoll Rand ST750GBDI03R31 is a genuine IR ST700-series inertia-engagement turbine air starter, sealed for compressed air or natural gas. It delivers up to 55 hp (41 kW) and 250 ft-lb (339 N·m) of breakaway torque at 150 psi, and Ingersoll Rand rates it for diesel engines from 16 to 130 liters. It has a half-arc (50%) turbine, 2.18:1 "B" gearing and an SAE No. 3 flange, and it drives a right-hand 12-tooth, 6/8 pitch code 31 pinion. Its turbine motor needs no lubrication, and the planetary gears run sealed in oil.

ST750GBDI03R31 Specifications

Ingersoll Rand ST750GBDI03R31 technical data
Manufacturer / series	Ingersoll Rand ST700 series (ST750 half-arc model)
Motor type	Turbine, 50% (half) arc, lube-free
Engagement	Inertia: the spinning pinion throws into the ring gear as the starter accelerates
Maximum power	55 hp (41 kW) at 150 psi
Breakaway torque	160 ft-lb (217 N·m) at 90 psi / 250 ft-lb (339 N·m) at 150 psi
Operating pressure	90 to 150 psi (6.2 to 10.3 bar)
Drive medium	Compressed air or natural gas ("G" = gas sealed)
Gear ratio	"B" gearing, 2.18:1; sealed, oil-lubricated planetary gears
Mounting	SAE No. 3 flange
Pinion (code 31)	12 teeth, 6/8 diametral pitch, 20° pressure angle
Rotation	Right hand (R)
Air inlet / exhaust	1-1/2 in. type J518C flange inlet (ST700-K166 inlet flange kit) / 4 in. NPT exhaust
Air consumption	1,300 scfm (614 L/s) at maximum power and 150 psi
Recommended engine size	Diesel engines from 16 to 130 L
Extended cranking (over 10 s)	Not rated (the ST900 and ST1000 series are)
Orientations	4 inlet, 4 exhaust and 16 drive-housing positions
Weight	62 lb (28.1 kg)
Lubrication	None required for the turbine motor
Service kits	ST700-TK1 tune-up kit, ST700I-TK6 inertia front-end kit, ST750R-TK2 (ST700-TK1 plus the ST750R-A53 right-hand motor assembly)

Performance by Supply Pressure

Ingersoll Rand publishes these figures for the ST750 with B gearing:

Supply pressure	Breakaway torque	Speed at max power	Max power	Flow at max power
90 psi (6.2 bar)	160 ft-lb (217 N·m)	1,950 rpm	30 hp (22 kW)	850 scfm (401 L/s)
120 psi (8.3 bar)	225 ft-lb (305 N·m)	2,100 rpm	45 hp (34 kW)	1,100 scfm (519 L/s)
150 psi (10.3 bar)	250 ft-lb (339 N·m)	2,350 rpm	55 hp (41 kW)	1,300 scfm (614 L/s)

ST750GBDI03R31 Dimensions

Dimension	Inches	Millimeters
Overall length to mounting flange	17-13/32	442.1
Inlet centerline to mounting flange	12-1/2	317.5
Drive projection beyond flange	5-9/64	130.6
Height	9-5/8	244.5
Width	6-7/8	174.6

Reference dimensions from Ingersoll Rand. Confirm critical clearances against the certified drawing before you fabricate brackets or plumbing.

Running on Natural Gas

An ST700-series starter (ST799GCDP03R31) piped for natural gas on a Waukesha F3521GU power generation engine. Photo: Ingersoll Rand.

The "G" in ST750GBDI03R31 means the starter is sealed for gas. On gas compression sites and pipeline stations, the ST750G can run on the same pipeline gas that fuels the engine. Ingersoll Rand's installation guidance for gas operation:

Pipe the starter exhaust (and any relief-valve outlet) away to a safe location.
Use gas-rated controls: the SRV150SS relay valve and the SMB-G618 push-button valve.
Set the regulator so the pressure measured at the starter never exceeds the maximum on the nameplate.

How to Read the Model Number

Code	Meaning
ST7	ST700 series turbine starter
50	Percent arc: 50% (half) arc (99 = full arc, 30 to 90 psi)
G	Gas sealed
B	Gear ratio 2.18:1 (C = 2.53:1)
D	Type of gear case
I	Inertia engagement (P = pre-engaged)
03	SAE No. 3 mounting flange
R	Right-hand rotation
31	Pinion: 12 teeth, 6/8 pitch
-XX (optional suffix)	Orientation code for the inlet, exhaust and drive housing. For non-standard positions, order "-POS".

ST750GBDI03R31 FAQ

Is the ST750GBDI03R31 still available, and what replaces it?

Ingersoll Rand's current turbine line for this engine range is the ST1000 series. The ST1000 equivalent of the ST750GBDI03R31 is the ST1060BI03R31. It is also inertia engaged, B ratio, SAE 3 flange and code 31 pinion, and it is sealed for gas and air. It delivers 70 hp at 150 psi. IR's supersession list moves the ST750GBDI03R31-2A configuration to the ST1060BI03R31S-2G. Call us and we will confirm current availability of the ST750GBDI03R31 and quote the ST1060 alternative side by side.

Can it crank for a long time?

Ingersoll Rand does not rate the ST750 for extended cranking (more than 10 seconds). If your engine needs long crank cycles, the ST1000 series is the better choice.

What air supply and accessories does it need?

Supply 90 to 150 psi through a 1-1/2 in. line, with enough receiver volume to deliver up to 1,300 scfm while the engine cranks. Ingersoll Rand's matching accessories are:

SRV150 1-1/2 in. relay valve for air, or SRV150SS for gas
ST900-267-24 1-1/2 in. strainer (300 mesh)
150BMP-1051B (12 V) or 150BMP-2451B (24 V) solenoid valve, or SMB-618 / SMB-G618 push-button valve
150BMP-1056 check valve, 150BMP-1067 drain valve and 150BMP-1064 pressure gauge

What engines does it fit?

Ingersoll Rand recommends the ST750 with B gearing for diesel engines from 16 to 130 L with SAE No. 3 starter pads and 12-tooth, 6/8-pitch, right-hand ring gear engagement. Look up your engine in our Air Starter Model Finder, or call us with the engine model and serial number and we will confirm fit.

Buy from a Factory-Authorized Ingersoll Rand Distributor

AirStartersDirect.com is a factory-authorized Ingersoll Rand distributor operated by Zampini Industrial Group, which has supplied engine starting equipment since 1987. Every ST750GBDI03R31 we sell is new, genuine Ingersoll Rand equipment. We also supply the ST700 and ST900 series, the current ST1000 series, and the relay valves, strainers and tune-up kits that go with them.

Need help confirming fit? Call 1-800-353-4676 with your engine make, model and serial number for a fast quote and free selection help.

Specifications source: Ingersoll Rand Engine Starting Systems catalogs, ST700/900 series, and Ingersoll Rand vane and turbine air starters.

Ingersoll Rand pneumatic air starters can replace any factory mounted starter engine and simultaneously offer a variety of helpful benefits. Compared to conventional electric starters, a pneumatic air starter occupies considerably less space as it is run by air. Pneumatic air starters are also considered safer in hazardous environments as they do not produce electrical sparks like electric starters sometimes do, thus eliminating the risk of igniting flammable materials that may be present.

Ingersoll Rand air starters have significantly more torque than electric starters of equivalent size, and that allows even a small air starter to start very large engines and turbines. In addition, electric starters as well as their wiring may become excessively hot in the event that it takes longer than expected to start the engine, while air-starters can be run for as long as their air supply lasts. Turbine starters provide even more torque and tend to be simpler, and therefore are a natural fit for turbine engines. Turbine air starters are utilized extensively on large turbofan engines commercial and military aircraft; as well as marine ships and vessels, trains, heavy construction equipment, and more.

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