22HLX Series

NIIGATA, Japan's leading diesel engine manufacturer, develops another product resulting from continuous innovation: the 22HLX medium speed stationary diesel engine series.	The 22HLX guarantees high performance with a speed of 1 000 rpm or 900 rpm. Avaliable in five models: 6L, 8L, 12V,16V and 18V, the 22HLX is engineered to effectively burn heavy fuel up to 700 cSt at 50 degC
	Superior reliability and efficiency have been achieved in the 22HLX through careful research and design implementation. Among the outstanding features are the engine's monoblock hanger type crank case, induction hardened crank shaft with large diameter main and crank pin journals, horizontal-split connecting rods, segmented type (per cylinder) cam shaft, cooling system, as well as the intake air duct, main cooling water pipe and main lube oil pipe that have been integrated in the crank case.
Compared to the conventional diesel engine, the brake mean effective pressure of the 22HLX has been increased to 18%, and the mean piston speed raised 8%. Its output rate of 24.4 MPa.m/s is noted as the highest level in the world for this engine size.	Wider crank case doors, 4-stud cylinder heads, and the push rod system for the air intake and exhaust cam followers contribute to the engine's easy and simple maintenance.
Over the past 8 decades Niigata has delivered a total of over 20 million kWm of diesel engines worldwide. The 22HLX is another beakthrough: compact, high performance, high output and environment friendly, promising healthier returns on the customer's investment.

　

OPTIMIZED COMBUSTION EFFICIENCY
	* NCCS (Niigata Compact Constant Pressure Turbocharging System). * High maximum combustion pressure (Pmax) of up to 20 MPa. * Brake mean effective pressure of 2.44 MPa, mean piston speed of 10.0m/s. * Output rate of 24.4 MPa.m/s. * 147.1 MPa high pressure, short duration fuel injection system. * Cylinder liners equipped with fire rings. * Capable of burning low grade bunker fuel of up to 700 cSt at 50 degC
SPECIALLY DESIGNED FOR HIGH RELIABILITY AND LOW VIBRATION
	* Designed by FEM (Finite Element Method) stress calculation. * Stress measurement confirmation by component element tests. * NCI (Nodular Cast Iron) highly rigid monoblock double-walled hanger type crank case. * Special chrome-molybdenum steel forged induction hardened crankshaft with large main and    crankpin journals; carefully counterweighted for high degree of balance.    Very low vibration levels.
SIMPLIFIED MAINTENANCE AND INSPECTION
	* Four stud cylinder head fastening. * Wide air trunk and cooling water and lube oil pipes built-in with crankcase. * Special hydraulic tools for disassembly and assembly work. * Swing arm type cam followers. * Unitized per cylinder segmented cam shaft. * Total weight reduced by 12%, component parts reduced by 25%.

　

MODEL	6L22HLX	8L22HLX	12V22HLX	16V22HLX	18V22HLX
Type	Turbo charged, 4 cycle diesel engine with air cooler
Configuration	In-line-form		Vee-form
Cylinders	6	8	12	16	18
Bore	220 mm
Stroke	300 mm
Displancement	11.40 L/cyl.
Rotation direction	Clockwise (Viewing from the coupling side)
Starting system	By compressed air
Fuel injection system	Direct injection
Cooling method	Water cooled
Turning method	Hand drive
Fuel oil	Diesel oil or Heavy fuel oil

　

MODEL	6L22HLX	8L22HLX	12V22HLX	16V22HLX	18V22HLX
Frequency	50/60 Hz
Max . combustion pressure	20 MPa (204 kgf/cm2)
Mean effective pressure	2.44 MPa (24.91 kgf/cm2)

　

Engine output for 50 Hz	1 392 kWm	1 856 kWm	2 784 kWm	3 712 kWm	4 176 kWm
	(232 kWm/cyl.)
Generator output	1 320 kWe	1 760 kWe	2 640 kWe	3 530 kWe	3 970 kWe
Engine speed	1 000 min-1 (1 000 rpm)
Mean piston speed	10.0 m/sec

　

Engine output for 60 Hz	1 253 kWm	1 670 kWm	2 506 kWm	3 341 kWm	3 758 kWm
	(209 kWm/cyl.)
Generator output	1 180 kWe	1 580 kWe	2 380 kWe	3 170 kWe	3 570 kWe
Engine speed	900 min-1 (900 rpm)
Mean piston speed	9.0 m/sec

>>	The output figures shown in the tables represent the rating under the following standard reference conditions. If site conditions are different from the standard reference conditions, the output shall be adjusted from the above figures. Standard Reference Conditions :
		1) Ambient temperature: 40 degC 2) Cooling water (air cooler inlet) temperature: 35 degC 3) Atmospheric pressure: 101.3 kPa (760 mm Hg) 4) Generator output is subject to generator efficiency

　

　

MODEL	Principal Dimensions (mm)					Mass (t)
	A	B	C	D	E	Engine	Generator
6L22HLX	3 390	2 730	6 120	2 730	1 693	12	6.5
8L22HLX	4 130	3 100	7 230	2 847	1 693	15	11.0
12V22HLX	3 680	3 250	6 930	3 192	2 080	20	12.5
16V22HLX	4 480	3 490	7 970	3 192	2 080	24	15.0
18V22HLX	4 880	3 590	8 470	3 192	2 080	27	16.5

1 Crank Case 　A monoblock hanger type structure made of NCI (Nodular Cast Iron) for sufficient strength and rigidity, with low vibration characteristics necessary for the high Pmax of the engine. In a simplified design, the crank case incorporates the wide intake air duct, the cooling water main pipe, and lubricating oil main pipe.
	2 Crankshaft & Main Bearings 　 　Forged from special chrome-molybdenum steel stock, the crank shaft is capable of sufficient strength to withstand the high Pmax of the engine, made effective by the large diameter of the main and crankpin journals with induction hardening. Kelmet type metal bearings resist increased surface pressure, prolonging service life. Carefully designed counterweights ensure a high degree of balance, maintaining sufficient and consistent bearing oil film thickness.
3 Pistons 　From Niigata's own foundry, the piston is a simple, monoblock construction of Nodular Cast Iron, lightweight but efficient for high Pmax capacity. Fitted in each piston are three compression rigs (with a special barrel type top ring) and one oil ring, which, when functioning together with the fire ring in the cylinder liner, reduces lubricating oil consmption.
	4 Connecting Rods 　 　Of special forged steel, the connecting rod consists of a horizontal-split large end bearing housing to match the large diameter crankpin for improved reliability and reduced bearing load stress.
5 Cylinder Liners 　Fabricated with special wear resistant cast iron, the cylinder liner is equipped with a replaceable fire ring at the top portion combustion zone. The upper section of the liner embodies a thick wall construction, for high Pmax operation. The lower section of the liner is air-cooled to effectively reduce cold corrosion wear.
	6 Cam Shaft 　 　The cam shaft is a monoblock structure composed of the cam and a large diameter shaft, considering the high injection pressure needed for increased combustion efficiency. The cam shaft's segment type construction (one segment is one cylinder) assures very easy, simplified maintenance. Each segment is bolted axially to that of the next cylinder's through a common journal part.
7 Cylinder Heads 　Made of CV (compacted vermicular) cast iron for even stress distribution and better thermal conductivity, the cylinder heads are of carefully designed rib arrangement for uniform rigidity and low deformation under load. Cooling water from the liner ascends into the cylinder heads via circumferential cooling bores for the thick walled combustion zones before exting to the headers. The 4-stud design is further adopted for wider intake and exhaust ports and simplified maintenance. Two intake and two exhaust valves are arranged in tandem for each head, with both intake and exhaust ports located at one side opposite the camshaft side, simplifying maintenance work.
	8 Exhaust Valves 　 　Nimonic (special high corrosion resistance alloy) valves have mechanical rotomat rotators to equally distribute heat and ensure uniform contact for long reliable operation.
9 Fuel Injection Pumps & Fuel Injectors 　A high pressure fuel injection pump (monoblock, closed barrel type), a mini-mass injector, and a short cycle injection pipe that goes through the cylinder head all contribute to higher combustion efficiency and better fuel economy. The injection nozzle spray holes are specially treated to increase the discharge coefficient, thus improving combustion and prolonging nozzle tip service life.