Name: Monarch Oil nozzle 1.25GPH / 45R
Brand: Monarch
SKU: 1.25GPH / 45R

Flow rate

1.25 GPH

Spray angle

45 °

Spray pattern

Description

This is an oil nozzle with a flow rate of 1.25 GPH, a 45 ° spray angle and an R spray pattern. It is used to atomise fuel oil in a burner, forming the spray that is mixed with air for combustion. The 1.25 GPH figure defines the volume of oil passed per hour at the rated nozzle pressure. The 45 ° angle sets the width of the spray cone, and the R pattern defines the shape of the spray. It is a replacement part for oil-fired burners and boilers that take this nozzle size.

Nozzle selection chart

Flow rate	kg/h	45°	60°	80°
0.40	1.27	R		R
0.45	1.43	R
0.50	1.59	R	R
0.55	1.75	R
0.60	1.91	R
0.65	2.07	R		R
0.75	2.38	R	R
0.85	2.70	R	R
1.00	3.18	R	R	R
1.10	3.50	R
1.20	3.82	R
1.25	3.97	R	R	R
1.35	4.29	R	R
1.50	4.77	R	R	R
1.65	5.25	R	R
1.75	5.56	R
2.00	6.36	R	HO R	PLP R
2.25	7.15	PLP R	PLP R	R
2.50	7.95	PLP R	HO PLP R
3.00	9.54	PLP R	HO PLP R
3.50	11.13	HO PLP R	HO R
4.00	12.72	PLP	BPS PLP
4.50	14.31	PLP	BPS HO PLP	PLP
5.00	15.90	HO PLP	BPS PLP
5.50	17.49	PLP	BPS HO
6.00	19.08	PLP	BPS PLP
6.50	20.67	PLP	BPS PLP
7.00	22.26	PLP	BPS HO PLP
7.50	23.85	PLP	BPS HO
8.00	25.44	PLP	BPS PLP
8.50	27.02	HO PLP	PLP
9.00	28.61	HO PLP	BPS HO	PLP
9.50	30.20	HO PLP	BPS PLP
10.00	31.79		PLP
10.50	33.38	HO PLP	PLP	PLP
12.00	38.15	HO PLP	HO PLP
13.00	41.33	PLP	PLP
13.50	42.92	HO PLP
14.00	44.51	PLP	PLP
15.00	47.69	PLP	HO PLP
15.50	49.28	PLP	PLP
16.00	50.87	PLP
17.00	54.05	PLP	PLP
17.50	55.64	HO
18.00	57.23		PLP
19.50	62.00	HO PLP	PLP
20.00	63.59		PLP
21.50	68.36	PLP	PLP
24.00	76.31	PLP
28.00	89.02	HO PLP
30.00	95.38	HO		PLP
40.00	127.18		PLP	PLP
45.00	143.07			PLP
50.00	158.97			PLP
55.00	174.87		PLP
60.00	190.76			PLP
70.00	222.56			PLP
80.00	254.35			PLP
90.00	286.15			PLP
100.00	317.94			PLP

Choosing and fitting

Nozzles of this type are selected by matching the flow rate, spray angle and spray pattern to the burner manufacturer's specification, and by matching the thread and body form to the nozzle holder. Mounting forms differ by thread size and by the length and shape of the body, so the old nozzle must be compared with the replacement before ordering. The nozzle seat and the holder must be clean and undamaged, and the nozzle must be tightened to the torque given by the burner maker. The pump pressure and the filtration upstream of the nozzle must also be checked, since they affect the flow actually delivered.

Signs of failure

Nozzles of this type commonly fail by clogging of the internal passages or of the strainer, by wear of the orifice, or by a distorted spray pattern. The equipment then shows a poor flame, delayed ignition, pulsation, soot deposits or a rise in flue gas readings, and in some cases the burner locks out. Checking the spray pattern, the flow rate and the condition of the strainer, together with the pump pressure, shows whether the nozzle is the cause.