Modular Designed Metering Pump | Milroyal C

The MILROYAL C metering pump is a robust industrial duty metering pump for use in critical processes in oil and gas, chemical and hydrocarbon processes, water and waste treatment, and in most industries where chemical injection is required.

Material (liquid end): 316SS / Alloy 20 / Alloy C22 / PVC*
Pressure max: 1,600 psi / 110 bar (metallic liquid end); 150 psi / 10 bar (plastic liquid end); 10,000 psi / 690 bar (packed plunger)
Flow max: 968 gph / 3,664 lph (metallic liquid end); 353 gph / 1,336 lph (plastic liquid end); 1,225 gph / 4,637 lph (packed plunger)
Multiplex: Available
Flow variation control: Manual / Remote
Certifications: API 675, EC, ATEX, IECEX

*PVC liquid ends are not available with packed plunger type

This product is not available in India.

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Pressure Max - Metallic Liquid End

110

Bar

Pressure Max - Metallic Liquid End PSI

10000

PSI

Pressure Max - Plastic Liquid End

Bar

Pressure Max - Plastic Liquid End GPH

150

GPH

Flow Max - Metallic Liquid End

3664

LPH

Flow Max - Metallic Liquid End PSI

1225

PSI

Flow Max - Plastic Liquid End

1336

LPH

Flow Max - Plastic Liquid End GPH

353

GPH

Modular Design Flexibility

Advanced modular construction supports a wide variety of liquid ends and options, enabling precise customization for specific process requirements.

Adaptable Process Performance

Efficiently handles diverse fluids, pressures, and flow rates, making it suitable for a broad range of demanding industrial applications.

Multiplex System Capability

Multiplex configurations allow multiple pumps to operate together, increasing performance, reliability, and operational flexibility.

Oil & Gas Durability

Designed for harsh offshore environments, delivering consistent injection of methanol, inhibitors, and other corrosive chemicals in extreme conditions.

Pipeline Efficiency (DRA)

Field-proven for drag reducer agent injection, optimizing pipeline flow by reducing turbulence at key network points.

Chemical & Water Processing

Ensures accurate dosing of harsh chemicals in petrochemical and water treatment processes, supporting compliance and long-term cost efficiency.

HIGH PERFORMANCE DIAPHRAGM (HPD) LIQUID END PERFORMANCE

Typical performance based on 1725 RPM, 3 Phase, 60 Hz motor. Derate flow rates for all other RPM speeds.

Plunger Diameter	Gear Ratio Code	SPM @1725 RPM	Maximum Capacity*		1 HP (0.75 kW)		1 1/2 HP (1.1 kW)		2 HP (1.5 kW)		3 HP (2.2 kW)		5 HP (4 kW)
			Maximum Capacity*		Maximum Discharge Pressure*
			GPH	L/H	PSIG	BAR	PSIG	BAR	PSIG	BAR	PSIG	BAR	PSIG	BAR
3/4 in (19 mm)	8K	43	13	49	1600	110	1600	110	-	-	-	-	-	-
	8J	71	21.5	81	1600	110	1600	110	1600	110	-	-	-	-
	8H	85	25.7	97	1400	97	1600	110	1600	110	1600	110	-	-
	8G	113	34.0	129	1000	7	1550	107	1600	110	1600	110	-	110
	8F	140	42.0	159	825	57	1250	86	1600	110	1600	110	1600	110
7/8 in (22 mm)	8K	43	17.5	66	2000	138	2900	200	3025	209	-	-	-	-
	8J	71	29.0	110	1200	83	1800	124	2400	165	3025	209	-	-
	8H	85	35.0	132	1000	69	1500	103	2000	138	3025	209	-	-
	8G	113	46.0	174	750	52	1150	79	1500	103	2300	159	3025	209
	8F	140	57.0	216	600	41	900	62	1250	86	1850	128	3025	209
1 in (25 mm)	8K	43	23	87	745	51	1545	107	2235	154	3025	209	-	-
	8J	71	38	143	465	32	1000	69	1550	107	2635	182	3025	209
	8H	85	46	174	315	22	770	53	1240	85	2150	148	3025	209
	8G	113	61	230	240	17	580	40	935	64	1620	112	2900	200
	8F	140	76	287	165	11	510	35	855	59	1520	105	2800	193
1 1⁄4 in (32 mm)	8K	43	37	140	480	33	950	66	1420	98	2060	142	-	-
	8J	71	60	227	295	20	640	44	1000	69	1680	116	1930	133
	8H	85	72	272	200	14	490	34	790	54	1370	94	1930	133
	8G	113	97	367	150	10	370	26	590	41	1030	71	1900	131
	8F	140	120	454	110	8	325	22	545	38	970	67	1840	127
1 ½ in (38 mm)	8K	43	53	200	335	23	660	46	990	68	1350	93	-	-
	8J	71	88	333	205	14	445	31	695	48	1170	81	1350	93
	8H	85	105	397	140	10	345	24	550	38	950	66	1350	93
	8G	113	140	529	105	7	260	18	415	29	720	50	1300	90
	8F	140	173	654	75	5	230	16	380	26	675	47	1280	88
2 in (51 mm)	8K	43	97	367	190	13	370	26	560	39	745	51	-	-
	8J	71	151	571	115	8	250	17	390	27	660	46	745	51
	8H	85	181	685	80	6	190	13	310	21	540	37	745	51
	8G	113	240	908	60	4	145	10	235	16	400	28	745	51
	8F	140	299	1131	40	3	130	9	215	15	380	26	740	51
2 ½ in (64 mm)	8K	43	145	548	120	8	240	17	350	24	500	34	-	-
	8J	71	240	908	70	5	160	11	250	17	420	29	470	32
	8H	85	288	1090	50	3	120	8	200	14	340	23	470	32
	8G	113	383	1449	40	3	90	6	150	10	260	18	380	26
	8F	140	475	1797	-	-	75	5	122	8	211	15	350	24
3 in (76 mm)	8K	43	212	803	120	8	170	12	250	17	350	24	-	-
	8J	71	352	1332	90	6	150	10	200	14	310	21	350	24
	8H	85	423	1601	85	6	130	9	175	12	260	18	350	24
	8G	113	562	2127	60	4	90	6	130	9	190	13	325	22
	8F	140	678	2567	-	-	75	5	105	7	155	11	260	18
3 ½ in (89 mm)	8K	43	297	1124	60	4	120	8	185	13	235	16	-	-
	8J	71	490	1854	-	-	80	6	125	9	220	15	235	16
	8H	85	587	2221	-	-	60	4	100	7	175	12	220	15
	8G	113	780	2952	-	-	-	-	75	5	130	9	175	12
	8F	140	968	3663	-	-	-	-	65	4	100	7	170	12
5 in (127 mm)			573	2168	This application range is now handled by the Primeroyal N frame
			947	3584
			1132	4284
			1500	5677
			1545	5847
5 3⁄4 in (146 mm)			770	2914
			1270	4807
			1520	5753
			2025	7664
			2080	7872

Capacities listed are for discharge pressures up to 200 PSIG (14 Bar).

Capacity will decrease 0.8% for each 100 PSIG (7 Bar) over 200 PSIG (14 Bar).

NOTES:

* Plastic liquid ends are limited to 150 psig (10 Bar) @ 68°F (20°C) and are linearly derated to 65 psi (4 Bar) @ 140°F (60°C).

† Derate capacities 5% when applying a diaphragm rupture detection system.

‡ These gear ratios are limited to 1,450 RPM maximum. SPM and pump capacity noted is based on 1,450 RPM motor.

DISC DIAPHRAGM LIQUID END PERFORMANCE

Typical performance based on 1725 RPM, 3 Phase, 60 Hz motor. Derate flow rates for all other RPM speeds.

Plunger Diameter	Gear Ratio Code	SPM @1725 RPM	Maximum Capacity*		1 HP (0.75 kW)		1 1/2 HP (1.1 kW)		2 HP (1.5 kW)		3 HP (2.2 kW)		5 HP (4 kW)
			Maximum Capacity*		Maximum Discharge Pressure*
			GPH	L/H	PSIG	BAR	PSIG	BAR	PSIG	BAR	PSIG	BAR	PSIG	BAR
5/8 in (16 mm)	8K	43	8.2	31	2710	187	3500	241	-	-	-	-	-	-
	8J	71	13.7	51	1920	132	3500	241	3500	241	-	-	-	-
	8H	85	16.4	62	1210	83	2780	192	3500	241	-	-	-	-
	8G	113	21.8	82	910	63	2090	144	2850	197	3500	241	-	-
	8F	140	27.2	103	725	50	1840	127	2940	203	3500	241	-	-
7/8 in (22 mm)	8K	43	16.8	63	1320	91	2550	176	3500	241	-	-	-	-
	8J	71	27.5	104	850	59	1750	121	2660	183	3500	241	-	-
	8H	85	33.2	125	570	39	1350	93	2110	145	3500	241	-	-
	8G	113	44.2	167	430	30	1010	70	1580	109	2720	188	3500	241
	8F	140	54.5	206	330	23	890	61	1440	99	2540	175	3500	241
1 1⁄8 in (28 mm)	8K	43	28.5	107	775	53	1510	104	2260	156	2400	165	-	-
	8J	71	47	177	490	34	1030	71	1575	109	2360	163	2400	165
	8H	85	56	212	325	22	795	55	1250	86	2150	148	2400	165
	8G	113	74	280	240	17	590	41	940	65	1620	112	2400	165
	8F	140	93	352	180	12	515	36	845	58	1500	103	2400	165
1 ½ in (38 mm)	8K	43	50	189	420	29	845	58	1270	88	1350	93	-	-
	8J	71	84	317	260	18	570	39	885	61	1330	92	1350	93
	8H	85	101	382	160	11	430	30	690	48	1210	83	1350	93
	8G	113	135	511	120	8	325	22	520	36	910	63	1300	90
	8F	140	165	624	85	6	275	19	465	32	840	58	1300	90
2 in (51 mm)	8K	43	90	340	220	15	450	31	725	50	745	51	-	-
	8J	71	150	567	130	9	300	21	475	33	730	50	745	51
	8H	85	179	677	80	6	225	16	370	26	660	46	745	51
	8G	113	238	900	60	4	170	12	280	19	495	34	745	51
	8F	140	295	1116	35	2	140	10	245	17	455	31	745	51
2 ½ in (64 mm)	8K	43	140	529	130	9	280	19	300	21	-	-	-	-
	8J	71	233	881	75	5	180	12	295	20	300	21	-	-
	8H	85	277	1048	40	3	135	9	225	16	300	21	-	-
	8G	113	368	1392	-	-	100	7	170	12	300	21	-	-
3 ½ in (89 mm)	8K	43	280	1059	-	-	130	9	210	14	-	-	-	-
	8J	71	471	1782	-	-	85	6	145	10	210	14	-	-
	8H	85	558	2112	-	-	55	4	105	7	200	14	210	14
	8G	113	742	2808	-	-	40	3	80	6	150	10	160	11

Capacities listed are for discharge pressures up to 1,000 PSIG (69 Bar).

Capacity will decrease 1.0% for each 100 PSIG (7 Bar) over 1,000 PSIG (69 Bar).

HPD LIQUID END DIMENSIONS

Material	Plunger Diameter		A‡		B‡		C*		D
Material	in.	mm	in.	mm	in.	mm	in.	mm	in.
Metal	1	25	5 7⁄32	133	5 7⁄32	133	7 3⁄4	197	½
	1 1⁄4	32	7 1⁄16	179	7 1⁄16	179	9 13⁄16	249	1
	1 ½	38	7 17⁄32	191	7 17⁄32	191	9 13⁄16	249	1
	2	51	7 17⁄32	191	7 17⁄32	191	9 13⁄16	249	1
	2 ½	64	10 1⁄8	257	10 1⁄8	257	12 5⁄16	313	1½
	3 ½	89	10 1⁄8	257	10 1⁄8	257	12 5⁄16	313	1½
	5	127	12 3⁄8	314	12 3⁄8	314	16 7⁄8	429	-
	5 3⁄4	146	12 3⁄8	314	12 3⁄8	314	16 7⁄8	429	-
Plastic	2 ½	64	13	330	13	330	12	305	1½
	3 ½	89	13	330	13	330	12	305	1½
	5	127	18 ½	470	14	356	13 7⁄8	352	2½†
	5 3⁄4	146	18 ½	470	14	356	13 7⁄8	352	2½†

Notes:

* 3 in –150 lb. ANSI raised face flange.

† Suction and discharge connections are horizontal on metal and vertical on plastic, except on plastic 5 in (127 mm) and 5¾ in (146 mm) plungers, where suction is horizontal and discharge is vertical.

‡ A & B dimensions are based on standard ball check configuration: metallic-single ball checks (single poppet on 5 in (127 mm) and 5¾ in (146 mm)); plastic-double ball checks (single on 5 in (127 mm) and 5¾ in (146 mm)).

DISC DIAPHRAGM LIQUID END DIMENSIONS

Material	Plunger Diameter		I		J		K		L
Material	in.	mm	in.	mm	in.	mm	in.	mm	in.
Metal	5⁄8	16	7 1⁄8	181	7 1⁄8	181	5½	140	1 1⁄4
	7⁄8	22	7 1⁄8	181	7 1⁄8	181	5 5⁄8	140	1 1⁄4
	1 1⁄4	28	7 1⁄8	181	7 1⁄8	181	5 5⁄8	143	1 1⁄4
	1½	38	8 1⁄16	205	8 3⁄8	213	5 5⁄8	143	1½
	2	51	10 5⁄8	270	10 5⁄8	270	6 3⁄16	157	2½
	2½	64	10 5⁄8	270	10 5⁄8	270	6 3⁄16	157	2½
	3½	89	11 1⁄16	281	13 1⁄16	332	6½	165	3