Product Overview

The Spirax Sarco MFP14 automatic pump is a displacement receiver operated by steam or compressed air. It is generally used to lift liquids such as condensate to a higher level. Subject to suitable operating conditions, the pump can also directly drain closed vessels under vacuum or pressure. When used with a float steam trap, it can effectively drain temperature-controlled heat exchangers under all operating conditions.

Available body materials:

Body Material	Variant
SG iron	MFP14
Cast steel	MFP14S
Stainless steel	MFP14SS

This product complies with the European Pressure Equipment Directive 2014/68/EU and ATEX Directive 2014/34/EU, and is available with EN 10204 3.1 certification when specified.

Sizes and Connections

MFP14 SG iron

• 1", 1 1/2", 2", and 3" x 2" screwed BSP T Rp (ISO 7-1)
• DN25, DN40, DN50, and DN80 x DN50 flanged EN 1092 PN16, ANSI B16.5 Class 150, and JIS/KS B2238 10

MFP14S cast steel

• DN50 flanged EN 1092 PN16, ANSI B16.5 Class 150, and JIS/KS B2238 10
• 2" screwed BSP T Rp (ISO 7-1) / NPT connections are available to special order

MFP14SS stainless steel

• DN50 flanged EN 1092 PN16, ANSI B16.5 Class 150, and JIS/KS B2238 10
• 2" screwed BSP T Rp (ISO 7-1) / NPT connections are available to special order

Optional Extras

Electronic Pump Monitors

A plugged boss is provided on the pump cover, screwed 1/2" BSP T Rp (ISO 7-1), for connecting an electronic pump monitor. For full details see TI-P136-24.

• EPM1: Stand-alone unit with 8-digit LCD display powered by an integral 1.5 V lithium battery
• EPM2: Version suitable for coupling to a remote counter or building energy management system (BEMS)

Insulation Jacket

An insulation jacket tailor-made for each size of MFP14 is available for energy saving and health and safety improvement. See TI-P136-07.

Materials and Construction

Main Materials

No.	Part	Variant / Detail	Material / Grade
1	Cover	MFP14	SG iron, (EN JS 1025) EN-GJS-400-18-LT
1	Cover	MFP14S	Cast steel, DIN GSC 25N / ASTM A216 WCB
1	Cover	MFP14SS	Stainless steel, BS EN 10213-4 144091 / ASTM A351 CF3M
2	Cover gasket		Synthetic fibre
3	Cover screws		Stainless steel, ISO 3506 Gr. A2-70
4	Body	MFP14	SG iron, (EN JS 1025) EN-GJS-400-18-LT
4	Body	MFP14S	Cast steel, DIN GSC 25N / ASTM A216 WCB
4	Body	MFP14SS	Stainless steel, BS EN 10213-4 144091 / ASTM A351 CF3M
5	Pillar		Stainless steel, BS 970 431 S29
6	Connector rod		Stainless steel, BS 1449 304 S11
7	Float and lever		Stainless steel, AISI 304
8	Eyebolt (integral)	MFP14	SG iron, (EN JS 1025) EN-GJS-400-18-LT
8	Eyebolt (integral)	MFP14S	Cast steel, DIN GSC 25N / ASTM A216 WCB
8	Eyebolt (integral)	MFP14SS	Stainless steel, BS EN 10213-4 144091
9	Mechanism lever		ASTM A351 CF3M / BS 3146 Pt.2 ANC 2
10	Spring	DN50 and DN80	Inconel 718, ASTM 5962 / ASTM B367
11	Pressure plug	DN40	Stainless steel
11	Pressure plug	Other sizes	Steel, DIN 267 Part 1 Class 5.8
12	Check valves		Stainless steel
13	Screwed boss flanges		Steel
14	Mechanism bracket		Stainless steel, BS 3146 Pt.2 ANC 4B
15	Bracket screws		Stainless steel, BS 6105 Gr. A2-70
16	Inlet valve seat		Stainless steel, BS 970 431 S29
17	Inlet valve stem		Stainless steel, ASTM A276 440B
18	Inlet valve seat gasket		Stainless steel, BS 1449 409 S19
19	Exhaust valve seat		Stainless steel, BS 970 431 S29
20	Exhaust valve		Stainless steel, BS 3146 Pt.2 ANC 2
21	Exhaust valve seat gasket		Stainless steel, BS 1449 409 S19
22	EPM actuator		ALNICO
23	O-ring seal		EPDM
28	Spring anchor		Stainless steel, BS 970 431 S29

Pressure and Temperature Limits

The product must not be used in the shaded region. A-D applies to flanged PN16, B-D to flanged JIS/KS 10, and C-D to flanged ANSI 150. The product is safe for use under full vacuum conditions.

Body Design Conditions

Condition	MFP14	MFP14S	MFP14SS
Maximum motive inlet pressure (steam, air, or gas)	13.8 bar g	13.8 bar g	10.96 bar g
PMA Maximum allowable pressure	16 bar g at 120 C	16 bar g at 120 C	16 bar g at 93 C
TMA Maximum allowable temperature	300 C at 12.8 bar g	300 C at 10.8 bar g	300 C at 9.3 bar g
Minimum allowable temperature	0 C	0 C	0 C
PMO Maximum operating pressure for saturated steam service	13.8 bar g at 198 C	13.8 bar g at 198 C	10.96 bar g at 188 C
TMO Maximum operating temperature for saturated steam service	198 C at 13.8 bar g	198 C at 13.8 bar g	188 C at 10.96 bar g

Total lift or backpressure, meaning static head plus pressure in the return system, must be below the motive fluid inlet pressure to allow capacity to be achieved. Calculate it as: Height (H) in metres x 0.0981 + return line pressure (bar g) + downstream piping friction pressure drop (bar), with friction calculated at the lesser of six times actual condensate rate or 30,000 litres/h.

Recommended filling head above the pump: 0.30 m
Minimum filling head required: 0.15 m with reduced capacity
Standard pump operates with liquids of specific gravity: 1 down to 0.8

Pump Discharge Per Cycle and Consumption

Data	DN80 x DN50	DN50	DN40 and DN25
Pump discharge per cycle	19.3 litres	12.8 litres	7 litres
Steam consumption	20 kg/h maximum	20 kg/h maximum	16 kg/h maximum
Air consumption (free air)	5.6 dm3/s maximum	5.6 dm3/s maximum	4.4 dm3/s maximum
Temperature limits (ambient)	-10 C to 200 C	-10 C to 200 C	-10 C to 200 C

Dimensions and Weights

Size	A JIS/KS PN	ANSI	B	C	D*	E	F	G	H	J	K	L	Pump only kg	Including check valves and flanges kg
DN25	410	-	305	507.0	-	68	68	480	13	18	165	Ø280	51	58
DN40	440	-	305	527.0	-	81	81	480	13	18	165	Ø280	54	63
DN50	557	625	420	637.5	-	104	104	580	33	18	245	Ø321	72	82
DN80 x DN50	573	645	420	637.5	430	119	104	580	33	18	245	342	88	98

* Dimension D only applies to the DN80 x DN50 pump which has an oval body. The DN25, DN40, and DN50 are round bodied, therefore dimension L is sufficient.

Motive inlet: 1/2" BSP T Rp (ISO 7-1) or NPT steam, compressed air, or gas inlet
Exhaust: 1" BSP T Rp (ISO 7-1) / NPT exhaust

Sizing and Selection

Considering inlet pressure, backpressure, and filling head conditions, select the pump size which meets the capacity requirements of the application.

Known Data for Example

• Condensate load: 1500 kg/h
• Steam pressure available for operating pump: 5.2 bar g
• Vertical lift from pump to the return piping: 9.2 m
• Pressure in the return piping: 1.7 bar g
• Filling head on the pump available: 0.15 m

It is strongly recommended that the maximum motive/backpressure differential is between 2 and 4 bar g.

Selection Example

First calculate the total effective lift against which condensate must be pumped:

• Vertical lift = 9.2 m
• Return main pressure = 1.7 bar g
• Pressure head equivalent = 1.7 / 0.0981 = 17.3 m
• Total effective lift = 9.2 + 17.3 = 26.5 m

Now plot the known data on the graph:

1. Plot a horizontal line from 5.2 bar g motive pressure.
2. Plot a line indicating 26.5 m lift.
3. From the intersection, drop a vertical line to the X axis.
4. Read the corresponding capacity: 2400 kg/h.

Because the filling head is 0.15 m rather than 0.30 m, the capacity must be corrected by the appropriate multiplying factor.

Capacity Multiplying Factors for Other Filling Heads

Filling head m	DN25	DN40	DN50	DN80 x DN50
0.15	0.90	0.75	0.75	0.80
0.30	1.00	1.00	1.00	1.00
0.60	1.15	1.10	1.20	1.05
0.90	1.35	1.25	1.30	1.15

Final pump selection in this example is DN50. The corrected capacity is 0.75 x 2400 = 1800 kg/h, which comfortably handles a condensate load of 1500 kg/h.

Capacity Multiplying Factors for Motive Gas Supplies Other Than Steam

Pump size	10%	20%	30%	40%	50%	60%	70%	80%	90%
DN25	1.20	1.25	1.30	1.35	1.40	1.43	1.46	1.50	1.53
DN40	1.20	1.25	1.30	1.35	1.40	1.43	1.46	1.50	1.53
DN50	1.02	1.05	1.08	1.10	1.15	1.20	1.27	1.33	1.40
DN80 x DN50	1.02	1.05	1.08	1.10	1.15	1.20	1.27	1.33	1.40

If you are in doubt about pump size or operating conditions are unusual, Spirax Sarco recommends providing the following data:

1. Nature of liquid to be pumped.
2. Temperature of liquid to be pumped.
3. Quantity to be pumped in kg/h or litres/h.
4. Initial lift, horizontal distance, and net effective lift.
5. Operating medium: steam, compressed air, or gas.
6. Operating pressure available.
7. Whether the unit drains from a vented receiver, or from equipment under steam pressure or vacuum.

Safety Information, Installation, and Maintenance

For full details see Installation and Maintenance Instructions IM-P136-03 supplied with the product.

• For best operation, any flash steam must be vented or condensed ahead of the pump inlet.
• Steam is the recommended motive fluid for steam systems.

To achieve rated capacity, the pump must be installed with check valves as supplied by Spirax Sarco. Use of substitute check valves may affect performance.

How to Specify and Order

Automatic pumps shall be Spirax Sarco type MFP14 with SG iron bodies and flanged or screwed connections. They shall have stainless steel valve and float assemblies, and a stainless steel disc check valve on the condensate inlet and outlet connections. They shall have screwed steam/compressed air inlet and exhaust connections.

Ordering example: 1 off Spirax Sarco DN50 MFP14 automatic pump having flanged EN 1092 PN16 connections with BSP T Rp (ISO 7-1) motive fluid connections, complete with check valves and 2" BSP screwed boss flanges.

Spare Parts

No spare parts are available other than those listed below.

Available spare	Part number reference
Cover gasket	2
Float	7
Inlet / outlet check valve (each)	12
Cover and internal mechanism assembly	1, 2, 7 complete
Valve set, inlet and exhaust valves and seats	16, 17, 18, 19, 20, 21
Spring shaft kit, two spring assemblies including anchors and two shafts plus nuts and washers for rear shaft	10

Always order spares using the description given above and state the pump model and size.