Mather and Platt High Head Multi-Stage Pumps - PL & PJ Ranges

Performance Charts

General Features: 

The PL/PJ range of multi-stage centrifugal pumps is designed for a wide range of high head duties at sustained highest efficiency.

The range was developed against a background of many years of pratical experience and research; these pumps being particularly suitable for high lift mine drainage duties, main line water supply applications with formidable total heads to overcome, high pressure boiler feed pumps operating at elevated temperatures and for other general  installations requiring substantial generated heads, allied to the  well proven reliability and other special features of a heavy duty ring section design.

The selection charts below show the high generated heads achieved, with the stable characteristics offered by the PL/PJ range, at the standard direct coupled motor speeds of 1480r/min and 2960r/min obtained from a 50 Hz electrical supply. The pumps are also suitable for operation at other speeds, including those applying when direct coupled to 2 to 4 pole motors fed from a 60 Hz electrical supply.

The design further allows for direct drive from power recovery water turbines of the Pelton wheel type, and for direct or indirect drive from virtually all other forms of prime mover.

These pumps are of particular robust construction and embody the latest hydraulic design principles. The materials of construction are selected to ensure compatibility of rotating and stationary wearing parts combined with high corrosion and erosion resistance for prolonged life, sustained efficiency, reliability in service, and low maintenance cost.

Construction

 The second view of the typical PL/PJ pump shows the compact design of the unit. The pump is built up from a number of stages and the bodies are held together by the main body bolts tying together the suction and delivery end covers which incorporate the main branches.

Each middle body is provided with feet so that the pump can be assembled in the horizontal position. This is advantageous especially underground where the space and working areas are limited. Horizontal assembly is further assisted by clamping bolts fitted between individual bodies to ensure the unit remain tight during the assembly work.

The bearing brackets and bearing bushes are designed with a horizontal split along the centre line. This gives the advantage of being able to strip the bearing assembly without disturbing the alignment of the element, and without having to remove the pump, half coupling or the driving unit. The bearing brackets are supported at the top and bottom, thereby avoiding distortion of bearing bush / shaft alignment when the pump is under pressure.

The balance valve cover is not disturbed when the F.E. bearing assembly is removed, thus avoiding the need to remove the gland packing and drain the complete pump.

The body bolts are located in clearance holes drilled through the end covers and are fitted with nuts at each end. This avoids deterioration of threaded holes in the covers to receive the bolts. Bolts are spaced to avoid the pump branches and do not interfere with the water passageways.

The balance valve assembly is designed to enable the wearing parts to be replaced at minor cost; therefore the stainless steel balance valve head will never have to be replaced, as it is provided with a seperate wear face. The balance valve seat and bush are two seperate items which can avoid the need to replace boths items at the same time. The impellars are retained on the shaft by an impellar lock-nut which is not disturbed during maintenance work on the balance valve assembly. This prevents interstage leakage along the shaft developing due to separation of impellar hubs during such balance valve maintenance.

Material Specifications (Standard Pump)

End Covers : Cast Steel
Middle Bodies : Cast Steel
Shaft : Steel
Impellars : Phosphor Bronze
Diffusers : Phosphor Bronze
Return Channels : Cast Iron
Balance Valve Head : Stainless Steel
B.V. Face : Phosphor Bronze
B.V. Stalk : Phosphor Bronze
B.V. Seat : Bearing Bronze
B.V. Bush : Bearing Bronze
Neck Rings / Bushes : Bearing Bronze
Glands : Gun Metal
Sleeve Bearing: : Bearing Bronze, White Metal Lined

Alternate Specifications

The pumps can also be offered with a wide range of alternative materials to suit special operating conditions and customer's preference.

The running surfaces between the impellar necks and neck rings, impellar hubs and neck bushes, balance valve stalk and balance valve bush can be ceramic to reduce the wear and coated to reduce the wear and increase the life of these components.

The maximum permissable total axial wear on the balance valve face / seat is 3 to 4 mm and the life of these components can be increased by stellite coating the running surfaces of the balance valve face and the balance valve seat.

Upone request the conventional wear limit indicator can be replaced on the larger units by an electrically operated wear limit warning switch with provision for visual observation.

For the more specialised applications, e.g. Boiler Feed Duties, features such as water cooled stuffing boxes can be incorporated in the design.

Specifications: 

PL / PJ RANGE: Limitations on test pressure in kPa
PUMP SIZE BS 1452-1977
GRADE 220
CAST IRON
BS 3100-1976
GRADE A2
CARBON STEEL
BS 3100-1976
GRADE 316 C16
STAINLESS STEEL
PL 80 4600 13000 8600
PL 100 6200 22000 161100
PL 150 6200 23000 16100
PL 200 6200 25900 18100
PJ 80 6200 9050 9050
PJ 100 4600 10000 10000
PJ 150 6200 13600 13400
PJ 200 6200 19400 14300
PJ 250 6200 20700 15300
It is recommended that the hydrostatic test pressure shall not be less than the greater of the following:
a) 150 Percent of pump rated pressure
b) 125 Percent of closed valve pressure

Specifications

Scroll table left and right for small devices:

PL/PJ PUMP DETAILS: (Dimension in millimetres) SHAFT & KEYWAY DETAILS SUCTION FLANGE DETAILS DELIVERY FLANGE DETAILS
MODEL  A B C D E F G H I J K L M N O P Q R S A1 B1 C1 D1 E1 T U V W X No of Holes BS4504 T1 U1 V1 W1 X1 No of Holes
PL 80 75 578 638 370 349 377 24 30 48 48 29 51 32 28 200 300 540 240 22 110 80 44,537
44,526
38,5
38,3
16,000
15,957
80 180 230 36 26 8 160/1 80 180 230 36 26 8
PL 100 90 688 788 465 438 488 24 40 78 78 40 60 50 50 260 400 710 310 30 140 110 63,545
63,532
56,80
56,00
20,00
19,95
100 235 300 54 33 8 250/1 100 235 300 54 33 8
PL 150 105 799 871 547 511 549 24 88 84 84 35 65 34 38 308 458 811 353 35 140 110 69,800
69,750
61,00
60,80
22,00
21,95
150 320 390 68 36 12 250/1 150 320 390 68 36 12
PL 200 117 890 988 665 655 704 26 95 125 125 60 60 49 49 351 570 990 420 35 210 160 103,00
102,99
94,00
93,80
25,00
24,95
200 400 485 82 42 12 250/1 200 400 485 82 42 12
                                                                           
PJ 80 89 670,5 736,5 450 452 482 24 32 48 48 47 46 36 30 230 340 630 290 25 140 110 64,045
64,032
56,6
56,4
20,000
19,948
80 170 215 28 22 8 64/1 80 170 215 28 22 8
PJ 100 106 810 859 532 503 521 24 52 68 68 39 61 31 18 300 430 780 350 25 140 110 75,045
75,032
67,50
67,30
20,000
19,948
100 210 265 40 30 8 160/1 100 210 265 40 30 8
PJ 150 126 937 1034 612 555 603 35 60 90 90 70 60 49 48 325 520 925 405 30 170 140 85,052
85,037
76,0
75,8
25,000
24,948
150 290 355 44 33 12 100/1 150 290 355 44 33 12
PJ 200 142 1115 1275 661 635 712,5 35 80 100 100 75 75 82,5 77,5 396 564 1045 481 40 210 160 110,035
110,013
100,0
99,8
28,000
27,948
200 360 430 52 36 12 100/1 200 360 430 52 36 12
PJ 250 AS-AN 155 1191 1341 747 737 805 35 80 120 110 85 85 82 68 445 700 1240 540 45 290 240 145,061
145,043
132,00
131,70
40,000
39,938
250 430 515 68 42 12 160/1 250 430 515 68 42 12
PJ 250 BS 164 1265 1455 821 736 844 35 80 120 140 85 85 82 108 445 700 1240 540 45 290 240 140,061
140,043
127,00
126,70
40,000
39,938
300 500 585 78 42 16 160/1 250 430 515 68 42 12