Boiler Ratings & Pump Capacity | Pump Alignment

 

BOILER RATINGS & PUMP CAPACITY REQUIRED


Equivalent
Boiler HP
BTU/hr.
1000's
Steam
Lb/per hr.
EDR
Rating
Sq. Ft.
Cond. Rate
GPM
Pump Cap.
Req.. GPM
20
670
690
2790
1.38
3.0
30
1005
1035
4185
2.07
6.0
40
1340
1380
5580
2.76
9.0
50
1675
1725
6975
3.45
9.0
60
2010
2070
8370
4.14
12.0
70
2345
2415
9765
4.83
15.0
80
2680
2760
11160
5.52
15.0
100
3350
3450
13950
6.90
22.5
125
4185
4313
17438
8.62
22.5
150
5025
5175
20935
10.40
30.0
200
6695
6900
27915
13.80
45.0
250
8370
8625
34895
17.30
45.0
300
10045
10350
41875
20.70
60.0
350
11720
12075
48825
24.20
75.0
400
13390
13800
55830
27.60
75.0
450
15064
15520
63000
31.10
97.5
500
16740
17250
69790
34.50
97.5
660
18411
18975
77000
37.95
120.0
600
20085
20700
83750
41.40
120.0
650
21759
22425
91000
44.85
150.0
700
23432
24150
98000
48.30
150.0
750
25106
25875
105000
51.75
150.0
800
26780
27600
112000
55.20
187.5
1000
33475
34500
140000
69.00
200.0

Note: Boiler HP x .069 GPM ot feed water required to maintain boiler water level at 100% load. Pumps should be selected to provide two to three times the condensate ratio shown in the above Table.
Pump capacity listed in the Table are based on an approximate 3 to 1 ratio.

Sizing Receivers for Boiler Feed Pumps

Receiver capacity is determined by allowing 1 gal of gross capacity per boiler HP.
Maximum working capacity recommended is 75% of gross capacity.
General Service Administration specs.
 

Useful Conversion Data

1 Boiler HP = 34.5 Ibs. of water evaporated per hour from and at 212°F
1 Boiler HP = 33,475 BTUH or 970 BTUH per lb. of water.
1 Boiler HP = 140 Sq. Ft. EDR.
1 BTU is required to raise 1 lb. of water 1°F between 32°F and 212° F


 

ALIGNMENT PROCEDURE

Pump and motor on baseplate -- Motor to be aligned

It is assured that the baseplate has been set and grouted with pump fixed and with pump shaft level and pipe flanges properly positioned. Any pipe strain must be relieved. Final alignment should be made by shimming the driver (motor) only.

1. Remove Soft Foot of Motor

A. With all bolts loose, check with a feeler gage to see if shims must be added at any motor feet.

B. With necessary shims added, pull down bolts in all motor feet.

C. Loosen one bolt at a time and retighten, noting if any change is made in a dial indicator with button placed against motor shaft (usually a horizontal reading is best). Repeat this at all bolts. If loosening a bolt shows a change, add some shims at this point until an acceptable reading is obtained. Normally, .005" deflection is OK, but the less deflection will simplify the remaining work.

2. Give Motor Angular Alignment in Vertical Plane

A. Take a T.I.R. (Total Indicator Reading) top to bottom

Note: If motor is too low, (more than 1/8") complete step 3A only and then return to 2A.

 

B. Shim motor at front or back

"S" = Mils (T.I.R. x 2F)
2R

Where "S"= Shim total

"F"= Motor "F" dimension

Note: Maximum angular allowance is .004"

3. Raise or Lower Motor to Parallel Alignment in Vertical Plane

A. Add shims equally under all motor feet to approximately .050" reading with a straight edge.

B. Read T.I.R. (top to bottom) and add shims to all feet

"S"= T.I.R./2

Note: Maximum allowable parallel alignment is.004" T.I.R.

4. Shift Motor to Change Angular Alignment in Horizontal Plane


A. Take T.I.R. reading (side to side)
B. Loosen bolts, keep one bolt snug
C. Rotate motor around "snug bolt" until you have 1/2 original T.I.R. read in part "A" above
D. Tighten all bolts and check T.I.R. . Repeat A, B & C if necessary until tolerance is obtained.


5. Shift Motor Parallel Alignment in Horizontal Plane


A. Take T.I.R. (side to side) Loosen all bolts
B. Shift motor parallel 1/2 T.I.R.
C. Tighten bolts, check T.I.R. and repeat A & B if necessary until tolerance is obtained.