<ARTICLE>                     5
<LEGEND>
This schedule contains summary financial information extracted from Swift Energy
Managed Pension Assets Partnership 1989-B, Ltd.'s balance sheet and statement of
operations  contained in its Form 10-Q for the quarter  ended March 31, 1997 and
is qualified in its entirety by reference to such financial statements.
</LEGEND>
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                              DEC-31-1997
<PERIOD-END>                                   MAR-31-1997
<CASH>                                         186,473
<SECURITIES>                                   0
<RECEIVABLES>                                  216,952
<ALLOWANCES>                                   0
<INVENTORY>                                    0
<CURRENT-ASSETS>                               403,425
<PP&E>                                         3,738,883
<DEPRECIATION>                                 (2,277,214)
<TOTAL-ASSETS>                                 1,865,094
<CURRENT-LIABILITIES>                          7,808
<BONDS>                                        0
<PREFERRED-MANDATORY>                          0
<PREFERRED>                                    0
<COMMON>                                       0
<OTHER-SE>                                     1,857,286
<TOTAL-LIABILITY-AND-EQUITY>                   1,865,094
<SALES>                                        175,224
<TOTAL-REVENUES>                               176,516
<CGS>                                          0
<TOTAL-COSTS>                                  57,854<F1>
<OTHER-EXPENSES>                               0
<LOSS-PROVISION>                               0
<INTEREST-EXPENSE>                             0
<INCOME-PRETAX>                                95,238
<INCOME-TAX>                                   0
<INCOME-CONTINUING>                            95,238
<DISCONTINUED>                                 0
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                                   95,238
<EPS-PRIMARY>                                  0
<EPS-DILUTED>                                  0
<FN>
<F1>Includes lease operating expenses, production taxes and depreciation,
depletion and amortization expense.  Excludes general and administrative and
interest expense.
</FN>