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FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

(Mark One)

(X) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2005

OR

( ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ________________ to ________________

Commission file number 0-18398


Southwest Royalties Institutional Income Fund IX-B, L.P.
(Exact name of registrant as specified
in its limited partnership agreement)

Delaware 75-2274633
(State or other jurisdiction of (I.R.S. Employer
incorporation or organization) Identification No.)


6 Desta Drive, Suite 6500
Midland, Texas 79705
(Address of principal executive offices)

(432) 682-6324
(Registrant's telephone number,
including area code)

Indicate by check mark whether registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act
of 1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to
such filing requirements for the past 90 days:

Yes X No ___

Indicate by check mark whether the registrant is an accelerated filer (as
defined in Exchange Act Rule 12b-2). Yes No X

The registrant's outstanding securities consist of Units of limited
partnership interests for which there exists no established public market
from which to base a calculation of aggregate market value.

The total number of pages contained in this report is 20.


Glossary of Oil and Gas Terms
The following are abbreviations and definitions of terms commonly used in
the oil and gas industry that are used in this filing. All volumes of
natural gas referred to herein are stated at the legal pressure base to the
state or area where the reserves exit and at 60 degrees Fahrenheit and in
most instances are rounded to the nearest major multiple.

Bbl. One stock tank barrel, or 42 United States gallons liquid volume.

BOE. Equivalent barrels of oil, with natural gas converted to oil
equivalents based on a ratio of six Mcf of natural gas to one Bbl of oil.

Developmental well. A well drilled within the proved area of an oil or
natural gas reservoir to the depth of a stratigraphic horizon known to be
productive.

Exploratory well. A well drilled to find and produce oil or gas in an
unproved area to find a new reservoir in a field previously found to be
productive of oil or natural gas in another reservoir or to extend a known
reservoir.

Farm-out arrangement. An agreement whereby the owner of a leasehold or
working interest agrees to assign his interest in certain specific acreage
to an assignee, retaining some interest, such as an overriding royalty
interest, subject to the drilling of one (1) or more wells or other
specified performance by the assignee.

Field. An area consisting of a single reservoir or multiple reservoirs
all grouped on or related to the same individual geological structural
feature and/or stratigraphic condition.

Mcf. One thousand cubic feet.

Net Profits Interest. An agreement whereby the owner receives a
specified percentage of the defined net profits from a producing property
in exchange for consideration paid. The net profits interest owner will
not otherwise participate in additional costs and expenses of the property.

Oil. Crude oil, condensate and natural gas liquids.

Overriding royalty interest. Interests that are carved out of a
working interest, and their duration is limited by the term of the lease
under which they are created.



Present value and PV-10 Value. When used with respect to oil and
natural gas reserves, the estimated future net revenue to be generated from
the production of proved reserves, determined in all material respects in
accordance with the rules and regulations of the SEC (generally using
prices and costs in effect as of the date indicated) without giving effect
to non-property related expenses such as general and administrative
expenses, debt service and future income tax expenses or to depreciation,
depletion and amortization, discounted using an annual discount rate of
10%.

Production costs. Costs incurred to operate and maintain wells and
related equipment and facilities, including depreciation and applicable
operating costs of support equipment and facilities and other costs of
operating and maintaining those wells and related equipment and facilities.

Proved Area. The part of a property to which proved reserves have been
specifically attributed.

Proved developed oil and gas reserves. Proved oil and gas reserves
that can be expected to be recovered from existing wells with existing
equipment and operating methods.

Proved properties. Properties with proved reserves.

Proved oil and gas reserves. The estimated quantities of crude oil,
natural gas, and natural gas liquids with geological and engineering data
that demonstrate with reasonable certainty to be recoverable in future
years from known reservoirs under existing economic and operating
conditions, i.e., prices and costs as of the date the estimate is made.

Proved undeveloped reserves. Proved oil and gas reserves that are
expected to be recovered from new wells on undrilled acreage, or from
existing wells where a relatively major expenditure is required for
recompletion.

Reservoir. A porous and permeable underground formation containing a
natural accumulation of producible oil or gas that is confined by
impermeable rock or water barriers and is individual and separate from
other reservoirs.

Royalty interest. An interest in an oil and natural gas property
entitling the owner to a share of oil or natural gas production free of
costs of production.

Working interest. The operating interest that gives the owner the
right to drill, produce and conduct operating activities on the property
and a share of production.

Workover. Operations on a producing well to restore or increase
production.


PART I. - FINANCIAL INFORMATION


Item 1. Financial Statements

The unaudited condensed financial statements included herein have been
prepared by the Registrant (herein also referred to as the "Partnership")
in accordance with generally accepted accounting principles for interim
financial information and with the instructions to Form 10-Q and Rule 10-01
of Regulation S-X. Accordingly, they do not include all of the information
and footnotes required by generally accepted accounting principles for
complete financial statements. In the opinion of management, all
adjustments necessary for a fair presentation have been included and are of
a normal recurring nature. The financial statements should be read in
conjunction with the audited financial statements and the notes thereto for
the year ended December 31, 2004, which are found in the Registrant's Form
10-K Report for 2004 filed with the Securities and Exchange Commission.
The December 31, 2004 balance sheet included herein has been taken from the
Registrant's 2004 Form 10-K Report. Operating results for the three month
period ended March 31, 2005 are not necessarily indicative of the results
that may be expected for the full year.







Southwest Royalties Institutional Income Fund IX-B, L.P.
Balance Sheets


March December
31, 31,
2005 2004
------ ------
(unaudit
ed)
Assets
- ---------

Current assets:
Cash and cash equivalents $ 61,002 74,177
Receivable from Managing 76,878 76,872
General Partner
-------- --------
---- ----
Total current assets 137,880 151,049
-------- --------
---- ----
Oil and gas properties -
using the full-
cost method of accounting 3,000,24 3,000,24
7 7
Less accumulated
depreciation,
depletion and amortization 2,665,00 2,661,44
8 8
-------- --------
---- ----
Net oil and gas properties 335,239 338,799
-------- --------
---- ----
$ 473,119 489,848
======= =======
Liabilities and Partners'
Equity
- ----------------------------
- ------------

Current liability - $ 92 188
distribution payable
-------- --------
---- ----
Asset retirement obligation 193,023 189,895
-------- --------
---- ----
Partners' equity (deficit):
General partners (67,710) (66,090)
Limited partners 347,714 365,855
-------- --------
---- ----
Total partners' equity 280,004 299,765
-------- --------
---- ----
$ 473,119 489,848
======= =======














The accompanying notes are an integral
part of these financial statements.

Southwest Royalties Institutional Income Fund IX-B, L.P.
Statements of Operations
(unaudited)

Three Months Ended
March 31,
2005 2004
----- -----
Revenues
- -------------
Income from net profits $ 158,119 124,290
interests
Interest 272 159
Other - 260
-------- --------
-- --
158,391 124,709
-------- --------
-- --
Expenses
- ------------
General and administrative 21,464 20,957
Depreciation, depletion and 3,560 4,000
amortization
Accretion of asset retirement 3,128 3,549
obligation
-------- --------
-- --
28,152 28,506
-------- --------
-- --
Net income $ 130,239 96,203
====== ======
Net income allocated to:

Managing General Partner $ 12,042 9,019
====== ======
General partner $ 1,338 1,001
====== ======
Limited partners $ 116,859 86,183
====== ======
Per limited partner unit $ 11.95 8.81
====== ======



















The accompanying notes are an integral
part of these financial statements.

Southwest Royalties Institutional Income Fund IX-B, L.P.
Statements of Cash Flows
(unaudited)

Three Months Ended
March 31,
2005 2004
----- -----
Cash flows from operating
activities:

Cash received from income from
net profits
interests $ 158,113 126,071
Cash paid to suppliers (21,464) (20,957)
Interest received 272 159
Other - 260
-------- --------
-- --
Net cash provided by operating 136,921 105,533
activities
-------- --------
-- --
Cash flows used in financing
activities:

Distributions to partners (150,000 (120,000
) )
Decrease in distribution payable (96) (181)
-------- --------
-- --
Net cash used in financing (150,096 (120,181
activities ) )
-------- --------
-- --
Net (decrease) increase in cash (13,175) (14,648)
and cash equivalents

Beginning of period 74,177 72,454
-------- --------
-- --
End of period $ 61,002 57,806
====== ======
Reconciliation of net income to
net
cash provided by operating
activities:

Net income $ 130,239 96,203

Adjustments to reconcile net
income to
net cash provided by operating
activities:

Depreciation, depletion and 3,560 4,000
amortization
Accretion of asset retirement 3,128 3,549
obligation
(Increase) decrease in (6) 1,781
receivables
Increase in payables - -
-------- --------
-- --
Net cash provided by operating $ 136,921 105,533
activities
====== ======








The accompanying notes are an integral
part of these financial statements.


Southwest Royalties Institutional Income Fund IX-B, L.P.
(a Delaware limited partnership)

Notes to Financial Statements

1. Organization
Southwest Royalties Institutional Income Fund IX-B, L.P. was organized
under the laws of the state of Delaware on March 9, 1989, for the
purpose of acquiring producing oil and gas properties and to produce
and market crude oil and natural gas produced from such properties for
a term of 50 years, unless terminated at an earlier date as provided
for in the Partnership Agreement. The Partnership sells its oil and
gas production to a variety of purchasers with the prices it receives
being dependent upon the oil and gas economy. Southwest Royalties,
Inc., a wholly owned subsidiary of Clayton Williams Energy, Inc.,
serves as the Managing General Partner. Revenues, costs and expenses
are allocated as follows:

Limited General
Partners Partners
-------- --------
Oil and gas sales 90% 10%
Interest income on capital 100% -
contributions
All other revenues 90% 10%
Organization and offering 100% -
costs (1)
Syndication costs 100% -
Amortization of organization 100% -
costs
Property acquisition costs 100% -
Gain/loss on property 90% 10%
disposition
Operating and administrative 90% 10%
costs (2)
Depreciation, depletion and
amortization
of oil and gas properties 100% -
All other costs 90% 10%

(1) All organization costs in excess of 3% of initial capital
contributions will be paid by the Managing General Partner and
will be treated as a capital contribution. The Partnership paid
the Managing General Partner an amount equal to 3% of initial
capital contributions for such organization costs.

(2) Administrative costs in any year which exceed 2% of capital
contributions shall be paid by the Managing General Partner and
will be treated as a capital contribution.

2. Summary of Significant Accounting Policies
The interim financial information as of March 31, 2005, and for the
three months ended March 31, 2005, is unaudited. Certain information
and footnote disclosures normally included in financial statements
prepared in accordance with generally accepted accounting principles
have been condensed or omitted in this Form 10-Q pursuant to the rules
and regulations of the Securities and Exchange Commission. However,
in the opinion of management, these interim financial statements
include all the necessary adjustments to fairly present the results of
the interim periods and all such adjustments are of a normal recurring
nature. The interim consolidated financial statements should be read
in conjunction with the Partnership's Annual Report on Form 10-K for
the year ended December 31, 2004.

In September 2004, the Securities and Exchange Commission issued Staff
Accounting Bulletin No. 106 ("SAB 106"). SAB 106 expresses the SEC
staff's views regarding SFAS No. 143 and its impact on both the full-
cost ceiling test and the calculation of depletion expense. In
accordance with SAB 106, beginning in the first quarter of 2005,
undiscounted abandonment costs for wells to be drilled in the future
to develop proved reserves are included in the unamortized cost of oil
and gas properties, net of related salvage value, for purposes of
computing depreciation, depletion and amortization ("DD&A"). The
implementation of SAB 106 did not have a material impact on our
financial statements.


Item 2. Management's Discussion and Analysis of Financial Condition and
Results of Operations

General

Southwest Royalties Institutional Income Fund IX-B, L.P. was organized as a
Delaware limited partnership on March 9, 1989. The offering of such limited
partnership interests began on May 11, 1989, minimum capital requirements
were met on September 26, 1989, and the offering concluded on March 31,
1990, with total limited partner contributions of $4,891,000.

The Partnership was formed to acquire royalty and net profits interests in
producing oil and gas properties, to produce and market crude oil and
natural gas produced from such properties, and to distribute the net
proceeds from operations to the limited and general partners. Net revenues
from producing oil and gas properties are not reinvested in other revenue
producing assets except to the extent that production facilities and wells
are improved or reworked or where methods are employed to improve or enable
more efficient recovery of oil and gas reserves. The economic life of the
Partnership thus depends on the period over which the Partnership's oil and
gas reserves are economically recoverable.

Increases or decreases in Partnership revenues and, therefore,
distributions to partners will depend primarily on changes in the prices
received for production, changes in volumes of production sold, lease
operating expenses, enhanced recovery projects, offset drilling activities
pursuant to farm-out arrangements, sales of properties, and the depletion
of wells. Since wells deplete over time, production can generally be
expected to decline from year to year.

Well operating costs and general and administrative costs usually decrease
with production declines; however, these costs may not decrease
proportionately. Net income available for distribution to the partners is
therefore expected to decline in later years based on these factors.

Oil and Gas Properties

Oil and gas properties are accounted for at cost under the full-cost
method. Under this method, all productive and nonproductive costs incurred
in connection with the acquisition, exploration and development of oil and
gas reserves are capitalized. Gain or loss on the sale of oil and gas
properties is not recognized unless significant oil and gas reserves are
sold.

Should the net capitalized costs exceed the estimated present value of oil
and gas reserves, discounted at 10%, such excess costs would be charged to
current expense. As of March 31, 2005, the net capitalized costs did not
exceed the estimated present value of oil and gas reserves.





The Partnership's interest in oil and gas properties consists of net
profits interests in proved properties located within the continental
United States. A net profits interest is created when the owner of a
working interest in a property enters into an arrangement providing that
the net profits interest owner will receive a stated percentage of the net
profit from the property. The net profits interest owner will not
otherwise participate in additional costs and expenses of the property.

The Partnership recognizes income from its net profits interest in oil and
gas property on an accrual basis, while the quarterly cash distributions of
the net profits interest are based on a calculation of actual cash received
from oil and gas sales, net of expenses incurred during that quarterly
period. If the net profits interest calculation results in expenses
incurred exceeding the oil and gas income received during a quarter, no
cash distribution is due to the Partnership's net profits interest until
the deficit is recovered from future net profits. The Partnership accrues
a quarterly loss on its net profits interest provided there is a cumulative
net amount due for accrued revenue as of the balance sheet date. As of
March 31, 2005, there were no timing differences, which resulted in a
deficit net profit interest.

Critical Accounting Policies

The Partnership follows the full cost method of accounting for its oil and
gas properties. The full cost method subjects companies to quarterly
calculations of a "ceiling", or limitation on the amount of properties that
can be capitalized on the balance sheet. If the Partnership's capitalized
costs are in excess of the calculated ceiling, the excess must be written
off as an expense.

The Partnership's discounted present value of its proved oil and natural
gas reserves is a major component of the ceiling calculation, and
represents the component that requires the most subjective judgments.
Estimates of reserves are forecasts based on engineering data, projected
future rates of production and the timing of future expenditures. The
process of estimating oil and natural gas reserves requires substantial
judgment, resulting in imprecise determinations, particularly for new
discoveries. Different reserve engineers may make different estimates of
reserve quantities based on the same data. The Partnership's reserve
estimates are prepared by outside consultants.

The passage of time provides more qualitative information regarding
estimates of reserves, and revisions are made to prior estimates to reflect
updated information. However, there can be no assurance that more
significant revisions will not be necessary in the future. If future
significant revisions are necessary that reduce previously estimated
reserve quantities, it could result in a full cost property writedown. In
addition to the impact of these estimates of proved reserves on calculation
of the ceiling, estimates of proved reserves are also a significant
component of the calculation of depletion, depreciation, and amortization
("DD&A").

While the quantities of proved reserves require substantial judgment, the
associated prices of oil and natural gas reserves that are included in the
discounted present value of the reserves do not require judgment. The
ceiling calculation dictates that prices and costs in effect as of the last
day of the period are generally held constant indefinitely. Because the
ceiling calculation dictates that prices in effect as of the last day of
the applicable quarter are held constant indefinitely, the resulting value
is not indicative of the true fair value of the reserves. Oil and natural
gas prices have historically been cyclical and, on any particular day at
the end of a quarter, can be either substantially higher or lower than the
Partnership's long-term price forecast that is a barometer for true fair
value.


Results of Operations

General Comparison of the Quarters Ended March 31, 2005 and 2004

The following table provides certain information regarding performance
factors for the quarters ended March 31, 2005 and 2004:

Three Months
Ended Percenta
ge
March 31, Increase
2005 2004 (Decreas
e)
----- ----- --------
----
Oil production in 3,295 3,500 (6%)
barrels
Gas production in mcf 15,314 15,870 (4%)
Total BOE 5,847 (5%)
6,145
Average price per $ 44.79 30%
barrel of oil 34.47
Average price per mcf $ 4.72 (6%)
of gas 5.01
Income from net profits $ 158,119 124,290 27%
interests
Partnership $ 150,000 120,000 25%
distributions
Limited partner $ 135,000 108,000 25%
distributions
Per unit distribution
to limited
partners $ 13.80 25%
11.04

Number of limited 9,782 9,782
partner units

Income from net profits

The Partnership's income from net profits interests increased to $158,119
from $124,290 for the quarters ended March 31, 2005 and 2004, respectively,
an increase of 27%. The principal factors affecting the comparison of the
quarters ended March 31, 2005 and 2004 are as follows:

The average price for a barrel of oil received by the Partnership increased
during the quarter ended March 31, 2005 as compared to the quarter ended
March 31, 2004 by 30%, or $10.32 per barrel, resulting in an increase of
approximately $34,000 in income from net profits interests. Oil sales
represented 67% of total oil and gas sales during the quarter ended March
31, 2005 as compared to 60% during the quarter ended March 31, 2004.

The average price for an mcf of gas received by the Partnership decreased
during the same period by 6%, or $.29 per mcf, resulting in a decrease of
approximately $4,400 in income from net profits interests.

The net total increase in income from net profits interests due to the
change in prices received from oil and gas production is approximately
$29,600. The market price for oil and gas has been extremely volatile over
the past decade, and management expects a certain amount of volatility to
continue in the foreseeable future.


Oil production decreased approximately 205 barrels or 6% during the same
period, resulting in a decrease of approximately $7,100 in income from net
profits interests.

Gas production decreased approximately 556 mcf or 4% during the same
period, resulting in a decrease of approximately $2,800 in income from net
profits interests.

The total decrease in income from net profits interests due to the change
in production is approximately $9,900.

Lease operating costs and production taxes were 19% lower, or approximately
$14,100 less during the quarter ended March 31, 2005 as compared to the
quarter ended March 31, 2004. The higher lease operating costs in 2004
were from well repair work performed on a well and production equipment
repairs on a property.

Costs and Expenses

Total costs and expenses decreased to $28,152 for the quarter ended March
31, 2005 from $28,506 for the same period in 2004. This represents a
decrease of 1%. The decrease is a result of lower accretion expense and
depletion expense, partially offset by an increase in general and
administrative expense.

General and administrative costs consist of independent accounting and
engineering fees, computer services, postage, and Managing General Partner
personnel costs. General and administrative costs increased 2% or
approximately $500 during the quarter ended March 31, 2005 as compared to
the quarter ended March 31, 2004.

Depletion expense decreased to $3,560 for the quarter ended March 31, 2005
from $4,000 for the same period in 2004. This represents a decrease of
11%. The contributing factor to the decrease in depletion expense is in
relation to the BOE depletion rate for the quarter ended March 31, 2005,
which was $.61 applied to 5,847 BOE as compared to $.65 applied to 6,145
BOE for the same period in 2004.

Accretion expense decreased to $3,128 for the quarter ended March 31, 2005
from $3,549 for the same period in 2004. This represents a decrease of
12%. The decrease in accretion is from discontinuing accretion on several
wells that reached their projected end of life in 2004.


Liquidity and Capital Resources

The primary source of cash is from operations, the receipt of income from
interests in oil and gas properties. The Partnership knows of no material
change, nor does it anticipate any such change.

Cash flows provided by operating activities were approximately $136,900 in
the quarter ended March 31, 2005 as compared to approximately $105,500 in
the quarter ended March 31, 2004.

Cash flows used in financing activities were approximately $150,100 in the
quarter ended March 31, 2005 as compared to approximately $120,200 in the
quarter ended March 31, 2004. The only use in financing activities was the
distributions to partners.

Total distributions during the quarter ended March 31, 2005 were $150,000
of which $135,000 ($13.80 per unit) was distributed to the limited partners
and $15,000 to the general partners. Total distributions during the
quarter ended March 31, 2004 were $120,000 of which $108,000 ($11.04 per
unit) was distributed to the limited partners and $12,000 to the general
partners.

The source for the 2005 distributions of $150,000 was oil and gas
operations of approximately $136,900, with the balance from available cash
on hand at the beginning of the period. The source for the 2004
distributions of $120,000 was oil and gas operations of approximately
$105,500, with the balance from available cash on hand at the beginning of
the period.

Cumulative cash distributions of $8,216,244 have been made to the general
and limited partners. As of March 31, 2005, $7,449,552 or $761.56 per
limited partner unit has been distributed to the limited partners,
representing a 152% return of the capital contributed.

As of March 31, 2005, the Partnership had approximately $137,800 in working
capital. The Managing General Partner knows of no unusual contractual
commitments. Although the partnership held many long-lived properties at
inception, because of the restrictions on property development imposed by
the partnership agreement, the Partnership cannot develop its non-producing
properties, if any. Without continued development, the producing reserves
continue to deplete. Accordingly, as the Partnership's properties have
matured and depleted, the net cash flows from operations for the
partnership has steadily declined, except in periods of substantially
increased commodity pricing. Maintenance of properties and administrative
expenses for the Partnership are increasing relative to production. As the
properties continue to deplete, maintenance of properties and
administrative costs as a percentage of production are expected to continue
to increase.


Recent Accounting Pronouncements

In December 2004, the Financial Accounting Standards Board ("FASB") issued
Statement of Financial Accounting Standards No. 153 "Exchanges of
Nonmonetary Assets, an amendment of APB Opinion No. 29" ("SFAS 153").
SFAS 153 specifies the criteria required to record a nonmonetary asset
exchange using carryover basis. SFAS 153 is effective for nonmonetary
asset exchanges occurring after July 1, 2005. The Partnership will adopt
this statement in the third quarter of 2005, and it is not expected to have
a material effect on the financial statements when adopted.

In September 2004, the Securities and Exchange Commission issued Staff
Accounting Bulletin No. 106 ("SAB 106"). SAB 106 expresses the SEC staff's
views regarding SFAS No. 143 and its impact on both the full-cost ceiling
test and the calculation of depletion expense. In accordance with SAB 106,
beginning in the first quarter of 2005, undiscounted abandonment costs for
wells to be drilled in the future to develop proved reserves are included
in the unamortized cost of oil and gas properties, net of related salvage
value, for purposes of computing depreciation, depletion and amortization
("DD&A"). The implementation of SAB 106 did not have a material impact on
our financial statements.





Item 3. Quantitative and Qualitative Disclosures About Market Risk

The Partnership is not a party to any derivative or embedded derivative
instruments.

Item 4. Controls and Procedures

The Managing General Partner has established disclosure controls and
procedures that are adequate to provide reasonable assurance that
management will be able to collect, process and disclose both financial and
non-financial information, on a timely basis, in the Partnership's reports
to the SEC. Disclosure controls and procedures include all processes
necessary to ensure that material information is recorded, processed,
summarized and reported within the time periods specified in the SEC's
rules and forms, and is accumulated and communicated to management,
including our chief executive and chief financial officers, to allow timely
decisions regarding required disclosures.

With respect to these disclosure controls and procedures:

management has evaluated the effectiveness of the disclosure
controls and procedures as of the end of the period covered by
this report;

this evaluation was conducted under the supervision and with the
participation of management, including the chief executive and
chief financial officers of the Managing General Partner; and

it is the conclusion of chief executive and chief financial
officers of the Managing General Partner that these disclosure
controls and procedures are effective in ensuring that
information that is required to be disclosed by the Partnership
in reports filed or submitted with the SEC is recorded,
processed, summarized and reported within the time periods
specified in the rules and forms established by the SEC.

Internal Control Over Financial Reporting
There has not been any change in the Partnership's internal control over
financial reporting that occurred during the quarter ended March 31, 2005
that has materially affected, or is reasonably likely to materially affect,
its internal control over financial reporting.




PART II. - OTHER INFORMATION


Item 1. Legal Proceedings

None

Item 2. Changes in Securities

None

Item 3. Defaults Upon Senior Securities

None

Item 4. Submission of Matter to a Vote of Security Holders

None

Item 5. Other Information

None

Item 6. Exhibits and Reports on Form 8-K

(a) Exhibits:

31.1 Rule 13a-14(a)/15d-14(a) Certification
31.2 Rule 13a-14(a)/15d-14(a) Certification
32.1 Certification of Chief Executive Officer
and Chief Financial Officer
Pursuant to 18 U.S.C. Section 1350, as adopted
Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002


SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


Southwest Royalties Institutional Income
Fund IX-B, L.P., a Delaware limited partnership


By: Southwest Royalties, Inc.,
Managing
General Partner


By: /s/ L. Paul Latham
L. Paul Latham
President and Chief Executive Officer




Date: May 16, 2005


SECTION 302 CERTIFICATION Exhibit 31.1


I, L. Paul Latham, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Southwest
Royalties Institutional Income Fund IX-B, L.P.

2.Based on my knowledge, this report does not contain any untrue statement
of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered
by this report;

3.Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations and cash flows
of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
registrant and have:

a)Designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to
us by others within those entities, particularly during the period in
which this report is being prepared;

b)Evaluated the effectiveness of the registrant's disclosure controls
and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end
of the period covered by this report based on such evaluation; and

c)Disclosed in this report any change in the registrant's internal
control over financial reporting that occurred during the registrant's
most recent fiscal quarter (the registrant's fourth fiscal quarter in
the case of an annual report) that has materially affected, or is
reasonably likely to materially affect, the registrant's internal
control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based
on our most recent evaluation of internal control over financial
reporting, to the registrant's auditors and the audit committee of
registrant's board of directors (or persons performing the equivalent
functions):

a)All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which
reasonably likely to adversely affect the registrant's ability to
record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrant's internal
control over financial reporting.


Date: May 16, 2005 /s/ L. Paul Latham
L. Paul Latham
President and Chief Executive Officer
of Southwest Royalties, Inc., the
Managing General Partner of
Southwest Royalties Institutional Income
Fund IX-B, L.P.




SECTION 302 CERTIFICATION Exhibit 31.2


I, Mel G. Riggs, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Southwest
Royalties Institutional Income Fund IX-B, L.P.

2.Based on my knowledge, this report does not contain any untrue statement
of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered
by this report;

3.Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations and cash flows
of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
registrant and have:

a)Designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to
us by others within those entities, particularly during the period in
which this report is being prepared;

b)Evaluated the effectiveness of the registrant's disclosure controls
and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end
of the period covered by this report based on such evaluation; and

c)Disclosed in this report any change in the registrant's internal
control over financial reporting that occurred during the registrant's
most recent fiscal quarter (the registrant's fourth fiscal quarter in
the case of an annual report) that has materially affected, or is
reasonably likely to materially affect, the registrant's internal
control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based
on our most recent evaluation of internal control over financial
reporting, to the registrant's auditors and the audit committee of
registrant's board of directors (or persons performing the equivalent
functions):

a)All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which
reasonably likely to adversely affect the registrant's ability to
record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrant's internal
control over financial reporting.


Date: May 16, 2005 /s/ Mel G. Riggs
Mel G. Riggs
Vice President and Chief Financial
Officer of
Southwest Royalties, Inc., the
Managing General Partner of
Southwest Royalties Institutional Income
Fund IX-B, L.P.






Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND
CHIEF FINANCIAL OFFICER

Pursuant to 18 U.S.C. 1350 and in connection with the accompanying report
on Form 10-Q for the period ended March 31, 2005 that is being filed
concurrently with the Securities and Exchange Commission on the date hereof
(the "Report"), each of the undersigned officers of Southwest Royalties
Institutional Income Fund IX-B, L.P. (the "Company"), hereby certifies
that:

1. The Report fully complies with the requirements of section 13(a)
or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all
material respects, the financial condition and results of
operation of the Company.


/s/ L. Paul Latham
L. Paul Latham
President and Chief Executive Officer
of Southwest Royalties, Inc., the
Managing General Partner of
Southwest Royalties Institutional
Income Fund IX-B, L.P.

May 16, 2005


/s/ Mel G. Riggs
Mel G. Riggs
Vice President and Chief Financial
Officer of
Southwest Royalties, Inc., the
Managing General Partner of
Southwest Royalties Institutional
Income Fund IX-B, L.P.

May 16, 2005