Turbo Power & Marine Systems

Jet Blast Company
208 Grand Avenue
P.O. Box 4520
Stockyards Station
Fort Worth, Texas 76106

Attention: Mr. Herman Dawson

Subject:

Acceptable Jet Engine Type Material for Gas Path Carbon Removal in GG4/FT4 and GG3 Industrial Turbine Engines

Reference:

Jet Blast Company Letter, Mr. Herman Dawson to A. Yacovone, August 9, 1971

Gentlemen,

In response to your request for Jet Blast turbine cleaning company approval, we no longer have a specific program for evaluation and approval of brand name dry media gas path cleaning products.  We stipulate that a material is acceptable for use in our gas turbine engines if that material completely satisfies all the requirements of Military Specification MIL-G-5634 (June 5, 1971) pertaining to aircraft jet engines.

Please be particularly attentive to all the requirements of MIL-G-5634C applicable to aircraft jet engines and our industrial gas turbine engines as well.  We also wish to emphasize that aircraft jet engine classification Type I (apricot pit shell), Type III (black walnut shell) and Type VI (english walnut shell, apricot pit shell or mixture of two) only are allowable per MIL-G-5634C.  Note, Type II (Pecan shell), Type IV (corn cob), and Type V (rice hull) are no longer acceptable for aircraft jet engines as they formerly were by Revision B of MIL-G-5634 (February 17, 1966).

If you need any further assistance, please advice us.

Very truly yours,

Turbo Power and Marine Systems, Inc.

A. F. Yacovone, Supervisor
System Support Engineering

Westinghouse Electric Corporation

Mr. H. Dawson
Jet Blast Company
208 Grand Avenue
P.O. Box 4520 Stockyards Station
Fort Worth, Texas . . . 76106

Dear Mr. Dawson:

I have just finished the lab analysis of the sample of jet blast that you sent us.   Enclosed you will find a copy of the ash fusion and chemical analysis results.   Tests of jet blasts corrosiveness were made in a static corrosion rig.  It was tested for forty-four and seventy hours, and caused no visible signs of corrosion on the specimens.

Based on the lab analysis, I have recommended jet blast, as being an acceptable compressor cleaning compound, as long as it meets the following requirements:

1. It must have an ash melting point in excess of 1950°F
2. It must have a chemical composition very similar to the sample I tested.
3. In particular the concentration of Na, Mg and C1 must be maintained equal to or lower than the concentrations in the sample I tested.

Cordially,

M.F. Brady
Metallurgy B-3

Industry Approval Letters

Rolls-Royce Limited

Jet Blast Co.
208 Grand Avenue,
P.O. Box 4520
Stockyards Station,
Fort Worth,
Texas 76106,
U.S.A.

Dear Sirs,

'Jet Blast' cleaner for use in Rolls-Royce engines

Further to your letter of January 12th 1971, we have examined a sample of your 'Jet Blast' abrasive cleaner and find it suitable for use in Rolls-Royce Marine and Industrial Gas Turbines subject to the following exclusions and limitations:

Avon Engines
No limitations but we would advise that the method and frequency of application are as laid down in the maintenance manual for this engine.

Proteus Engines
The only exclusion for its use is for those engines for which A. R. B. (Air Registration Board) approval is required i.e. for certain Hovercraft applications.  Again we would recommend that reference be made to the maintenance manual for this engine.

Olympus and Tyne Engines
The use of granular cleaner cannot be accepted for these engines.

We trust that the information given above is sufficient for your requirements.

Yours faithfully for Rolls-Royce Limited

R. L. Monk (Sales Engineer)

General Electric

Mr. H. Dawson
Jet Blast Company
208 Grand Avenue
P.O. Box 4520 Stockyards Station
Fort Worth, Texas  76106

Dear Mr. Dawson:

With regard to your letter of February 12, 1969, I have attached a copy of our GEI 41042C which covers cleaning of our gas turbine compressors.  You will note that Jet blast is one of the recommended material for this purpose.

I'm afraid I have no experience with cleaning procedures for turbo supercharged reciprocation units.   I suggest this information be obtained from the manufacture involved.

Very truly yours,

Allan D. Foster
Manger - Materials Development
Bldg. #53-339
Ext. 54311/53907

P.O. Box 4520
Ft. Worth, Tx 76164
Telephone (817) 860-9898
Fax (817) 274-1339
Telephone (800) 259-2761 (US only)
info@dennisdawson.com

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