scope:

A snubber covered by this specification is a pressure transmission device which restricts the rate of fluid flow to a pressure sensing instrument and, as a result, the rate of pressure change.

Snubbers covered by this specification are classified according to the following as specified (see 6.2):

M2940 - 1 - L - A - P - G Type Class Composition End Cleanliness (see (see (see 1.2.3) connection (see 1.2.5) 1.2.1) 1.2.2) (see 1.2.4)

The type of service in which the snubber will be used is designated by one of the following numbers selected based on the expected fluid temperature (viscosity) at the snubber location:

Type Service 1 Oils, hydraulic fluid above 20 centistokes (cSt). Oil above 225 saybolt universal seconds (SUS) at operating temperatures. 2 Fresh water, steam, gasoline, light oils below 20 cSt. 3 Cases. 4 Seawater (composition B only).

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, SEA 03R42, Naval Sea Systems Command, 2531 Jefferson Davis Hwy, Arlington, VA 22242-5160 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The range of operating pressures is designated by the following letters:

Class Operating range limit L 10 to 1000 pounds per square inch gauge (psi). H 1001 to 6000 psi.

The material composition of the snubber is designated by one of the following letters:

Composition Material A Copper-nickel alloy (see 3.2.1.1). B Nickel-copper (monel) alloy (see 3.2.1.2). C Corrosion resisting steel (see 3.2.1.3).

The configuration for the snubber's end connection is designated by one of the following letters (see 3.3.2):

End connection Application P Pressure gauge general applications (see 3.3.2.1.1). F Pressure gauge flareless (bite type) applications (see 3.3.2.1.2). T Pressure transducer general applications (see 3.3.2.2). S Other applications (see 6.1.1.3). The end connections must be specified in the contract ordering data.

The method for cleaning the snubber is designated by one of the following letters:

Cleanliness Application G General applications. X Oxygen and dry nitrogen applications.

intended Use: