SD-15 Guide For Performance SpecificationsThis document provides guidance information on performance specifications focusing primarily on stating requirements in performance terms and ensuring that sufficient verification means are included in the specification to evaluate conformance. While the focus of this document is on defense specifications developed under DoD 4120.24-M, Defense Standardization Program DSP Policies and Procedures, the principles and techniques can also be applied to program unique performance specifications, performance-based purchase descriptions, commercial item descriptions, or any other type of procurement specification. This guide is intended to supplement the format and content requirements for writing performance specifications found in MIL-STD-961, Defense and Program-Unique Specifications Format and Content.

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Performance Specification Guide SD-15

EXAMPLE 7 - PROCESS REQUIREMENTS

Another significant difference between a detail specification and a performance specification is that a detail specification often has specific and extensive requirements for such processes as welding, soldering, plating, cleaning, finishing, coating, painting, etc. Performance specifications usually do not specify processes, or the requirement is stated as the desired outcome from a process, requires the contractor's normal commercial processes, or is provided as guidance. All of these approaches were used when MIL-F-19004A, Fans, Centrifugal, Fixed and Portable, Ventilation, Naval Shipboard was rewritten as a

performance specification. Both the detail military and revised performance specification can be viewed in their entirety on the ASSIST database at https://assist.daps.dla/quicksearch/.

MIL-F-19004A, Fans, Centrifugal, Fixed and Portable, Ventilation, Naval Shipboard

MIL-PRF-19004B, Fans, Centrifugal, Ventilation, Naval Shipboard

3.5.1.2 Welded parts. Welded parts shall have all traces of flux removed before painting. This may be accomplished by brushing the welds while immersed in boiling water. For inaccessible welds, the part may be cleaned by immersion in a cold solution of 10 percent sulfuric acid for 30 minutes, or a 5 percent

solution of sulfuric acid held at 150°F for 10 minutes. The acid shall contact both the inside and outside surfaces. The acid treatments shall be followed by a rinse in clean, warm water until no trace of acid is detected. Residual flux may be detected by leaching the surface with distilled water, and adding a few drops of 5 percent silver nitrate solution to the leach. A white precipitate indicates the presence of flux.

3.5.4 Painting. Exposed surfaces of fan impellers, interior surfaces of fan scrolls, exposed surfaces of all parts in the air stream and exterior surfaces of motors not previously painted shall be given a coat of zinc-chromate primer in accordance with TT-P-645, followed by a coat of phenolic varnish in accordance with TT-V-119. The exterior of all fan scrolls (except type 0 fans) and conduit boxes shall be given two coats of zinc-chromate primer. The exterior surface of type 0 fans shall be given one coat of zinc-chromate primer, followed by a finish coat of red paint in accordance with

TT-E-489.

3.3 Painting and welding.

3.3.1 Factory coating. Equipment and component items shall be delivered with the manufacturer's standard finish, except as to comply with the requirements of 3.2.

3.3.2 Welding and allied processes. Surfaces of parts to be welded or brazed shall be free from rust, scale, paint, grease, and other foreign matter. Welding and allied processes shall be performed by personnel certified to American Welding Society standards. NAVSEA Technical Publication S9074-ARGIB-010/278 may be used for guidance.