Frequency of Process Control Checks

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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T.O. 33B-1-1 1.5.1.5 Frequency of Process Control Checks. 1.5.1.5.1 Guidelines. NOTE Table 1-3 establishes MAXIMUM process control intervals allowed. Laborato- ries shall use the guidelines listed below to establish their process control requirements and intervals. One of the factors inf luencing the degradation of a penetrant process (materials, equipment and procedures) is the volume of parts being processed. The opportunities for materials contamination, drag-out, equipment malfunction, and procedure deviation are directly proportional to the number of parts being inspected. Since there is no uniformity in workload between activities, a single calendar schedule cannot be established. Each activity SHALL set inspection intervals based on their workloads. The inspection intervals SHALL be documented as shown in Chapter 1, page 1-15, paragraph 1.4.5. Guidance on inspection intervals is provided in the following paragraphs. a. A high volume workload is considered to be a penetrant system that is in continuous use or is utilized for more than 4 hours every workday. A suggested inspection interval for materials verification of high volume penetrant systems is a daily check. b. A medium volume workload is considered to be a penetrant system that is used daily for less than 4 hours. A weekly inspection interval is suggested for materials verification of penetrant systems processing a medium volume workload. c. A low volume workload is considered to be a penetrant system that is used to process parts less than 3 days a week. An inspection interval of once every two weeks is suggested for materials verification of low volume workload penetrant systems. d. In a penetrant system used occasionally with a one-week interval between uses, the minimum monthly verification requirement must apply. 1.5.1.5.2 Specific Requirements. Equipment and process control inspection intervals vary depending upon the specific item to be checked. Many items will degrade on a time rather than a use basis. Equipment and process SHALL be inspected at weekly, monthly, quarterly or semiannual intervals as specified in ASTM 1417 or other applicable process specification. 1.5.2 Process Control Requirements. 1.5.2.1 General. The capability and reliability of penetrant inspections depend upon the materials, equipment, and proce- dures. Degradation in any of the three areas will reduce the effectiveness of the process. The following paragraphs highlight some process steps requiring audit. At minimum these steps should be audited, and additional applicable steps should be added to cover specific equipment or processes as necessary. 1-22 Change 2

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