Tank Specialties of California Announces Leadership Transition and Continued R Stamp Certified Welding Service
Fresno, United States – May 10, 2026 / Tank Specialties of California /
Tank Specialties of California announces the retirement of longtime manager Darrel Dietz and the promotion of Grayson Cardoza to manager, marking a leadership transition that continues the company’s focus on certified repair work, regulatory compliance, and dependable service for fleet operators and cargo tank customers.
Dietz helped shape the company into a trusted resource for cargo tank inspection, repair, and customization throughout the Central Valley and beyond. His leadership contributed to a reputation built on technical capability, consistency, and a practical understanding of the industries served.
Cardoza assumes the role with a focus on maintaining those standards while supporting customers with certified repair services and clear guidance on compliance requirements. Tank Specialties continues to operate as a single-source provider for cargo tank services, working alongside Advanced Emission to support both cargo tank systems and diesel emissions compliance.
Tank Specialties of California continues to maintain its R Stamp #9199 certification, allowing the company to perform pressure system repairs in accordance with the National Board Inspection Code (NBIC). This certification is required for repairs and alterations involving pressure-retaining equipment, including cargo tank systems used across fuel, chemical, agricultural, and other transport applications.
R Stamp welding ensures that repairs meet nationally recognized standards and are supported by proper documentation and inspection oversight. This level of certification is essential for equipment that must meet regulatory requirements and remain in service without disruption.
Tank Specialties supports customers with:
- Cargo tank inspection and testing
- Certified R Stamp pressure system repairs
- Tank repair and customization
- Compliance support for DOT and safety requirements
With decades of combined experience and a broad range of in-house capabilities, Tank Specialties supports customers across multiple industries with inspection, repair, fabrication, and compliance-focused services designed to keep equipment operating safely and efficiently.
To learn more about R Stamp welding services or to schedule an assessment, visit tankspecialtiesca.com or call (559) 579-1450.
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About Tank Specialties of California: Tank Specialties of California provides cargo tank inspection, repair, and customization services for fleets and operators throughout Fresno, the Central Valley, and surrounding regions. As part of the RV Jensen family of companies, and in partnership with Advanced Emission, the company also supports diesel emissions compliance, Clean Truck Check testing, and related services, offering a comprehensive approach to fleet safety, performance, and regulatory requirements.
Contact Information:
Tank Specialties of California
2695 South 4th Street
Fresno, California 93725
United States
Tracy Jensen
+1-559-579-1450
https://tankspecialtiesca.com
