IS 14458

: 1997

Code of practice for piezocone penetration test (CPTU)

CurrentEssentialSpecificationGeotechnical · Surveying and Geotechnical Investigation
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This standard (Part 1) specifies general performance requirements for ergonomics, innocuousness, sizing, marking, and information to be supplied by the manufacturer for all types of personal protective equipment (PPE). It is a foundational document intended to be used in conjunction with specific standards for particular PPE products.

Lays down the procedure for conducting the Piezocone Penetration Test (CPTU) in soils for continuous profiling of soil properties.

Quick Reference Values
pH of materials in contact with skinMust be between 3.5 and 9.5
Maximum hexavalent chromium in leather components< 3.0 mg/kg
Water vapour resistanceShould be as low as possible for comfort
Minimum height of pictogram on marking10 mm
Release of nickel from metallic parts in prolonged skin contact< 0.5 µg/cm²/week
Key Formulas
qt = qc + u2(1-a) — Corrected Cone Resistance
Fr = (fs/qt) x 100% — Friction Ratio
Bq = (u2 - u0) / (qt - σv0) — Pore Pressure Parameter
Practical Notes
This is a horizontal standard; its requirements apply to all PPE unless overridden by a specific product standard (e.g., IS 2925 for safety helmets).
It focuses on user safety from the PPE material itself (e.g., skin irritation, allergies) and usability, not the specific hazard the PPE protects against.
Always check for the IS marking and review the manufacturer's information leaflet, which is a mandatory requirement under this standard.