IS 3370:1967 Part 3 is the Indian Standard (BIS) for concrete structures for storage of liquids - prestressed concrete structures. IS 3370 Part 3 lays down the code of practice for the design and construction of prestressed concrete liquid storage structures, focusing on crack control and liquid-tightness. It prescribes permissible stresses, detailing, and prestressing requirements to ensure zero tension at liquid-contact faces.
Provides requirements for the design and construction of prestressed concrete structures for storage of liquids.
Overview
- Status
- Current
- Usage level
- Specialized
- Domain
- Structural Engineering — Tanks, Silos and Storage Structures
- Type
- Code of Practice
Also on InfraLens for IS 3370
Practical Notes
! Ensure zero tensile stress at liquid-retaining faces under service loads to prevent leakage.
! Proper sequence of circumferential and vertical prestressing is critical for cylindrical tanks to avoid cracking during transfer.
! Account for loss of prestress due to shrinkage, creep, and friction as per IS 1343.
Frequently referenced clauses
prestressed concretehigh tensile steelcement
International Equivalents
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International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values5
Quick Reference Values
minimum concrete grade post tensionedM 30
minimum concrete grade pre tensionedM 40
max compressive stress at transfer0.5 fck
minimum clear cover prestressing steel35 mm
allowable tensile stress liquid face0 MPa (No tension condition)
Key Formulas
f = P/A ± Pe/Z ± M/Z — Resultant stress at any section under working load
Tables & Referenced Sections
Key Tables
Table 1 - Permissible Concrete Stresses in Calculations Relating to Resistance to Cracking
Table 2 - Permissible Stresses in Concrete in Structures
Key Clauses
Clause 3 - General Requirements
Clause 4.1 - Basis of Design
Clause 4.2 - Permissible Stresses in Concrete
Clause 4.3 - Permissible Stresses in Prestressing Steel
Clause 6 - Proportioning and Detailing
Clause 7 - Joints
Frequently Asked Questions3
Is tensile stress allowed in the concrete for liquid storage?+
No, prestressed concrete liquid retaining structures are generally designed to have no tensile stress under working conditions to ensure complete liquid-tightness.
What is the minimum concrete grade for prestressed tanks?+
M40 for pre-tensioned and M30 for post-tensioned members.
What cover is recommended for prestressing cables?+
A minimum clear cover of 35 mm or the diameter of the cable/duct, whichever is greater.
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.