Method of measurement of building and civil engineering works, Part 20: laying of gas and oil pipelines
1981 Edition

The standard extends beyond building structures to encompass civil engineering projects including industrial facilities and river valley developments. It establishes a unified method for measuring pipeline-related works, ensuring consistency among various agencies. Final numerical results for tests and analyses must be rounded according to IS 2:1960, preserving the required significant figures. Detailed descriptions cover pipeline connections to submains and other pipelines as per Clause 3.11.2.

This section outlines general principles for quantifying gas and oil pipeline installation. Key rules include rounding off test and analysis values per IS 2:1960, and defining the measurement scope to include excavation, laying, jointing, testing, and backfilling. No explicit formulas are provided here; detailed rules are located in subsequent clauses.

Items may be combined only when detailed descriptions align with the standard. Each item description inherently includes handling, fabrication, installation, cutting allowances, and incidental operations. Pipe supports like hangers and chairs must be enumerated separately. This ensures precise and transparent measurement and billing practices.

Dimensions should be recorded consistently in the order: length, breadth/width, then height/depth/thickness. All measurements are net as fixed and rounded to the nearest 0.01 metre. Bills of quantities must describe materials and workmanship clearly to represent the work accurately.

All dimensions are to be measured net to the nearest 0.01 metre, following the prescribed booking sequence. Rounding of final values from tests or calculations must comply with IS 2:1960, maintaining the specified significant figures to ensure accuracy and uniformity.

Bills of quantities must comprehensively describe the materials, workmanship, and scope of work. Components such as pipe supports require separate enumeration. The standard promotes uniform measurement methods to eliminate ambiguity and ensure consistency across building and civil engineering projects.

Special pumping activities, excluding rain or sub-soil water, are to be measured separately in kilolitres. Measurement methods refer to IS 1200 Part 1 Clause 2.7, where work is recorded in stages relative to ground or datum lines. Accurate recording of flow rate and pumping duration is essential.

Measurement should be conducted in defined stages categorized as below or above the ground/datum line, which must be explicitly specified. This practice aids in progress monitoring and payment processes, ensuring clarity and precision.

This part details the measurement methods for pipeline laying activities such as length measurement along the centerline, classification by diameter and thickness, enumeration of fittings and accessories, trench excavation and refilling, and testing and commissioning. Pipes are measured net length excluding overlaps; fittings and testing are accounted for separately.

Pipes are classified by diameter, material, quality, and joining technique. Length is measured in running meters along the pipe centerline excluding fittings, which are enumerated separately. Hydrostatic and radiographic tests are measured distinctly, with cutting and jointing included in fitting measurements.

Pipes located within ducts, trenches, chases, or embedded in floor screeds must be clearly specified in terms of size, location, and fixing methods. Excavation and refilling volumes are measured following IS 1200 Part 1 guidelines, and concrete bedding and haunching are measured in running meters with specified concrete mixes.

Pipes embedded in floor screeds require clear description and separate measurement. Concrete beds, haunchings, and coverings are measured in running meters with specified dimensions and mix designs. Supports such as hangers and chairs are enumerated separately, and insulation is measured along the pipe centerline without additional allowances for bevelled ends.

Testing includes hydrostatic and radiographic methods. Hydrostatic tests are measured in running meters of pipe tested under pressure, while radiographic tests are measured per centimetre length of pipe inspected. Test results must be rounded according to IS 2:1960 to maintain precision.

Pigging, pickling, and purging operations are measured and recorded as separate items. Length cleaned or treated is measured in running meters, while purging volume is measured in cubic meters or running meters. No specific formulas are given; however, volume calculations may consider pipe cross-sectional area and length.

Miscellaneous activities such as railway crossings, culverts, pavement cutting, pipeline deviations, and dismantling are measured as per relevant standards. Connections to submains and pipe supports are fully described and enumerated separately to maintain clarity and accuracy.