IS: 1200 (Part VI) – 1974 ; method of measurement of refractory work
- SCOPE
1.1 This standard covers the method of measurement of refractory work. - GENERAL RULES
2.1 Clubbing of Items – Items may be clubbed together provided that the breakup of the clubbed items is agreed upon based on the detailed description of the items stated in this standard.
2.2 Booking of Dimensions – In booking dimensions, the order shall be consistent and generally in the sequence of length, breadth or width, and height or depth or thickness.
2.3 Measurement Units:- Unless otherwise stated herein, all work shall be measured net in the decimal system, as fixed in place, as given in sections 2.3.1 to 2.3.4.
- Dimensions shall be measured to the nearest 0.01 m.
- Areas shall be worked out to the nearest 0.01 m².
- Cubic content shall be worked out to the nearest 0.01 m³.
- Weight shall be worked out to the nearest 0.001 tonne.
2.4 Description of Items – The description of each item shall, unless otherwise stated, include conveyance, delivery, handling, unloading, storing, necessary scaffolding, platforms, walkways, tools and tackles, stacking item-wise, opening of packages, disposal of wood, straw, etc. This shall also include the use of necessary equipment, safety appliances, lighting at the place of work, ventilation facilities, where necessary.
2.5 Waste – All measurement of cutting shall, unless otherwise stated, be deemed to include consequent waste.
2.6 Deductions – Where a minimum area is defined for the deduction of opening voids or both, such area shall refer only to openings or voids within the space measured. Rules for rounding off numerical values (revised).
- MEASUREMENT METHODS
3.1 The items of work, wherever necessary and unless otherwise stated, shall be deemed to include the following:- Dressing of bricks/blocks including cutting, grinding, and chipping to achieve proper thickness of joint and alignment as required in the drawings for all classes of work.
- Dressing of bricks/blocks including cutting, grinding, and chipping wherever necessary for expansion joints, sliding joints, binding joints, etc., to ensure proper curvature and keying in arches, curved surfaces, etc.
- Forming of expansion joints, sliding joints, etc., excluding filling (for filling see 3.8).
- Finishing, pointing, clearing, and cleaning of masonry joints, gaps, hollows, cavities, opening passages, ducts, etc.
3.2 The refractory and insulation bricks and blocks, types of mortars and powders to be used shall be fully described. Other auxiliary and filling materials, such as paper, cardboard, asbestos materials, mineral wool, water glass, coke pitch, carbon mass, special sands, crumbs, powders, admixtures, and plasticizers required to be incorporated in the works shall also be described.
3.3 All refractory work, unless otherwise specified, shall be measured in cubic meters. The measurement shall be inclusive of mortar joints, expansion joints, and sliding joints. Deductions for voids, openings, etc., shall be made only when the area of each such opening and void exceeds 1 square meter.
3.4 The method of measurement on a volumetric basis as specified in 3.3 shall also apply for castable refractory work or refractory concreting, rammed, mass filling; filling of loose insulation materials, such as mica crumbs, slag wools, asbestos powders, fireclay mass, and carbon mass.
3.5 Where the brick/blocks lining is separated from the shell or wall surface by the use of asbestos, cardboard, etc., such insulating material shall be fully described and measured separately in square meters.
3.6 Where insulation plaster is applied over the refractory surface, the same shall be fully described and measured separately in square meters.
