standard specification for fabrication and erection of piping

necessary by the Engineer in charge for process lines. The details for the type of connections to
be adopted shall be given to the contractor at the time of work.
After the piping is erected in final position, it shall be cleaned, tested for tightness and kept dry
wherever instructed, as described in this specification.
Valves
The valve spindle positions are shown in the arrangement drawings and the contractor shall be
required to follow them. He shall, however, bring it to the notice of the Engineer in charge in
case he encounters some difficulty in installing them.
Where practicable and except when otherwise shown on the drawings, valve stems shall be
installed in a vertical direction and shall not be installed with stems below the horizontal axis.
Supports
Supports, guides and anchors for piping shall be fabricated and provided as shown in the
drawings. No anchors on piping shall be used except at locations shown in the drawings. The
pipe shall be secured firmly at anchor supports.
Fabrication and erection of supporting elements and structural fixtures wherever required and
pointed out by the Engineer in charge, whether indicated in drawing or not, to prevent vibration,
excess sag etc. shall be carried out by the contractor. No separate payment will be made for
erecting of these additional supports and it will be deemed as part of piping erection work.
4. LAYING OF UNDERGROUND PIPING
The Contractor shall lay the underground piping in accordance with the following clauses and as
per the piping arrangement drawings/stetches issued during the course of construction. Coating
and wrapping of the underground lines shall be in accordance with specification.
The contractor shall dig the pipe line trenches where necessary according to the drawing, true to
the line and gradient as per specifications and as directed by the Engineer-in-charge.
The contractor shall be responsible for correct layout and gradient of the line. Errors, if any, shall
be rectified by the Contractor at his own cost.
Trenching: (Refer specification for Earthwork in underground piping)
The trench shall be cut true to the line leveled with the help of sight rails provided at every 30 M at
change of direction, gradient and at any suitable distance as directed by Engineer in charge.
If the trench is excavated below the required level indicated in the drawing, the extra depth shall
be filled with concrete or approved equivalent material as directed by the Engineer in charge at
no extra cost to owner.
The trench shall be excavated so as to provide an average cover of 1000 mm or equal to the
diameter of the largest pipe to be laid in the trench, or as shown in drawings whichever is greater.
The average cover will be reckoned from top of the pipe of the largest diameter to be laid in the
trench, to the finished grade. The width of the trench shall be sufficient to give free working