Wednesday, March 13, 2019


Pipe and Valve Selection Procedure
Fig-Typical Pipe Work In a Project

Pipe and Valve Select and Erect Accordance with Standard Manner

All piping should be designed, manufactured and tested in accordance with British Standards or equivalent Nationals Standards approved by the Engineer. 

In particular, pipe work should meet the requirements of the following standards or their equivalents. 

Dimensions should comply with Table 1 of BS 1600. The minimum wall thickness of carbon steel pipes excluding any allowance for corrosion should be as shown in British Standards:
Typical Pipe Work In a Project
 Diameter Minimum Wall Thickness
00 - 100 mm 150 - 200 mm
250 - 600 mm
Table 2 BS 1387:19674.87 mm

Drains and air vents should be provided as required by the physical arrangement of the pipe work and should be via valves with the drain and vent pipe work led to drain points to the approval of the Engineer.
Screwed pipe work systems should be provided with adequate unions to enable valves and fittings to be removed if required with minimum disturbance to the rest of the pipe system.

Perfect Valves Selection and Erection in Piping Network 


All valves should be suitable for the service conditions under which they are required to operate and those of similar size and performing similar duties should be interchangeable with one another unless otherwise approved.

All valve connections should be suitably protected to prevent damage in transit and the entry of dirt. Plugs driven into the end of valve connections will not be accepted.
All isolating, non-return, control, float, relief and air release valves necessary to ensure full control of all the services provided, are to be included.

All valves should be positioned so as to be readily accessible for operation and maintenance.

All valves up to an including 75 mm bore should be made of gunmetal. Subject to the approval of the Engineer, larger valves may have cast iron bodies with gunmetal fittings.

All valves 50 mm bore and above should be flanged or welded unless otherwise approved.
All valves should be closed by rotating the hand wheels in a clockwise direction when loading at the face of the hand wheel.

Every valve should be provided with an indicator to show clearly the position of the valve and each hand wheel should be fitted with a nameplate with engraved and filled letters of figures to provide an approved inscription which will indicate the purpose of the valve.

In order to prevent mal-functioning and deterioration due to the prevailing climatic conditions, the spindles should be protected in robust weatherproof covers where valves are located outside. The glands should be easily accessible and designed to exert an even pressure on the valve stem without bending. 

Precautions are to be taken to prevent corrosion of the valve spindle where in contact with the valve packing. All valves should have renewable seats where practicable. 

It must be possible to remove and replace or recondition in situation, the seats and gates of valves 50 mm nominal bore and above and any special tools for these purposes are to be included in the Contract. For valves less than 50 mm bore the valve will be removed for maintenance purposes.

Valves Lock Installing Procedure

Where, for operational or safety requirements, a valve should be permanently locked in either the Open or Shut position, i.e. and oil tank drain, a locking device should be provided and should include a padlock chained to the valve and two keys.

Structural Steelwork for Plant Valve and Piping System

All structural steelwork should be detailed, fabricated and erected in accordance with the requirements.

Bolts-Studs-Nuts and Washers for Valve and Piping System 


All bolts and nuts should conform dimensionally to the requirements of BS 3092 or BS 4190 or equivalent National Standard.

The Material of all bolts, studs and nuts for piping systems should conform to the requirements of BS 4505 or equivalent National Standard.

The threaded portion of any bolt or stud should not protrude more than 1.5 threads above the surface of its mating nut.

When fitted bolts are used they should be adequately marked to ensure correct assembly.

Bolts, nuts, studs and washers in contact with sea water or used on piping systems containing sea water should be of the same material as flanges etc.

The use of slotted screws should be avoided; hexagon socket screws or recessed type heads being preferred.

Ensure Safety with Piping System

It’s very important regarding safety in piping system for any kind of project. There are many ways to educate employees the safety induction in a workplace. The laws may said many things, but important what is the easy and effective ways to learn them.

First of all need to ensure the employees with a clear idea of what a pipe containing is. The effective method may be is.

Attaching appropriate symbol;
Label, tag and clear identification of material inside;
Painting the pipe with safety colour;
Using arrow on pipe showing direction of contents flow;

Safety Colour for Piping System

Safety colours are conventionally used for industrial piping system is as below:
 Red, is used for fire quenching materials like water, foam, carbon dioxide, halon etc;
Green, is used for Liquids that are not hazardous by nature- like Liquids, liquid admixtures;
Blue, is used for gases that are not hazardous by nature- like gas, gaseous admixtures;
Yellow, is used for are hazardous by nature- like for flammable or explosive, chemically active or toxic, radioactive, or under extreme temperatures or pressures.

Considering the safety of course follow the local state and international standard like BS, IEC, NFPA, ASME etc., Have a nice and safe workplace.

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