Piping prefabrication

Will related disciplines be separated contractually or combined For example, will mechanical equipment erection and piping prefabrication/erection be the subject of two distinct contracts or of a combined contract, which in effect shifts the interface between the two disciplines from the EPCM contractor to the single chosen construction contractor ... 

A special audit may be initiated in response to a situation giving rise for concern, for example loss of traceability in a piping prefabrication shop. 

Pump sets, intake screens and filters, valves, manifold, crane Piping prefabrication and erection with supports, connections to heat exchangers (interfaces with other systems) Cabling and connections, earthing, cathodic protection Low suction level and vibration protection on pumpsets, pressure and flow measuring systems, cabling, etc. 

Prefabricated Interconnecting Oil Piping. Oil Reservoir Located Separate ... 

When there is a cost-plus contractor, the representative tries to make certain the laborers are being properly used. He may run into such problems as a grievance over whether certain items such as piping may be prefabricated in a shop or whether they must be put to together in the field. In other cases, he may have to act as the mediator between the contractor and the union. 

Prefabricated units, other than regularly manufactured buttwelding fittings, that employ plate and longitudinal seams, as contrasted with pipe that has been produced and tested under one of the specifications listed in this Part, shall be designed, constructed, and tested under requirements of the ASME BPV Code Section VIII, Division 1. These requirements are not intended to apply to such partial assemblies as split rings or collars, or to other field-welded details. 

Tubing must be provided precleaned and capped. The prefabricated parts must be stocked cleaned and capped to prevent introduction of contaminants into the piping system. The bending of tubes is not allowed. 

The new air-supported still will be of prefabricated construction. Teslar films will be used and the still will feature bays about 8 feet wide as compared with the 3-foot bays of the present still. Thus, the amount of curbing needed will be reduced considerably. Also, the piping will be greatly simplified, further reducing the cost of construction. Extruded plastic caps are being considered for the concrete curbs to simplify curb construction. Three 100-foot-long bays, providing a total of 2400 sq. feet, are planned for construction at the station. 

The work was considered normal maintenance and presented no special hazards. Employees carried a prefabricated section of replacement piping to the sphere containing hundreds of tons of a flashing flammable liquid. The boiling point of this material was 8° F (—13° C) and it was stored under several atmospheres of pressure. [6]... 

The prefabricated piping spool was not exactly the right size, so it was being removed and returned to the workshop to make it useful. Before returning to the shop with the ill-fitting spool, the fitter and two assistants decided to move the old pipe further away. Somehow, the hanging actuator suddenly dragged the valve handle to the open position. 

Execute some work offsite e.g., prefabrication of pipe. 

Note of caution When checking estimates, it must be remembered that on sizes 2 1/2 in. and above, the process area pipe is usually prefabricated away from the field and some estimates would show pipe fabricated offsite as material cost. In that case, the cost will include ... 

There are three mid-sized mechanical contractors, qualified to do industrial piping and equipment erection, with demonstrated capability of handling projects requiring more than seventy workers. Two of them also have piping fabrication shops and asked to be considered for the prefabricated piping purchase. All of them asked to bid for the structural steel erection. 

It is important to note that the hours involved in the prefabrication of pipe in offsite shops are not included in the field construction activities. 

Prefabricated molded pipe insulation is specified by an ASTM Dimensional Standard system which provides great flexibility in the choice of thickness. The actual thickness of any given pipe insulation is one-half... 

Application of Pipe Insulation. Prefabricated insulation is applied to a pipe with joints tightly butted and pointed up. Each section of insulation is wired to the pipe with not less than three loops of 16-gauge annealed iron wire on pipe up to and including 6 in. and with not less... 

Widespread application of precast products such as manholes and handholes, prefabricated cellars or stockrooms, pipes, permanent forms, trenches, gutter covers, terrazzo tiles and panels, sinks, washstands, bathtubs, septic tanks and machine tool structures [84]... 

These are followed by balance jobs such as fabricating/fixing prefabricated supports for ducts and pipelines, fabricating and then connecting ducts and piping to process vessels, installation of instrumentation probes and connecting cables, thermal insulation of process vessels and ducts/pipes. 

Drainage fabrics n. Fabrics used as filter media or separators in subsurface drainage systems. The fabric is installed around the drainage pipe, or coarse stone in the drain it allows water to pass freely from the soil to the drain, but prevents soil particles from migrating into the drain system. These fabrics are also used as outer coverings in prefabricated drainage composites and serve the same function as a filtering medium. 

Prefabricated polystyrene foam sheets are used mainly for thermal insulation and waterproofing in basements. Polyethylene foam is used, e.g. for pipe insulation, and is fixed with an adhesive or tape. Urea-formaldehyde foam was used for improving thermal insulation in old houses, but uncontrollable formaldehyde emissions have caused its use to be minimised. Polyurethane foam is used for thermal insulation as prefabricated foam forms, e.g. on pipes and as sheets on roofs or walls. In pipe insulation, adhesives may be used in fixing. Uncured diphenylmethane diisocyanate-based (MDI) polyurethane foam is sprayed on site (e.g. for window frames) or for technical applications (e.g. on large boilers). When spraying foam on boilers, good ventilation and personal protection is needed. Tools used in thermal insulation include knives, saws, scissors, jointing tools, etc. 

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