A. Manufacturing

All local steam boilers must be built by Competent Firm (FYK) who is registered with the Department of Occupational Safety and Health (DOSHA) and only the FYK is responsible for submitting the design approval application.

Meanwhile, imported steam boilers must be built by the manufacturer and accompanied by a design verification certificate from the Inspection Authority.

B. Modification

Applications for renovation works must be submitted to the Head Office for approval. Renovation works can only be carried out by Competent Firm (FYK) registered or original makerThe applicant must clearly state in the application letter the proposed modifications that he/she wishes to carry out on the steam boiler or fired pressure vessel.

The scope of renovation works that have been determined by the Department are works that involve cutting, welding, accommodating or riveting parts that are affected by fluid pressure. apart from the scope of repair as follows:

For steam boilers, changes in the arrangement of tubes in the furnace walls, economizers and superheaters.

without changes to the original design that has been approved by the Department or,

with permitted changes to the original design that has been approved by the Department, namely:

replacement of material in the part exposed to fluid pressure where the allowable stress is equal to or greater than the original material, provided that the replacement material meets the requirements of the original design code of the machinery. The minimum thickness of the material shall be equal to or greater than the thickness of the original material.

replacement of 'slip-on flange' with 'weld neck flanges' or vice versa.

Installation of a 'flush patch' on the part affected by fluid pressure.

adding a nozzle without reinforcement which does not require design calculations based on the requirements of the original design code of the machinery.

the addition of a reinforcement nozzle, provided that the specification of the reinforcement nozzle is the same as one of the original reinforcement nozzle designs, is located in the same section and the distance from the other nozzles shall be no less than three times the diameter of the additional reinforcement nozzle.