웹 마케팅 (디지털 노마드)

                        5분 화공안전기술사 기출문제 풀이-12

1. 반응기 조작방법과 구조

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2. 공정안전보고서 이행상태 평가

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3. 화학설비의 기능상실 정도 및 고장심각도

 - 화학설비의 실패율.. kora 운영 및 HSE 자료

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4. 증류탑의 원리

파트너스 활동을 통해 일정액의 수수료를 제공받을 수 있음

                     5분 화공안전기술사 (sub-note 화)

자격증

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                              화공기술사 이야기 - 1

1. ASME B31 Piping

2. 재질비교 KS D 3562 : SPPS 250  JIS STPG 370

3. 기본공식(ASME B31.3)

4. E = quality factor from Table A-1A or Table A-1B

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5.  S = stress value for material from Table A-1 or Table A-1M

6. Ej = Longitudinal Weld Joint Quality Factor

7. W= Weld Joint Strength Reduction Factor,

8. Y = coefficient from Table 304.1.1, valid for  t < D/6 and for materials shown.

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9. PIPE DIAMETER AND WALL THICKNESS

◦The ASME B36.10 and ASME B36.19 specifications cover the dimensions of seamless and welded steel pipes for high and low-temperature service, providing combinations of pipe outside and inside diameter (OD, ID), pipe thickness (WT, designated in “schedule”) and pipes theoretical weights (in pounds per foot and kilogram per meter). ASME B36.10 applies to carbon and alloy steel pipes (example A53, A106, A333, A335); ASME B36.19 applies to stainless steel, duplex, and nickel alloy pipes (like A312, A790, A928, B161, etc).

◦NPS means “nominal pipe size”, which is the internal flow capacity of the pipe (pipe bore capacity). The comparable European term for “NPS” is “DN”

◦WT means “wall thickness”, i.e. the thickness of the pipe wall expressed in inches or millimeters. The higher the thickness of a pipe at a given NPS, the stronger the resistance of the pipe to the pressure of the fluid and its possible corrosion. The pipe thickness is called also “pipe schedule” (abbreviated, “SCH.”). For a given NPS and schedule, the thickness of the pipe is fixed and defined in the applicable ASME standard B36.10 for carbon/alloy steel and ASME B36.19 for stainless and nickel alloy pipes

출처 :

https://blog.projectmaterials.com/pipes/pipe-dimensions-asme-36-10-19/

10. ASME B36.10 PIPE SIZE CHART

11. ASME B36.19 PIPE SIZE CHART

12. KS D 3562 : 2019 두께 치수

1. Provide block valve for isolate the discharge side

2. Provide a pressure gauge (PG or PI) to verify the discharge pressure

3. Provide check valve to protect the pump

4. Control valve SHALL be located at discharge pump

5. Provide minimum flow to protect the pump

Centrifugal pumps should not be used at a low flowrate less than a certain percentage of BEP ( Best Efficiency Point). Generally the minimum flowrate required for centrifugal pump may be in range 50%-70% of BEP.Usually, in the design basic stage, or proposal stage we assume of 30% of rated flow. This assumption shall be updated in project or detail engineering stage based on vendor information and pump performance curve.

The system can use RO or control valve or automatic recirculation valve (ARC).

The rule of thumb say that the control valve system typically becomes economical above 50 hp ( 38 kW) and the RO applied for pumps below 50 hp (38 kW).