Equipment's Anchor Bolt - Tolerance of installation and Torque value (설치공차, 토크 값)

 

 

STUDY HARD

 

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설치공차

(Tolerance of installation)

 

 

◈ API 686 (Recommended Practice for Machinery Installation and Installation Design), Chapter 4 — Foundation, 18 Anchor Bolts and Sleeve Installation 의 1항에 따라 우선적으로 Manufacturer(Vendor) 의 Recommendation 값이 고려되어야 한다.

 

 혹 Recommendation 값이 명시되어 있지 않은 경우, 철골 혹은 토목의 Tolerance 값을 사용하는 경우가 더러 있다. (Owner 와 협의하기 나름)

 

  Ex) 철골 Tolerance; Each = ± 1.5mm, Each Other = ± 3.0mm (1/8 in.)

 

 

※ API 686, Chapter 4, 18.1

  Anchor bolts and sleeves shall be located to the manufacturer’s specified tolerances in all three planes and securely supported to prevent misalignment during the concrete placement operation. The anchor bolts shall not be reduced in diameter nor offset to facilitate alignment with the mounting plate. Modification of the mounting plate to facilitate alignment is not permitted unless authorized by the designated machinery representative.

 

※AISC

  Code of Standard Practice for Steel Buildings and Bridges; 7.5.1 The variation in dimension between the centers of any two Anchor Rods within an Anchor-Rod Group shall be equal to or less than 1/8 in. [3 mm].

 

 

 

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토크 값

(Torque value)

 

 

◈ Euipment 설치 후, Anchor Bolt Tightening 시 필요한 Torque Value 는 우선적으로 Manufacturer(Vendor) 의 Recommendation 값이 고려되어야 한다. 실제 국제 Code & Standard 에는 명확한 값이 명시되어 있지 않다.

 

 혹 Recommendation 값이 명시되어 있지 않은 경우, API 686 (Recommended Practice for Machinery Installation and Installation Design), Chapter 9 — Machinery Installation: Commissioning, 3.15 Post-grouting Instructions 의 7항(3.15.7)에 따라 API 686, Table B.1 에 값을 사용할 수 있다.

 

 

※ API 686, Chapter 9, 3.15.7

  Lubricate all anchor bolt threads liberally with mineral oil and torque anchor bolts in accordance with the equipment manufacturer’s recommendations. Table B.1 may be used as a guide if manufacturer information is not available.

 

※ Annex B (informative) Anchor Bolt Torque Tables

   - Table B.1 30,000 psi Internal Bolt Stress

 

NOTE 1 All torque values are based on anchor bolts with threads well-lubricated with oil (NOT anti-seize compound). The use of anti-seize compounds will reduce these torque values.

NOTE 2 In all cases the elongation of the bolt will indicate the load on the bolt.