We do field service in          Houston, TX         Brenham, TX          
                                Odessa, TX       Midland TX 
Contact us at (432) 254-8617

API RP 4G Covers masts, derricks and accessories
Covers substructures and accessories,doesn't address much on carriers and ancillary devices for portable masts, i.e. carrier frame, tires, anchor points, work platform, guying.
The objective of this publication is to give guidelines and and establish recommended procedures for inspection, maintenance and repair of items for drilling and well servicing structures, in order to maintain the serviceability of this equipment.

Four Inspection Levels:
Cat I is DAILY (no documentation required)
Cat II is at rig- up (no documentation required)
Cat III every 730 operating days (documentation required)- Call us for Quote 
Cat IV every 3650 operating days- Call us for Quote 

Category III Inspections 
  • A thorough visual inspection of all load bearing components and members should be conducted to determine the condition of the mast/derrick and substructure and documented on the checklist in Annex A, Annex B, Annex C, or Annex D as applicable. 
  • The completed (and signed) checklist, as well as any major repairs completed, are to be documented in the permanent rig file. Inspections on well servicing, truck or trailer mounted masts should include observation of rig up/rig down operations.

Category IV Inspections 
  • A Category III inspection, plus the equipment is to be disassembled and cleaned to the extent necessary to conduct NDT of all defined critical areas. An ultrasonic thickness test is recommended on all tubular style (or closed style)members to test for internal corrosion. 
  • Internal cameras, usually run on cable, may also be used to visually inspect for internal corrosion.
  • Any damage found during the inspection is defined as MAJOR, SECONDARY, or MINOR, on the following basis.
    • Major Damage—Significant geometrical distortion or structural damage to primary load carrying components including raising assembly, main legs, hinge points and crown.
    •  Secondary Damage—Damage or distortion to non-primary load carrying components.
    • Minor Damage—Damage or distortion to ancillary equipment, i.e. ladders, monkey board, walk-arounds, tong hangers, etc. 
    • All welds (100 %) shall be visually examined.All welds in critical areas shall be inspected using magnetic particle (MPI), liquid penetrant (PT) or ultrasonic testing(UT) in accordance with AWS D1.1. 
    • Welds on galvanized structures may require different inspection techniques and intervals. Cracks are generally identified through visual inspection on a galvanized mast/derrick.
  • API RP 7L- 
  • Covers
  • Rotary tables
  • Rotary bushings
  • Rotary slips
  • Rotary hoses
  • Slush pump components
  • Draw works components
  • Spiders
  • Manual tongs
  • Safety clamps

Four inspection levels:
Cat I is “fix it if it breaks”
Cat II is “fix it if it’s bent or broken”
Cat III is “take it apart and look at it before it breaks”- Call us for Quote 
Cat IV is “take it apart and conduct NDE on all load bearing parts before it breaks” -Call us for Quote 

Locations in   Houston, TX,   Brenham,TX   Odessa, TX                                    SERVICE ANYWHERE, ANYTIME

CONTACT US TODAY AT (432)-254-8617
We have a Professional Engineer that can help expedite your total Cat IV inspections for
complete API RP 4G Re-certification. We are a one stop shop for all of your 4G re-certifications.
Local or International  we have you covered.
Give us a call so we can show you how we can save you time and money on your next 4G Re-Certifications.
We can normally be on-site within 48 hours after arrangements are made.
International services available.
Contact us at (432) 254-8617
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