- Static brake capacity test for all brakes operating simultaneously at 2 times SWL.

- Static brake capacity test for each individual brake at 1.8 times SWL.

- Dynamic brake capacity test for each individual brake at 1.25 times SWL.

(iii) Other load bearing components are to comply with applicable recognized standards.

(C) Functional tests

(a) All the equipment is to be subject to functional tests in accordance with applicable rec- ognized standards.

(b) Well control equipment is to be tested as the following.

(i) Drift test is to be carried out in accordance with API Spec 16A 7.5.8.4.

(ii) Shear ram test to verify shear capacity is to be carried out in accordance with Ch 4, 202. and API Spec 16A 7.5.8.7.4.

4. Onboard test

(1) Onboard installation tests of all drilling systems are to be verified by the Surveyor and are to be in accordance with the Society agreed test procedures. The following surveys are to be car- ried out in attendance of the Surveyor.

(A) Piping systems are to be visually examined, nondestructively examined and pressure-tested in accordance with Ch 2 of the Rules or applicable API standards.

(B) Pressure tests conducted on Group I piping systems as specified in Pt 5, Ch 6 of Rules for the Classification of Steel Ships are to be preferably recorded on test charts for the duration of their tests. Minimum time for holding pressure is to be 15 minutes.

(C) All pressure relief and safety valves are to be tested.

(D) Installed choke and kill systems are to be pressure-tested at rated working pressure and also subjected to a low-pressure test at 2.07 MPa. performance tests are to be carried out.

24 Guidance Relating to the Rules for the Classification of Mobile Offshore Drilling Units 2015

(E) Assembly and installation of drilling derrick is to be examined, to include erection of der- rick structure, welding and bolt torqueing, water table, crown block and turn-over sheaves assembly, guide rails for hoisting equipment, derrick mounted equipment and outfitting items, installation and pressure testing of drilling and related piping systems, overall dimensional control, and final alignment and bolting on the drill floor/substructure foundations.

(F) Mud pump operational test is to be carried out.

(G) Derrick

(a) Assembled and installed derrick is to be visually examined, including welding and bolt- ing, torqueing, its water table, crown block and turnover sheaves assembly, guide rails for hoisting equipment, derrick mounted equipment, and outfitting items.

(b) Derrick dimensional control, final alignment and bolting on the drill floor/substructure foundations are to comply with manufacturer's specifications and tolerances.

(c) load test of the derrick structure is not required unless specified in the client's purchase

order specification.

(H) Drawwork

(a) As a minimum, the following tests are to be performed for all drawwork brakes in ac- cordance with the Society-approved test specifications.

(i) Rotational check: Verify rotation for both directions.

(ii) Rotational test: 100% rated drum/motor speed in both directions for a period of at least five minutes. With minimum delay between operations, repeat this step three times or in accordance with manufacturer's specifications. Bearing temperature for motor, gearbox and drum are to be monitored and recorded.

(iii)Brake burnishing test: Burnishing test is to be performed for the primary brake with consideration to brake clamping force, drum speed, RPM, or motor speed. Temperature at calipers and motor are to be monitored and recorded. The burnishing

results such as percentage of lining contact, bright surface, etc. and verification of

"gapping", the distance between the brakes and the brake discs, is to be performed. (iv)Brake verification: After the brake burnishing test, individual verification of each

caliper is to be performed under drum/motor load. Motor amperage and voltage, hy-

draulic pressure, and loads, as applicable, associated with caliper slippage are to be monitored and recorded. Each caliper must demonstrate adequate capacity as

designed.

(v) Dynamic brake holding test is to be performed at 100% rated load for a period of

at least 5 minutes for the primary brake. This test is to include the following:

- Drawwork is to stop its rotation within the timeframe as specified in the ap- proved manufacturer's specifications, including the specified applied voltage and amperage

- Monitor and confirm brake holding capability including the caliper pressure, as specified in the approved manufacturer's specification.

- Monitor and record caliper pressure, temperature, and fluid flow.

- Visual inspection of brakes and hydraulic leakage are to be performed.

- This test may be carried out by using a reduced number of lines with corre- sponding rated load and in accordance with the drawworks approved manufactur- er's testing procedures.

(vi) Emergency brake test is to be performed to simulate loss of hydraulic supply or primary brake failure and verify hydraulic, or air release spring set is functional.

This test is to be performed at 100% rated load.

(vii) Electromagnetic braking system tests are to be performed for compliance with ap- proved manufacturer's specifications. Additional provisions of the drawworks electro-

magnetic braking system are provided in Ch 4, 603. 2.

(b) On self-elevating units, deflection testing of the cantilever may also qualify as the static and structural testing of drawworks.

(c) On column-stabilized or surface type units, where a full rated load test may constitute increased risk or a safety concern to the unit or personnel, alternative testing methods such as load testing at a reduced number of lines with corresponding rated load may be considered on a case-by-case basis. Request for such consideration is to be submitted to the Society and agreed upon prior to commencement of the test.