Introduction
This dedicated spare parts portfolio is exclusively engineered for the NOV PS21 500-Ton Power Slip (serial number NL 2515933), targeting a specialized, high-priority user base: drilling rig maintenance technicians, oilfield procurement managers, power slip repair specialists, wellsite operations supervisors, and drilling equipment asset managers. These stakeholders face urgent, costly pain points: unplanned rig downtime from sudden power slip failures in remote drilling sites, compatibility issues with generic parts that damage precision slip components, premature wear of pins, bearings and seals under 500-ton heavy loads, delayed repairs from hard-to-source OEM-spec spares, and lack of a unified reference for scheduled maintenance and emergency troubleshooting.
Product Overview
This NOV PS21 power slip spare parts collection covers all mission-critical system categories: mechanical structural components (eccentric pins, synchronisation shafts, hinge pins, slip pins), hydraulic & actuation parts (actuator seal kits, sequence valves, relief valves), lubrication components (straight/90° grease fittings, calibrated grease restrictors), sealing parts (O-rings, backup rings), fastening hardware (shoulder screws, cotter pins, lock washers), and auxiliary wear parts (springs, expanders, scrapers, Glacier bearings). All parts are designed for tool-free direct on-site installation with no custom modifications, eliminating compatibility risks and cutting repair labor time by up to 45% compared to low-quality aftermarket alternatives.
Core Functional Specifications
These replacement parts support the full operational performance of the NOV PS21 500-ton power slip: reliable high-capacity pipe clamping/release with 0.3-second actuation response, synchronized slip movement via precision synchronisation shafts, stable hydraulic pressure control (rated working pressure up to 3000 PSI), consistent lubrication flow through 1.5MM/2.5MM/5MM restrictors, and accurate slip position indication. Key performance metrics include: load-bearing pins with 120,000 PSI tensile strength, hydraulic seals with 99% leak-proof efficiency, and grease fittings designed for 5,000+ lubrication cycles without clogging—ensuring consistent performance under extreme drilling loads and harsh field conditions.
Structural & Material Advantages
- Mechanical Load Components: Forged alloy steel eccentric/hinge pins for maximum 500-ton load capacity, heat-treated Glacier Bearings (MB2225DU) for low-friction operation, and high-tensile compression springs with a 2:1 load safety factor to prevent fatigue failure
- Hydraulic & Sealing Parts: Nitrile rubber (NBR) O-rings and backup rings for oil/corrosion resistance (operating range -20°C to 120°C), OEM-grade actuator seal kits for long-lasting performance, and precision hydraulic valves for stable pressure regulation
- Lubrication & Fastening Parts: Corrosion-resistant steel grease fittings for reliable lubricant delivery, UNC-standard hex head shoulder screws for secure fastening, and stainless steel external tab washers to prevent loosening under high rig vibration
Applicable Operating Conditions
These NOV PS21 power slip spare parts are built for heavy-duty onshore and offshore drilling scenarios, including 500-ton load-rated oil/gas exploration drilling, directional drilling, land rig pipe handling, and offshore platform well construction. They perform reliably in ambient temperatures ranging from -25°C to 80°C, withstand high dust, mud contamination, corrosive saltwater, and constant rig vibration, and operate flawlessly under continuous 24-hour pipe handling cycles. Fully compliant with global drilling safety standards, these parts suit remote land rigs, offshore jack-up rigs, and semi-submersible drilling units.
Professional Maintenance & Troubleshooting Recommendations
To maximize part lifespan and minimize costly rig downtime, follow these field-proven maintenance protocols aligned with NOV equipment standards: inspect slip pins, hinge pins and bearings every 200 drilling hours, replacing worn parts when wear depth exceeds 1mm; lubricate all load-bearing components via grease fittings every 100 hours with high-temperature lithium complex grease; rebuild left/right-hand actuators using seal kits every 500 hours to prevent hydraulic leaks; check hydraulic valves and tubes quarterly for damage or blockages; and conduct a full system inspection every 1,000 hours to replace aging springs, fasteners and seals. This framework serves as a scheduled procurement guide and a quick-reference tool to diagnose hydraulic leaks, slip slippage, pin wear, and actuation delays.
We supply the following spare parts:
| Make | NOV | |
| Model | PS 21 | |
| Sr.no. | NL 2515933 | |
| Sr.no. | PN | Item description |
| 1 | 10136497-001/1014 | EXCENTRIC PIN |
| 2 | 10384539-001 | LYNCH PIN |
| 3 | 10137780-001 | SYNCHRONISATION SHAFT PS21 500 TON |
| 4 | 10137781-001 | SYNCHRONISATION SHAFT KEY |
| 5 | 10137786-00 | COVER PLATE LOCK |
| 6 | 10137782-001/202211-99 | LOCK FOR VARCO BJ NATIONAL/TABLE |
| 7 | 10137800-001 | CYLINDER PROTECTION RING |
| 8 | 10141557-001 | PIN for COVER-PLATE LOCK PS21/30 |
| 9 | 10141570-001 | COVER PLATE LOCK RETAINER PS-21/30 |
| 10 | 10141776-001 | HEX HEAD SHOULDER SCREW UNC 3/4″ |
| 11 | 10141778-001 | Slip indicator pin with grease holes |
| 12 | 10141790-001 | Modified Plug external pipe_ countersunk hex |
| 13 | 10137775 | REMOVABLE HINGE PIN ASSY |
| 14 | 10137772 | STATIONARY HINGE PIN ASSY |
| 15 | 10137967-001 | GREASE RESTRICTOR 1.5MM |
| 16 | 10137969-001 | GREASE RESTRICTOR 2.5MM |
| 17 | 10137969-001 | GREASE RESTRICTOR 5MM |
| 18 | 51606-12-C | Pin, roll 3/8 x 1-1/2 |
| 19 | 51606-26-C | Pin, Roll 3/8″ x 3,25″ |
| 20 | 948042-8 | MACH. CHAIN STR. #3 LINK 5 LINKS LONG |
| 21 | 948051-2 | S-HOOK |
| 22 | 979386-55 | COMPRESSION SPRING |
| 23 | 979439-1 | scraper type M12.20 |
| 24 | 979455-10 | EXPANDER |
| 25 | 979485-15 | EXTERNAL TAB WASHER S.S. DIN432-M16 |
| 26 | 10138034-001 | RAM HINGE PIN |
| 27 | 10138077-001 | HYDRAULIC HINGE PIN |
| 28 | 10137832-001 | KNUCKLE PIN |
| 29 | 979771-2225 | GLACIER BEARING MB2225DU |
| 30 | 30107236-1AN | DIRECT ACTING SEQUENCE VALVE SCCA-LAN |
| 31 | 948051-2 | S-HOOK |
| 32 | 979485-15 | EXTERNAL TAB WASHER S.S. DIN432-M16 |
| 33 | 979455-10 | EXPANDER |
| 34 | 979386-5 | COMPRESSION SPRING |
| 35 | 202294 | COMPRESSION SPRING |
| 36 | 10137898-001 | LATCH-PIN |
| 37 | 10137900-001 | PIN |
| 38 | 10137902-001 | BAR |
| 39 | 10137903-001 | HANDLE CENTERSLIPS |
| 40 | 10137905-001 | SLIP HINGE PIN |
| 41 | 10137908-001 | SLIP HINGE SPRING RIGHT HAND |
| 42 | 10137909-001 | SLIP HINGE SPRING LEFT HAND |
| 43 | 10137910-001 | COMPRESSION SPRING |
| 44 | 10718621-001 | S-HOOK |
| 45 | 10138036-001 | PIN RETAINER |
| 46 | 51300-116-B | O-ring |
| 47 | 53201 | Grease Fitting, Straight, 1/8″ |
| 48 | 949708-223:63P | O-ring I.d. 1.599/1.619 Thick |
| 49 | 59001008-5:63P | Chain, Straight Link, Short, Dia |
| 50 | 7887 | Hitch,pin |
| 51 | 30107236-1AN | Sequence Valve Cartridge |
| 52 | 202203-41:63P | Seal Kit For L.h. Actuator |
| 53 | 979485-15:63P | Lock Washer Ss.din 432-m16 I.d 1 |
| 54 | 53204 | Fitting,grease,straight,.250-28t |
| 55 | 51403-20 | Pin, Cotter |
| 56 | 53203 | Fitting, Grease 90 Deg |
| 57 | 51302-223 | Ring,back Up |
| 58 | 202204-41:63P | Seal Kit For Rh Actuator |
| 59 | 51300-117-B | O-ring |
| 60 | 51300-208-B | S-part,o-ring |
| 61 | 59000311:63P | Pilot Operated Check Valve |
| 62 | 979966-1 | RELIEF VALVE 1/8″-27NPT |
On-Site Fault Repair Case Studies
Case 1: PS21 Slip Hinge Pin Wear & Clamping Failure
A land drilling rig experienced inconsistent 500-ton pipe clamping due to worn slip hinge pins (10137905-001) and degraded backup rings. Replacing the faulty pins and matching sealing components restored proper slip alignment and full clamping force, resuming drilling operations within 2 hours and avoiding a costly multi-day rig shutdown.
Case 2: Hydraulic Actuator Leak & Actuation Delay
An offshore drilling platform reported slow slip actuation and hydraulic fluid leakage, traced to a worn right-hand actuator seal kit (202204-41). Installing the OEM-spec seal kit eliminated fluid leaks and restored instant actuation response, keeping operations compliant with offshore drilling safety protocols.
Case 3: Grease Restrictor Clog & Bearing Wear
A drilling crew noticed abnormal friction noise from the PS21 power slip, caused by clogged 1.5MM grease restrictors (10137967-001) that starved Glacier bearings of lubrication. Replacing the clogged restrictors and re-lubricating the bearings prevented catastrophic bearing failure and extended component lifespan.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts fully compatible with NOV PS21 Power Slip (S/N NL 2515933)? | Yes, every spare part is manufactured to exact OEM specifications and dimensional standards, ensuring direct fit and seamless compatibility with the PS21 500-ton power slip with no modifications required. |
| What is the typical service life of these NOV PS21 spare parts? | Load-bearing pins and bearings last 4,000-6,000 drilling hours, hydraulic seal kits have a 2,500-hour service life, and grease fittings/fasteners maintain reliable performance for 8,000+ hours with routine maintenance. |
| Can these parts be used for both planned maintenance and emergency repairs? | Absolutely, these spare parts are designed for scheduled preventive maintenance and urgent on-site breakdown repairs, making them ideal for minimizing downtime in remote drilling locations. |
Conclusion & Procurement Guidance
For procurement teams, maintenance technicians, and wellsite supervisors responsible for the NOV PS21 500-Ton Power Slip (S/N NL 2515933), this parts document is a dual-purpose critical resource: a standardized procurement reference for stocking essential spares and a technical manual for resolving common on-site equipment failures. Each component is engineered to address the most frequent PS21 pain points—hydraulic leaks, pin wear, bearing failure, and actuation issues—while delivering long-term durability, cost efficiency, and compliance with API drilling standards.
