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Drill string conveying specifications

Complete Drill String Conveying Specifications (Tabular Format)

Model Series Overview

Model	Platform Height (m)	Max Pipe OD (in)	Max Joint Weight (kg)	Conveyor Length (m)	Drive Type
DSC-1.5	1.0 – 3.5	4.5	1,500	8 / 10	Hydraulic
DSC-2.0	3.5 – 4.5	7	2,000	10 / 12	Hydraulic / Electric
DSC-3.0	4.5 – 5.5	13.375	3,000	12 / 14	Hydraulic / Electric
DSC-5.0	5.5 – 6.5	20	5,000	14 / 16	Hydraulic (heavy-duty)
DSC-7.0	6.0 – 7.0	20	7,000	16 / 18	Hydraulic (dual cylinder)

Detailed Technical Parameters (DSC-3.0 Representative Model)

Parameter	Value
Pipe/rod OD range	2-3/8″ – 13-3/8″ (61mm – 340mm)
Sucker rod range	5/8″, 7/8″, 1″, 1-1/2″
Drill collar / HWDP range	3-1/2″ – 11″
Single joint length	6 – 13.5 m (Range 2 & Range 3)
Max conveying speed	0.5 m/s (adjustable)
Catwalk inclination	15° – 35° (adjustable, ±5° from nominal)
V-door tilt angle	0° – 90° (fully vertical possible)
Skid arm lift force	40 kN (4,000 kg) at 20 MPa
Conveyor drive chain	Double-strand roller chain, 1″ pitch
Chain wear life	5,000 hours typical
Hydraulic pressure	20 MPa (2,900 psi)
Hydraulic flow required	35.5 L/min (9.4 gpm)
Power pack (if dedicated)	11.5 kW (15 HP) electric motor, 380V/50Hz
Control voltage	24V DC
PLC brand	Siemens S7-1200 (standard)
Remote control range	50 meters (line-of-sight), 2.4 GHz
Operating temperature (standard)	-20°C to +50°C
Operating temperature (arctic)	-45°C to +45°C (with winterization kit)
Protection class	IP54 (control cabinet), IP65 (sensors)
Dimensions (L×W×H) – catwalk only	12,000 × 1,500 × 1,450 mm (customizable)
Total weight (complete system)	4,200 kg (catwalk) + 800 kg (HPU + controls)
Foundation requirements	200 mm reinforced concrete or rig substructure beam
Certifications	API 8C / ISO 9001 / CE / GOST optional
Warranty	18 months from shipment or 12 months from commissioning

Hydraulic Power Unit (HPU) Specifications (Dedicated Option)

Parameter	Value
Electric motor power	11.5 kW (15 HP), 4-pole
Voltage / frequency	380V/50Hz (custom: 460V/60Hz)
Hydraulic pump type	Gear pump, fixed displacement
Pump flow	35.5 L/min @ 20 MPa
Tank capacity	120 liters
Cooling	Air/oil cooler (2.5 kW)
Filtration	10 μm return line filter
Fluid type	ISO VG 46 (standard) or fire-resistant fluid (offshore)
Weight (dry)	380 kg
Dimensions (L×W×H)	1,200 × 800 × 1,100 mm

Control Console Specifications

Parameter	Value
Local panel	7″ touchscreen HMI + joystick + emergency stop
Remote pendant	Wired (15m cable) or wireless (50m)
Wireless frequency	2.4 GHz, 100 mW, 16 channels
Battery life (wireless)	20 hours continuous
Displayed parameters	Conveyor position, skid arm angle, hydraulic pressure, alarm history
Diagnostic interface	Ethernet (Modbus TCP), USB for data export

Application Fields & Suitable Models

Application	Rig Type	Platform Height	Recommended Model	Notes
Workover / light drilling	Truck-mounted, small land rig	1.0 – 3.0 m	DSC-1.5	Short catwalk, light pipe
Conventional land drilling	ZJ30 – ZJ50	3.5 – 5.0 m	DSC-2.0 or DSC-3.0	Most common selection
Deep / heavy land drilling	ZJ70 – ZJ90	5.0 – 6.5 m	DSC-5.0	Heavy casing & collars
Super-heavy / ultra-deep	ZJ90 – ZJ120	6.0 – 7.0 m	DSC-7.0	Dual lift cylinders
Offshore platform	Jack-up, fixed platform	4.0 – 6.0 m	DSC-3.0 or DSC-5.0 (offshore version)	Marine coating, Ex-rated
Arctic / low temperature	Any land rig	Any	Any model + winterization kit	Heated hydraulics, -45°C

Product Types – Complete Model Range

Series	Platform Height Range	Pipe OD Max (in)	Joint Weight Max (kg)	Conveyor Length (m)	Typical Use
DSC-1.5-A	1.0 – 2.5 m	4.5	1,500	8	Small workover
DSC-1.5-B	2.5 – 3.5 m	4.5	1,500	10	Workover, shallow drilling
DSC-2.0-A	3.5 – 4.0 m	7	2,000	10	Light land rigs (ZJ30)
DSC-2.0-B	4.0 – 4.5 m	7	2,000	12	ZJ40 rigs
DSC-3.0-A	4.5 – 5.0 m	13.375	3,000	12	ZJ50 rigs (most popular)
DSC-3.0-B	5.0 – 5.5 m	13.375	3,000	14	ZJ70 rigs
DSC-5.0-A	5.5 – 6.0 m	20	5,000	14	Heavy drilling (ZJ90)
DSC-5.0-B	6.0 – 6.5 m	20	5,000	16	ZJ90 with large casing
DSC-7.0	6.0 – 7.0 m	20	7,000	18	ZJ120 ultra-deep

Notes:

"-A” and "-B” indicate different conveyor lengths; all other specifications identical.
Each model can be ordered with: standard hydraulic (shared rig HPU), dedicated HPU, or electric drive.
Offshore version: suffix "-OS” – adds marine coating, stainless steel fasteners, Ex-rated electricals.
Arctic version: suffix "-AR” – adds heated hydraulic tank, cold-weather seals, -45°C hoses.

Why Choose SJ Petro Based on These Specifications?

1. We Don't Just Give Numbers – We Guarantee Them

Every specification in this document is validated by:

Factory load testing (to 125% of rated capacity)
Third-party witnessed inspections (SGS, BV, DNV upon request)
Field data from 150+ operating units

If a delivered unit fails to meet the stated specifications, we will correct it at our cost.

2. Modular Design – Easy to Fit, Easy to Upgrade

Our catwalk lengths and angles are adjustable during installation. If you later raise your substructure or change pipe sizes, we can supply extension sections or new V-groove inserts – no need to replace the entire system.

3. Full Documentation Package

Every system ships with:

Certified dimension drawing (as-built)
Hydraulic schematic
Electrical wiring diagram
PLC program backup
Spare parts list with OEM part numbers
3D model (STEP format) for layout planning

4. Global Compliance – API, ISO, CE, GOST

We can supply systems certified to your regional standards:

API 8C – Drilling and well servicing equipment
CE – For European Union
GOST / EAC – For Russia & Customs Union
ABS / DNV – For offshore (class approval)

5. Built to Last – Field Data on Wear Life

Based on fleet data from Sinopec’s Fuling shale gas field:

Chain life: 5,000 – 6,000 operating hours (replacement cost ~$800)
Hydraulic cylinder seals: 8,000 hours
Slider wear strips: 4,000 hours (reversible, $200 set)
PLC & sensors: >20,000 hours MTBF

6. Backed by Sinopec – The Ultimate Reference

Our equipment has been used to handle millions of pipe joints without a single conveyor-related dropped-object incident. That’s not just a spec – it's a track record.

FAQ – Drill String Conveying Specifications

Q1: What is the minimum and maximum pipe OD the system can handle without changeover parts?

A: Standard models handle 2-3/8″ to 13-3/8″ without any manual change of V-grooves or guides. For 16″ to 20″ casing, we provide quick-change inserts (15 minutes to swap). For 1.9″ tubing or sucker rods, an optional smaller V-groove insert is available.

Q2: How accurate is the platform height specification? Can I use the system if my rig floor is 5.2m but the model says max 5.0m?

A: The height ranges are conservative. A DSC-3.0 rated for 5.0m can safely handle 5.2m with reduced conveyor angle (e.g., 32° instead of 35°). However, for optimal performance and safety margin, we recommend moving to the next model if your platform height exceeds the rated maximum by more than 0.3m.

Q3: What hydraulic oil type and viscosity is required?

A: Standard: ISO VG 46 (mineral oil). For arctic: ISO VG 32 synthetic. For offshore / fire-risk: HFD (phosphate ester) or water-glycol. The system seals are compatible with all common hydraulic fluids – please specify your fluid type when ordering so we can supply correct seal material.

Q4: Can the system be operated in manual mode if the PLC fails?

A: Yes. A manual override valve block allows emergency operation of all cylinders and the conveyor motor using a hand pump or alternative hydraulic source. Full manual operation is slower but allows you to finish the shift while repairs are arranged.

Q5: What is the typical noise level during operation?

A: Hydraulic power unit (dedicated HPU) produces 75 dBA at 1 meter. The catwalk itself (chains and rollers) adds ~70 dBA. With the HPU placed behind a barrier or inside a doghouse, noise at the driller's position is typically below 80 dBA.

Q6: Do you provide a 3D CAD model for layout planning?

A: Yes. Upon request, we provide a STEP or IGES model of the complete system (catwalk, HPU, control cabinet) with all dimensions and mounting points. This allows you to integrate the system into your rig layout before ordering.

Q7: What are the power requirements for the electric drive option?

A: Electric drive (instead of hydraulic) uses an AC motor with VFD directly driving the conveyor chain. Power requirement: 11.5 kW (380-460V, 50/60 Hz). No hydraulic HPU needed. However, the skid arm still requires a small hydraulic power pack (1.5 kW) for tilting. We recommend the hydraulic version for most applications unless you have strict emission or noise limits.

Q8: What documentation do you provide for API 8C certification?

A: For API 8C monogrammed systems, we provide: