Geophysical Cables

Milspares has years of real-world experience designing and supplying the toughest, most dependable geophysical cables in the world. Our engineers have the technical knowledge to deliver cable that meets or exceeds your specifications no matter how harsh the environment.

• Electronic Multi-conductor Instrumentation Cables
• Special-Purpose Oil Rig Cables
• Seismic-Search Cables-Towed Arrays
• Marine Cable
• Mining Applications
• Outdoor Lighting
• Rough Construction
• Water & Oil Resistant
• UV Resistant

SEISMIC STANDARD PRODUCTS

CAPABILITIES

Cable Design

Any mix of:

• Insulated copper wires
• Coax
• Twisted pairs
• Subcables
• Optical fibers
• Tubing, hose, tension members metal or synthetic
• Jacket-embedded braid for crush/cut resistance

Conductor Wires

Any mix of:

• Regular annealed copper
• High-strength copper-alloys
• Copper-jacketed steel
• Extra-high strand counts

Wire Insulation

• Polypropylene
• HDPE
• LDPE
• Tefzel®
• TFE Teflon®
• FEP Teflon®
• PFA Teflon®
• PVC
• RoHS-compliant-PVC
• Silicone
• Polyurethane
• Polyolefin
• TPR®
• TPE
• Cross-linked XLPE
• XLPVC
• Double-insulated wires a specialty.
• Wet-immersion-tested insulations
• High IR insulations
• Striped or number-printed insulation

RFI-Shielding

• Braided wire shields
• One or more layers
• Over wires
• Cabled wire-bundle
• In copper
• Tinned copper
• Silver-plated copper
• Nickel-plated copper
• Conetic alloys
• Foil Shields with drain wire
• Using Alum./Polyester
• Copper/Polyester
• Copper foil
• Conetic
• Fernetic magnetic foils
• Combinations of the above layers to reduce EMP effects

Cable Jackets

• Polyurethane
• HDPE
• LDPE
• PVC
• Hytrel
• TPR®
• TPE
• RoHS-compliant PVC
• Belted (fully pressure-filled round) cable jackets
• Jackets with embedded re-enforcing braid for cut/crush resistance
• Double-Layer-Bonded Jackets. Multi-colored
• Ribbed or Splined jacket outer surface
• National's "Easy-Drag" splined-surface cable jackets a specialty

Cable-Forming

• Many cablers, of many sizes
• Planetary cable forming
• Unilay single-direction forming, all layers
• Planetary cable forming
• Contra-helical alternating direction each layer
• Specialty: Patented close-balance pair twisting for digital signaling
• Pair, Trio, Quad, Quint, Sub-cabling for maximized flexing lifetime

Cable-Interstice-Filling

• Vistanex®
• WaterGard®
• DPR
• SecretSauce

Subcable Components

• Familiarity with API-17E Umbilical cable components

SEISMIC STANDARD PRODUCTS

D-2436 TWINAX (Bottom Telemetry): shielded twisted pair cables with 135-ohm controlled impedance, for digital signal use, one of our specialties: National is recognized in the seismic industry for our trouble-free D2436/D2440 Twinax using our proprietary "Self-Healing Dielectric" in our "Industry Standard Twinax" widely used to carry digital telemetry in ocean-bottom seismic-search cables.

Colors: This cable product is available with a choice of colors for the outer jacket. The part number to specify a given color is shown below.

D-2520 Preferred Seismic Towed Streamer Telemetry Twisted Pair
(unshielded)

D-2520 Streamer Telemetry pair presents a low-loss 135-ohm impedance when oil-immersed in Kerosene, or Niroma. This product has been tested and qualified for use with Sercel/Syntron digital marine repeaters. Widely used in US-made original-equipment towed streamer cables. A preferred rugged replacement telemetry pair for use with Sercel/Syntron digital marine repeaters.

Color Code: This cable is available with a choice of colors for the two paired wires. The part number suffix (-X) shown below is used to specify a given color combination. Colors will be pastel.