Offshore Operators are now specifying Integral Side Entry Subs manufactured from one piece of steel for critical wells.

Sub-drill Flanged Side Entry Sub is the answer:

The flanged side entry connection can be replaced easily if damaged

Avoids the welding and stress relief problems with 4145 H Mod steel of fabricated subs

Reduced initial purchase cost compared to integral designs

Compact flange design

Large ID versions available

Tensile loading charts available for all sizes

Finite Analysis carried out to ensure reliability and good service life

Double Side Entry Sub version available (also known as a Double Dutch Sub)


DNV design ABS design
Sub-Drill / DNV and ABS design verification


Flanged Side Entry Sub

Flanged Sub