Welcome to the Mirage Machines Portable Performance Blog

In Focus: VHT gate valve drilling machines

Posted by Alan Hillier on Feb 15, 2018 11:04:00 AM


    

 VHT-SERIES-WELLHEADS.png

The VHT series of machines has been designed for wellhead machining applications, such as when gate valves are seized. When this happens, one solution is to fit a new valve on top of the defective one and to machine a hole through the seized slab gate, allowing the product to flow through.

Overview of the VHT Series

The products designed to solve the above problem is a range different sized machines based on the tried and trusted ‘CHT’ high pressure hot tapping machines. In reality, these aren’t ‘true’ hot tapping machines. Essentially, they are a drilling solution, but delivering the same advantages as the CHT range, including the resilience to withstand high pressures up to 5,000 psi and temperatures up to 230⁰c.

Stroke

An essential feature for a valve hot tapping/drilling machine is to ensure sufficient stroke to reach the slab valve through the wellhead assembly. Mirage offer 5 machine variants; from the VHT965 which has a maximum stroke from 38”, to the VHT4000 which provides a maximum stroke of 160”

The drive

The drive that powers the cutter provides high torque transfer and smooth power delivery. The drive unit is positioned close to cutter and the resulting reduction in bar torque gives a smoother cut.

Feed

The machine incorporates an auto-feed gearbox and motor with variable feed and manual traverse feature. The manual feed rate delivers 3mm (0.118”) per revolution.

Managing pressure

Internal pressure is managed using a balanced system which reduces mechanical shocks and forces when operating at high pressures. The machine also uses constant seal and pressure monitoring, ensuring any pressure leaks can be monitored and contained whilst the machine is in use.

Measuring depth of the cut

The VHT series uses a geared mechanical depth display, providing a much easier solution that reliance on measuring rods. An LCD display can be provided as an option if preferred.

Related resources

 

Download the Mirage Machines Hot Tapping and Line Stopping Buyers Guide

 

Topics: hot tapping, valves, drilling, master valve

   

SUBSCRIBE VIA E-MAIL

Flange Facing On-Site Machining Case Studies - Mirage Machines
See-mirage-range-of-on-site-machining-products

LATEST POSTS